I had the same Error,
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
in my case the WAR had application.properties inside that pointed to development server
where external application.properties was pointing to the right DB server.
make sure you don't have any other application.properties in the classpath / jars...
I solved the error by modifying the following property in hibernate.cfg.xml
<property name="hibernate.hbm2ddl.auto">validate</property>
Earlier, the table was getting deleted each time I ran the program and now it doesnt, as hibernate only validates the schema and does not affect changes to it.
Interesting to note, all sources emphasize that @Column(nullable=false) is used only for DDL generation.
However, even if there is no @NotNull annotation, and hibernate.check_nullability option is set to true, Hibernate will perform validation of entities to be persisted.
It will throw PropertyValueException saying that "not-null property references a null or transient value", if nullable=false attributes do not have values, even if such restrictions are not implemented in the database layer.
More information about hibernate.check_nullability option is available here: http://docs.jboss.org/hibernate/orm/5.0/userguide/html_single/Hibernate_User_Guide.html#configurations-mapping.
The simplest and least verbose way to autowire your Hibernate SessionFactory is:
This is the solution for Spring Boot 1.x with Hibernate 4:
application.properties:
spring.jpa.properties.hibernate.current_session_context_class=
org.springframework.orm.hibernate4.SpringSessionContext
Configuration class:
@Bean
public HibernateJpaSessionFactoryBean sessionFactory() {
return new HibernateJpaSessionFactoryBean();
}
Then you can autowire the SessionFactory
in your services as usual:
@Autowired
private SessionFactory sessionFactory;
As of Spring Boot 1.5 with Hibernate 5, this is now the preferred way:
application.properties:
spring.jpa.properties.hibernate.current_session_context_class=
org.springframework.orm.hibernate5.SpringSessionContext
Configuration class:
@EnableAutoConfiguration
...
...
@Bean
public HibernateJpaSessionFactoryBean sessionFactory(EntityManagerFactory emf) {
HibernateJpaSessionFactoryBean fact = new HibernateJpaSessionFactoryBean();
fact.setEntityManagerFactory(emf);
return fact;
}
You entity is not correctly annotated, you must use the @javax.persistence.Entity
annotation. You can use the Hibernate extension @org.hibernate.annotations.Entity
to go beyond what JPA has to offer but the Hibernate annotation is not a replacement, it's a complement.
So change your code into:
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
public class Message {
...
}
I was getting this error even when all the relevant dependencies were in place because I hadn't created the schema in MySQL.
I thought it would be created automatically but it wasn't. Although the table itself will be created, you have to create the schema.
openSession
: When you call SessionFactory.openSession
, it always creates a new Session
object and give it to you.
You need to explicitly flush and close these session objects.
As session objects are not thread safe, you need to create one session object per request in multi-threaded environment and one session per request in web applications too.
getCurrentSession
: When you call SessionFactory.getCurrentSession
, it will provide you session object which is in hibernate context and managed by hibernate internally. It is bound to transaction scope.
When you call SessionFactory.getCurrentSession
, it creates a new Session
if it does not exist, otherwise use same session which is in current hibernate context. It automatically flushes and closes session when transaction ends, so you do not need to do it externally.
If you are using hibernate in single-threaded environment , you can use getCurrentSession
, as it is faster in performance as compared to creating a new session each time.
You need to add following property to hibernate.cfg.xml to use getCurrentSession
method:
<session-factory>
<!-- Put other elements here -->
<property name="hibernate.current_session_context_class">
thread
</property>
</session-factory>
My Spring Data JPA-based answer: I simply added a @Transactional
annotation to my outer method.
The child entity was immediately becoming detached because there was no active Hibernate Session context. Providing a Spring (Data JPA) transaction ensures a Hibernate Session is present.
https://vladmihalcea.com/a-beginners-guide-to-jpa-hibernate-entity-state-transitions/
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="empTable")
public class Employee implements Serializable{
private static final long serialVersionUID = 1L;
private int id;
private String empName;
List<Address> addList=new ArrayList<Address>();
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="emp_id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
@OneToMany(mappedBy="employee",cascade=CascadeType.ALL)
public List<Address> getAddList() {
return addList;
}
public void setAddList(List<Address> addList) {
this.addList = addList;
}
}
We have two entities Employee and Address with One to Many relationship.
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table(name="address")
public class Address implements Serializable{
private static final long serialVersionUID = 1L;
private int address_id;
private String address;
Employee employee;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
public int getAddress_id() {
return address_id;
}
public void setAddress_id(int address_id) {
this.address_id = address_id;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@ManyToOne
@JoinColumn(name="emp_id")
public Employee getEmployee() {
return employee;
}
public void setEmployee(Employee employee) {
this.employee = employee;
}
}
By this way we can implement inner join between two tables
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
public class Main {
public static void main(String[] args) {
saveEmployee();
retrieveEmployee();
}
private static void saveEmployee() {
Employee employee=new Employee();
Employee employee1=new Employee();
Employee employee2=new Employee();
Employee employee3=new Employee();
Address address=new Address();
Address address1=new Address();
Address address2=new Address();
Address address3=new Address();
address.setAddress("1485,Sector 42 b");
address1.setAddress("1485,Sector 42 c");
address2.setAddress("1485,Sector 42 d");
address3.setAddress("1485,Sector 42 a");
employee.setEmpName("Varun");
employee1.setEmpName("Krishan");
employee2.setEmpName("Aasif");
employee3.setEmpName("Dut");
address.setEmployee(employee);
address1.setEmployee(employee1);
address2.setEmployee(employee2);
address3.setEmployee(employee3);
employee.getAddList().add(address);
employee1.getAddList().add(address1);
employee2.getAddList().add(address2);
employee3.getAddList().add(address3);
Session session=HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
session.save(employee);
session.save(employee1);
session.save(employee2);
session.save(employee3);
session.getTransaction().commit();
session.close();
}
private static void retrieveEmployee() {
try{
String sqlQuery="select e from Employee e inner join e.addList";
Session session=HibernateUtil.getSessionFactory().openSession();
Query query=session.createQuery(sqlQuery);
List<Employee> list=query.list();
list.stream().forEach((p)->{System.out.println(p.getEmpName());});
session.close();
}catch(Exception e){
e.printStackTrace();
}
}
}
I have used Java 8 for loop for priting the names. Make sure you have jdk 1.8 with tomcat 8. Also add some more records for better understanding.
public class HibernateUtil {
private static SessionFactory sessionFactory ;
static {
Configuration configuration = new Configuration();
configuration.addAnnotatedClass(Employee.class);
configuration.addAnnotatedClass(Address.class);
configuration.setProperty("connection.driver_class","com.mysql.jdbc.Driver");
configuration.setProperty("hibernate.connection.url", "jdbc:mysql://localhost:3306/hibernate");
configuration.setProperty("hibernate.connection.username", "root");
configuration.setProperty("hibernate.connection.password", "root");
configuration.setProperty("dialect", "org.hibernate.dialect.MySQLDialect");
configuration.setProperty("hibernate.hbm2ddl.auto", "update");
configuration.setProperty("hibernate.show_sql", "true");
configuration.setProperty(" hibernate.connection.pool_size", "10");
// configuration
StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
sessionFactory = configuration.buildSessionFactory(builder.build());
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
What happens if I promote the column to be a/the PK, too (a.k.a. identifying relationship)? As the column is now the PK, I must tag it with @Id (...).
This enhanced support of derived identifiers is actually part of the new stuff in JPA 2.0 (see the section 2.4.1 Primary Keys Corresponding to Derived Identities in the JPA 2.0 specification), JPA 1.0 doesn't allow Id
on a OneToOne
or ManyToOne
. With JPA 1.0, you'd have to use PrimaryKeyJoinColumn
and also define a Basic
Id
mapping for the foreign key column.
Now the question is: are @Id + @JoinColumn the same as just @PrimaryKeyJoinColumn?
You can obtain a similar result but using an Id
on OneToOne
or ManyToOne
is much simpler and is the preferred way to map derived identifiers with JPA 2.0. PrimaryKeyJoinColumn
might still be used in a JOINED inheritance strategy. Below the relevant section from the JPA 2.0 specification:
11.1.40 PrimaryKeyJoinColumn Annotation
The
PrimaryKeyJoinColumn
annotation specifies a primary key column that is used as a foreign key to join to another table.The
PrimaryKeyJoinColumn
annotation is used to join the primary table of an entity subclass in theJOINED
mapping strategy to the primary table of its superclass; it is used within aSecondaryTable
annotation to join a secondary table to a primary table; and it may be used in aOneToOne
mapping in which the primary key of the referencing entity is used as a foreign key to the referenced entity[108]....
If no
PrimaryKeyJoinColumn
annotation is specified for a subclass in the JOINED mapping strategy, the foreign key columns are assumed to have the same names as the primary key columns of the primary table of the superclass....
Example: Customer and ValuedCustomer subclass
@Entity @Table(name="CUST") @Inheritance(strategy=JOINED) @DiscriminatorValue("CUST") public class Customer { ... } @Entity @Table(name="VCUST") @DiscriminatorValue("VCUST") @PrimaryKeyJoinColumn(name="CUST_ID") public class ValuedCustomer extends Customer { ... }
[108] The derived id mechanisms described in section 2.4.1.1 are now to be preferred over
PrimaryKeyJoinColumn
for the OneToOne mapping case.
This source http://weblogs.java.net/blog/felipegaucho/archive/2009/10/24/jpa-join-table-additional-state states that using @ManyToOne and @Id works with JPA 1.x. Who's correct now?
The author is using a pre release JPA 2.0 compliant version of EclipseLink (version 2.0.0-M7 at the time of the article) to write an article about JPA 1.0(!). This article is misleading, the author is using something that is NOT part of JPA 1.0.
For the record, support of Id
on OneToOne
and ManyToOne
has been added in EclipseLink 1.1 (see this message from James Sutherland, EclipseLink comitter and main contributor of the Java Persistence wiki book). But let me insist, this is NOT part of JPA 1.0.
Hibernate queries are case sensitive with property names (because they end up relying on getter/setter methods on the @Entity
).
Make sure you refer to the property as fileName
in the Criteria query, not filename
.
Specifically, Hibernate will call the getter method of the filename
property when executing that Criteria query, so it will look for a method called getFilename()
. But the property is called FileName
and the getter getFileName()
.
So, change the projection like so:
criteria.setProjection(Projections.property("fileName"));
Could be due to the TCP protocol turned off.
How to check/enable: https://dba.stackexchange.com/questions/11377/cannot-connect-to-ms-sql-2008-r2-by-dbvisualizer-native-sspi-library-not-loade/144097#144097
Check the unsaved values for your primary key/Object ID in your hbm files. If you have automated ID creation by hibernate framework and you are setting the ID somewhere it will throw this error.By default the unsaved value is 0, so if you set the ID to 0 you will see this error.
The annotation @JoinColumn
indicates that this entity is the owner of the relationship (that is: the corresponding table has a column with a foreign key to the referenced table), whereas the attribute mappedBy
indicates that the entity in this side is the inverse of the relationship, and the owner resides in the "other" entity. This also means that you can access the other table from the class which you've annotated with "mappedBy" (fully bidirectional relationship).
In particular, for the code in the question the correct annotations would look like this:
@Entity
public class Company {
@OneToMany(mappedBy = "company",
orphanRemoval = true,
fetch = FetchType.LAZY,
cascade = CascadeType.ALL)
private List<Branch> branches;
}
@Entity
public class Branch {
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "companyId")
private Company company;
}
mysql jdbc driver has already provide a convenient to meet this requirement, you must at least the have the jar version >= mysql-connect-jar-5.1.6.jar
step 1: [configure your jdbc.url to add logger and custom logging]
jdbc.url=jdbc:mysql://host:port/your_db?logger=com.mysql.jdbc.log.Slf4JLogger&profileSQL=true&profilerEventHandler=com.xxx.CustomLoggingProfilerEventHandler
now, it is using slf4j logging, if your default logging is log4j, you must add slf4j-api, slf4j-log4j12 dependencies to use slf4j logging
step 2: [write your custom logging]
package com.xxx;
import java.sql.SQLException;
import java.util.Properties;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.log.Log;
public class CustomLoggingProfilerEventHandler implements ProfilerEventHandler {
private Log log;
public LoggingProfilerEventHandler() {
}
public void consumeEvent(ProfilerEvent evt) {
/**
* you can only print the sql as this.log.logInfo(evt.getMessage())
* you can adjust your sql print log level with: DEBUG,INFO
* you can also handle the message to meet your requirement
*/
this.log.logInfo(evt);
}
public void destroy() {
this.log = null;
}
public void init(Connection conn, Properties props) throws SQLException {
this.log = conn.getLog();
}
}
// SQL: SELECT * FROM table LIMIT start, maxRows;
Query q = session.createQuery("FROM table");
q.setFirstResult(start);
q.setMaxResults(maxRows);
I found the problem that was causing the HTTP error.
In the setFalse()
function that is triggered by the Save button my code was trying to submit the form that contained the button.
function setFalse(){
document.getElementById("hasId").value ="false";
document.deliveryForm.submit();
document.submitForm.submit();
when I remove the document.submitForm.submit();
it works:
function setFalse(){
document.getElementById("hasId").value ="false";
document.deliveryForm.submit()
@Roger Lindsjö Thank you for spotting my error where I wasn't passing on the right parameter!
We have a tomcat-8.5 + restlet-2.3.4 + hibernate-4.2.0 + log4j-1.2.14 java 8 app running on AlpineLinux in docker.
On adding these 2 lines to /usr/local/tomcat/webapps/ROOT/WEB-INF/classes/log4j.properties, I started seeing the HQL queries in the logs:
### log just the SQL
log4j.logger.org.hibernate.SQL=debug
### log JDBC bind parameters ###
log4j.logger.org.hibernate.type=debug
However, the JDBC bind parameters are not being logged.
A small improvement to @FishBoy's suggestion is to use the id projection, so you don't have to hard-code the identifier property name.
criteria.setProjection(Projections.distinct(Projections.id()));
I agree with Vladimir. The administrators in my company would definitely not appreciate it if I even suggested such a course.
Further, creating an SQL script in stead of blindly trusting Hibernate gives you the opportunity to remove fields which are no longer in use. Hibernate does not do that.
And I find comparing the production schema with the new schema gives you even better insight to wat you changed in the data model. You know, of course, because you made it, but now you see all the changes in one go. Even the ones which make you go like "What the heck?!".
There are tools which can make a schema delta for you, so it isn't even hard work. And then you know exactly what's going to happen.
You need to use @EmbeddedId
:
@Entity
class Time {
@EmbeddedId
TimeId id;
String src;
String dst;
Integer distance;
Integer price;
}
@Embeddable
class TimeId implements Serializable {
Integer levelStation;
Integer confPathID;
}
Dialect is the SQL dialect that your database uses.
List of SQL dialects for Hibernate.
Either provide it in hibernate.cfg.xml as :
<hibernate-configuration>
<session-factory name="session-factory">
<property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>
...
</session-factory>
</hibernate-configuration>
or in the properties file as :
hibernate.dialect=org.hibernate.dialect.SQLServerDialect
You need to download log4j and add in your classpath.
You can use JPQL as well as JPA Criteria API for any kind of DTO projection(Mapping only selected columns to a DTO class) . Look at below code snippets showing how to selectively select various columns instead of selecting all columns . These example also show how to select various columns from joining multiple columns . I hope this helps .
JPQL code :
String dtoProjection = "new com.katariasoft.technologies.jpaHibernate.college.data.dto.InstructorDto"
+ "(i.id, i.name, i.fatherName, i.address, id.proofNo, "
+ " v.vehicleNumber, v.vechicleType, s.name, s.fatherName, "
+ " si.name, sv.vehicleNumber , svd.name) ";
List<InstructorDto> instructors = queryExecutor.fetchListForJpqlQuery(
"select " + dtoProjection + " from Instructor i " + " join i.idProof id " + " join i.vehicles v "
+ " join i.students s " + " join s.instructors si " + " join s.vehicles sv "
+ " join sv.documents svd " + " where i.id > :id and svd.name in (:names) "
+ " order by i.id , id.proofNo , v.vehicleNumber , si.name , sv.vehicleNumber , svd.name ",
CollectionUtils.mapOf("id", 2, "names", Arrays.asList("1", "2")), InstructorDto.class);
if (Objects.nonNull(instructors))
instructors.forEach(i -> i.setName("Latest Update"));
DataPrinters.listDataPrinter.accept(instructors);
JPA Criteria API code :
@Test
public void fetchFullDataWithCriteria() {
CriteriaBuilder cb = criteriaUtils.criteriaBuilder();
CriteriaQuery<InstructorDto> cq = cb.createQuery(InstructorDto.class);
// prepare from expressions
Root<Instructor> root = cq.from(Instructor.class);
Join<Instructor, IdProof> insIdProofJoin = root.join(Instructor_.idProof);
Join<Instructor, Vehicle> insVehicleJoin = root.join(Instructor_.vehicles);
Join<Instructor, Student> insStudentJoin = root.join(Instructor_.students);
Join<Student, Instructor> studentInsJoin = insStudentJoin.join(Student_.instructors);
Join<Student, Vehicle> studentVehicleJoin = insStudentJoin.join(Student_.vehicles);
Join<Vehicle, Document> vehicleDocumentJoin = studentVehicleJoin.join(Vehicle_.documents);
// prepare select expressions.
CompoundSelection<InstructorDto> selection = cb.construct(InstructorDto.class, root.get(Instructor_.id),
root.get(Instructor_.name), root.get(Instructor_.fatherName), root.get(Instructor_.address),
insIdProofJoin.get(IdProof_.proofNo), insVehicleJoin.get(Vehicle_.vehicleNumber),
insVehicleJoin.get(Vehicle_.vechicleType), insStudentJoin.get(Student_.name),
insStudentJoin.get(Student_.fatherName), studentInsJoin.get(Instructor_.name),
studentVehicleJoin.get(Vehicle_.vehicleNumber), vehicleDocumentJoin.get(Document_.name));
// prepare where expressions.
Predicate instructorIdGreaterThan = cb.greaterThan(root.get(Instructor_.id), 2);
Predicate documentNameIn = cb.in(vehicleDocumentJoin.get(Document_.name)).value("1").value("2");
Predicate where = cb.and(instructorIdGreaterThan, documentNameIn);
// prepare orderBy expressions.
List<Order> orderBy = Arrays.asList(cb.asc(root.get(Instructor_.id)),
cb.asc(insIdProofJoin.get(IdProof_.proofNo)), cb.asc(insVehicleJoin.get(Vehicle_.vehicleNumber)),
cb.asc(studentInsJoin.get(Instructor_.name)), cb.asc(studentVehicleJoin.get(Vehicle_.vehicleNumber)),
cb.asc(vehicleDocumentJoin.get(Document_.name)));
// prepare query
cq.select(selection).where(where).orderBy(orderBy);
DataPrinters.listDataPrinter.accept(queryExecutor.fetchListForCriteriaQuery(cq));
}
Hibernate does not allow for specifying time zones by annotation or any other means. If you use Calendar instead of date, you can implement a workaround using HIbernate property AccessType and implementing the mapping yourself. The more advanced solution is to implement a custom UserType to map your Date or Calendar. Both solutions are explained in my blog post here: http://www.joobik.com/2010/11/mapping-dates-and-time-zones-with.html
Here are the ways to assign parent object in child object of Bi-directional relations ?
Suppose you have a relation say One-To-Many,then for each parent object,a set of child object exists. In bi-directional relations,each child object will have reference to its parent.
eg : Each Department will have list of Employees and each Employee is part of some department.This is called Bi directional relations.
To achieve this, one way is to assign parent in child object while persisting parent object
Parent parent = new Parent();
...
Child c1 = new Child();
...
c1.setParent(parent);
List<Child> children = new ArrayList<Child>();
children.add(c1);
parent.setChilds(children);
session.save(parent);
Other way is, you can do using hibernate Intercepter,this way helps you not to write above code for all models.
Hibernate interceptor provide apis to do your own work before perform any DB operation.Likewise onSave of object, we can assign parent object in child objects using reflection.
public class CustomEntityInterceptor extends EmptyInterceptor {
@Override
public boolean onSave(
final Object entity, final Serializable id, final Object[] state, final String[] propertyNames,
final Type[] types) {
if (types != null) {
for (int i = 0; i < types.length; i++) {
if (types[i].isCollectionType()) {
String propertyName = propertyNames[i];
propertyName = propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1);
try {
Method method = entity.getClass().getMethod("get" + propertyName);
List<Object> objectList = (List<Object>) method.invoke(entity);
if (objectList != null) {
for (Object object : objectList) {
String entityName = entity.getClass().getSimpleName();
Method eachMethod = object.getClass().getMethod("set" + entityName, entity.getClass());
eachMethod.invoke(object, entity);
}
}
} catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
}
return true;
}
}
And you can register Intercepter to configuration as
new Configuration().setInterceptor( new CustomEntityInterceptor() );
No. See also this link Handle conditional null in HQL for tips and tricks on how to handle comparisons with both null and non-null values.
Try swich fetchType from LAZY to EAGER
...
@OneToMany(fetch=FetchType.EAGER)
private Set<NodeValue> nodeValues;
...
But in this case your app will fetch data from DB anyway. If this query very hard - this may impact on performance. More here: https://docs.oracle.com/javaee/6/api/javax/persistence/FetchType.html
==> 73
By using this way you can get the list of selected records.
GregorianCalendar gregorianCalendar = new GregorianCalendar();
Criteria cri = session.createCriteria(ProjectActivities.class);
cri.add(Restrictions.ge("EffectiveFrom", gregorianCalendar.getTime()));
List list = cri.list();
All the Records will be generated into list which are greater than or equal to '08-Oct-2012' or else pass the date of user acceptance date at 2nd parameter of Restrictions (gregorianCalendar.getTime()
) of criteria to get the records.
A simple alternative to using a custom UserType is to construct a new java.util.Date in the setter for the date property in your persisted bean, eg:
import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.Column;
@Entity
public class Purchase {
private Date date;
@Column
public Date getDate() {
return this.date;
}
public void setDate(Date date) {
// force java.sql.Timestamp to be set as a java.util.Date
this.date = new Date(date.getTime());
}
}
As per the hibernate
docs here,
Connection connection()
Deprecated. (scheduled for removal in 4.x). Replacement depends on need; for doing direct JDBC stuff use doWork(org.hibernate.jdbc.Work) ...
Use Hibernate Work API instead:
Session session = entityManager.unwrap(Session.class);
session.doWork(new Work() {
@Override
public void execute(Connection connection) throws SQLException {
// do whatever you need to do with the connection
}
});
For Single valued associations, i.e.-One-to-One and Many-to-One:-
Default Lazy=proxy
Proxy lazy loading:- This implies a proxy object of your associated entity is loaded. This means that only the id connecting the two entities is loaded for the proxy object of associated entity.
Eg: A and B are two entities with Many to one association. ie: There may be multiple A's for every B. Every object of A will contain a reference of B.
`
public class A{
int aid;
//some other A parameters;
B b;
}
public class B{
int bid;
//some other B parameters;
}
`
The relation A will contain columns(aid,bid,...other columns of entity A).
The relation B will contain columns(bid,...other columns of entity B)
Proxy implies when A is fetched, only id is fetched for B and stored into a proxy object of B which contains only id.
Proxy object of B is a an object of a proxy-class which is a subclass of B with only minimal fields.
Since bid is already part of relation A, it is not necessary to fire a query to get bid from the relation B.
Other attributes of entity B are lazily loaded only when a field other than bid is accessed.
For Collections, i.e.-Many-to-Many and One-to-Many:-
Default Lazy=true
Please also note that the fetch strategy(select,join etc) can override lazy.
ie: If lazy='true' and fetch='join', fetching of A will also fetch B or Bs(In case of collections). You can get the reason if you think about it.
Default fetch for single valued association is "join".
Default fetch for collections is "select".
Please verify the last two lines. I have deduced that logically.
[quote from http://www.javabeat.net/session-factory-hibernate-4/]
There are many APIs deprecated in the hibernate core framework. One of the frustrating point at this time is, hibernate official documentation is not providing the clear instructions on how to use the new API and it stats that the documentation is in complete. Also each incremental version gets changes on some of the important API. One such thing is the new API for creating the session factory in Hibernate 4.3.0 on wards. In our earlier versions we have created the session factory as below:
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
The method buildSessionFactory is deprecated from the hibernate 4 release and it is replaced with the new API. If you are using the hibernate 4.3.0 and above, your code has to be:
Configuration configuration = new Configuration().configure();
StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
SessionFactory factory = configuration.buildSessionFactory(builder.build());
Class ServiceRegistryBuilder is replaced by StandardServiceRegistryBuilder from 4.3.0. It looks like there will be lot of changes in the 5.0 release. Still there is not much clarity on the deprecated APIs and the suitable alternatives to use. Every incremental release comes up with more deprecated API, they are in way of fine tuning the core framework for the release 5.0.
This question has some good answers about different persistence methods in Hibernate. To answer your question directly, with save() the insert statement is executed immediately regardless of transaction state. It returns the inserted key so you can do something like this:
long newKey = session.save(myObj);
So use save() if you need an identifier assigned to the persistent instance immediately.
With persist(), the insert statement is executed in a transaction, not necessarily immediately. This is preferable in most cases.
Use persist() if you don't need the insert to happen out-of-sequence with the transaction and you don't need the inserted key returned.
If the relation must not be bidirectional then an @ElementCollection might be easier than using a lazy One2Many collection.
By using EntityManager, code is no longer tightly coupled with hibernate. But for this, in usage we should use :
javax.persistence.EntityManager
instead of
org.hibernate.ejb.HibernateEntityManager
Similarly, for EntityManagerFactory, use javax interface. That way, the code is loosely coupled. If there is a better JPA 2 implementation than hibernate, switching would be easy. In extreme case, we could type cast to HibernateEntityManager.
I add in myApp.java, after @SpringBootApplication
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
And changed
@SpringBootApplication => @Configuration
So, I have this in my main class (myApp.java)
package br.com.company.project.app;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.context.annotation.Configuration;
@Configuration
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class SomeApplication {
public static void main(String[] args) {
SpringApplication.run(SomeApplication.class, args);
}
}
And work for me! =)
In case anyone else lands here with the same issue I encountered. I was getting the same error as above:
Invocation of init method failed; nested exception is org.hibernate.MappingException: Could not determine type for: java.util.Collection, at table:
Hibernate uses reflection to determine which columns are in an entity. I had a private method that started with 'get' and returned an object that was also a hibernate entity. Even private getters that you want hibernate to ignore have to be annotated with @Transient. Once I added the @Transient annotation everything worked.
@Transient
private List<AHibernateEntity> getHibernateEntities() {
....
}
From the Java EE documentation:
public abstract boolean unique
(Optional) Whether the property is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint is only a single field. This constraint applies in addition to any constraint entailed by primary key mapping and to constraints specified at the table level.
See doc
Here's the list of logger categories:
Category Function
org.hibernate.SQL Log all SQL DML statements as they are executed
org.hibernate.type Log all JDBC parameters
org.hibernate.tool.hbm2ddl Log all SQL DDL statements as they are executed
org.hibernate.pretty Log the state of all entities (max 20 entities) associated with the session at flush time
org.hibernate.cache Log all second-level cache activity
org.hibernate.transaction Log transaction related activity
org.hibernate.jdbc Log all JDBC resource acquisition
org.hibernate.hql.ast.AST Log HQL and SQL ASTs during query parsing
org.hibernate.secure Log all JAAS authorization requests
org.hibernate Log everything (a lot of information, but very useful for troubleshooting)
Formatted for pasting into a log4j XML configuration file:
<!-- Log all SQL DML statements as they are executed -->
<Logger name="org.hibernate.SQL" level="debug" />
<!-- Log all JDBC parameters -->
<Logger name="org.hibernate.type" level="debug" />
<!-- Log all SQL DDL statements as they are executed -->
<Logger name="org.hibernate.tool.hbm2ddl" level="debug" />
<!-- Log the state of all entities (max 20 entities) associated with the session at flush time -->
<Logger name="org.hibernate.pretty" level="debug" />
<!-- Log all second-level cache activity -->
<Logger name="org.hibernate.cache" level="debug" />
<!-- Log transaction related activity -->
<Logger name="org.hibernate.transaction" level="debug" />
<!-- Log all JDBC resource acquisition -->
<Logger name="org.hibernate.jdbc" level="debug" />
<!-- Log HQL and SQL ASTs during query parsing -->
<Logger name="org.hibernate.hql.ast.AST" level="debug" />
<!-- Log all JAAS authorization requests -->
<Logger name="org.hibernate.secure" level="debug" />
<!-- Log everything (a lot of information, but very useful for troubleshooting) -->
<Logger name="org.hibernate" level="debug" />
NB: Most of the loggers use the DEBUG level, however org.hibernate.type uses TRACE. In previous versions of Hibernate org.hibernate.type also used DEBUG, but as of Hibernate 3 you must set the level to TRACE (or ALL) in order to see the JDBC parameter binding logging.
And a category is specified as such:
<logger name="org.hibernate">
<level value="ALL" />
<appender-ref ref="FILE"/>
</logger>
It must be placed before the root element.
"mxc" is right. fetchType
just specifies when the relation should be resolved.
To optimize eager loading by using an outer join you have to add
@Fetch(FetchMode.JOIN)
to your field. This is a hibernate specific annotation.
This sounds like a ClassLoader conflict. I'd bet you have the javax.persistence api 1.x on the classpath somewhere, whereas Spring is trying to access ValidationMode
, which was only introduced in JPA 2.0.
Since you use Maven, do mvn dependency:tree
, find the artifact:
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0</version>
</dependency>
And remove it from your setup. (See Excluding Dependencies)
AFAIK there is no such general distribution for JPA 2, but you can use this Hibernate-specific version:
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
</dependency>
OK, since that doesn't work, you still seem to have some JPA-1 version in there somewhere. In a test method, add this code:
System.out.println(EntityManager.class.getProtectionDomain()
.getCodeSource()
.getLocation());
See where that points you and get rid of that artifact.
Ahh, now I finally see the problem. Get rid of this:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jpa</artifactId>
<version>2.0.8</version>
</dependency>
and replace it with
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>3.2.5.RELEASE</version>
</dependency>
On a different note, you should set all test libraries (spring-test, easymock etc.) to
<scope>test</scope>
Whenever you will face below error just follow it.
org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here at org.springframework.orm.hibernate3.SpringSessionContext.currentSession(SpringSessionContext.java:63)
Put a @Transactional
annotation for each method of implementing classes.
Take a look at Blaze-Persistence Entity Views which works on top of JPA and provides first class DTO support. You can project anything to attributes within Entity Views and it will even reuse existing join nodes for associations if possible.
Here is an example mapping
@EntityView(Order.class)
interface OrderSummary {
Integer getId();
@Mapping("SUM(orderPositions.price * orderPositions.amount * orderPositions.tax)")
BigDecimal getOrderAmount();
@Mapping("COUNT(orderPositions)")
Long getItemCount();
}
Fetching this will generate a JPQL/HQL query similar to this
SELECT
o.id,
SUM(p.price * p.amount * p.tax),
COUNT(p.id)
FROM
Order o
LEFT JOIN
o.orderPositions p
GROUP BY
o.id
Here is a blog post about custom subquery providers which might be interesting to you as well: https://blazebit.com/blog/2017/entity-view-mapping-subqueries.html
This is pure JPA without using getters/setters. As of 2013/2014 it is the best answer without using any Hibernate specific annotations, but please note this solution is JPA 2.1, and was not available when the question was first asked:
@Entity
public class Person {
@Convert(converter=BooleanToStringConverter.class)
private Boolean isAlive;
...
}
And then:
@Converter
public class BooleanToStringConverter implements AttributeConverter<Boolean, String> {
@Override
public String convertToDatabaseColumn(Boolean value) {
return (value != null && value) ? "Y" : "N";
}
@Override
public Boolean convertToEntityAttribute(String value) {
return "Y".equals(value);
}
}
Edit:
The implementation above considers anything different from character "Y", including null
, as false
. Is that correct? Some people here consider this incorrect, and believe that null
in the database should be null
in Java.
But if you return null
in Java, it will give you a NullPointerException
if your field is a primitive boolean. In other words, unless some of your fields actually use the class Boolean it's best to consider null
as false
, and use the above implementation. Then Hibernate will not to emit any exceptions regardless of the contents of the database.
And if you do want to accept null
and emit exceptions if the contents of the database are not strictly correct, then I guess you should not accept any characters apart from "Y", "N" and null
. Make it consistent, and don't accept any variations like "y", "n", "0" and "1", which will only make your life harder later. This is a more strict implementation:
@Override
public String convertToDatabaseColumn(Boolean value) {
if (value == null) return null;
else return value ? "Y" : "N";
}
@Override
public Boolean convertToEntityAttribute(String value) {
if (value == null) return null;
else if (value.equals("Y")) return true;
else if (value.equals("N")) return false;
else throw new IllegalStateException("Invalid boolean character: " + value);
}
And yet another option, if you want to allow for null
in Java but not in the database:
@Override
public String convertToDatabaseColumn(Boolean value) {
if (value == null) return "-";
else return value ? "Y" : "N";
}
@Override
public Boolean convertToEntityAttribute(String value) {
if (value.equals("-") return null;
else if (value.equals("Y")) return true;
else if (value.equals("N")) return false;
else throw new IllegalStateException("Invalid boolean character: " + value);
}
try below code it will solve your problem.
Configuration configuration = new Configuration().configure("/logic/hibernate.cfg.xml");
Just @OneToMany(cascade = CascadeType.ALL, mappedBy = "xxx", fetch = FetchType.LAZY, orphanRemoval = true)
.
Remove targetEntity = MyClass.class, it works great.
This worked for me . In my case 2 tables foo and boo have to be joined based on 3 different columns.Please note in my case ,in boo the 3 common columns are not primary key
i.e., one to one mapping based on 3 different columns
@Entity
@Table(name = "foo")
public class foo implements Serializable
{
@Column(name="foocol1")
private String foocol1;
//add getter setter
@Column(name="foocol2")
private String foocol2;
//add getter setter
@Column(name="foocol3")
private String foocol3;
//add getter setter
private Boo boo;
private int id;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "brsitem_id", updatable = false)
public int getId()
{
return this.id;
}
public void setId(int id)
{
this.id = id;
}
@OneToOne
@JoinColumns(
{
@JoinColumn(updatable=false,insertable=false, name="foocol1", referencedColumnName="boocol1"),
@JoinColumn(updatable=false,insertable=false, name="foocol2", referencedColumnName="boocol2"),
@JoinColumn(updatable=false,insertable=false, name="foocol3", referencedColumnName="boocol3")
}
)
public Boo getBoo()
{
return boo;
}
public void setBoo(Boo boo)
{
this.boo = boo;
}
}
@Entity
@Table(name = "boo")
public class Boo implements Serializable
{
private int id;
@Column(name="boocol1")
private String boocol1;
//add getter setter
@Column(name="boocol2")
private String boocol2;
//add getter setter
@Column(name="boocol3")
private String boocol3;
//add getter setter
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "item_id", updatable = false)
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
}
Hiberante supports the feature of lazy initialization for both entities and collections. Hibernate engine loads only those objects that we are querying for does not other entites or collections.
lazy="false" by default loading initialization mention for the only child is lazy.in case of true that is parent is loading does not support child
In addition to adding @Transactional
on @Test
method, you also need to add @Rollback(false)
To quickly fetch the causing exception without the need to re-code or rebuild, set a breakpoint on
org.hibernate.ejb.TransactionImpl.setRollbackOnly() // Hibernate < 4.3, or
org.hibernate.jpa.internal.TransactionImpl() // as of Hibernate 4.3
and go up in the stack, usually to some Interceptor. There you can read the causing exception from some catch block.
Since JPA 2.0 a TypedQuery
can be used:
TypedQuery<SimpleEntity> q =
em.createQuery("select t from SimpleEntity t", SimpleEntity.class);
List<SimpleEntity> listOfSimpleEntities = q.getResultList();
for (SimpleEntity entity : listOfSimpleEntities) {
// do something useful with entity;
}
You can you the distinct keyword in you criteria builder like this.
CriteriaBuilder builder = session.getCriteriaBuilder();
CriteriaQuery<Orders> query = builder.createQuery(Orders.class);
Root<Orders> root = query.from(Orders.class);
query.distinct(true).multiselect(root.get("cust_email").as(String.class));
And create the field constructor in your model class.
in HQL you can use query parameter and set Collection with setParameterList method.
Query q = session.createQuery("SELECT entity FROM Entity entity WHERE name IN (:names)");
q.setParameterList("names", names);
Another solution is add @JsonIgnore :
@OneToMany(mappedBy="catalog", fetch = FetchType.LAZY)
@JsonIgnore
private Set<Product> products = new HashSet<Product>(0);
As the question is asked simply use @Min(1) instead of @size on integer fields and it will work.
Use:
((Long) userService.getAttendanceList(currentUser)).intValue();
instead.
The .intValue()
method is defined in class Number
, which Long
extends.
allocationSize=1
It is a micro optimization before getting query Hibernate tries to assign value in the range of allocationSize and so try to avoid querying database for sequence. But this query will be executed every time if you set it to 1. This hardly makes any difference since if your data base is accessed by some other application then it will create issues if same id is used by another application meantime .
Next generation of Sequence Id is based on allocationSize.
By defualt it is kept as 50
which is too much. It will also only help if your going to have near about 50
records in one session which are not persisted and which will be persisted using this particular session and transation.
So you should always use allocationSize=1
while using SequenceGenerator
. As for most of underlying databases sequence is always incremented by 1
.
YES, You can do this on bellow ways:
1. By CrudRepository (Projection)
Spring Data Repositories usually return the domain model when using query methods. However, sometimes, you may need to alter the view of that model for various reasons.
Suppose your entity is like this :
import javax.persistence.*;
import java.math.BigDecimal;
@Entity
@Table(name = "USER_INFO_TEST")
public class UserInfoTest {
private int id;
private String name;
private String rollNo;
public UserInfoTest() {
}
public UserInfoTest(int id, String name) {
this.id = id;
this.name = name;
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "ID", nullable = false, precision = 0)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "name", nullable = true)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Basic
@Column(name = "roll_no", nullable = true)
public String getRollNo() {
return rollNo;
}
public void setRollNo(String rollNo) {
this.rollNo = rollNo;
}
}
Now your Projection class is like bellow. It can those fields that you needed.
public interface IUserProjection {
int getId();
String getName();
String getRollNo();
}
And Your Data Access Object(Dao) is like bellow
:
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import java.util.ArrayList;
public interface UserInfoTestDao extends CrudRepository<UserInfoTest,Integer> {
@Query(value = "select id,name,roll_no from USER_INFO_TEST where rollNo = ?1", nativeQuery = true)
ArrayList<IUserProjection> findUserUsingRollNo(String rollNo);
}
Now ArrayList<IUserProjection> findUserUsingRollNo(String rollNo)
will give you the list of user.
2. Using EntityManager
Suppose your query is "select id,name from users where roll_no = 1001".
Here query will return a object with id and name column. Your Response class is like bellow:
Your Response class is like:
public class UserObject{
int id;
String name;
String rollNo;
public UserObject(Object[] columns) {
this.id = (columns[0] != null)?((BigDecimal)columns[0]).intValue():0;
this.name = (String) columns[1];
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRollNo() {
return rollNo;
}
public void setRollNo(String rollNo) {
this.rollNo = rollNo;
}
}
here UserObject constructor will get a Object Array and set data with object.
public UserObject(Object[] columns) {
this.id = (columns[0] != null)?((BigDecimal)columns[0]).intValue():0;
this.name = (String) columns[1];
}
Your query executing function is like bellow :
public UserObject getUserByRoll(EntityManager entityManager,String rollNo) {
String queryStr = "select id,name from users where roll_no = ?1";
try {
Query query = entityManager.createNativeQuery(queryStr);
query.setParameter(1, rollNo);
return new UserObject((Object[]) query.getSingleResult());
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
Here you have to import bellow packages:
import javax.persistence.Query;
import javax.persistence.EntityManager;
Now your main class, you have to call this function. First get EntityManager and call this getUserByRoll(EntityManager entityManager,String rollNo)
function. Calling procedure is given bellow:
Here is the Imports
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
get EntityManager
from this way:
@PersistenceContext
private EntityManager entityManager;
UserObject userObject = getUserByRoll(entityManager,"1001");
Now you have data in this userObject.
Note:
query.getSingleResult() return a object array. You have to maintain the column position and data type with query column position.
select id,name from users where roll_no = 1001
query return a array and it's [0] --> id and [1] -> name
.
More info visit this thread and this Thread
Thanks :)
It worked for me after adding the following dependency in pom,
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.3.0.Final</version>
</dependency>
I resolved this issue by excluding byte-buddy dependency from springfox
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
<exclusions>
<exclusion>
<groupId>net.bytebuddy</groupId>
<artifactId>byte-buddy</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
<exclusions>
<exclusion>
<groupId>net.bytebuddy</groupId>
<artifactId>byte-buddy</artifactId>
</exclusion>
</exclusions>
</dependency>
Dropping the table from the database manually and then re-running the application worked for me. In my case table was not created properly(with constraints) I guess.
Go to the menu Help
> Install New Software
and click the Add
button.
Use something like JBoss Hibernate for the name and insert the following URL for the location:
http://download.jboss.org/jbosstools/neon/stable/updates/
Wait for the product tree to load and then expand the JBoss Web and Java EE Development
folder and select the Hibernate Tools
product and click the Next >
button. Then follow on accepting all the subsequent questions, licence, etc.
When the installation is finished, restart Eclipse as required. After that, to open the Hibernate perspective go to the menu Window
> Perspective
> Open Perspective
> Others
and search for Hibernate.
Can I see (...) the real SQL
If you want to see the SQL sent directly to the database (that is formatted similar to your example), you'll have to use some kind of jdbc driver proxy like P6Spy (or log4jdbc).
Alternatively you can enable logging of the following categories (using a log4j.properties
file here):
log4j.logger.org.hibernate.SQL=DEBUG
log4j.logger.org.hibernate.type=TRACE
The first is equivalent to hibernate.show_sql=true
, the second prints the bound parameters among other things.
With appFuse framework, you can create an Spring MVC archetype with jpa support, etc ...
Take a look at it's quickStart guide to see how to create an archetype based on this Framework.
Foundational frameworks in AppFuse:
For example to create an appFuse light archetype :
mvn archetype:generate -B -DarchetypeGroupId=org.appfuse.archetypes
-DarchetypeArtifactId=appfuse-light-struts-archetype -DarchetypeVersion=2.2.1
-DgroupId=com.mycompany -DartifactId=myproject
There are arguments for both, but most of them stem from certain user requirements "what if you need to add logic for", or "xxxx breaks encapsulation". However, nobody has really commented on the theory, and given a properly reasoned argument.
What is Hibernate/JPA actually doing when it persists an object - well, it is persisting the STATE of the object. That means storing it in a way that it can be easily reproduced.
What is encapsulation? Encapsulations means encapsulating the data (or state) with an interface that the application/client can use to access the data safely - keeping it consistent and valid.
Think of this like MS Word. MS Word maintains a model of the document in memory - the documents STATE. It presents an interface that the user can use to modify the document - a set of buttons, tools, keyboard commands etc. However, when you choose to persist (Save) that document, it saves the internal state, not the set of keypresses and mouse clicks used to generate it.
Saving the internal state of the object DOES NOT break encapsulation - otherwise you don't really understand what encapsulation means, and why it exists. It is just like object serialisation really.
For this reason, IN MOST CASES, it is appropriate to persist the FIELDS and not the ACCESSORS. This means that an object can be accurately recreated from the database exactly the way it was stored. It should not need any validation, because this was done on the original when it was created, and before it was stored in the database (unless, God forbid, you are storing invalid data in the DB!!!!). Likewise, there should be no need to calculate values, as they were already calculated before the object was stored. The object should look just the way it did before it was saved. In fact, by adding additional stuff into the getters/setters you are actually increasing the risk that you will recreate something that is not an exact copy of the original.
Of course, this functionality was added for a reason. There may be some valid use cases for persisting the accessors, however, they will typically be rare. An example may be that you want to avoid persisting a calculated value, though you may want to ask the question why you don't calculate it on demand in the value's getter, or lazily initialise it in the getter. Personally I cannot think of any good use case, and none of the answers here really give a "Software Engineering" answer.
In my case, I was copying and pasting code from my other classes, so I did not notice that the getter code was bad written:
@OneToMany(fetch = FetchType.LAZY, mappedBy = "credito")
public Set getConceptoses() {
return this.letrases;
}
public void setConceptoses(Set conceptoses) {
this.conceptoses = conceptoses;
}
All references conceptoses but if you look at the get says letrases
Your error might be in this line:
List<Long> result = query.list();
where query.list() is returning a BigInteger List instead of Long list. Try to change it to.
List<BigInteger> result = query.list();
I think you can simply change the query to return boolean as
@Query("select count(e)>0 from MyEntity e where ...")
PS:
If you are checking exists based on Primary key value CrudRepository
already have exists(id)
method.
You might try changing this line in your persistence.xml from
<property name="hbm2ddl.auto" value="create"/>
to:
<property name="hibernate.hbm2ddl.auto" value="update"/>
This is supposed to maintain the schema to follow any changes you make to the Model each time you run the app.
Got this from JavaRanch
It should be CascadeType.Merge, in that case it will update if the record already exists.
For the record, the spring.jpa.hibernate.ddl-auto
property is Spring Data JPA specific and is their way to specify a value that will eventually be passed to Hibernate under the property it knows, hibernate.hbm2ddl.auto
.
The values create
, create-drop
, validate
, and update
basically influence how the schema tool management will manipulate the database schema at startup.
For example, the update
operation will query the JDBC driver's API to get the database metadata and then Hibernate compares the object model it creates based on reading your annotated classes or HBM XML mappings and will attempt to adjust the schema on-the-fly.
The update
operation for example will attempt to add new columns, constraints, etc but will never remove a column or constraint that may have existed previously but no longer does as part of the object model from a prior run.
Typically in test case scenarios, you'll likely use create-drop
so that you create your schema, your test case adds some mock data, you run your tests, and then during the test case cleanup, the schema objects are dropped, leaving an empty database.
In development, it's often common to see developers use update
to automatically modify the schema to add new additions upon restart. But again understand, this does not remove a column or constraint that may exist from previous executions that is no longer necessary.
In production, it's often highly recommended you use none
or simply don't specify this property. That is because it's common practice for DBAs to review migration scripts for database changes, particularly if your database is shared across multiple services and applications.
Set the "long" type of id instead of java.lang.Integer. And add getters and setters to your fields.
In the Hibernate Manual you can see this example
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
for (int i = 0; i < 100000; i++) {
Customer customer = new Customer(...);
session.save(customer);
if (i % 20 == 0) { // 20, same as the JDBC batch size
// flush a batch of inserts and release memory:
session.flush();
session.clear();
}
}
tx.commit();
session.close();
Without the call to the flush method, your first-level cache would throw an OutOfMemoryException
Some how all the above solutions did not worked in hibernate 5.2.10.Final.
But setting the map to null as below worked for me:
playlist.setPlaylistadMaps(null);
hibernate.jar and hibernate-entitymanager.jar contains only the packages org.hibernate.*. So you should take it from the Glassfish project.
When you don't know whether there are any results, use getResultList()
.
List<User> foundUsers = (List<User>) query.getResultList();
if (foundUsers == null || foundUsers.isEmpty()) {
return false;
}
User foundUser = foundUsers.get(0);
One-to-Many: One Person Has Many Skills, a Skill is not reused between Person(s)
Many-to-Many: One Person Has Many Skills, a Skill is reused between Person(s)
In a One-To-Many relationship, one object is the "parent" and one is the "child". The parent controls the existence of the child. In a Many-To-Many, the existence of either type is dependent on something outside the both of them (in the larger application context).
Your subject matter (domain) should dictate whether or not the relationship is One-To-Many or Many-To-Many -- however, I find that making the relationship unidirectional or bidirectional is an engineering decision that trades off memory, processing, performance, etc.
What can be confusing is that a Many-To-Many Bidirectional relationship does not need to be symmetric! That is, a bunch of People could point to a skill, but the skill need not relate back to just those people. Typically it would, but such symmetry is not a requirement. Take love, for example -- it is bi-directional ("I-Love", "Loves-Me"), but often asymmetric ("I love her, but she doesn't love me")!
All of these are well supported by Hibernate and JPA. Just remember that Hibernate or any other ORM doesn't give a hoot about maintaining symmetry when managing bi-directional many-to-many relationships...thats all up to the application.
Could this exception be thrown during an unfinished transaction, where your application is attempting to create an entity with a duplicate field to the identifier you are using to try find a single entity?
In this case the new (duplicate) entity will not be visible in the database as the transaction won't have, and will never be committed to the db. The exception will still be thrown however.
In my case, I was fetching data from database, changing some column values and updating it in database but for updating I was using the same save query which was violating primary key constraints i.e duplicate values for primary key, so I had written a separate query for updating the columns and it solved my problem..!
@Table's name attribute is the actual table name. @Entitiy's name is useful if you have two @Entity classes with the same name and you need a way to differentiate them when running queries.
The mappedBy
attribute is referencing customer
while the property is mCustomer
, hence the error message. So either change your mapping into:
/** The collection of stores. */
@OneToMany(mappedBy = "mCustomer", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private Collection<Store> stores;
Or change the entity property into customer
(which is what I would do).
The mappedBy reference indicates "Go look over on the bean property named 'customer' on the thing I have a collection of to find the configuration."
You can write your native or non-native query the way you want, and you can wrap JPQL query results with instances of custom result classes. Create a DTO with the same names of columns returned in query and create an all argument constructor with same sequence and names as returned by the query. Then use following way to query the database.
@Query("SELECT NEW example.CountryAndCapital(c.name, c.capital.name) FROM Country AS c")
Create DTO:
package example;
public class CountryAndCapital {
public String countryName;
public String capitalName;
public CountryAndCapital(String countryName, String capitalName) {
this.countryName = countryName;
this.capitalName = capitalName;
}
}
We had a problem with the (deprecated) dialect org.hibernate.dialect.Oracledialect
and Oracle 11g database using hibernate.hbm2ddl.auto = validate
mode.
With this dialect Hibernate was unable to found the sequences (because the implementation of the getQuerySequencesString()
method, that returns this query:
"select sequence_name from user_sequences;"
for which the execution returns an empty result from database).
Using the dialect org.hibernate.dialect.Oracle9iDialect
, or greater, solves the problem, due to a different implementation of getQuerySequencesString()
method:
"select sequence_name from all_sequences union select synonym_name from all_synonyms us, all_sequences asq where asq.sequence_name = us.table_name and asq.sequence_owner = us.table_owner;"
that returns all the sequences if executed, instead.
Use count(d.ertek)
or count(d.id)
instead of count(d)
. This can be happen when you have composite primary key at your entity.
In order to avoid hardcoding schema in JPA Entity Java Classes we used orm.xml mapping file in Java EE application deployed in OracleApplicationServer10 (OC4J,Orion). It lays in model.jar/META-INF/ as well as persistence.xml. Mapping file orm.xml is referenced from peresistence.xml with tag
...
<persistence-unit name="MySchemaPU" transaction-type="JTA">
<provider>
<mapping-file>META-INF/orm.xml</mapping-file>
...
File orm.xml content is cited below:
<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
version="1.0">
<persistence-unit-metadata>
<persistence-unit-defaults>
<schema>myschema</schema>
</persistence-unit-defaults>
</persistence-unit-metadata>
</entity-mappings>
Use component scanning as given below, if com.project.action.PasswordHintAction
is annotated with stereotype annotations
<context:component-scan base-package="com.project.action"/>
EDIT
I see your problem, in PasswordHintActionTest
you are autowiring PasswordHintAction
. But you did not create bean configuration for PasswordHintAction
to autowire. Add one of stereotype annotation(@Component, @Service, @Controller
) to PasswordHintAction
like
@Component
public class PasswordHintAction extends BaseAction {
private static final long serialVersionUID = -4037514607101222025L;
private String username;
or create xml configuration in applicationcontext.xml
like
<bean id="passwordHintAction" class="com.project.action.PasswordHintAction" />
cq.select(cb.construct(entityClazz.class, root.get("ID"), root.get("VERSION"))); // HERE IS NO ERROR
In case you are using the Session API the PrePersist and PreUpdate callbacks won't work according to this answer.
I am using Hibernate Session's persist() method in my code so the only way I could make this work was with the code below and following this blog post (also posted in the answer).
@MappedSuperclass
public abstract class AbstractTimestampEntity {
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "created")
private Date created=new Date();
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "updated")
@Version
private Date updated;
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public Date getUpdated() {
return updated;
}
public void setUpdated(Date updated) {
this.updated = updated;
}
}
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to id.co.bni.switcherservice.model.SwitcherServiceSource
Problem is
(List<SwitcherServiceSource>) LoadSource.list();
This will return a List of Object arrays (Object[]) with scalar values for each column in the SwitcherServiceSource
table. Hibernate will use ResultSetMetadata to deduce the actual order and types of the returned scalar values.
List<Object> result = (List<Object>) LoadSource.list();
Iterator itr = result.iterator();
while(itr.hasNext()){
Object[] obj = (Object[]) itr.next();
//now you have one array of Object for each row
String client = String.valueOf(obj[0]); // don't know the type of column CLIENT assuming String
Integer service = Integer.parseInt(String.valueOf(obj[1])); //SERVICE assumed as int
//same way for all obj[2], obj[3], obj[4]
}
JPA is just a specification which needs concrete implementation. The default implementation provided by oracle is "Eclipselink" now. Toplink is donated by Oracle to Eclipse foundation to merge with eclipselink.
Using Eclipselink, one can be sure that the code is portable to any implementation if need arises. Hibernate is also a full JPA implementation + MORE. Hibernate is super set of JPA with some extra Hibernate specific functionality. So application developed in Hibernate may not be compatible when switched to other implementation. Still hibernate is choice of majority of developers as JPA implementation and widely used.
Another JPA implementation is OpenJPA, which is an extension of Kodo implementation.
Placing @Transient
on getter with private field worked for me.
private String name;
@Transient
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
The message is clear: you have a repeated column in the mapping. That means you mapped the same database column twice. And indeed, you have:
@Column(nullable=false)
private Long customerId;
and also:
@ManyToOne(optional=false)
@JoinColumn(name="customerId",referencedColumnName="id_customer")
private Customer customer;
(and the same goes for productId
/product
).
You shouldn't reference other entities by their ID, but by a direct reference to the entity. Remove the customerId
field, it's useless. And do the same for productId
. If you want the customer ID of a sale, you just need to do this:
sale.getCustomer().getId()
I guess your entity_property
has a composite key (entity_id, name)
where entity_id
is a foreign key to entity
. If so, you can map it as follows:
@Embeddable
public class EntityPropertyPK {
@Column(name = "name")
private String name;
@ManyToOne
@JoinColumn(name = "entity_id")
private Entity entity;
...
}
@Entity
@Table(name="entity_property")
public class EntityProperty {
@EmbeddedId
private EntityPropertyPK id;
@Column(name = "value")
private String value;
...
}
It's hard to know for sure without seeing the mappings (see @Juha's comment), but I think you want something like the following:
Criteria c = session.createCriteria(Cat.class);
Criteria c2 = c.createCriteria("mother");
Criteria c3 = c2.createCriteria("kind");
c3.addOrder(Order.asc("value"));
return c.list();
I Solved this problem adding @Cascade to the @ManyToOne attribute.
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
@ManyToOne
@JoinColumn(name="BLOODGRUPID")
@Cascade({CascadeType.MERGE, CascadeType.SAVE_UPDATE})
private Bloodgroup bloodgroup;
With Spring Data JPA and Hibernate, I was using subinterfaces of JpaRepository
to look up objects belonging to a type hierarchy that was mapped using the "join" strategy. Unfortunately, the queries were returning proxies of the base type instead of instances of the expected concrete types. This prevented me from casting the results to the correct types. Like you, I came here looking for an effective way to get my entites unproxied.
Vlad has the right idea for unproxying these results; Yannis provides a little more detail. Adding to their answers, here's the rest of what you might be looking for:
The following code provides an easy way to unproxy your proxied entities:
import org.hibernate.engine.spi.PersistenceContext;
import org.hibernate.engine.spi.SessionImplementor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.jpa.repository.JpaContext;
import org.springframework.stereotype.Component;
@Component
public final class JpaHibernateUtil {
private static JpaContext jpaContext;
@Autowired
JpaHibernateUtil(JpaContext jpaContext) {
JpaHibernateUtil.jpaContext = jpaContext;
}
public static <Type> Type unproxy(Type proxied, Class<Type> type) {
PersistenceContext persistenceContext =
jpaContext
.getEntityManagerByManagedType(type)
.unwrap(SessionImplementor.class)
.getPersistenceContext();
Type unproxied = (Type) persistenceContext.unproxyAndReassociate(proxied);
return unproxied;
}
}
You can pass either unproxied entites or proxied entities to the unproxy
method. If they are already unproxied, they'll simply be returned. Otherwise, they'll get unproxied and returned.
Hope this helps!
What is the portable way to annotate a byte[] property?
It depends on what you want. JPA can persist a non annotated byte[]
. From the JPA 2.0 spec:
11.1.6 Basic Annotation
The
Basic
annotation is the simplest type of mapping to a database column. TheBasic
annotation can be applied to a persistent property or instance variable of any of the following types: Java primitive, types, wrappers of the primitive types,java.lang.String
,java.math.BigInteger
,java.math.BigDecimal
,java.util.Date
,java.util.Calendar
,java.sql.Date
,java.sql.Time
,java.sql.Timestamp
,byte[]
,Byte[]
,char[]
,Character[]
, enums, and any other type that implementsSerializable
. As described in Section 2.8, the use of theBasic
annotation is optional for persistent fields and properties of these types. If the Basic annotation is not specified for such a field or property, the default values of the Basic annotation will apply.
And Hibernate will map a it "by default" to a SQL VARBINARY
(or a SQL LONGVARBINARY
depending on the Column
size?) that PostgreSQL handles with a bytea
.
But if you want the byte[]
to be stored in a Large Object, you should use a @Lob
. From the spec:
11.1.24 Lob Annotation
A
Lob
annotation specifies that a persistent property or field should be persisted as a large object to a database-supported large object type. Portable applications should use theLob
annotation when mapping to a databaseLob
type. TheLob
annotation may be used in conjunction with the Basic annotation or with theElementCollection
annotation when the element collection value is of basic type. ALob
may be either a binary or character type. TheLob
type is inferred from the type of the persistent field or property and, except for string and character types, defaults to Blob.
And Hibernate will map it to a SQL BLOB
that PostgreSQL handles with a oid
.
Is this fixed in some recent version of hibernate?
Well, the problem is that I don't know what the problem is exactly. But I can at least say that nothing has changed since 3.5.0-Beta-2 (which is where a changed has been introduced)in the 3.5.x branch.
But my understanding of issues like HHH-4876, HHH-4617 and of PostgreSQL and BLOBs (mentioned in the javadoc of the PostgreSQLDialect
) is that you are supposed to set the following property
hibernate.jdbc.use_streams_for_binary=false
if you want to use oid
i.e. byte[]
with @Lob
(which is my understanding since VARBINARY
is not what you want with Oracle). Did you try this?
As an alternative, HHH-4876 suggests using the deprecated PrimitiveByteArrayBlobType
to get the old behavior (pre Hibernate 3.5).
From stack trace:
HikariPool: Timeout failure pool HikariPool-0 stats (total=20, active=20, idle=0, waiting=0) Means pool reached maximum connections limit set in configuration.
The next line: HikariPool-0 - Connection is not available, request timed out after 30000ms. Means pool waited 30000ms for free connection but your application not returned any connection meanwhile.
Mostly it is connection leak (connection is not closed after borrowing from pool), set leakDetectionThreshold to the maximum value that you expect SQL query would take to execute.
otherwise, your maximum connections 'at a time' requirement is higher than 20 !
I think you need OpenSessionInViewFilter to keep your session open during view rendering (but it is not too good practice).
For me I had to manually uninstall mysql
brew uninstall mysql
rm -rf /usr/local/var/mysql
brew install mysql
I will answer this question in terms of AngularFire, Firebase's library for Angular.
Tl;dr: superpowers. :-)
AngularFire's three-way data binding. Angular binds the view and the $scope, i.e., what your users do in the view automagically updates in the local variables, and when your JavaScript updates a local variable the view automagically updates. With Firebase the cloud database also updates automagically. You don't need to write $http.get or $http.put requests, the data just updates.
Five-way data binding, and seven-way, nine-way, etc. I made a tic-tac-toe game using AngularFire. Two players can play together, with the two views updating the two $scopes and the cloud database. You could make a game with three or more players, all sharing one Firebase database.
AngularFire's OAuth2 library makes authorization easy with Facebook, GitHub, Google, Twitter, tokens, and passwords.
Double security. You can set up your Angular routes to require authorization, and set up rules in Firebase about who can read and write data.
There's no back end. You don't need to make a server with Node and Express. Running your own server can be a lot of work, require knowing about security, require that someone do something if the server goes down, etc.
Fast. If your server is in San Francisco and the client is in San Jose, fine. But for a client in Bangalore connecting to your server will be slower. Firebase is deployed around the world for fast connections everywhere.
This errors have two common causes: The element has been deleted entirely, or the element is no longer attached to the DOM.
If you already checked if it is not your case, you could be facing the same problem as me.
The element in the DOM is not found because your page is not entirely loaded when Selenium is searching for the element. To solve that, you can put an explicit wait condition that tells Selenium to wait until the element is available to be clicked on.
from selenium.webdriver.support import expected_conditions as EC
wait = WebDriverWait(driver, 10)
element = wait.until(EC.element_to_be_clickable((By.ID, 'someid')))
The MyKey class (@Embeddable) should not have any relationships like @ManyToOne
dot
is matrix multiplication, but *
does something else.
We have two arrays:
X
, shape (97,2)y
, shape (2,1)With Numpy arrays, the operation
X * y
is done element-wise, but one or both of the values can be expanded in one or more dimensions to make them compatible. This operation is called broadcasting. Dimensions, where size is 1 or which are missing, can be used in broadcasting.
In the example above the dimensions are incompatible, because:
97 2
2 1
Here there are conflicting numbers in the first dimension (97 and 2). That is what the ValueError above is complaining about. The second dimension would be ok, as number 1 does not conflict with anything.
For more information on broadcasting rules: http://docs.scipy.org/doc/numpy/user/basics.broadcasting.html
(Please note that if X
and y
are of type numpy.matrix
, then asterisk can be used as matrix multiplication. My recommendation is to keep away from numpy.matrix
, it tends to complicate more than simplifying things.)
Your arrays should be fine with numpy.dot
; if you get an error on numpy.dot
, you must have some other bug. If the shapes are wrong for numpy.dot
, you get a different exception:
ValueError: matrices are not aligned
If you still get this error, please post a minimal example of the problem. An example multiplication with arrays shaped like yours succeeds:
In [1]: import numpy
In [2]: numpy.dot(numpy.ones([97, 2]), numpy.ones([2, 1])).shape
Out[2]: (97, 1)
There are three scenarios (that I can think of) where you would call a method in a subclass where the method exits in the parent class:
Method is not overwritten by subclass, only exists in parent.
This is the same as your example, and generally it's better to use $this -> get_species();
You are right that in this case the two are effectively the same, but the method has been inherited by the subclass, so there is no reason to differentiate. By using $this
you stay consistent between inherited methods and locally declared methods.
Method is overwritten by the subclass and has totally unique logic from the parent.
In this case, you would obviously want to use $this -> get_species();
because you don't want the parent's version of the method executed. Again, by consistently using $this
, you don't need to worry about the distinction between this case and the first.
Method extends parent class, adding on to what the parent method achieves.
In this case, you still want to use `$this -> get_species();
when calling the method from other methods of the subclass. The one place you will call the parent method would be from the method that is overwriting the parent method. Example:
abstract class Animal {
function get_species() {
echo "I am an animal.";
}
}
class Dog extends Animal {
function __construct(){
$this->get_species();
}
function get_species(){
parent::get_species();
echo "More specifically, I am a dog.";
}
}
The only scenario I can imagine where you would need to call the parent method directly outside of the overriding method would be if they did two different things and you knew you needed the parent's version of the method, not the local. This shouldn't be the case, but if it did present itself, the clean way to approach this would be to create a new method with a name like get_parentSpecies()
where all it does is call the parent method:
function get_parentSpecies(){
parent::get_species();
}
Again, this keeps everything nice and consistent, allowing for changes/modifications to the local method rather than relying on the parent method.
Just strengthening Jim's answer
Using presence one can do
class Task < ActiveRecord::Base
before_save :default_values
def default_values
self.status = status.presence || 'P'
end
end
Tail the log as a background job (&) and it will interleave with rspec output.
tail -f log/test.log &
bundle exec rspec
Alpine docker image doesn't have bash installed by default. You will need to add following commands to get bash
:
RUN apk update && apk add bash
If youre using Alpine 3.3+
then you can just do
RUN apk add --no-cache bash
to keep docker image size small. (Thanks to comment from @sprkysnrky)
Some googling reveals that potentially you've got a corrupt file:
http://bitterolives.blogspot.com/2009/03/excel-interop-comexception-hresult.html
and that you can tell excel to open it anyway with the CorruptLoad parameter, with something like...
Workbook workbook = excelApplicationObject.Workbooks.Open(path, CorruptLoad: true);
This is how I base
ically think of the problem.
my.df <- data.frame(group = rep(c(1,2), each = 3),
score = runif(6), info = letters[1:6])
my.agg <- with(my.df, aggregate(score, list(group), max))
my.df.split <- with(my.df, split(x = my.df, f = group))
my.agg$info <- unlist(lapply(my.df.split, FUN = function(x) {
x[which(x$score == max(x$score)), "info"]
}))
> my.agg
Group.1 x info
1 1 0.9344336 a
2 2 0.7699763 e
In case you are using WinPython and not anaconda then you need to navigate to the directory where you installed the WinPython for e.g. C:\WPy-3670\settings\.jupyter\jupyter_notebook_config.py
You need to edit this file and find the line
#c.NotebookApp.notebook_dir = ''
change it to for e.g.
c.NotebookApp.notebook_dir = 'D:/your_own_folder/containing/jupyter_notes'
You also need to change backslash \
to forward slashes /
. also make sure to uncomment the line by removing #
Since I cannot add this as a comment
, I will leave it here for anyone who finds backticks to be easier to read. Its basically @Reigel answer but with backticks
var numbers = [1, 2, 3, 4, 5];
var option = ``;
for (var i=0;i<numbers.length;i++){
option += `<option value=${numbers[i]}>${numbers[i]}</option>`;
}
$('#items').append(option);
This problem can be solved efficiently using the numpy_indexed library (disclaimer: I am its author); which was created to address problems of this type. npi.indices can be viewed as an n-dimensional generalisation of list.index. It will act on nd-arrays (along a specified axis); and also will look up multiple entries in a vectorized manner as opposed to a single item at a time.
a = np.random.rand(50, 60, 70)
i = np.random.randint(0, len(a), 40)
b = a[i]
import numpy_indexed as npi
assert all(i == npi.indices(a, b))
This solution has better time complexity (n log n at worst) than any of the previously posted answers, and is fully vectorized.
I'm not sure how this example works for older Web browsers but I use this for IE, Firefox and Chrome without an issue:
var iFrameDetection = (window === window.parent) ? false : true;
Use otool:
otool -TV your.dylib
OR
nm -g your.dylib
Even if I know my compiler is smart enough, I won't like to rely on it, and will use the a) variant.
The b) variant makes sense to me only if you desperately need to make the intermediateResult unavailable after the loop body. But I can't imagine such desperate situation, anyway....
EDIT: Jon Skeet made a very good point, showing that variable declaration inside a loop can make an actual semantic difference.
I think this problem can be solved in this way:
<TextView
android:id="@+id/leftText"
android:includeFontPadding="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30dp"
android:text="Hello World!\nhello world" />
<TextView
android:id="@+id/rightUpperText"
android:includeFontPadding="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/leftText"
android:layout_alignTop="@+id/leftText"
android:textSize="30dp"
android:text="Hello World!" />
<TextView
android:id="@+id/rightLowerText"
android:includeFontPadding="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/leftText"
android:layout_below="@+id/rightUpperText"
android:textSize="30dp"
android:text="hello world" />
Those are the results:
Though the line of special characters in rightLowerText looks a little bit higher than the second line of leftText, their baselines are stilled aligned.
@Column
is not the appropriate annotation. You don't want to store a whole User or Question in a column. You want to create an association between the entities. Start by renaming Questions
to Question
, since an instance represents a single question, and not several ones. Then create the association:
@Entity
@Table(name = "UserAnswer")
public class UserAnswer {
// this entity needs an ID:
@Id
@Column(name="useranswer_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@ManyToOne
@JoinColumn(name = "user_id")
private User user;
@ManyToOne
@JoinColumn(name = "question_id")
private Question question;
@Column(name = "response")
private String response;
//getter and setter
}
The Hibernate documentation explains that. Read it. And also read the javadoc of the annotations.
You just have to put it under separate folders with different names depending on orientation and resolution, the device will automatically select the right one for its screen settings
More info here:
http://developer.android.com/guide/practices/screens_support.html
under "Resource directory qualifiers for screen size and density"
I searched for this answer because I had a similar situation in VS2013. In my case, I found that a simple "Clean Solution
" cleared out all the old definitions.
I don't know if this still is an issue, but i prefere just to use the My.Settings in my code.
Visual Studio generates a simple class with functions for reading settings from the app.config file.
You can simply access it using My.Settings.ConnectionString.
Using Context As New Data.Context.DataClasses()
Context.Connection.ConnectionString = My.Settings.ConnectionString
End Using
simply include parsley.js file in your document and in input element of mobile number enter this
data-parsley-type= "number" data-parsley-length="[10,10]" data-parsley-length-message= "Enter a Mobile Number"
you can change the message according to your requirement you also need to initialize parsley.js file in your document by writing
<script type="text/javascript">
$(document).ready(function() {
$('form').parsley();
});
</script>
---above code in your document.***
You can use the function stat.desc from pastec package.
library(pastec)
stat.desc(x, BASIC =TRUE, NORMAL =TRUE)
you can find more about it from here: https://www.rdocumentation.org/packages/pastecs/versions/1.3.21/topics/stat.desc
Use putty. Put install directory path in environment values (PATH), and restart your PC if required.
Open cmd (command prompt) and type
C:/> pscp "C:\Users/gsjha/Desktop/example.txt" user@host:/home/
It'll be copied to the system.
I think you're using less-well-supported Unicode values, which don't always have glyphs for all the code points.
Try the following characters:
☐
]): an empty (unchecked) checkbox☑
]): the checked version of the previous checkbox✓
])✔
])Edit: There seems to be some confusion about the first symbol here, ? / 0x2610. This is an empty (unchecked) checkbox, so if you see a box, that's the way it's supposed to look. It's the counterpart to ? / 0x2611, which is the checked version.
After running into this issue myself, on a huge database, I wasn't completely impressed with the performance of any of the other answers. I want to keep only the latest duplicate row, and delete the rest.
In a one-query statement, without a temp table, this worked best for me,
DELETE e.*
FROM employee e
WHERE id IN
(SELECT id
FROM (SELECT MIN(id) as id
FROM employee e2
GROUP BY first_name, last_name
HAVING COUNT(*) > 1) x);
The only caveat is that I have to run the query multiple times, but even with that, I found it worked better for me than the other options.
Chrome uses (a fork of) Webkit if you didn't know, which is also used by Safari. Here's a few questions that are of the same vein:
The webkit one isn't great as the other answer states, one version no longer works (the google code one) and the Mono one is experimental. It'd be nice if someone made the effort to make a decent .NET wrapper for it but it's not something anyone seems to want to do - which is surprising given it now has support for HTML5 and so many other features that the IE(8) engine lacks.
Update (2014)
There's new dual-licensed project that allows you embed Chrome into your .NET applications called Awesomium. It comes with a .NET api but requires quite a few hacks for rendering (the examples draw the browser window to a buffer, paint the buffer as an image and refresh on a timer).
I think this is the browser used by Origin in Battlefield 3.
Update (2016)
There is now DotnetBrowser, a commercial alternative to Awesomium. It's based off Chromium.
You should design your table WITHOUT considering the views.
Apart from saving joins and conditions, Views do have a performance advantage: SQL Server may calculate and save its execution plan in the view, and therefore make it faster than "on the fly" SQL statements.
View may also ease your work regarding user access at field level.
If you are using a GNU compiler, the compiler can assemble a list of dependencies for you. Makefile fragment:
depend: .depend
.depend: $(SRCS)
rm -f "$@"
$(CC) $(CFLAGS) -MM $^ -MF "$@"
include .depend
or
depend: .depend
.depend: $(SRCS)
rm -f "$@"
$(CC) $(CFLAGS) -MM $^ > "$@"
include .depend
where SRCS
is a variable pointing to your entire list of source files.
There is also the tool makedepend
, but I never liked it as much as gcc -MM
I had this same issue when running from Eclipse. To fix the issue I went into the Configure Build Path and removed the src folder from the build path. Then closed and reopened the project. Then I added the src folder to the build path. The src folder contained the java class I was trying to access.
string apppath =
(new System.IO.FileInfo
(System.Reflection.Assembly.GetExecutingAssembly().CodeBase)).DirectoryName;
The tabularx
package gives you
X
, all X
columns will grow to fill up the total width.For your example:
\usepackage{tabularx}
% ...
\begin{document}
% ...
\begin{tabularx}{\textwidth}{|X|X|X|}
\hline
Input & Output& Action return \\
\hline
\hline
DNF & simulation & jsp\\
\hline
\end{tabularx}
You can do like below to achieve your result:
import seaborn as sns
import matplotlib.pyplot as plt
import pandas as pd
import numpy as np
....
....
#use filter with plot
#or
fg=sns.factorplot('Retailer country', data=df1[(df1['Retailer country']=='United States') | (df1['Retailer country']=='France')], kind='count')
fg.set_xlabels('Retailer country')
plt.show()
#also
#and
fg=sns.factorplot('Retailer country', data=df1[(df1['Retailer country']=='United States') & (df1['Year']=='2013')], kind='count')
fg.set_xlabels('Retailer country')
plt.show()
The two methods are 100% equivalent.
I’m not sure why Microsoft felt the need to include this extra Clear
method but since it’s there, I recommend using it, as it clearly expresses its purpose.
As of kotlin 1.2, you could write:
(1..3).shuffled().last()
Just be aware it's big O(n), but for a small list (especially of unique values) it's alright :D
I'd like to complement Mithilesh Izardar's answer:
Indeed the best approach is simply to "Drag and Drop", which afterwards you can find the files in the emulator at Settings ? Storage ? Internal Storage ? Explore ? Download
(API 25).
The problem for me was that after following these steps the pics weren't appearing neither in the "Gallery" nor in the "Downloads" (by simply clicking the "Downloads" icon).
The reason for this is because by default everything in the emulator has no permissions...so all you gotta do is give the "Gallery" storage permission: Settings ? Apps ? Gallery ? Permissions
(API 25)
Ps: If you just copied the pictures, the new ones won't show up right away. You should either restart the emulator, or remount the sdcard (at Settings ? Storage
unmount the sdcard by clicking the eject icon then remount it)
Might be your project is not JEE nature, to do this Right Click -> Properties -> Project Facets and click Convert to facet and check dynamic web module and ok. Now you will be able to see Java EE Tools.
Instead of Find & Replace, you can right click the namespace in code and Refactor -> Rename.
Thanks to @Jimmy for this.
Let me explain a little more by my example.
Task: correct info, where abiturients (students about to leave secondary school) have submitted applications to university earlier, than they got school certificates (yes, they got certificates earlier, than they were issued (by certificate date specified). So, we will increase application submit date to fit certificate issue date.
Thus. next MySQL-like statement:
UPDATE applications a
JOIN (
SELECT ap.id, ab.certificate_issued_at
FROM abiturients ab
JOIN applications ap
ON ab.id = ap.abiturient_id
WHERE ap.documents_taken_at::date < ab.certificate_issued_at
) b
ON a.id = b.id
SET a.documents_taken_at = b.certificate_issued_at;
Becomes PostgreSQL-like in such a way
UPDATE applications a
SET documents_taken_at = b.certificate_issued_at -- we can reference joined table here
FROM abiturients b -- joined table
WHERE
a.abiturient_id = b.id AND -- JOIN ON clause
a.documents_taken_at::date < b.certificate_issued_at -- Subquery WHERE
As you can see, original subquery JOIN
's ON
clause have become one of WHERE
conditions, which is conjucted by AND
with others, which have been moved from subquery with no changes. And there is no more need to JOIN
table with itself (as it was in subquery).
So I can tell there aren't enough opinions or reinvented wheels in this thread, so I decided to spice things up.
Below is a procedure that:
CREATE OR REPLACE PROCEDURE pg_reset_all_table_sequences(
IN commit_mode BOOLEAN DEFAULT FALSE
, IN mask_in TEXT DEFAULT NULL
) AS
$$
DECLARE
sql_reset TEXT;
each_sec RECORD;
new_val TEXT;
BEGIN
sql_reset :=
$sql$
SELECT setval(pg_get_serial_sequence('%1$s.%2$s', '%3$s'), coalesce(max("%3$s"), %4$s), false) FROM %1$s.%2$s;
$sql$
;
FOR each_sec IN (
SELECT
quote_ident(table_schema) as table_schema
, quote_ident(table_name) as table_name
, column_name
, coalesce(identity_start::INT, seqstart) as min_val
FROM information_schema.columns
JOIN pg_sequence ON seqrelid = pg_get_serial_sequence(quote_ident(table_schema)||'.'||quote_ident(table_name) , column_name)::regclass
WHERE
(is_identity::boolean OR column_default LIKE 'nextval%') -- catches both SERIAL and IDENTITY sequences
-- mask on column address (schema.table.column) if supplied
AND coalesce( table_schema||'.'||table_name||'.'||column_name = mask_in, TRUE )
)
LOOP
IF commit_mode THEN
EXECUTE format(sql_reset, each_sec.table_schema, each_sec.table_name, each_sec.column_name, each_sec.min_val) INTO new_val;
RAISE INFO 'Resetting sequence for: %.% (%) to %'
, each_sec.table_schema
, each_sec.table_name
, each_sec.column_name
, new_val
;
ELSE
RAISE INFO 'Sequence found for resetting: %.% (%)'
, each_sec.table_schema
, each_sec.table_name
, each_sec.column_name
;
END IF
;
END LOOP;
END
$$
LANGUAGE plpgsql
;
to preview:
call pg_reset_all_table_sequences();
to commit:
call pg_reset_all_table_sequences(true);
to specify only your target table:
call pg_reset_all_table_sequences('schema.table.column');
Using the Property window
Select form ? go to property window ? select "start position" ? select whatever the place you want.
Programmatically
Form form1 = new Form();
form1.StartPosition = FormStartPosition.CenterScreen;
form1.ShowDialog();
Note: Do not directly call Form.CenterToScreen() from your code. Read here.
Problem is that while runtime generic type is erased so new E[10]
would be equivalent to new Object[10]
.
This would be dangerous because it would be possible to put in array other data than of E
type. That is why you need to explicitly say that type you want by either
E[]
array, or componentType
argiment.With:
global index_add_counter
You are not defining, just declaring so it's like saying there is a global index_add_counter
variable elsewhere, and not create a global called index_add_counter
. As you name don't exists, Python is telling you it can not import that name. So you need to simply remove the global
keyword and initialize your variable:
index_add_counter = 0
Now you can import it with:
from app import index_add_counter
The construction:
global index_add_counter
is used inside modules' definitions to force the interpreter to look for that name in the modules' scope, not in the definition one:
index_add_counter = 0
def test():
global index_add_counter # means: in this scope, use the global name
print(index_add_counter)
To make use of regular expressions directly in Excel formulas the following UDF (user defined function) can be of help. It more or less directly exposes regular expression functionality as an excel function.
It takes 2-3 parameters.
$0
, $1
, $2
, and so on. $0
is the entire match, $1
and up correspond to the respective match groups in the regular expression. Defaults to $0
.Extracting an email address:
=regex("Peter Gordon: [email protected], 47", "\w+@\w+\.\w+")
=regex("Peter Gordon: [email protected], 47", "\w+@\w+\.\w+", "$0")
Results in: [email protected]
Extracting several substrings:
=regex("Peter Gordon: [email protected], 47", "^(.+): (.+), (\d+)$", "E-Mail: $2, Name: $1")
Results in: E-Mail: [email protected], Name: Peter Gordon
To take apart a combined string in a single cell into its components in multiple cells:
=regex("Peter Gordon: [email protected], 47", "^(.+): (.+), (\d+)$", "$" & 1)
=regex("Peter Gordon: [email protected], 47", "^(.+): (.+), (\d+)$", "$" & 2)
Results in: Peter Gordon
[email protected]
...
To use this UDF do the following (roughly based on this Microsoft page. They have some good additional info there!):
ALT+F11
to open the Microsoft Visual Basic for Applications Editor.Click on Insert Module. If you give your module a different name make sure the Module does not have the same name as the UDF below (e.g. naming the Module Regex
and the function regex
causes #NAME! errors).
In the big text window in the middle insert the following:
Function regex(strInput As String, matchPattern As String, Optional ByVal outputPattern As String = "$0") As Variant
Dim inputRegexObj As New VBScript_RegExp_55.RegExp, outputRegexObj As New VBScript_RegExp_55.RegExp, outReplaceRegexObj As New VBScript_RegExp_55.RegExp
Dim inputMatches As Object, replaceMatches As Object, replaceMatch As Object
Dim replaceNumber As Integer
With inputRegexObj
.Global = True
.MultiLine = True
.IgnoreCase = False
.Pattern = matchPattern
End With
With outputRegexObj
.Global = True
.MultiLine = True
.IgnoreCase = False
.Pattern = "\$(\d+)"
End With
With outReplaceRegexObj
.Global = True
.MultiLine = True
.IgnoreCase = False
End With
Set inputMatches = inputRegexObj.Execute(strInput)
If inputMatches.Count = 0 Then
regex = False
Else
Set replaceMatches = outputRegexObj.Execute(outputPattern)
For Each replaceMatch In replaceMatches
replaceNumber = replaceMatch.SubMatches(0)
outReplaceRegexObj.Pattern = "\$" & replaceNumber
If replaceNumber = 0 Then
outputPattern = outReplaceRegexObj.Replace(outputPattern, inputMatches(0).Value)
Else
If replaceNumber > inputMatches(0).SubMatches.Count Then
'regex = "A to high $ tag found. Largest allowed is $" & inputMatches(0).SubMatches.Count & "."
regex = CVErr(xlErrValue)
Exit Function
Else
outputPattern = outReplaceRegexObj.Replace(outputPattern, inputMatches(0).SubMatches(replaceNumber - 1))
End If
End If
Next
regex = outputPattern
End If
End Function
Save and close the Microsoft Visual Basic for Applications Editor window.
here's a pure Javascript alternative:
var mydiv = document.getElementById("myDiv");
var aTag = document.createElement('a');
aTag.setAttribute('href',"yourlink.htm");
aTag.innerText = "link text";
mydiv.appendChild(aTag);
For Linux You can also use /proc/self/statm to get a single line of numbers containing key process memory information which is a faster thing to process than going through a long list of reported information as you get from proc/self/status
See http://man7.org/linux/man-pages/man5/proc.5.html
/proc/[pid]/statm
Provides information about memory usage, measured in pages.
The columns are:
size (1) total program size
(same as VmSize in /proc/[pid]/status)
resident (2) resident set size
(same as VmRSS in /proc/[pid]/status)
shared (3) number of resident shared pages (i.e., backed by a file)
(same as RssFile+RssShmem in /proc/[pid]/status)
text (4) text (code)
lib (5) library (unused since Linux 2.6; always 0)
data (6) data + stack
dt (7) dirty pages (unused since Linux 2.6; always 0)
it is Cross-site scripting problem. Common modern browsers doesn't allow to send request to another url.
module Enumerable
def map_with_index(&block)
i = 0
self.map { |val|
val = block.call(val, i)
i += 1
val
}
end
end
["foo", "bar"].map_with_index {|item, index| [item, index] } => [["foo", 0], ["bar", 1]]
This works properly in my case:
Drawable drawable = ContextCompat.getDrawable(getApplicationContext(),
R.drawable.change_pass);
toolbar.setOverflowIcon(drawable);
Assign position:relative
to .outside
, and then position:absolute; bottom:0;
to your .inside
.
Like so:
.outside {
position:relative;
}
.inside {
position: absolute;
bottom: 0;
}
Your tables should have as immediate children just tbody
and thead
elements, with the rows within*. So, amend the HTML to be:
<table border="1" width="100%" id="test">
<tbody>
<tr>
<td>
<table border="1" width="100%">
<tbody>
<tr>
<td>table 2</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr><td>table 1</td></tr>
<tr><td>table 1</td></tr>
<tr><td>table 1</td></tr>
</tbody>
</table>
Then amend your selector slightly to this:
#test > tbody > tr:last-child { background:#ff0000; }
See it in action here. That makes use of the child selector, which:
...separates two selectors and matches only those elements matched by the second selector that are direct children of elements matched by the first.
So, you are targeting only direct children of tbody
elements that are themselves direct children of your #test
table.
The above is the neatest solution, as you don't need to over-ride any styles. The alternative would be to stick with your current set-up, and over-ride the background style for the inner table, like this:
#test tr:last-child { background:#ff0000; }
#test table tr:last-child { background:transparent; }
* It's not mandatory but most (all?) browsers will add these in, so it's best to make it explicit. As @BoltClock states in the comments:
...it's now set in stone in HTML5, so for a browser to be compliant it basically must behave this way.
length
and dbms_lob.getlength
return the number of characters when applied to a CLOB (Character LOB). When applied to a BLOB (Binary LOB), dbms_lob.getlength
will return the number of bytes, which may differ from the number of characters in a multi-byte character set.
As the documentation doesn't specify what happens when you apply length
on a BLOB, I would advise against using it in that case. If you want the number of bytes in a BLOB, use dbms_lob.getlength
.
I had the same issue, but I have just figured out that :
My code:
package com.example.herodav.volumeapp;
import android.renderscript.Double2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.*;
import android.widget.*;
import org.w3c.dom.Text;
public class MainActivity extends AppCompatActivity {
EditText height, length, depth;
TextView volume;
double h,l,d,vol;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
height = (EditText)findViewById(R.id.h);
length = (EditText)findViewById(R.id.l);
depth = (EditText)findViewById(R.id.d);
volume = (TextView)findViewById(R.id.v);
Button btn = (Button)findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calculateVolume();
volume.setText("Volume = " + String.valueOf(vol));
}
});
}
public void calculateVolume(){
h = Double.parseDouble(height.getText().toString());
l = Double.parseDouble(length.getText().toString());
d = Double.parseDouble(depth.getText().toString());
vol = h*l*d;
}
}
I
Incase data size is small, R has many packages and functions which can be utilized as per your requirement.
write.xlsx, write.xlsx2, XLconnect also do the work but these are sometimes slow as compare to openxlsx.
So, if you are dealing with the large data sets and came across java errors. I would suggest to have a look of "openxlsx" which is really awesome and reduce the time to 1/12th.
I've tested all and finally i was really impressed with the performance of openxlsx capabilities.
Here are the steps for writing multiple datasets into multiple sheets.
install.packages("openxlsx")
library("openxlsx")
start.time <- Sys.time()
# Creating large data frame
x <- as.data.frame(matrix(1:4000000,200000,20))
y <- as.data.frame(matrix(1:4000000,200000,20))
z <- as.data.frame(matrix(1:4000000,200000,20))
# Creating a workbook
wb <- createWorkbook("Example.xlsx")
Sys.setenv("R_ZIPCMD" = "C:/Rtools/bin/zip.exe") ## path to zip.exe
Sys.setenv("R_ZIPCMD" = "C:/Rtools/bin/zip.exe") has to be static as it takes reference of some utility from Rtools.
Note: Incase Rtools is not installed on your system, please install it first for smooth experience. here is the link for your reference: (choose appropriate version)
https://cran.r-project.org/bin/windows/Rtools/ check the options as per link below (need to select all the check box while installation)
https://cloud.githubusercontent.com/assets/7400673/12230758/99fb2202-b8a6-11e5-82e6-836159440831.png
# Adding a worksheets : parameters for addWorksheet are 1. Workbook Name 2. Sheet Name
addWorksheet(wb, "Sheet 1")
addWorksheet(wb, "Sheet 2")
addWorksheet(wb, "Sheet 3")
# Writing data in to respetive sheets: parameters for writeData are 1. Workbook Name 2. Sheet index/ sheet name 3. dataframe name
writeData(wb, 1, x)
# incase you would like to write sheet with filter available for ease of access you can pass the parameter withFilter = TRUE in writeData function.
writeData(wb, 2, x = y, withFilter = TRUE)
## Similarly writeDataTable is another way for representing your data with table formatting:
writeDataTable(wb, 3, z)
saveWorkbook(wb, file = "Example.xlsx", overwrite = TRUE)
end.time <- Sys.time()
time.taken <- end.time - start.time
time.taken
openxlsx package is really good for reading and writing huge data from/ in excel files and has lots of options for custom formatting within excel.
The interesting fact is that we dont have to bother about java heap memory here.
You can retrieve the series through slicing your dataframe using one of these two methods:
http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.iloc.html http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.loc.html
import pandas as pd
import numpy as np
df = pd.DataFrame(data=np.random.randn(1,8))
series1=df.iloc[0,:]
type(series1)
pandas.core.series.Series
If you're on Python 2.5 or earlier, open the file and then use the file object in your redirection:
log = open("c:\\goat.txt", "w")
print >>log, "test"
If you're on Python 2.6 or 2.7, you can use print as a function:
from __future__ import print_function
log = open("c:\\goat.txt", "w")
print("test", file = log)
If you're on Python 3.0 or later, then you can omit the future import.
If you want to globally redirect your print statements, you can set sys.stdout:
import sys
sys.stdout = open("c:\\goat.txt", "w")
print ("test sys.stdout")
Change this line:
mMyListView.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
listItems));
to:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
listItems)
mMyListView.setAdapter(adapter);
and after updating the value of a list item, call:
adapter.notifyDataSetChanged();
I made a small library that lets you easily use a throbber without images.
It uses CSS3 but falls back onto JavaScript if the browser doesn't support it.
// First argument is a reference to a container element in which you
// wish to add a throbber to.
// Second argument is the duration in which you want the throbber to
// complete one full circle.
var throbber = throbbage(document.getElementById("container"), 1000);
// Start the throbber.
throbber.play();
// Pause the throbber.
throbber.pause();
document.getElementById('username').value = 'foo';
document.getElementById('login_form').submit();
Here is a example of embedding without an iFrame:
<div style="width: 560px; height: 315px; float: none; clear: both; margin: 2px auto;">
<embed
src="https://www.youtube.com/embed/J---aiyznGQ?autohide=1&autoplay=1"
wmode="transparent"
type="video/mp4"
width="100%" height="100%"
allow="autoplay; encrypted-media; picture-in-picture"
allowfullscreen
title="Keyboard Cat"
>
</div>
_x000D_
compare to regular iframe "embed" code from YouTube:
<iframe
width="560"
height="315"
src="https://www.youtube.com/embed/J---aiyznGQ?autoplay=1"
frameborder="0"
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
allowfullscreen>
</iframe>
_x000D_
and as far as HTML5 goes, use <object>
tag like so (corrected):
<object
style="width: 820px; height: 461.25px; float: none; clear: both; margin: 2px auto;"
data="http://www.youtube.com/embed/J---aiyznGQ?autoplay=1">
</object>
_x000D_
Example 1: A JVM runs in a single process and threads in a JVM share the heap belonging to that process. That is why several threads may access the same object. Threads share the heap and have their own stack space. This is how one thread’s invocation of a method and its local variables are kept thread safe from other threads. But the heap is not thread-safe and must be synchronized for thread safety.
tags = [u'man', u'you', u'are', u'awesome']
entries = [[u'man', u'thats'],[ u'right',u'awesome']]
result = []
[result.extend(entry) for tag in tags for entry in entries if tag in entry]
print(result)
Output:
['man', 'thats', 'right', 'awesome']
I go with Mark Longair's solution and comments and recommend anyone reads those before acting, but I'd suggest the emphasis should be on
git branch -f <branchname> <commit>
Here is a scenario where I have needed to do this.
Develop on the wrong branch and hence need to reset it.
Cleanly develop and release some software.
Mistake: Accidentally stay on the release branch while developing further.
"OH NO! I accidentally developed on the release branch." The workspace is maybe cluttered with half changed files that represent work-in-progress and we really don't want to touch and mess with. We'd just like git to flip a few pointers to keep track of the current state and put that release branch back how it should be.
Create a branch for the development that is up to date holding the work committed so far and switch to it.
git branch development
git checkout development
Now we are in the problem situation and need its solution! Rectify the mistake (of taking the release branch forward with the development) and put the release branch back how it should be.
Correct the release branch to point back to the last real release.
git branch -f release release2
The release branch is now correct again, like this ...
git push -f <remote> <branch>
is well described in another thread, though the word "overwrite" in the title is misleading.
Force "git push" to overwrite remote files
Solution: Edit and save the file!
From VisualStudio go to the View and expand to see it's resx file
Right-click menu select OpenWith... XML (Text) Editor.
Just add a space at the end and save.
check your casing, the name is typically stored in upper case
SELECT * FROM all_source WHERE name = 'DAILY_UPDATE' ORDER BY TYPE, LINE;
Scripts are usually interpreted (by another executable).
A program is usually a standalone compiled executable in its own right (although it might have library dependencies), consisting of machine code or byte codes (for just-in-time compiled programs)
Try this if you want to restrict the lines up to 3 and after three lines the dots will appear. If we want to increase the lines just change the -webkit-line-clamp value and give the width for div size.
div {
display: -webkit-box;
-webkit-line-clamp: 3;
-webkit-box-orient: vertical;
overflow: hidden;
text-overflow: ellipsis;
}
The other answers are just fine, but I wanted to point out one other peripheral thing: Arrays are ordered, whereas Hashes are not in 1.8. (In Ruby 1.9, Hashes are ordered by insertion order of keys.) So it wouldn't make sense prior to 1.9 to iterate over a Hash in the same way/sequence as Arrays, which have always had a definite ordering. I don't know what the default order is for PHP associative arrays (apparently my google fu isn't strong enough to figure that out, either), but I don't know how you can consider regular PHP arrays and PHP associative arrays to be "the same" in this context, since the order for associative arrays seems undefined.
As such, the Ruby way seems more clear and intuitive to me. :)
On CodeProject, there is an article that briefly discusses pros and cons of testing private methods. It then provides some reflection code to access private methods (similar to the code Marcus provides above.) The only issue I've found with the sample is that the code doesn't take into account overloaded methods.
You can find the article here:
In my case, this problem was solved by clicking 'Kernel' (shown on the top of notebooks) and then 'Reconnect'.
Note Added: In some versions of Jupyter, there is not 'Reconnect'.
You only need to write
seamless
in your code. There is not need for:
seamless ="seamless"
I just found this out myself.
EDIT - this does not remove scrollbars. Strangely
scrolling="no" still seems to work in html5. I have tried using the overflow function with an inline style as recommended by html5 but this doesn't work for me.
I have tried with almost 5+ different android approaches and found this is the best solution provided by google especially for android:
try {
HttpURLConnection urlConnection = (HttpURLConnection)
(new URL("http://clients3.google.com/generate_204")
.openConnection());
urlConnection.setRequestProperty("User-Agent", "Android");
urlConnection.setRequestProperty("Connection", "close");
urlConnection.setConnectTimeout(1500);
urlConnection.connect();
if (urlConnection.getResponseCode() == 204 &&
urlConnection.getContentLength() == 0) {
Log.d("Network Checker", "Successfully connected to internet");
return true;
}
} catch (IOException e) {
Log.e("Network Checker", "Error checking internet connection", e);
}
It's faster
, efficient
and accurate
than any other available solution.
Export should be specific about which version of GCC/G++ to use, because if user had multiple compiler version, it would not compile successfully.
export CC=path_of_gcc/gcc-version
export CXX=path_of_g++/g++-version
cmake path_of_project_contain_CMakeList.txt
make
In case project use C++11 this can be handled by using -std=C++-11
flag in CMakeList.txt
I faced a bit of a different issue that returned the same error.
Skipping JaCoCo execution due to missing execution data /target/jacoco.exec
The truth is, this error is returned for many, many reasons. We experimented with the different solutions on Stack Overflow, but found this resource to be best. It tears down the many different potential reasons why Jacoco could be returning the same error.
For us, the solution was to add a prepare-agent to the configuration.
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
I would imagine most users will be experiencing it for different reasons, so take a look at the aforementioned resource!
The limit is dependent on both the server and the client used (and if applicable, also the proxy the server or the client is using).
Most web servers have a limit of 8192 bytes (8 KB), which is usually configurable somewhere in the server configuration. As to the client side matter, the HTTP 1.1 specification even warns about this. Here's an extract of chapter 3.2.1:
Note: Servers ought to be cautious about depending on URI lengths above 255 bytes, because some older client or proxy implementations might not properly support these lengths.
The limit in Internet Explorer and Safari is about 2 KB, in Opera about 4 KB and in Firefox about 8 KB. We may thus assume that 8 KB is the maximum possible length and that 2 KB is a more affordable length to rely on at the server side and that 255 bytes is the safest length to assume that the entire URL will come in.
If the limit is exceeded in either the browser or the server, most will just truncate the characters outside the limit without any warning. Some servers however may send an HTTP 414 error.
If you need to send large data, then better use POST instead of GET. Its limit is much higher, but more dependent on the server used than the client. Usually up to around 2 GB is allowed by the average web server.
This is also configurable somewhere in the server settings. The average server will display a server-specific error/exception when the POST limit is exceeded, usually as an HTTP 500 error.
Mby bootstrap img-responsive
class is you looking for.
Here is the answer I gave to a similar question, Simple, easy, works pretty good and does not require anything else than what you already have with Visual Studio.
As others have responded already Clean will remove all artifacts that are generated by the build. But it will leave behind everything else.
If you have some customizations in your MSBuild project this could spell trouble and leave behind stuff you would think it should have deleted.
You can circumvent this problem with a simple change to your .*proj by adding this somewhere near the end :
<Target Name="SpicNSpan"
AfterTargets="Clean">
<RemoveDir Directories="$(OUTDIR)"/>
</Target>
Which will remove everything in your bin folder of the current platform/configuration.
Do simply like below....
HashMap<String,Object> yourHash = new HashMap<String,Object>();
yourHash.put(yourKey+"message","message");
yourHash.put(yourKey+"timestamp",timestamp);
yourHash.put(yourKey+"count ",count);
yourHash.put(yourKey+"version ",version);
typecast the value while getting back. For ex:
int count = Integer.parseInt(yourHash.get(yourKey+"count"));
//or
int count = Integer.valueOf(yourHash.get(yourKey+"count"));
//or
int count = (Integer)yourHash.get(yourKey+"count"); //or (int)
I've found this to work:
var element1 = document.createElement("input");
element1.type = "hidden";
element1.value = "10";
element1.name = "a";
document.getElementById("chells").appendChild(element1);
Nothing of the above helped me but setting:
-Djava.net.preferIPv4Stack=true
as VM Argument in the VM Arguments tab of the Tomcat Server Debug Configuration Settings solved the problem. (Tomcat 8, Windows 10, Eclipse Mars)
CONTROL + SHIFT + P and execute command "Tree View: Show"
I usually use
#define INFINITY (1e999)
or
const double INFINITY = 1e999
which works at least in IEEE 754 contexts because the highest representable double value is roughly 1e308
. 1e309
would work just as well, as would 1e99999
, but three nines is sufficient and memorable. Since this is either a double literal (in the #define
case) or an actual Inf
value, it will remain infinite even if you're using 128-bit (“long double”) floats.
[UPDATE] ==============================================================
Respect to the [OLD] answer here below, I have discovered that it worked because I have put all the numbers in a single atomic vector; one of them was a character, so every one become characters.
If we use a list (hence, coercion does not happen) all the test pass correctly but one: 1/(1 - 0.98)
, which remains a numeric
. This because the tol
parameter is by default 100 * .Machine$double.eps
and that number is far from 50
little less than the double of that. So, basically, for this kind of numbers, we have to decide our tolerance!
So if you want all test became TRUE
, you can assertive::is_whole_number(x, tol = 200 * .Machine$double.eps)
Anyway, I confirm that IMO assertive remains the best solution.
Here below a reprex for this [UPDATE].
expect_trues_c <- c(
cl = sqrt(2)^2,
pp = 9.0,
t = 1 / (1 - 0.98),
ar0 = 66L,
ar1 = 66,
ar2 = 1 + 2^-50,
v = 222e3,
w1 = 1e4,
w2 = 1e5,
v2 = "1000000000000000000000000000000000001",
an = 2 / 49 * 49,
ju1 = 1e22,
ju2 = 1e24,
al = floor(1),
v5 = 1.0000000000000001 # this is under machine precision!
)
str(expect_trues_c)
#> Named chr [1:15] "2" "9" "50" "66" "66" "1" "222000" "10000" "1e+05" ...
#> - attr(*, "names")= chr [1:15] "cl" "pp" "t" "ar0" ...
assertive::is_whole_number(expect_trues_c)
#> Warning: Coercing expect_trues_c to class 'numeric'.
#> 2 9 50
#> TRUE TRUE TRUE
#> 66 66 1
#> TRUE TRUE TRUE
#> 222000 10000 100000
#> TRUE TRUE TRUE
#> 1e+36 2 1e+22
#> TRUE TRUE TRUE
#> 9.9999999999999998e+23 1 1
#> TRUE TRUE TRUE
expect_trues_l <- list(
cl = sqrt(2)^2,
pp = 9.0,
t = 1 / (1 - 0.98),
ar0 = 66L,
ar1 = 66,
ar2 = 1 + 2^-50,
v = 222e3,
w1 = 1e4,
w2 = 1e5,
v2 = "1000000000000000000000000000000000001",
an = 2 / 49 * 49,
ju1 = 1e22,
ju2 = 1e24,
al = floor(1),
v5 = 1.0000000000000001 # this is under machine precision!
)
str(expect_trues_l)
#> List of 15
#> $ cl : num 2
#> $ pp : num 9
#> $ t : num 50
#> $ ar0: int 66
#> $ ar1: num 66
#> $ ar2: num 1
#> $ v : num 222000
#> $ w1 : num 10000
#> $ w2 : num 1e+05
#> $ v2 : chr "1000000000000000000000000000000000001"
#> $ an : num 2
#> $ ju1: num 1e+22
#> $ ju2: num 1e+24
#> $ al : num 1
#> $ v5 : num 1
assertive::is_whole_number(expect_trues_l)
#> Warning: Coercing expect_trues_l to class 'numeric'.
#> There was 1 failure:
#> Position Value Cause
#> 1 3 49.999999999999957 fractional
assertive::is_whole_number(expect_trues_l, tol = 200 * .Machine$double.eps)
#> Warning: Coercing expect_trues_l to class 'numeric'.
#> 2.0000000000000004 9 49.999999999999957
#> TRUE TRUE TRUE
#> 66 66 1.0000000000000009
#> TRUE TRUE TRUE
#> 222000 10000 100000
#> TRUE TRUE TRUE
#> 1e+36 1.9999999999999998 1e+22
#> TRUE TRUE TRUE
#> 9.9999999999999998e+23 1 1
#> TRUE TRUE TRUE
expect_falses <- list(
bb = 5 - 1e-8,
pt1 = 1.0000001,
pt2 = 1.00000001,
v3 = 3243.34,
v4 = "sdfds"
)
str(expect_falses)
#> List of 5
#> $ bb : num 5
#> $ pt1: num 1
#> $ pt2: num 1
#> $ v3 : num 3243
#> $ v4 : chr "sdfds"
assertive::is_whole_number(expect_falses)
#> Warning: Coercing expect_falses to class 'numeric'.
#> Warning in as.this_class(x): NAs introduced by coercion
#> There were 5 failures:
#> Position Value Cause
#> 1 1 4.9999999900000001 fractional
#> 2 2 1.0000001000000001 fractional
#> 3 3 1.0000000099999999 fractional
#> 4 4 3243.3400000000001 fractional
#> 5 5 <NA> missing
assertive::is_whole_number(expect_falses, tol = 200 * .Machine$double.eps)
#> Warning: Coercing expect_falses to class 'numeric'.
#> Warning: NAs introduced by coercion
#> There were 5 failures:
#> Position Value Cause
#> 1 1 4.9999999900000001 fractional
#> 2 2 1.0000001000000001 fractional
#> 3 3 1.0000000099999999 fractional
#> 4 4 3243.3400000000001 fractional
#> 5 5 <NA> missing
Created on 2019-07-23 by the reprex package (v0.3.0)
[OLD] =================================================================
IMO the best solution comes from the assertive
package (which, for the moment, solve all positive and negative examples in this thread):
are_all_whole_numbers <- function(x) {
all(assertive::is_whole_number(x), na.rm = TRUE)
}
are_all_whole_numbers(c(
cl = sqrt(2)^2,
pp = 9.0,
t = 1 / (1 - 0.98),
ar0 = 66L,
ar1 = 66,
ar2 = 1 + 2^-50,
v = 222e3,
w1 = 1e4,
w2 = 1e5,
v2 = "1000000000000000000000000000000000001",
an = 2 / 49 * 49,
ju1 = 1e22,
ju2 = 1e24,
al = floor(1),
v5 = 1.0000000000000001 # difference is under machine precision!
))
#> Warning: Coercing x to class 'numeric'.
#> [1] TRUE
are_all_not_whole_numbers <- function(x) {
all(!assertive::is_whole_number(x), na.rm = TRUE)
}
are_all_not_whole_numbers(c(
bb = 5 - 1e-8,
pt1 = 1.0000001,
pt2 = 1.00000001,
v3 = 3243.34,
v4 = "sdfds"
))
#> Warning: Coercing x to class 'numeric'.
#> Warning in as.this_class(x): NAs introduced by coercion
#> [1] TRUE
Created on 2019-07-23 by the reprex package (v0.3.0)
Alternatively, you can start output buffering, do an include/require, and then stop buffering. With ob_get_contents(), you can just get the stuff that was outputted by that other PHP file into a variable.
If this problem is still flummoxing you and you are developing using Eclipse, have a look at this Eclipse bug: Resources files from "src/main/resources" are not correctly included in classpath
Solution seems to be look at properties of project, Java build path, source folders. Delete the /src/main/resources
dir and add it again. This causes Eclipse to be reminded it needs to copy these files to the classpath.
This bug affected me when using the "Neon" release of Eclipse. (And was very frustrating until I realized the simple fix just described)
The getDay()
method returns a number to indicate the day in week (0=Sun, 1=Mon, ... 6=Sat). Use getDate()
to return a number for the day in month:
var day = convertedStartDate.getDate();
If you like, you can try to add a custom format function to the prototype of the Date
object:
Date.prototype.formatMMDDYYYY = function(){
return (this.getMonth() + 1) +
"/" + this.getDate() +
"/" + this.getFullYear();
}
After doing this, you can call formatMMDDYYY()
on any instance of the Date
object. Of course, this is just a very specific example, and if you really need it, you can write a generic formatting function that would do this based on a formatting string, kinda like java's SimpleDateeFormat (http://java.sun.com/j2se/1.4.2/docs/api/java/text/SimpleDateFormat.html)
(tangent: the Date
object always confuses me... getYear()
vs getFullYear()
, getDate()
vs getDay()
, getDate()
ranges from 1..31, but getMonth()
from 0..11
It's a mess, and I always need to take a peek. http://www.w3schools.com/jsref/jsref_obj_date.asp)
Standing on the shoulders of the other poor creatures trodding through this muck, I was able to follow these steps to get back up and running after an upgrade to Yosemite:
Assuming you've used home-brew to install and upgrade Postgres, you can perform the following steps.
Stop current Postgres server:
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
Initialize a new 9.4 database:
initdb /usr/local/var/postgres9.4 -E utf8
Install postgres 9.3 (as it was no longer present on my machine):
brew install homebrew/versions/postgresql93
Add directories removed during Yosemite upgrade:
mkdir -p /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/touch /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/.keep
run pg_upgrade
:
pg_upgrade -v -d /usr/local/var/postgres -D /usr/local/var/postgres9.4 -b /usr/local/Cellar/postgresql93/9.3.5/bin/ -B /usr/local/Cellar/postgresql/9.4.0/bin/
Move new data into place:
cd /usr/local/var
mv postgres postgres9.3
mv postgres9.4 postgres
Restart Postgres:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
Check /usr/local/var/postgres/server.log
for details and to make sure the new server started properly.
Finally, re-install related libraries?
pip install --upgrade psycopg2
gem uninstall pg
gem install pg
Just set offset for UIBarButtonItem appearance.
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-1000, -1000)
forBarMetrics:UIBarMetricsDefault];
std::copy does the job as far as moving elements is concerned:
#include <algorithm>
std::copy(array+3, array+5, array+2);
Note that the precondition for copy is that the destination must not be in the source range. It's permissible for the ranges to overlap.
Also, because of the way arrays work in C++, this doesn't "shorten" the array. It just shifts elements around within it. There is no way to change the size of an array, but if you're using a separate integer to track its "size" meaning the size of the part you care about, then you can of course decrement that.
So, the array you'll end up with will be as if it were initialized with:
int array[] = {1,2,4,5,5};
Some years have passed and there is now a proper Homebrew Tap for sshpass
, maintained by Aleks Hudochenkov. To install sshpass
from this tap, run:
brew install hudochenkov/sshpass/sshpass
A simple swap is far better for "moving something up" in an ArrayList:
if(i > 0) {
Item toMove = arrayList.get(i);
arrayList.set(i, arrayList.get(i-1));
arrayList.set(i-1, toMove);
}
Because an ArrayList uses an array, if you remove an item from an ArrayList, it has to "shift" all the elements after that item upward to fill in the gap in the array. If you insert an item, it has to shift all the elements after that item to make room to insert it. These shifts can get very expensive if your array is very big. Since you know that you want to end up with the same number of elements in the list, doing a swap like this allows you to "move" an element to another location in the list very efficiently.
As Chris Buckler and Michal Kreuzman point out, there is even a handy method in the Collections class to reduce these three lines of code to one:
Collections.swap(arrayList, i, i-1);
All the above answers not opening image.. when second time I try to open it show the gallery not image.
I got solution from mix of various SO answers..
Intent galleryIntent = new Intent(Intent.ACTION_VIEW, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
galleryIntent.setDataAndType(Uri.fromFile(mImsgeFileName), "image/*");
galleryIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(galleryIntent);
This one only worked for me..
to disable
document.getElementById("btnPlaceOrder").disabled = true;
to enable
document.getElementById("btnPlaceOrder").disabled = false;
So, the idea is to convert character numbers (in single quotes, e.g. '8') to integer expression. For instance char c = '8'; int i = c - '0' //would yield integer 8; And sum up all the converted numbers by the principle that 908=9*100+0*10+8, which is done in a loop.
char t[5] = {'-', '9', '0', '8', '\0'}; //Should be terminated properly.
int s = 1;
int i = -1;
int res = 0;
if (c[0] == '-') {
s = -1;
i = 0;
}
while (c[++i] != '\0') { //iterate until the array end
res = res*10 + (c[i] - '0'); //generating the integer according to read parsed numbers.
}
res = res*s; //answer: -908
Just add
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
to the .htaccess
file in the root of the website you are trying to connect with.
You don't have to always use a weak reference. If your block is not retained, but executed and then discarded, you can capture self strongly, as it will not create a retain cycle. In some cases, you even want the block to hold the self until the completion of the block so it does not deallocate prematurely. If, however, you capture the block strongly, and inside capture self, it will create a retain cycle.
I suggest this ugly method but it works:
length = 1
lenghtafterpadding = 3
newlength = '0' * (lenghtafterpadding - len(str(length))) + str(length)
I came here to find a lighter solution than this one!
RollingFileAppender
does this. You just need to set maxBackupIndex
to the highest value for the backup file.
Your import has a subtle error:
import java.awt.List;
It should be:
import java.util.List;
The problem is that both awt
and Java's util package provide a class called List
. The former is a display element, the latter is a generic type used with collections. Furthermore, java.util.ArrayList
extends java.util.List
, not java.awt.List
so if it wasn't for the generics, it would have still been a problem.
Edit: (to address further questions given by OP) As an answer to your comment, it seems that there is anther subtle import issue.
import org.omg.DynamicAny.NameValuePair;
should be
import org.apache.http.NameValuePair
nameValuePairs
now uses the correct generic type parameter, the generic argument for new UrlEncodedFormEntity
, which is List<? extends NameValuePair>
, becomes valid, since your NameValuePair is now the same as their NameValuePair. Before, org.omg.DynamicAny.NameValuePair
did not extend org.apache.http.NameValuePair
and the shortened type name NameValuePair
evaluated to org.omg...
in your file, but org.apache...
in their code.
In addition to all the great answers here already, I've also used it to walk an item through a series of transformation steps.
If a transformation is implemented as a Func<T,T>
, you can add several transformations to a List<Func<T,T>>
and use Aggregate
to walk an instance of T
through each step.
You want to take a string
value, and walk it through a series of text transformations that could be built programatically.
var transformationPipeLine = new List<Func<string, string>>();
transformationPipeLine.Add((input) => input.Trim());
transformationPipeLine.Add((input) => input.Substring(1));
transformationPipeLine.Add((input) => input.Substring(0, input.Length - 1));
transformationPipeLine.Add((input) => input.ToUpper());
var text = " cat ";
var output = transformationPipeLine.Aggregate(text, (input, transform)=> transform(input));
Console.WriteLine(output);
This will create a chain of transformations: Remove leading and trailing spaces -> remove first character -> remove last character -> convert to upper-case. Steps in this chain can be added, removed, or reordered as needed, to create whatever kind of transformation pipeline is required.
The end result of this specific pipeline, is that " cat "
becomes "A"
.
This can become very powerful once you realize that T
can be anything. This could be used for image transformations, like filters, using BitMap
as an example;
Just Remove the "Target Framework 4.0" and close the bracket.
It will Work
$var = mysql_real_escape_string("data & the base");
$result = mysql_query('SELECT * FROM php_bugs WHERE php_bugs_category like "%' .$var.'%"');
How are you loading this page? Is it getting anything on POST to load? If it's not, then the $name = $_POST['Name']; assignation doesn't have any 'Name' on POST.
As other answers have noted, you cannot change an existing tuple, but you can always create a new tuple (which may take some or all items from existing tuples and/or other sources).
For example, if all the items of interest are in scalar variables and you know the names of those variables:
def maketuple(variables, names):
return tuple(variables[n] for n in names)
to be used, e.g, as in this example:
def example():
x = 23
y = 45
z = 67
return maketuple(vars(), 'x y z'.split())
of course this one case would be more simply expressed as (x, y, z)
(or even foregoing the names altogether, (23, 45, 67)
), but the maketuple
approach might be useful in some more complicated cases (e.g. where the names to use are also determined dynamically and appended to a list during the computation).
Check out this code... hope ur happy :)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<style type="text/css">
<style type="text/css">
*{margin:0;padding:0;}
select {font: normal 13px Arial, SansSerif, Verdana; color: black;}
.wrapper{width:198px; position: relative; height: 20px; overflow: hidden; border-top:1px solid #dddddd; border-left:1px solid #dddddd;}
.Select{color: black; background: #fff;position: absolute; width: 200px; top: -2px; left: -2px;}
optgroup{background-color:#0099CC;color:#ffffff;}
</style>
</head>
<body>
<div class="wrapper">
<select class="Select">
<optgroup label="WebDevelopment"></optgroup>
<option>ASP</option>
<option>PHP</option>
<option>ColdFusion</option>
<optgroup label="Web Design"></optgroup>
<option>Adobe Photoshop</option>
<option>DreamWeaver</option>
<option>CSS</option>
<option>Adobe Flash</option>
</select>
</div>
</body>
</html>
Sajay
`enter code here`#include <stdafx.h> // Used with MS Visual Studio Express. Delete line if using something different
#include <conio.h> // Just for WaitKey() routine
#include <iostream>
#include <string>
#include <windows.h>
using namespace std;
HANDLE console = GetStdHandle(STD_OUTPUT_HANDLE); // For use of SetConsoleTextAttribute()
void WaitKey();
int main()
{
int len = 0,x, y=240; // 240 = white background, black foreground
string text = "Hello World. I feel pretty today!";
len = text.length();
cout << endl << endl << endl << "\t\t"; // start 3 down, 2 tabs, right
for ( x=0;x<len;x++)
{
SetConsoleTextAttribute(console, y); // set color for the next print
cout << text[x];
y++; // add 1 to y, for a new color
if ( y >254) // There are 255 colors. 255 being white on white. Nothing to see. Bypass it
y=240; // if y > 254, start colors back at white background, black chars
Sleep(250); // Pause between letters
}
SetConsoleTextAttribute(console, 15); // set color to black background, white chars
WaitKey(); // Program over, wait for a keypress to close program
}
void WaitKey()
{
cout << endl << endl << endl << "\t\t\tPress any key";
while (_kbhit()) _getch(); // Empty the input buffer
_getch(); // Wait for a key
while (_kbhit()) _getch(); // Empty the input buffer (some keys sends two messages)
}
$.each($('input[type=number]'),function(){
alert($(this).val());
});
This will alert the value of input type number
fields
Demo is present at http://jsfiddle.net/2dJAN/33/
Question has a good pagerank on google, so for anyone who's looking for answer to this question this might be helpful.
There is an extension in google chrome marketspace to do exactly that: https://chrome.google.com/webstore/detail/hccmhjmmfdfncbfpogafcbpaebclgjcp
Jihene Stambouli answered OP question most directly... Question was; why does
for(int i = low; i <= high; ++i)
{
res = runalg(i);
if (res > highestres)
{
highestres = res;
}
}
produce the error;
3np1.c:15: error: 'for' loop initial declaration used outside C99 mode
for which the answer is
for(int i = low...
should be
int i;
for (i=low...
This dplyr
method works nicely when piping.
For selected columns:
library(dplyr)
iris %>%
select(Sepal.Width, Species) %>%
t %>% c %>% unique
[1] "3.5" "setosa" "3.0" "3.2" "3.1"
[6] "3.6" "3.9" "3.4" "2.9" "3.7"
[11] "4.0" "4.4" "3.8" "3.3" "4.1"
[16] "4.2" "2.3" "versicolor" "2.8" "2.4"
[21] "2.7" "2.0" "2.2" "2.5" "2.6"
[26] "virginica"
Or for the whole dataframe:
iris %>% t %>% c %>% unique
[1] "5.1" "3.5" "1.4" "0.2" "setosa" "4.9"
[7] "3.0" "4.7" "3.2" "1.3" "4.6" "3.1"
[13] "1.5" "5.0" "3.6" "5.4" "3.9" "1.7"
[19] "0.4" "3.4" "0.3" "4.4" "2.9" "0.1"
[25] "3.7" "4.8" "1.6" "4.3" "1.1" "5.8"
[31] "4.0" "1.2" "5.7" "3.8" "1.0" "3.3"
[37] "0.5" "1.9" "5.2" "4.1" "5.5" "4.2"
[43] "4.5" "2.3" "0.6" "5.3" "7.0" "versicolor"
[49] "6.4" "6.9" "6.5" "2.8" "6.3" "2.4"
[55] "6.6" "2.7" "2.0" "5.9" "6.0" "2.2"
[61] "6.1" "5.6" "6.7" "6.2" "2.5" "1.8"
[67] "6.8" "2.6" "virginica" "7.1" "2.1" "7.6"
[73] "7.3" "7.2" "7.7" "7.4" "7.9"
Followed by @Andy's answer, you can do following to solve your second question:
In [56]: df.groupby(['col5','col2']).size().reset_index().groupby('col2')[[0]].max()
Out[56]:
0
col2
A 3
B 2
C 1
D 3
endstring = ''
for s in list:
endstring += s
Ran into the same problem on Laravel 4 trying to send e-mail using SSL encryption.
Having WAMPServer 2.2 on Windows 7 64bit I only enabled php_openssl in the php.ini, restarted WAMPServer and worked flawlessly.
Did following:
If you want to create a "desired" Guid you can do
var tempGuid = Guid.Parse("<guidValue>");
where <guidValue>
would be something like 1A3B944E-3632-467B-A53A-206305310BAE
.
For doing FORM posts, the best way is to use WebClient.UploadValues() with a POST method.
We had the same problem. In our case, the browser was blocked by a login popup (Windows authentication), so not returning after 60 seconds. Adding correct access rights to the Windows account Chrome was running under solved the problem.
EDIT: The fetch request will still be running in the background and will most likely log an error in your console.
Indeed the Promise.race
approach is better.
See this link for reference Promise.race()
Race means that all Promises will run at the same time, and the race will stop as soon as one of the promises returns a value. Therefore, only one value will be returned. You could also pass a function to call if the fetch times out.
fetchWithTimeout(url, {
method: 'POST',
body: formData,
credentials: 'include',
}, 5000, () => { /* do stuff here */ });
If this piques your interest, a possible implementation would be :
function fetchWithTimeout(url, options, delay, onTimeout) {
const timer = new Promise((resolve) => {
setTimeout(resolve, delay, {
timeout: true,
});
});
return Promise.race([
fetch(url, options),
timer
]).then(response => {
if (response.timeout) {
onTimeout();
}
return response;
});
}
Extension methods are not just static method and not just convenience syntax sugar, in fact they are quite powerful tool. The main thing there is ability to override different methods based on different generic’s parameters instantiation. This is similar to Haskell’s type classes, and in fact, it looks like they are in C# to support C#’s Monads (i.e. LINQ). Even dropping LINQ syntax, I still don’t know any way to implement similar interfaces in Java.
And I don’t think it is possible to implement them in Java, because of Java’s type erasure semantics of generics parameters.
List<string> nameslist = new List<string> {"one", "two", "three"} ?
I found the same issue with Tomcat version 6.026.
I used the Mysql JDBC.jar in WebAPP Library as well as in TOMCAT Lib.
To fix the above by removing the Jar from the TOMCAT lib folder.
So what I understand is that TOMCAT is handling the JDBC memory leak properly. But if the MYSQL Jdbc jar is duplicated in WebApp and Tomcat Lib, Tomcat will only be able to handle the jar present in the Tomcat Lib folder.
You have multiple options:
background-size: 100% 100%;
- image gets stretched (aspect ratio may be preserved, depending on browser)background-size: contain;
- image is stretched without cutting it while preserving aspect ratiobackground-size: cover;
- image is completely covering the element while preserving aspect ratio (image can be cut off)/edit: And now, there is even more: https://alligator.io/css/cropping-images-object-fit
Here are screenshots for some browsers to show their differences.
background-size: 100% 100%;
produces the least predictable result.Set<String> mySet = Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>());
Just created local project (with vagrant) and it was working perfectly when accessed over ip address. Then I added some_name.test to hosts file and tried accessing it that way, but I was getting "bad request - 400" all the time. Wasted hours until I figured out that just changing domain name to some-name.test solves the problem. So at least locally on Mac OS it's not working.
create table demotable(group_id number, name varchar2(100));
insert into demotable values(1,'David');
insert into demotable values(1,'John');
insert into demotable values(1,'Alan');
insert into demotable values(1,'David');
insert into demotable values(2,'Julie');
insert into demotable values(2,'Charles');
commit;
select group_id,
(select listagg(column_value, ',') within group (order by column_value) from table(coll_names)) as names
from (
select group_id, collect(distinct name) as coll_names
from demotable
group by group_id
)
GROUP_ID NAMES
1 Alan,David,John
2 Charles,Julie
You can also use psql console to execute \copy without need to send file to Postgresql server machine. The command is the same:
\copy mytable [ ( column_list ) ] FROM '/path/to/csv/file' WITH CSV HEADER
In Swift 4.2: You can use
myArray.append("Tim") //To add "Tim" into array
or
myArray.insert("Tim", at: 0) //Change 0 with specific location
Make sure the scp command is available on both sides - both on the client and on the server.
If this is Fedora or Red Hat Enterprise Linux and clones (CentOS), make sure this package is installed:
yum -y install openssh-clients
If you work with Debian or Ubuntu and clones, install this package:
apt-get install openssh-client
Again, you need to do this both on the server and the client, otherwise you can encounter "weird" error messages on your client: scp: command not found
or similar although you have it locally. This already confused thousands of people, I guess :)
To me its all about knowing your data. If I am continuing to expand my code on the basis of efficiency, I would have to choose the List option as a way of deciphering of my data w/o the unnecessary step of always wondering about types, especially 'Custom Types'. If the machine understands the difference and can determine on it's on what type of data I'm actually dealing with then why should I get in the way and waste time going thru the gyrations of 'IF THEN ELSE' determinations? My philosophy is to let the machine work for me instead of me working on the machine? Knowing the unique differences of different object code commands goes a long way in making your code as efficient.
Tom Johnson (One Entry ... One Exit)
There is a more efficient way of doing this in Windows 7. SETX is installed by default and supports connecting to other systems.
To modify a remote system's global environment variables, you would use
setx /m /s HOSTNAME-GOES-HERE VariableNameGoesHere VariableValueGoesHere
This does not require restarting Windows Explorer.
I want to add a point that you can also (and should if what you are writing is complex) add a test variable to rollback if you are in test mode. Then you can execute the whole thing at once. Often I also add code to see the before and after results of various operations especially if it is a complex script.
Example below:
USE AdventureWorks;
GO
DECLARE @TEST INT = 1--1 is test mode, use zero when you are ready to execute
BEGIN TRANSACTION;
BEGIN TRY
IF @TEST= 1
BEGIN
SELECT *FROM Production.Product
WHERE ProductID = 980;
END
-- Generate a constraint violation error.
DELETE FROM Production.Product
WHERE ProductID = 980;
IF @TEST= 1
BEGIN
SELECT *FROM Production.Product
WHERE ProductID = 980;
IF @@TRANCOUNT > 0
ROLLBACK TRANSACTION;
END
END TRY
BEGIN CATCH
SELECT
ERROR_NUMBER() AS ErrorNumber
,ERROR_SEVERITY() AS ErrorSeverity
,ERROR_STATE() AS ErrorState
,ERROR_PROCEDURE() AS ErrorProcedure
,ERROR_LINE() AS ErrorLine
,ERROR_MESSAGE() AS ErrorMessage;
IF @@TRANCOUNT > 0
ROLLBACK TRANSACTION;
END CATCH;
IF @@TRANCOUNT > 0 AND @TEST = 0
COMMIT TRANSACTION;
GO
There is also this approach seen on SuperUser which uses the sc
command line instead of modifying the registry:
sc config <service name> binPath= <binary path>
Note: the space after binPath=
is important. You can also query the current configuration using:
sc qc <service name>
This displays output similar to:
[SC] QueryServiceConfig SUCCESS
SERVICE_NAME: ServiceName
TYPE : 10 WIN32_OWN_PROCESS START_TYPE : 2 AUTO_START ERROR_CONTROL : 1 NORMAL BINARY_PATH_NAME : C:\Services\ServiceName LOAD_ORDER_GROUP : TAG : 0 DISPLAY_NAME : <Display name> DEPENDENCIES : SERVICE_START_NAME : user-name@domain-name
As far as security, they are inherently the same. While it is true that POST doesn't expose information via the URL, it exposes just as much information as a GET in the actual network communication between the client and server. If you need to pass information that is sensitive, your first line of defense would be to pass it using Secure HTTP.
GET or query string posts are really good for information required for either bookmarking a particular item, or for assisting in search engine optimization and indexing items.
POST is good for standard forms used to submit one time data. I wouldn't use GET for posting actual forms, unless maybe in a search form where you want to allow the user to save the query in a bookmark, or something along those lines.
You need to do some more checking. Right now, you are only checking if the number is divisible by 2. Do the same for 2, 3, 4, 5, 6, ... up to number
. Hint: use a loop.
After you resolve this, try looking for optimizations. Hint: You only have to check all numbers up to the square root of the number
EF 4.7 actually gives a hint when you run Enable-migrations at multiple context.
More than one context type was found in the assembly 'Service.Domain'.
To enable migrations for 'Service.Domain.DatabaseContext.Context1',
use Enable-Migrations -ContextTypeName Service.Domain.DatabaseContext.Context1.
To enable migrations for 'Service.Domain.DatabaseContext.Context2',
use Enable-Migrations -ContextTypeName Service.Domain.DatabaseContext.Context2.
String ordinal(int num)
{
String[] suffix = {"th", "st", "nd", "rd", "th", "th", "th", "th", "th", "th"};
int m = num % 100;
return String.valueOf(num) + suffix[(m > 3 && m < 21) ? 0 : (m % 10)];
}
Here is my adaptation of Michael Soriano's tutorial. See below or in JSBin.
$(function() {_x000D_
var theImage = $('ul#ss li img');_x000D_
var theWidth = theImage.width();_x000D_
//wrap into mother div_x000D_
$('ul#ss').wrap('<div id="mother" />');_x000D_
//assign height width and overflow hidden to mother_x000D_
$('#mother').css({_x000D_
width: function() {_x000D_
return theWidth;_x000D_
},_x000D_
height: function() {_x000D_
return theImage.height();_x000D_
},_x000D_
position: 'relative',_x000D_
overflow: 'hidden'_x000D_
});_x000D_
//get total of image sizes and set as width for ul _x000D_
var totalWidth = theImage.length * theWidth;_x000D_
$('ul').css({_x000D_
width: function() {_x000D_
return totalWidth;_x000D_
}_x000D_
});_x000D_
_x000D_
var ss_timer = setInterval(function() {_x000D_
ss_next();_x000D_
}, 3000);_x000D_
_x000D_
function ss_next() {_x000D_
var a = $(".active");_x000D_
a.removeClass('active');_x000D_
_x000D_
if (a.hasClass('last')) {_x000D_
//last element -- loop_x000D_
a.parent('ul').animate({_x000D_
"margin-left": (0)_x000D_
}, 1000);_x000D_
a.siblings(":first").addClass('active');_x000D_
} else {_x000D_
a.parent('ul').animate({_x000D_
"margin-left": (-(a.index() + 1) * theWidth)_x000D_
}, 1000);_x000D_
a.next().addClass('active');_x000D_
}_x000D_
}_x000D_
_x000D_
// Cancel slideshow and move next manually on click_x000D_
$('ul#ss li img').on('click', function() {_x000D_
clearInterval(ss_timer);_x000D_
ss_next();_x000D_
});_x000D_
_x000D_
});
_x000D_
* {_x000D_
margin: 0;_x000D_
padding: 0;_x000D_
}_x000D_
#ss {_x000D_
list-style: none;_x000D_
}_x000D_
#ss li {_x000D_
float: left;_x000D_
}_x000D_
#ss img {_x000D_
width: 200px;_x000D_
height: 100px;_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>_x000D_
<ul id="ss">_x000D_
<li class="active">_x000D_
<img src="http://leemark.github.io/better-simple-slideshow/demo/img/colorado-colors.jpg">_x000D_
</li>_x000D_
<li>_x000D_
<img src="http://leemark.github.io/better-simple-slideshow/demo/img/monte-vista.jpg">_x000D_
</li>_x000D_
<li class="last">_x000D_
<img src="http://leemark.github.io/better-simple-slideshow/demo/img/colorado.jpg">_x000D_
</li>_x000D_
</ul>
_x000D_
The example provided by @tster shows how to create a list of list. I will provide an example for iterating over such a list.
Iterator<List<String>> iter = listOlist.iterator();
while(iter.hasNext()){
Iterator<String> siter = iter.next().iterator();
while(siter.hasNext()){
String s = siter.next();
System.out.println(s);
}
}
For Hadoop 3.x, if you try to create a file on HDFS when unauthenticated (e.g. user=dr.who
) you will get this error.
It is not recommended for systems that need to be secure, however if you'd like to disable file permissions entirely in Hadoop 3 the hdfs-site.xml
setting has changed to:
<property>
<name>dfs.permissions.enabled</name>
<value>false</value>
</property>
https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml
it appears that if you locate your jquery.js files under the same folder or in some subfolders where your html file is, the Firebug problem is solved. eg if your html is under C:/folder1/, then your js files should be somewhere under C:/folder1/ (or C:/folder1/folder2 etc) as well and addressed accordingly in the html doc. hope this helps.
You can use nonHistorySelectors option from jquery mobile where you do not want to track history. You can find the detailed documentation here http://jquerymobile.com/demos/1.0a4.1/#docs/api/globalconfig.html
I found my git.exe
here
C:\Program Files\Git\bin\git.exe
while installing git
, it asks for the location. copy it and use it.
When you have some binary data that you want to ship across a network, you generally don't do it by just streaming the bits and bytes over the wire in a raw format. Why? because some media are made for streaming text. You never know -- some protocols may interpret your binary data as control characters (like a modem), or your binary data could be screwed up because the underlying protocol might think that you've entered a special character combination (like how FTP translates line endings).
So to get around this, people encode the binary data into characters. Base64 is one of these types of encodings.
Why 64?
Because you can generally rely on the same 64 characters being present in many character sets, and you can be reasonably confident that your data's going to end up on the other side of the wire uncorrupted.
koding.com has a free VM running Ubuntu. The specs are pretty good, 1 gig memory for example. They have a terminal online you can access through their website, or use SSH. The VM will go to sleep approximately 20 minutes after you log out. The reason is to discourage users from running live production code on the VM. The VM resides behind a proxy. Running web servers that only speak HTTP (port 80) should work just fine, but I think you'll get into a lot of trouble whenever you want to work directly with other ports. Many mind-like alternatives offer similar setups. Good luck!
I had the same idea as you but given all restrictions everybody keep imposing everywhere I feel that I must go out and pay for a VPS.
I have just discovered a way to append text and its working fine at least.
var text = 'Put any text here';
$('#text').append(text);
You can change text according to your need.
Hope this helps.
[...] How should Java Comparator class be declared to sort the arrays by their first elements in decreasing order [...]
Here's a complete example using Java 8:
import java.util.*;
public class Test {
public static void main(String args[]) {
int[][] twoDim = { {1, 2}, {3, 7}, {8, 9}, {4, 2}, {5, 3} };
Arrays.sort(twoDim, Comparator.comparingInt(a -> a[0])
.reversed());
System.out.println(Arrays.deepToString(twoDim));
}
}
Output:
[[8, 9], [5, 3], [4, 2], [3, 7], [1, 2]]
For Java 7 you can do:
Arrays.sort(twoDim, new Comparator<int[]>() {
@Override
public int compare(int[] o1, int[] o2) {
return Integer.compare(o2[0], o1[0]);
}
});
If you unfortunate enough to work on Java 6 or older, you'd do:
Arrays.sort(twoDim, new Comparator<int[]>() {
@Override
public int compare(int[] o1, int[] o2) {
return ((Integer) o2[0]).compareTo(o1[0]);
}
});
The method has been renamed to findById(…)
returning an Optional
so that you have to handle absence yourself:
Optional<Foo> result = repository.findById(…);
result.ifPresent(it -> …); // do something with the value if present
result.map(it -> …); // map the value if present
Foo foo = result.orElse(null); // if you want to continue just like before
Just put the below simple code :
notification.sound = Uri.parse("android.resource://"
+ context.getPackageName() + "/" + R.raw.sound_file);
For Default Sound:
notification.defaults |= Notification.DEFAULT_SOUND;
thisReader.GetString(int columnIndex)
A LINQ one-liner for good measure (assuming a private static Random Random
)...
public static string RandomString(int length)
{
return new string(Enumerable.Range(0, length).Select(_ => (char)Random.Next('a', 'z')).ToArray());
}
I had a similar problem that I solved with the following technique:
The exception was thrown at the following line of code (see the text decorated with ** below):
static void Main(string[] args)
{
double number = 0;
string numberStr = string.Format("{0:C2}", 100);
**number = Double.Parse(numberStr);**
Console.WriteLine("The number is {0}", number);
}
After a bit of investigating, I realized that the problem was that the formatted string included a dollar sign ($) that the Parse/TryParse methods cannot resolve (i.e. - strip off). So using the Remove(...) method of the string object I changed the line to:
number = Double.Parse(numberStr.Remove(0, 1)); // Remove the "$" from the number
At that point the Parse(...) method worked as expected.
A static method means that you don't need to invoke the method on an instance. A non-static (instance) method requires that you invoke it on an instance. So think about it: if I have a method changeThisItemToTheColorBlue()
and I try to run it from the main method, what instance would it change? It doesn't know. You can run an instance method on an instance, like someItem.changeThisItemToTheColorBlue()
.
More information at http://en.wikipedia.org/wiki/Method_(computer_programming)#Static_methods.
I believe the syntax you were looking for is as follows:
import csv
with open('coors.csv', mode='r') as infile:
reader = csv.reader(infile)
with open('coors_new.csv', mode='w') as outfile:
writer = csv.writer(outfile)
mydict = {rows[0]:rows[1] for rows in reader}
Alternately, for python <= 2.7.1, you want:
mydict = dict((rows[0],rows[1]) for rows in reader)
I have used Solr, in my project and it is the best so far.
public class Match {
void comp(String s1, String s2) {
char[] charArray1 = s1.toCharArray();
char[] charArray2 = s2.toCharArray();
int length1 = charArray1.length;
int length2 = charArray2.length;
int flag = 0;
if (length1 == length2) {
for (int i = 0; i <= length1 - 1; i++) {
if (charArray1[i] == charArray2[i]) {
System.out.println("index are matched:" + " " + charArray1[i] + " " + "in index-" + i);
} else {
flag = 1;
System.out.println("index are not matched:" + " " + charArray1[i] + " " + "in index-" + i);
System.out.println("index are not matched:" + " " + charArray2[i] + " " + "in index-" + i);
}
}
} else {
System.out.println("Your string are not matched by length");
}
if (flag == 0) {
System.out.println("Your string matched with other String");
} else {
System.out.println("Your string are not matched");
}
}
public static void main(String[] args) {
java.util.Scanner sc = new java.util.Scanner(System.in);
System.out.println("Enter the 1st String:");
String s1 = sc.nextLine();
System.out.println("Enter the 2nd string");
String s2 = sc.nextLine();
Match m = new Match();
m.comp(s1, s2);
}
}
Suppose an aircraft has only two parts: an engine and wings.
Then there are two ways to design an aircraft class.
Class Aircraft extends Engine{
var wings;
}
Now your aircraft can start with having fixed wings
and change them to rotary wings on the fly. It's essentially
an engine with wings. But what if I wanted to change
the engine on the fly as well?
Either the base class Engine
exposes a mutator to change its
properties, or I redesign Aircraft
as:
Class Aircraft {
var wings;
var engine;
}
Now, I can replace my engine on the fly as well.
The oddly named "blame" command does this. If you use Tortoise, it gives you a "from revision" dialog, then a file listing with a line by line indicator of Revision number and author next to it.
If you right click on the revision info, you can bring up a "Show log" dialog that gives full checkin information, along with other files that were part of the checkin.
Using the Google Maps API V3, create a Circle object, then use bindTo() to tie it to the position of your Marker (since they are both google.maps.MVCObject instances).
// Create marker
var marker = new google.maps.Marker({
map: map,
position: new google.maps.LatLng(53, -2.5),
title: 'Some location'
});
// Add circle overlay and bind to marker
var circle = new google.maps.Circle({
map: map,
radius: 16093, // 10 miles in metres
fillColor: '#AA0000'
});
circle.bindTo('center', marker, 'position');
You can make it look just like the Google Latitude circle by changing the fillColor, strokeColor, strokeWeight etc (full API).
See more source code and example screenshots.
Simplistically malloc
and free
work like this:
malloc
provides access to a process's heap. The heap is a construct in the C core library (commonly libc) that allows objects to obtain exclusive access to some space on the process's heap.
Each allocation on the heap is called a heap cell. This typically consists of a header that hold information on the size of the cell as well as a pointer to the next heap cell. This makes a heap effectively a linked list.
When one starts a process, the heap contains a single cell that contains all the heap space assigned on startup. This cell exists on the heap's free list.
When one calls malloc
, memory is taken from the large heap cell, which is returned by malloc
. The rest is formed into a new heap cell that consists of all the rest of the memory.
When one frees memory, the heap cell is added to the end of the heap's free list. Subsequent malloc
's walk the free list looking for a cell of suitable size.
As can be expected the heap can get fragmented and the heap manager may from time to time, try to merge adjacent heap cells.
When there is no memory left on the free list for a desired allocation, malloc
calls brk
or sbrk
which are the system calls requesting more memory pages from the operating system.
Now there are a few modification to optimize heap operations.
Insert single quotes.
Example
$department = mysql_real_escape_string($_POST['department']);
$name = mysql_real_escape_string($_POST['name']);
$email = mysql_real_escape_string($_POST['email']);
$message = mysql_real_escape_string($_POST['message']);
Take a look in the code below.
First, we create custom layouts. In this case, four types.
even.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:background="#ff500000"
android:layout_height="match_parent">
<TextView
android:id="@+id/text"
android:textColor="@android:color/white"
android:layout_width="match_parent"
android:layout_gravity="center"
android:textSize="24sp"
android:layout_height="wrap_content" />
</LinearLayout>
odd.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:background="#ff001f50"
android:gravity="right"
android:layout_height="match_parent">
<TextView
android:id="@+id/text"
android:textColor="@android:color/white"
android:layout_width="wrap_content"
android:layout_gravity="center"
android:textSize="28sp"
android:layout_height="wrap_content" />
</LinearLayout>
white.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:background="#ffffffff"
android:gravity="right"
android:layout_height="match_parent">
<TextView
android:id="@+id/text"
android:textColor="@android:color/black"
android:layout_width="wrap_content"
android:layout_gravity="center"
android:textSize="28sp"
android:layout_height="wrap_content" />
</LinearLayout>
black.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:background="#ff000000"
android:layout_height="match_parent">
<TextView
android:id="@+id/text"
android:textColor="@android:color/white"
android:layout_width="wrap_content"
android:layout_gravity="center"
android:textSize="33sp"
android:layout_height="wrap_content" />
</LinearLayout>
Then, we create the listview item. In our case, with a string and a type.
public class ListViewItem {
private String text;
private int type;
public ListViewItem(String text, int type) {
this.text = text;
this.type = type;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
}
After that, we create a view holder. It's strongly recommended because Android OS keeps the layout reference to reuse your item when it disappears and appears back on the screen. If you don't use this approach, every single time that your item appears on the screen Android OS will create a new one and causing your app to leak memory.
public class ViewHolder {
TextView text;
public ViewHolder(TextView text) {
this.text = text;
}
public TextView getText() {
return text;
}
public void setText(TextView text) {
this.text = text;
}
}
Finally, we create our custom adapter overriding getViewTypeCount() and getItemViewType(int position).
public class CustomAdapter extends ArrayAdapter {
public static final int TYPE_ODD = 0;
public static final int TYPE_EVEN = 1;
public static final int TYPE_WHITE = 2;
public static final int TYPE_BLACK = 3;
private ListViewItem[] objects;
@Override
public int getViewTypeCount() {
return 4;
}
@Override
public int getItemViewType(int position) {
return objects[position].getType();
}
public CustomAdapter(Context context, int resource, ListViewItem[] objects) {
super(context, resource, objects);
this.objects = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
ListViewItem listViewItem = objects[position];
int listViewItemType = getItemViewType(position);
if (convertView == null) {
if (listViewItemType == TYPE_EVEN) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_even, null);
} else if (listViewItemType == TYPE_ODD) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_odd, null);
} else if (listViewItemType == TYPE_WHITE) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_white, null);
} else {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.type_black, null);
}
TextView textView = (TextView) convertView.findViewById(R.id.text);
viewHolder = new ViewHolder(textView);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.getText().setText(listViewItem.getText());
return convertView;
}
}
And our activity is something like this:
private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); // here, you can create a single layout with a listview
listView = (ListView) findViewById(R.id.listview);
final ListViewItem[] items = new ListViewItem[40];
for (int i = 0; i < items.length; i++) {
if (i == 4) {
items[i] = new ListViewItem("White " + i, CustomAdapter.TYPE_WHITE);
} else if (i == 9) {
items[i] = new ListViewItem("Black " + i, CustomAdapter.TYPE_BLACK);
} else if (i % 2 == 0) {
items[i] = new ListViewItem("EVEN " + i, CustomAdapter.TYPE_EVEN);
} else {
items[i] = new ListViewItem("ODD " + i, CustomAdapter.TYPE_ODD);
}
}
CustomAdapter customAdapter = new CustomAdapter(this, R.id.text, items);
listView.setAdapter(customAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView adapterView, View view, int i, long l) {
Toast.makeText(getBaseContext(), items[i].getText(), Toast.LENGTH_SHORT).show();
}
});
}
}
now create a listview inside mainactivity.xml like this
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.shivnandan.gygy.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/listView"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="100dp" />
</android.support.design.widget.CoordinatorLayout>
The following answer is a small improvement based upon qwertzguy's answer.
double density = getResources().getDisplayMetrics().density;
if (density >= 4.0) {
//"xxxhdpi";
}
else if (density >= 3.0 && density < 4.0) {
//xxhdpi
}
else if (density >= 2.0) {
//xhdpi
}
else if (density >= 1.5 && density < 2.0) {
//hdpi
}
else if (density >= 1.0 && density < 1.5) {
//mdpi
}
var GDNUtils = {};
GDNUtils.loadJquery = function () {
var checkjquery = window.jQuery && jQuery.fn && /^1\.[3-9]/.test(jQuery.fn.jquery);
if (!checkjquery) {
var theNewScript = document.createElement("script");
theNewScript.type = "text/javascript";
theNewScript.src = "http://code.jquery.com/jquery.min.js";
document.getElementsByTagName("head")[0].appendChild(theNewScript);
// jQuery MAY OR MAY NOT be loaded at this stage
}
};
GDNUtils.searchJsonValue = function (jsonData, keytoSearch, valuetoSearch, keytoGet) {
GDNUtils.loadJquery();
alert('here' + jsonData.length.toString());
GDNUtils.loadJquery();
$.each(jsonData, function (i, v) {
if (v[keytoSearch] == valuetoSearch) {
alert(v[keytoGet].toString());
return;
}
});
};
GDNUtils.searchJson = function (jsonData, keytoSearch, valuetoSearch) {
GDNUtils.loadJquery();
alert('here' + jsonData.length.toString());
GDNUtils.loadJquery();
var row;
$.each(jsonData, function (i, v) {
if (v[keytoSearch] == valuetoSearch) {
row = v;
}
});
return row;
}
The @RequestBody
javadoc states
Annotation indicating a method parameter should be bound to the body of the web request.
It uses registered instances of HttpMessageConverter
to deserialize the request body into an object of the annotated parameter type.
And the @RequestParam
javadoc states
Annotation which indicates that a method parameter should be bound to a web request parameter.
Spring binds the body of the request to the parameter annotated with @RequestBody
.
Spring binds request parameters from the request body (url-encoded parameters) to your method parameter. Spring will use the name of the parameter, ie. name
, to map the parameter.
Parameters are resolved in order. The @RequestBody
is processed first. Spring will consume all the HttpServletRequest
InputStream
. When it then tries to resolve the @RequestParam
, which is by default required
, there is no request parameter in the query string or what remains of the request body, ie. nothing. So it fails with 400 because the request can't be correctly handled by the handler method.
The handler for @RequestParam
acts first, reading what it can of the HttpServletRequest
InputStream
to map the request parameter, ie. the whole query string/url-encoded parameters. It does so and gets the value abc
mapped to the parameter name
. When the handler for @RequestBody
runs, there's nothing left in the request body, so the argument used is the empty string.
The handler for @RequestBody
reads the body and binds it to the parameter. The handler for @RequestParam
can then get the request parameter from the URL query string.
The handler for @RequestParam
reads from both the body and the URL query String. It would usually put them in a Map
, but since the parameter is of type String
, Spring will serialize the Map
as comma separated values. The handler for @RequestBody
then, again, has nothing left to read from the body.
Its very simple
new AlertDialog.Builder(this).setView(input).setPositiveButton("ENTER",
new DialogInterface.OnClickListener()
{ public void onClick(DialogInterface di,int id)
{
output.setText(input.getText().toString());
}
}
)
.create().show();
In case you wish to read the full program see here: Program to take input from user using dialog and output to screen
Download the file from http://www.java2s.com/Code/Jar/STUVWXYZ/Downloadjavaxservletjar.htm
Make a folder ("lib") inside the project folder and move that jar file to there.
In Eclipse, right click on project > BuildPath > Configure BuildPath > Libraries > Add External Jar
Thats all
Use simple CSS3 (not supported in IE<9)
img
{
box-shadow: 0px 0px 5px #fff;
}
This will put a white glow around every image in your document, use more specific selectors to choose which images you'd like the glow around. You can change the color of course :)
If you're worried about the users that don't have the latest versions of their browsers, use this:
img
{
-moz-box-shadow: 0 0 5px #fff;
-webkit-box-shadow: 0 0 5px #fff;
box-shadow: 0px 0px 5px #fff;
}
For IE you can use a glow filter (not sure which browsers support it)
img
{
filter:progid:DXImageTransform.Microsoft.Glow(Color=white,Strength=5);
}
Play with the settings to see what suits you :)
1. Installing OpenCV 2.4.3
First, get OpenCV 2.4.3 from sourceforge.net. Its a self-extracting so just double click to start the installation. Install it in a directory, say C:\
.
Wait until all files get extracted. It will create a new directory C:\opencv
which
contains OpenCV header files, libraries, code samples, etc.
Now you need to add the directory C:\opencv\build\x86\vc10\bin
to your system PATH. This directory contains OpenCV DLLs required for running your code.
Open Control Panel → System → Advanced system settings → Advanced Tab → Environment variables...
On the System Variables section, select Path (1), Edit (2), and type C:\opencv\build\x86\vc10\bin;
(3), then click Ok.
On some computers, you may need to restart your computer for the system to recognize the environment path variables.
This will completes the OpenCV 2.4.3 installation on your computer.
2. Create a new project and set up Visual C++
Open Visual C++ and select File → New → Project... → Visual C++ → Empty Project. Give a name for your project (e.g: cvtest
) and set the project location (e.g: c:\projects
).
Click Ok. Visual C++ will create an empty project.
Make sure that "Debug" is selected in the solution configuration combobox. Right-click cvtest
and select Properties → VC++ Directories.
Select Include Directories to add a new entry and type C:\opencv\build\include
.
Click Ok to close the dialog.
Back to the Property dialog, select Library Directories to add a new entry and type C:\opencv\build\x86\vc10\lib
.
Click Ok to close the dialog.
Back to the property dialog, select Linker → Input → Additional Dependencies to add new entries. On the popup dialog, type the files below:
opencv_calib3d243d.lib
opencv_contrib243d.lib
opencv_core243d.lib
opencv_features2d243d.lib
opencv_flann243d.lib
opencv_gpu243d.lib
opencv_haartraining_engined.lib
opencv_highgui243d.lib
opencv_imgproc243d.lib
opencv_legacy243d.lib
opencv_ml243d.lib
opencv_nonfree243d.lib
opencv_objdetect243d.lib
opencv_photo243d.lib
opencv_stitching243d.lib
opencv_ts243d.lib
opencv_video243d.lib
opencv_videostab243d.lib
Note that the filenames end with "d" (for "debug"). Also note that if you have installed another version of OpenCV (say 2.4.9) these filenames will end with 249d instead of 243d (opencv_core249d.lib..etc).
Click Ok to close the dialog. Click Ok on the project properties dialog to save all settings.
NOTE:
These steps will configure Visual C++ for the "Debug" solution. For "Release" solution (optional), you need to repeat adding the OpenCV directories and in Additional Dependencies section, use:
opencv_core243.lib
opencv_imgproc243.lib
...
instead of:
opencv_core243d.lib
opencv_imgproc243d.lib
...
You've done setting up Visual C++, now is the time to write the real code. Right click your project and select Add → New Item... → Visual C++ → C++ File.
Name your file (e.g: loadimg.cpp
) and click Ok. Type the code below in the editor:
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main()
{
Mat im = imread("c:/full/path/to/lena.jpg");
if (im.empty())
{
cout << "Cannot load image!" << endl;
return -1;
}
imshow("Image", im);
waitKey(0);
}
The code above will load c:\full\path\to\lena.jpg
and display the image. You can
use any image you like, just make sure the path to the image is correct.
Type F5 to compile the code, and it will display the image in a nice window.
And that is your first OpenCV program!
3. Where to go from here?
Now that your OpenCV environment is ready, what's next?
c:\opencv\samples\cpp
.You can use some function to initialize struct as follows,
typedef struct
{
int flag;
} MyStruct;
MyStruct GetMyStruct(int value)
{
MyStruct My = {0};
My.flag = value;
return My;
}
void main (void)
{
MyStruct temp;
temp = GetMyStruct(3);
printf("%d\n", temp.flag);
}
EDIT:
typedef struct
{
int flag;
} MyStruct;
MyStruct MyData[20];
MyStruct GetMyStruct(int value)
{
MyStruct My = {0};
My.flag = value;
return My;
}
void main (void)
{
int i;
for (i = 0; i < 20; i ++)
MyData[i] = GetMyStruct(3);
for (i = 0; i < 20; i ++)
printf("%d\n", MyData[i].flag);
}
We need the primary key of that particular model that you want to update. For example:
private fun update(Name: String?, Brand: String?) {
val deviceEntity = remoteDao?.getRemoteId(Id)
if (deviceEntity == null)
remoteDao?.insertDevice(DeviceEntity(DeviceModel = DeviceName, DeviceBrand = DeviceBrand))
else
DeviceDao?.updateDevice(DeviceEntity(deviceEntity.id,remoteDeviceModel = DeviceName, DeviceBrand = DeviceBrand))
}
In this function, I am checking whether a particular entry exists in the database if exists pull the primary key which is id over here and perform update function.
This is the for fetching and update records:
@Query("SELECT * FROM ${DeviceDatabase.DEVICE_TABLE_NAME} WHERE ${DeviceDatabase.COLUMN_DEVICE_ID} = :DeviceId LIMIT 1")
fun getRemoteDeviceId(DeviceId: String?): DeviceEntity
@Update(onConflict = OnConflictStrategy.REPLACE)
fun updatDevice(item: DeviceEntity): Int
This should do:
$chunk = "abc\tdef\tghi";
Here is a link to an article with more extensive examples.
I will add a StackBlitz example and a comment to the answer from @tahiche.
The return value is a function to remove the event listener after you have added it. It is considered good practice to remove event listeners when you don't need them anymore. So you can store this return value and call it inside your ngOnDestroy
method.
I admit that it might seem confusing at first, but it is actually a very useful feature. How else can you clean up after yourself?
export class MyComponent implements OnInit, OnDestroy {
public removeEventListener: () => void;
constructor(
private renderer: Renderer2,
private elementRef: ElementRef
) {
}
public ngOnInit() {
this.removeEventListener = this.renderer.listen(this.elementRef.nativeElement, 'click', (event) => {
if (event.target instanceof HTMLAnchorElement) {
// Prevent opening anchors the default way
event.preventDefault();
// Your custom anchor click event handler
this.handleAnchorClick(event);
}
});
}
public ngOnDestroy() {
this.removeEventListener();
}
}
You can find a StackBlitz here to show how this could work for catching clicking on anchor elements.
I added a body with an image as follows:
<img src="x" onerror="alert(1)"></div>
to show that the sanitizer is doing its job.
Here in this fiddle you find the same body attached to an innerHTML
without sanitizing it and it will demonstrate the issue.
For Ubuntu instances:
chmod 600 ec2-keypair.pem
ssh -v -i ec2-keypair.pem [email protected]
For other instances, you might have to use ec2-user
instead of ubuntu
.
Most EC2 Linux images I've used only have the root user created by default.
Have a look at werkzeug. Werkzeug started as a simple collection of various utilities for WSGI applications and has become one of the most advanced WSGI utility modules. It includes a powerful debugger, full featured request and response objects, HTTP utilities to handle entity tags, cache control headers, HTTP dates, cookie handling, file uploads, a powerful URL routing system and a bunch of community contributed addon modules.
It includes lots of cool tools to work with http and has the advantage that you can use it with wsgi in different environments (cgi, fcgi, apache/mod_wsgi or with a plain simple python server for debugging).
The std::system_error
example above is slightly incorrect. std::system_category()
will map the error codes from system's native error code facility. For *nix, this is errno
. For Win32, it is GetLastError()
. ie, on Windows, the above example will print
failed to open C:\path\to\forbidden: The data is invalid
because EACCES is 13 which is the Win32 error code ERROR_INVALID_DATA
To fix it, either use the system's native error code facility, eg on Win32
throw new std::system_error(GetLastError(), std::system_category(), "failed to open"+ filename);
Or use errno and std::generic_category()
, eg
throw new std::system_error(errno, std::generic_category(), "failed to open"+ filename);
String dateTime="15-3-2019 09:50 AM" //time should be two digit like 08,09,10
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd-MM-yyyy hh:mm a");
LocalDateTime zdt = LocalDateTime.parse(dateTime,dtf);
LocalDateTime now = LocalDateTime.now();
ZoneId zone = ZoneId.of("Asia/Kolkata");
ZoneOffset zoneOffSet = zone.getRules().getOffset(now);
long a= zdt.toInstant(zoneOffSet).toEpochMilli();
Log.d("time","---"+a);
you can get zone id form this a link!
Are you looking for actual infinity or the minimal finite value? If the former, use
-numeric_limits<double>::infinity()
which only works if
numeric_limits<double>::has_infinity
Otherwise, you should use
numeric_limits<double>::lowest()
which was introduces in C++11.
If lowest()
is not available, you can fall back to
-numeric_limits<double>::max()
which may differ from lowest()
in principle, but normally doesn't in practice.
<%= Html.TextBoxFor(m => Model.Events.Subscribed[i].Action, new {readonly=true})%>
Much of the time when you ask for a dynamic object, you get an ExpandoObject (not in the question's anonymous-but-statically-typed example above, but you mention JavaScript and my chosen JSON parser JsonFx, for one, generates ExpandoObjects).
If your dynamic is in fact an ExpandoObject, you can avoid reflection by casting it to IDictionary, as described at http://msdn.microsoft.com/en-gb/library/system.dynamic.expandoobject.aspx.
Once you've cast to IDictionary, you have access to useful methods like .Item and .ContainsKey
You can cast an integer to a string in this way
intval::text
and so in your case
SELECT * FROM table WHERE <some integer>::text = 'string of numbers'
You can use this method:
boolean isAlive()
It returns true if the thread is still alive and false if the Thread is dead. This is not static. You need a reference to the object of the Thread class.
One more tip: If you're checking it's status to make the main thread wait while the new thread is still running, you may use join() method. It is more handy.
Hope this helps.
<?php
function _iscurl() {
return function_exists('curl_version');
}
?>
import org.junit.Assert
import org.junit.Before
import org.junit.BeforeClass
import org.junit.Test
class FeatureTest {
companion object {
private lateinit var heavyFeature: HeavyFeature
@BeforeClass
@JvmStatic
fun beforeHeavy() {
heavyFeature = HeavyFeature()
}
}
private lateinit var feature: Feature
@Before
fun before() {
feature = Feature()
}
@Test
fun testCool() {
Assert.assertTrue(heavyFeature.cool())
Assert.assertTrue(feature.cool())
}
@Test
fun testWow() {
Assert.assertTrue(heavyFeature.wow())
Assert.assertTrue(feature.wow())
}
}
Same as
import org.junit.Assert
import org.junit.Test
class FeatureTest {
companion object {
private val heavyFeature = HeavyFeature()
}
private val feature = Feature()
@Test
fun testCool() {
Assert.assertTrue(heavyFeature.cool())
Assert.assertTrue(feature.cool())
}
@Test
fun testWow() {
Assert.assertTrue(heavyFeature.wow())
Assert.assertTrue(feature.wow())
}
}
Here is another way you can change the selected option of a <select>
element in javascript. You can use
document.getElementById('salesperson').selectedIndex=1;
Setting it to 1 will make the second element of the dropdown selected. The select element index start from 0.
Here is a sample code. Check if you can use this type of approach:
<html>
<head>
<script language="javascript">
function changeSelected() {
document.getElementById('salesperson').selectedIndex=1;
}
</script>
</head>
<body>
<form name="f1">
<select id="salesperson" >
<option value"">james</option>
<option value"">john</option>
</select>
<input type="button" value="Change Selected" onClick="changeSelected();">
</form>
</body>
</html>
Closing conformation alert:
Private Sub cmd_exit_click()
' By clicking on the button the MsgBox will appear
If MsgBox("Are you sure want to exit now?", MsgBoxStyle.YesNo, "closing warning") = MsgBoxResult.Yes Then ' If you select yes in the MsgBox then it will close the window
Me.Close() ' Close the window
Else
' Will not close the application
End If
End Sub
You forgot to add std::
namespace prefix to vector
class name.
You get this error message if a Python file was closed from "the outside", i.e. not from the file object's close()
method:
>>> f = open(".bashrc")
>>> os.close(f.fileno())
>>> del f
close failed in file object destructor:
IOError: [Errno 9] Bad file descriptor
The line del f
deletes the last reference to the file object, causing its destructor file.__del__
to be called. The internal state of the file object indicates the file is still open since f.close()
was never called, so the destructor tries to close the file. The OS subsequently throws an error because of the attempt to close a file that's not open.
Since the implementation of os.system()
does not create any Python file objects, it does not seem likely that the system()
call is the origin of the error. Maybe you could show a bit more code?
In Python using generators for very large directories, including blank extensions, and getting the number of times each extension shows up:
import json
import collections
import itertools
import os
root = '/home/andres'
files = itertools.chain.from_iterable((
files for _,_,files in os.walk(root)
))
counter = collections.Counter(
(os.path.splitext(file_)[1] for file_ in files)
)
print json.dumps(counter, indent=2)
My issue was that end users would start typing in a textbox and receive autocomplete (ACP) suggestions and update the calling control if a suggestion was selected as the ACP is designed by default. However, I also needed to update multiple other controls (textboxes, DropDowns, etc...) with data specific to the end user's selection. I have been trying to figure out an elegant solution to the issue and I feel the one I developed is worth sharing and hopefully will save you at least some time.
WebMethod (SampleWM.aspx):
PURPOSE:
NOTES:
//Call to custom function to return SP results as a DataTable
// DataTable will consist of Field0 - Field5
Dim params As ArrayList = New ArrayList
params.Add("@QueryFilter|" & QueryFilter)
Dim dt As DataTable = Data.GetDataTableFromSP("AutoComplete", params, [ConnStr])
//Create a StringBuilder Obj to hold the JSON
//IE: [{"Field0":"0","Field1":"Test","Field2":"Jason","Field3":"Smith","Field4":"32","Field5":"888-555-1212"},{"Field0":"1","Field1":"Test2","Field2":"Jane","Field3":"Doe","Field4":"25","Field5":"888-555-1414"}]
Dim jStr As StringBuilder = New StringBuilder
//Loop the DataTable and convert row into JSON String
If dt.Rows.Count > 0 Then
jStr.Append("[")
Dim RowCnt As Integer = 1
For Each r As DataRow In dt.Rows
jStr.Append("{")
Dim ColCnt As Integer = 0
For Each c As DataColumn In dt.Columns
If ColCnt = 0 Then
jStr.Append("""" & c.ColumnName & """:""" & r(c.ColumnName) & """")
Else
jStr.Append(",""" & c.ColumnName & """:""" & r(c.ColumnName) & """")
End If
ColCnt += 1
Next
If Not RowCnt = dt.Rows.Count Then
jStr.Append("},")
Else
jStr.Append("}")
End If
RowCnt += 1
Next
jStr.Append("]")
End If
//Return JSON to WebMethod Caller
Return jStr.ToString
AutoComplete jQuery (AutoComplete.aspx):
$(function() {
$("#LookUp").autocomplete({
source: function (request, response) {
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "SampleWM.aspx/GetAutoCompleteData",
dataType: "json",
data:'{QueryFilter: "' + request.term + '"}',
success: function (data) {
response($.map($.parseJSON(data.d), function (item) {
var AC = new Object();
//autocomplete default values REQUIRED
AC.label = item.Field0;
AC.value = item.Field1;
//extend values
AC.FirstName = item.Field2;
AC.LastName = item.Field3;
AC.Age = item.Field4;
AC.Phone = item.Field5;
return AC
}));
}
});
},
minLength: 3,
select: function (event, ui) {
$("#txtFirstName").val(ui.item.FirstName);
$("#txtLastName").val(ui.item.LastName);
$("#ddlAge").val(ui.item.Age);
$("#txtPhone").val(ui.item.Phone);
}
});
});
even though this post is quite old I tried something that worked for my case .
I wanted to create a string variable with the value below:
21541_12_1_13\":null
so my approach was like that:
build the string using verbatim
string substring = @"21541_12_1_13\"":null";
and then remove the unwanted backslashes using Remove function
string newsubstring = substring.Remove(13, 1);
Hope that helps. Cheers
Use get(0)
instead of html()
. In other words, replace
doc.fromHTML($('#htmlTableId').html(), 15, 15, {
'width': 170,'elementHandlers': specialElementHandlers
});
with
doc.fromHTML($('#htmlTableId').get(0), 15, 15, {
'width': 170,'elementHandlers': specialElementHandlers
});
There are several ways to do it:
n = L[0][0]
m = len(A)
found = False
for i in range(m):
if found:
break
for j in range(m):
if L[i][j] != n:
found = True
break
Pros: easy to understand Cons: additional conditional statement for every loop
n = L[0][0]
m = len(A)
try:
for x in range(3):
for z in range(3):
if L[i][j] != n:
raise StopIteration
except StopIteration:
pass
Pros: very straightforward Cons: you use Exception outside of their semantic
def is_different_value(l, elem, size):
for x in range(size):
for z in range(size):
if l[i][j] != elem:
return True
return False
if is_different_value(L, L[0][0], len(A)):
print "Doh"
pros: much cleaner and still efficient cons: yet feels like C
def is_different_value(iterable):
first = iterable[0][0]
for l in iterable:
for elem in l:
if elem != first:
return True
return False
if is_different_value(L):
print "Doh"
pros: still clean and efficient cons: you reinvdent the wheel
any()
:def is_different_value(iterable):
first = iterable[0][0]
return any(any((cell != first for cell in col)) for elem in iterable)):
if is_different_value(L):
print "Doh"
pros: you'll feel empowered with dark powers cons: people that will read you code may start to dislike you
? 1. Can I set state inside a useEffect hook?
In principle, you can set state freely where you need it - including inside useEffect
and even during rendering. Just make sure to avoid infinite loops by settting Hook deps
properly and/or state conditionally.
? 2. Lets say I have some state that is dependent on some other state. Is it appropriate to create a hook that observes A and sets B inside the useEffect hook?
You just described the classic use case for useReducer
:
useReducer
is usually preferable touseState
when you have complex state logic that involves multiple sub-values or when the next state depends on the previous one. (React docs)When setting a state variable depends on the current value of another state variable, you might want to try replacing them both with
useReducer
. [...] When you find yourself writingsetSomething(something => ...)
, it’s a good time to consider using a reducer instead. (Dan Abramov, Overreacted blog)
let MyComponent = () => {_x000D_
let [state, dispatch] = useReducer(reducer, { a: 1, b: 2 });_x000D_
_x000D_
useEffect(() => {_x000D_
console.log("Some effect with B");_x000D_
}, [state.b]);_x000D_
_x000D_
return (_x000D_
<div>_x000D_
<p>A: {state.a}, B: {state.b}</p>_x000D_
<button onClick={() => dispatch({ type: "SET_A", payload: 5 })}>_x000D_
Set A to 5 and Check B_x000D_
</button>_x000D_
<button onClick={() => dispatch({ type: "INCREMENT_B" })}>_x000D_
Increment B_x000D_
</button>_x000D_
</div>_x000D_
);_x000D_
};_x000D_
_x000D_
// B depends on A. If B >= A, then reset B to 1._x000D_
function reducer(state, { type, payload }) {_x000D_
const someCondition = state.b >= state.a;_x000D_
_x000D_
if (type === "SET_A")_x000D_
return someCondition ? { a: payload, b: 1 } : { ...state, a: payload };_x000D_
else if (type === "INCREMENT_B") return { ...state, b: state.b + 1 };_x000D_
return state;_x000D_
}_x000D_
_x000D_
ReactDOM.render(<MyComponent />, document.getElementById("root"));
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.0/umd/react.production.min.js" integrity="sha256-32Gmw5rBDXyMjg/73FgpukoTZdMrxuYW7tj8adbN8z4=" crossorigin="anonymous"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.0/umd/react-dom.production.min.js" integrity="sha256-bjQ42ac3EN0GqK40pC9gGi/YixvKyZ24qMP/9HiGW7w=" crossorigin="anonymous"></script>_x000D_
<div id="root"></div>_x000D_
<script>var { useReducer, useEffect } = React</script>
_x000D_
? 3. Will the effects cascade such that, when I click the button, the first effect will fire, causing b to change, causing the second effect to fire, before the next render?
useEffect
always runs after the render is committed and DOM changes are applied. The first effect fires, changes b
and causes a re-render. After this render has completed, second effect will run due to b
changes.
let MyComponent = props => {_x000D_
console.log("render");_x000D_
let [a, setA] = useState(1);_x000D_
let [b, setB] = useState(2);_x000D_
_x000D_
let isFirstRender = useRef(true);_x000D_
_x000D_
useEffect(() => {_x000D_
console.log("useEffect a, value:", a);_x000D_
if (isFirstRender.current) isFirstRender.current = false;_x000D_
else setB(3);_x000D_
return () => {_x000D_
console.log("unmount useEffect a, value:", a);_x000D_
};_x000D_
}, [a]);_x000D_
useEffect(() => {_x000D_
console.log("useEffect b, value:", b);_x000D_
return () => {_x000D_
console.log("unmount useEffect b, value:", b);_x000D_
};_x000D_
}, [b]);_x000D_
_x000D_
return (_x000D_
<div>_x000D_
<p>a: {a}, b: {b}</p>_x000D_
<button_x000D_
onClick={() => {_x000D_
console.log("Clicked!");_x000D_
setA(5);_x000D_
}}_x000D_
>_x000D_
click me_x000D_
</button>_x000D_
</div>_x000D_
);_x000D_
};_x000D_
_x000D_
ReactDOM.render(<MyComponent />, document.getElementById("root"));
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.0/umd/react.production.min.js" integrity="sha256-32Gmw5rBDXyMjg/73FgpukoTZdMrxuYW7tj8adbN8z4=" crossorigin="anonymous"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.0/umd/react-dom.production.min.js" integrity="sha256-bjQ42ac3EN0GqK40pC9gGi/YixvKyZ24qMP/9HiGW7w=" crossorigin="anonymous"></script>_x000D_
<div id="root"></div>_x000D_
<script>var { useReducer, useEffect, useState, useRef } = React</script>
_x000D_
? 4. Are there any performance downsides to structuring code like this?
Yes. By wrapping the state change of b
in a separate useEffect
for a
, the browser has an additional layout/paint phase - these effects are potentially visible for the user. If there is no way you want give useReducer
a try, you could change b
state together with a
directly:
let MyComponent = () => {_x000D_
console.log("render");_x000D_
let [a, setA] = useState(1);_x000D_
let [b, setB] = useState(2);_x000D_
_x000D_
useEffect(() => {_x000D_
console.log("useEffect b, value:", b);_x000D_
return () => {_x000D_
console.log("unmount useEffect b, value:", b);_x000D_
};_x000D_
}, [b]);_x000D_
_x000D_
const handleClick = () => {_x000D_
console.log("Clicked!");_x000D_
setA(5);_x000D_
b >= 5 ? setB(1) : setB(b + 1);_x000D_
};_x000D_
_x000D_
return (_x000D_
<div>_x000D_
<p>_x000D_
a: {a}, b: {b}_x000D_
</p>_x000D_
<button onClick={handleClick}>click me</button>_x000D_
</div>_x000D_
);_x000D_
};_x000D_
_x000D_
ReactDOM.render(<MyComponent />, document.getElementById("root"));
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.0/umd/react.production.min.js" integrity="sha256-32Gmw5rBDXyMjg/73FgpukoTZdMrxuYW7tj8adbN8z4=" crossorigin="anonymous"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.0/umd/react-dom.production.min.js" integrity="sha256-bjQ42ac3EN0GqK40pC9gGi/YixvKyZ24qMP/9HiGW7w=" crossorigin="anonymous"></script>_x000D_
<div id="root"></div>_x000D_
<script>var { useReducer, useEffect, useState, useRef } = React</script>
_x000D_
First you need to declare your resources in dispatcher-servlet file like this :
<mvc:resources mapping="/resources/**" location="/resources/folder/" />
Any request with url mapping /resources/** will directly look for /resources/folder/.
Now in jsp file you need to include your css file like this :
<link href="<c:url value="/resources/css/main.css" />" rel="stylesheet">
Similarly you can include js files.
Hope this solves your problem.
Alternatively:
if( jQuery('#elem').get(0) ) {}
Note that there is a distinction between traditional "beta testing" which is done by professional QA engineers, and "public beta testing" which is releasing your product to the public before it's ready : )
You can do "beta testing" -- loading to specific iPhones/iPods your testers will be using. You can't do "public beta testing" -- pre-releasing to the public.
Had a similar problem. I updated my Genymotion and my android SDK's/libraries/dependencies and all seemed to work. To update my SDK's I used android sdk manager {ANDROID_SDK_FOLDER}/tools/android sdk
1) Hold Control+ left click on the method you want to see. Then Eclipse will bring you to the Source Not Found page.
4) Navigate to C:\Program Files\Java\jdk-9.0.1\lib\src.zip
Look for this on your Manifest.xml android:icon="@drawable/ic_launcher"
then change the ic_launcher
to the name of your icon which is on your @drawable
folder.
You may use a controller in directive:
angular.module('app', [])
.directive('appClick', function(){
return {
restrict: 'A',
scope: true,
template: '<button ng-click="click()">Click me</button> Clicked {{clicked}} times',
controller: function($scope, $element){
$scope.clicked = 0;
$scope.click = function(){
$scope.clicked++
}
}
}
});
More about directives in Angular guide. And very helpfull for me was videos from official Angular blog post About those directives.