Spring Boot: Cannot access REST Controller on localhost (404)
Same 404 response I got after service executed with the below code
@Controller
@RequestMapping("/duecreate/v1.0")
public class DueCreateController {
}
Response:
{
"timestamp": 1529692263422,
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/duecreate/v1.0/status"
}
after changing it to below code I received proper response
@RestController
@RequestMapping("/duecreate/v1.0")
public class DueCreateController {
}
Response:
{
"batchId": "DUE1529673844630",
"batchType": null,
"executionDate": null,
"status": "OPEN"
}
How to include js and CSS in JSP with spring MVC
If you using java-based annotation you can do this:
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("/static/");
}
Where static folder
src
¦
+---main
+---java
+---resources
+---webapp
+---static
+---css
+---....
Spring Boot application.properties value not populating
follow these steps. 1:- create your configuration class like below you can see
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.beans.factory.annotation.Value;
@Configuration
public class YourConfiguration{
// passing the key which you set in application.properties
@Value("${some.pro}")
private String somePro;
// getting the value from that key which you set in application.properties
@Bean
public String getsomePro() {
return somePro;
}
}
2:- when you have a configuration class then inject in the variable from a configuration where you need.
@Component
public class YourService {
@Autowired
private String getsomePro;
// now you have a value in getsomePro variable automatically.
}
How to access Spring MVC model object in javascript file?
This way works and with this structure you can create your own framework and do it with less boilerplate.
Sorry if some error is present, I'm writing this handly with my cellphone
Maven dependency:
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>1.7.1</version>
</dependency>
Java:
Person.java (Person Object Class)
Class Person {
private String name;
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
}
PersonController.java (Person Controller)
@RestController
public class PersonController implements Controller {
@RequestMapping("/person")
public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
Person person = new Person();
person.setName("Person's name");
Gson gson = new Gson();
ModelAndView modelAndView = new ModelAndView("person");
modelAndView.addObject("person", gson.toJson(person));
return modelAndView;
}
}
View:
person.jsp
<html>
<head>
<title>Person Example</title>
<script src="jquery-1.11.3.min.js"></script>
<script type="text/javascript" src="personScript.js"></script>
</head>
<body>
<h1>Person/h1>
<input type="hidden" id="person" value="${person}">
</body>
</html>
Javascript:
personScript.js
function parseJSON(data) {
return window.JSON && window.JSON.parse ? window.JSON.parse( data ) : (new Function("return " + data))();
}
$(document).ready(function() {
var personJson = $('#person');
person = parseJSON(personJson.val());
alert(person.name);
});
No mapping found for HTTP request with URI.... in DispatcherServlet with name
You could try and add an @Controller annotation on top of your myController Class and
try the following url /<webappname>/my/hello.html.
This is because org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping prepends /my to each RequestMapping in the myController class.
Combine GET and POST request methods in Spring
@RequestMapping(value = "/testonly", method = { RequestMethod.GET, RequestMethod.POST })
public ModelAndView listBooksPOST(@ModelAttribute("booksFilter") BooksFilter filter,
@RequestParam(required = false) String parameter1,
@RequestParam(required = false) String parameter2,
BindingResult result, HttpServletRequest request)
throws ParseException {
LONG CODE and SAME LONG CODE with a minor difference
}
if @RequestParam(required = true) then you must pass parameter1,parameter2
Use BindingResult and request them based on your conditions.
The Other way
@RequestMapping(value = "/books", method = RequestMethod.GET)
public ModelAndView listBooks(@ModelAttribute("booksFilter") BooksFilter filter,
two @RequestParam parameters, HttpServletRequest request) throws ParseException {
myMethod();
}
@RequestMapping(value = "/books", method = RequestMethod.POST)
public ModelAndView listBooksPOST(@ModelAttribute("booksFilter") BooksFilter filter,
BindingResult result) throws ParseException {
myMethod();
do here your minor difference
}
private returntype myMethod(){
LONG CODE
}
Spring MVC + JSON = 406 Not Acceptable
Today I too gone through the same issue. In my case, in web.xml I have
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
my url is having .html extension. Ex:.../getUsers.html. But I am returning JSON data in controller. .html extension will by default set accept type as html.
So I changed to the following:
web.xml:
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.html</url-pattern>
<url-pattern>*.json</url-pattern>
</servlet-mapping>
URL:
.../getUsers.json
Everything is working fine now. Hope it helps.
HTTP Status 500 - Servlet.init() for servlet Dispatcher threw exception
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>teste4</groupId>
<artifactId>teste4</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<repositories>
<repository>
<id>prime-repo</id>
<name>PrimeFaces Maven Repository</name>
<url>http://repository.primefaces.org</url>
<layout>default</layout>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>org.primefaces.themes</groupId>
<artifactId>bootstrap</artifactId>
<version>1.0.9</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.27</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.2.7.Final</version>
</dependency>
</dependencies>
</project>
How to solve the “failed to lazily initialize a collection of role” Hibernate exception
One of the best solutions is to add the following in your application.properties file: spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true
No WebApplicationContext found: no ContextLoaderListener registered?
And if you would like to use an existing context, rather than a new context which would be loaded from xml configuration by org.springframework.web.context.ContextLoaderListener, then see -> https://stackoverflow.com/a/40694787/3004747
How to get active user's UserDetails
And if you need authorized user in templates (e.g. JSP) use
<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>
<sec:authentication property="principal.yourCustomField"/>
together with
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
<version>${spring-security.version}</version>
</dependency>
Injection of autowired dependencies failed;
Do you have a bean declared in your context file that has an id of "articleService"? I believe that autowiring matches the id of a bean in your context files with the variable name that you are attempting to Autowire.
@Scope("prototype") bean scope not creating new bean
You can create static class inside your controller like this :
@Controller
public class HomeController {
@Autowired
private LoginServiceConfiguration loginServiceConfiguration;
@RequestMapping(value = "/view", method = RequestMethod.GET)
public ModelAndView display(HttpServletRequest req) {
ModelAndView mav = new ModelAndView("home");
mav.addObject("loginAction", loginServiceConfiguration.loginAction());
return mav;
}
@Configuration
public static class LoginServiceConfiguration {
@Bean(name = "loginActionBean")
@Scope("prototype")
public LoginAction loginAction() {
return new LoginAction();
}
}
}
Spring MVC - HttpMediaTypeNotAcceptableException
I had the same issue, but i had figured out that basically what happens when spring is trying to render the response it will try to serialize it according to the media type you have specified and by using getter and setter methods in your class
before my class used to look like below
public class MyRestResponse{
private String message;
}
solution looks like below
public class MyRestResponse{
private String message;
public void setMessage(String msg){
this.message = msg;
}
public String getMessage(){
return this.message;
}
}
that's how it worked for me
Get UserDetails object from Security Context in Spring MVC controller
You can use below code to find out principal (user email who logged in)
org.opensaml.saml2.core.impl.NameIDImpl principal =
(NameIDImpl) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
String email = principal.getValue();
This code is written on top of SAML.
Spring MVC UTF-8 Encoding
Easiest solution to force UTF-8 encoding in Spring MVC returning String:
In @RequestMapping, use:
produces = MediaType.APPLICATION_JSON_VALUE + "; charset=utf-8"
What is Model in ModelAndView from Spring MVC?
@RequestMapping(value="/register",method=RequestMethod.POST)
public ModelAndView postRegisterPage(HttpServletRequest request,HttpServletResponse response,
@ModelAttribute("bean")RegisterModel bean)
{
RegisterService service = new RegisterService();
boolean b = service.saveUser(bean);
if(b)
{
return new ModelAndView("registerPage","errorMessage","Registered Successfully!");
}
else
{
return new ModelAndView("registerPage","errorMessage","ERROR!!");
}
}
/* "registerPage" is the .jsp page -> which will viewed.
/* "errorMessage" is the variable that could be displayed in page using -> **${errorMessage}**
/* "Registered Successfully!" or "ERROR!!" is the message will be printed based on **if-else condition**
Spring @ContextConfiguration how to put the right location for the xml
This is a maven specific problem I think. Maven does not copy the files form /src/main/resources to the target-test folder. You will have to do this yourself by configuring the resources plugin, if you absolutely want to go this way.
An easier way is to instead put a test specific context definition in the /src/test/resources directory and load via:
@ContextConfiguration(locations = { "classpath:mycontext.xml" })
When using Spring Security, what is the proper way to obtain current username (i.e. SecurityContext) information in a bean?
You could use Spring AOP aproach. For example if you have some service, that needs to know current principal. You could introduce custom annotation i.e. @Principal , which indicate that this Service should be principal dependent.
public class SomeService {
private String principal;
@Principal
public setPrincipal(String principal){
this.principal=principal;
}
}
Then in your advice, which I think needs to extend MethodBeforeAdvice, check that particular service has @Principal annotation and inject Principal name, or set it to 'ANONYMOUS' instead.
How to add a second css class with a conditional value in razor MVC 4
You can use String.Format function to add second class based on condition:
<div class="@String.Format("details {0}", Details.Count > 0 ? "show" : "hide")">
What’s the best way to get an HTTP response code from a URL?
Update using the wonderful requests library. Note we are using the HEAD request, which should happen more quickly then a full GET or POST request.
import requests
try:
r = requests.head("https://stackoverflow.com")
print(r.status_code)
# prints the int of the status code. Find more at httpstatusrappers.com :)
except requests.ConnectionError:
print("failed to connect")
UTL_FILE.FOPEN() procedure not accepting path for directory?
You need to have your DBA modify the init.ora file, adding the directory you want to access to the 'utl_file_dir' parameter. Your database instance will then need to be stopped and restarted because init.ora is only read when the database is brought up.
You can view (but not change) this parameter by running the following query:
SELECT *
FROM V$PARAMETER
WHERE NAME = 'utl_file_dir'
Share and enjoy.
Is the LIKE operator case-sensitive with MSSQL Server?
All this talk about collation seem a bit over-complicated. Why not just use something like:
IF UPPER(@@VERSION) NOT LIKE '%AZURE%'
Then your check is case insensitive whatever the collation
Floating point comparison functions for C#
Although the second option is more general, the first option is better when you have an absolute tolerance, and when you have to execute many of these comparisons. If this comparison is say for every pixel in an image, the multiplication in the second options might slow your execution to unacceptable levels of performance.
Swift do-try-catch syntax
There are two important points to the Swift 2 error handling model: exhaustiveness and resiliency. Together, they boil down to your do/catch statement needing to catch every possible error, not just the ones you know you can throw.
Notice that you don't declare what types of errors a function can throw, only whether it throws at all. It's a zero-one-infinity sort of problem: as someone defining a function for others (including your future self) to use, you don't want to have to make every client of your function adapt to every change in the implementation of your function, including what errors it can throw. You want code that calls your function to be resilient to such change.
Because your function can't say what kind of errors it throws (or might throw in the future), the catch blocks that catch it errors don't know what types of errors it might throw. So, in addition to handling the error types you know about, you need to handle the ones you don't with a universal catch statement -- that way if your function changes the set of errors it throws in the future, callers will still catch its errors.
do {
let sandwich = try makeMeSandwich(kitchen)
print("i eat it \(sandwich)")
} catch SandwichError.NotMe {
print("Not me error")
} catch SandwichError.DoItYourself {
print("do it error")
} catch let error {
print(error.localizedDescription)
}
But let's not stop there. Think about this resilience idea some more. The way you've designed your sandwich, you have to describe errors in every place where you use them. That means that whenever you change the set of error cases, you have to change every place that uses them... not very fun.
The idea behind defining your own error types is to let you centralize things like that. You could define a description method for your errors:
extension SandwichError: CustomStringConvertible {
var description: String {
switch self {
case NotMe: return "Not me error"
case DoItYourself: return "Try sudo"
}
}
}
And then your error handling code can ask your error type to describe itself -- now every place where you handle errors can use the same code, and handle possible future error cases, too.
do {
let sandwich = try makeMeSandwich(kitchen)
print("i eat it \(sandwich)")
} catch let error as SandwichError {
print(error.description)
} catch {
print("i dunno")
}
This also paves the way for error types (or extensions on them) to support other ways of reporting errors -- for example, you could have an extension on your error type that knows how to present a UIAlertController for reporting the error to an iOS user.
Is it possible to display my iPhone on my computer monitor?
The latest SDKs (beginning with 2.2, I believe), include TV-Out functionality. With a special cable connected to the iPhone dock connector, a program can send RCA signals representing its current screen contents through the iPhone->RCA cable. If you have a TV Tuner for your computer (i.e. I have an EyeTV Hybrid) with RCA inputs, you can display the screen contents of your iPhone directly in the TV viewer.
Difference between static memory allocation and dynamic memory allocation
There are three types of allocation — static, automatic, and dynamic.
Static Allocation means, that the memory for your variables is allocated when the program starts. The size is fixed when the program is created. It applies to global variables, file scope variables, and variables qualified with static defined inside functions.
Automatic memory allocation occurs for (non-static) variables defined inside functions, and is usually stored on the stack (though the C standard doesn't mandate that a stack is used). You do not have to reserve extra memory using them, but on the other hand, have also limited control over the lifetime of this memory. E.g: automatic variables in a function are only there until the function finishes.
void func() {
int i; /* `i` only exists during `func` */
}
Dynamic memory allocation is a bit different. You now control the exact size and the lifetime of these memory locations. If you don't free it, you'll run into memory leaks, which may cause your application to crash, since at some point of time, system cannot allocate more memory.
int* func() {
int* mem = malloc(1024);
return mem;
}
int* mem = func(); /* still accessible */
In the upper example, the allocated memory is still valid and accessible, even though the function terminated. When you are done with the memory, you have to free it:
free(mem);
HREF="" automatically adds to current page URL (in PHP). Can't figure it out
This is how a browser interprets and empty href. It assumes you want to link back to the page that you are on. This is the same as if you dont assign an action to a <form> element.
If you add any word in the href it will append it to the current page unless you:
- Add a slash
/to the front of it telling it to append it to your base url e.g.http://www.whatever.com/something - add a
#sign in which case it is an in-page anchor - or a valid URL
EDIT: It was suggested that I add a link to help clarify the situation. I found the following site that I think does a really good job explaining the href attribute of anchor tags and how it interprets URL paths. It is not incredibly technical and very human-readable. It uses lots of examples to illustrate the differences between the path types: http://www.mediacollege.com/internet/html/hyperlinks.html
Installation error: INSTALL_FAILED_OLDER_SDK
I've changed my android:minSdkVersion and android:targetSdkVersion to 18 from 21:
uses-sdk android:minSdkVersion="18" android:targetSdkVersion="18"
Now I can install my app successfully.
CodeIgniter query: How to move a column value to another column in the same row and save the current time in the original column?
Try like this:
$data = array('current_login' => date('Y-m-d H:i:s'));
$this->db->set('last_login', 'current_login', false);
$this->db->where('id', 'some_id');
$this->db->update('login_table', $data);
Pay particular attention to the set() call's 3rd parameter. false prevents CodeIgniter from quoting the 2nd parameter -- this allows the value to be treated as a table column and not a string value. For any data that doesn't need to special treatment, you can lump all of those declarations into the $data array.
The query generated by above code:
UPDATE `login_table`
SET last_login = current_login, `current_login` = '2018-01-18 15:24:13'
WHERE `id` = 'some_id'
How do I remove a submodule?
To remove a submodule added using:
git submodule add [email protected]:repos/blah.git lib/blah
Run:
git rm lib/blah
That's it.
For old versions of git (circa ~1.8.5) use:
git submodule deinit lib/blah
git rm lib/blah
git config -f .gitmodules --remove-section submodule.lib/blah
How to Load RSA Private Key From File
Two things. First, you must base64 decode the mykey.pem file yourself. Second, the openssl private key format is specified in PKCS#1 as the RSAPrivateKey ASN.1 structure. It is not compatible with java's PKCS8EncodedKeySpec, which is based on the SubjectPublicKeyInfo ASN.1 structure. If you are willing to use the bouncycastle library you can use a few classes in the bouncycastle provider and bouncycastle PKIX libraries to make quick work of this.
import java.io.BufferedReader;
import java.io.FileReader;
import java.security.KeyPair;
import java.security.Security;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
// ...
String keyPath = "mykey.pem";
BufferedReader br = new BufferedReader(new FileReader(keyPath));
Security.addProvider(new BouncyCastleProvider());
PEMParser pp = new PEMParser(br);
PEMKeyPair pemKeyPair = (PEMKeyPair) pp.readObject();
KeyPair kp = new JcaPEMKeyConverter().getKeyPair(pemKeyPair);
pp.close();
samlResponse.sign(Signature.getInstance("SHA1withRSA").toString(), kp.getPrivate(), certs);
How can I use delay() with show() and hide() in Jquery
Pass a duration to show() and hide():
When a duration is provided,
.show()becomes an animation method.
E.g. element.delay(1000).show(0)
Delete ActionLink with confirm dialog
Any click event before for update /edit/delete records message box alerts the user and if "Ok" proceed for the action else "cancel" remain unchanged. For this code no need to right separate java script code. it works for me
<a asp-action="Delete" asp-route-ID="@Item.ArtistID" onclick = "return confirm('Are you sure you wish to remove this Artist?');">Delete</a>
Which terminal command to get just IP address and nothing else?
I wanted something simple that worked as a Bash alias. I found that hostname -I works best for me (hostname v3.15). hostname -i returns the loopback IP, for some reason, but hostname -I gives me the correct IP for wlan0, and without having to pipe output through grep or awk. A drawback is that hostname -I will output all IPs, if you have more than one.
Check cell for a specific letter or set of letters
Some options without REGEXMATCH, since you might want to be case insensitive and not want say blast or ablative to trigger a YES. Using comma as the delimiter, as in the OP, and for the moment ignoring the IF condition:
First very similar to @user1598086's answer:
=FIND("bla",A1)
Is case sensitive but returns #VALUE! rather than NO and a number rather than YES (both of which can however be changed to NO/YES respectively).
=SEARCH("bla",A1)
Case insensitive, so treats Black and black equally. Returns as above.
The former (for the latter equivalent) to indicate whether bla present after the first three characters in A1:
=FIND("bla",A1,4)
Returns a number for blazer, black but #VALUE! for blazer, blue.
To find Bla only when a complete word on its own (ie between spaces - not at the start or end of a 'sentence'):
=SEARCH(" Bla ",A1)
Since the return in all cases above is either a number ("found", so YES preferred) or #VALUE! we can use ISERROR to test for #VALUE! within an IF formula, for instance taking the first example above:
=if(iserror(FIND("bla",A1)),"NO","YES")
Longer than the regexmatch but the components are easily adjustable.
How to get current class name including package name in Java?
use this.getClass().getName() to get packageName.className and use this.getClass().getSimpleName() to get only class name
Windows could not start the SQL Server (MSSQLSERVER) on Local Computer... (error code 3417)
i had the same problem before
the error code 3417 : the SQL SERVER cannot start the master database, without master db SQL SERVER can't start MSSQLSERVER_3417
The master database records all the system-level information for a SQL Server system. This includes instance-wide metadata such as logon accounts, endpoints, linked servers, and system configuration settings. In SQL Server, system objects are no longer stored in the master database; instead, they are stored in the Resource database. Also, master is the database that records the existence of all other databases and the location of those database files and records the initialization information for SQL Server. Therefore, SQL Server cannot start if the master database is unavailable MSDN Master DB so you need to reconfigure all settings after restoring master db
solutions
Deny direct access to all .php files except index.php
An easy solution is to rename all non-index.php files to .inc, then deny access to *.inc files. I use this in a lot of my projects and it works perfectly fine.
How to get the file extension in PHP?
A better method is using strrpos + substr (faster than explode for that) :
$userfile_name = $_FILES['image']['name'];
$userfile_extn = substr($userfile_name, strrpos($userfile_name, '.')+1);
But, to check the type of a file, using mime_content_type is a better way : http://www.php.net/manual/en/function.mime-content-type.php
What's the most appropriate HTTP status code for an "item not found" error page
/**
* {@code 422 Unprocessable Entity}.
* @see <a href="https://tools.ietf.org/html/rfc4918#section-11.2">WebDAV</a>
*/
UNPROCESSABLE_ENTITY(422, "Unprocessable Entity")
Get item in the list in Scala?
Safer is to use lift so you can extract the value if it exists and fail gracefully if it does not.
data.lift(2)
This will return None if the list isn't long enough to provide that element, and Some(value) if it is.
scala> val l = List("a", "b", "c")
scala> l.lift(1)
Some("b")
scala> l.lift(5)
None
Whenever you're performing an operation that may fail in this way it's great to use an Option and get the type system to help make sure you are handling the case where the element doesn't exist.
Explanation:
This works because List's apply (which sugars to just parentheses, e.g. l(index)) is like a partial function that is defined wherever the list has an element. The List.lift method turns the partial apply function (a function that is only defined for some inputs) into a normal function (defined for any input) by basically wrapping the result in an Option.
What do *args and **kwargs mean?
Just to clarify how to unpack the arguments, and take care of missing arguments etc.
def func(**keyword_args):
#-->keyword_args is a dictionary
print 'func:'
print keyword_args
if keyword_args.has_key('b'): print keyword_args['b']
if keyword_args.has_key('c'): print keyword_args['c']
def func2(*positional_args):
#-->positional_args is a tuple
print 'func2:'
print positional_args
if len(positional_args) > 1:
print positional_args[1]
def func3(*positional_args, **keyword_args):
#It is an error to switch the order ie. def func3(**keyword_args, *positional_args):
print 'func3:'
print positional_args
print keyword_args
func(a='apple',b='banana')
func(c='candle')
func2('apple','banana')#It is an error to do func2(a='apple',b='banana')
func3('apple','banana',a='apple',b='banana')
func3('apple',b='banana')#It is an error to do func3(b='banana','apple')
Use dynamic variable names in `dplyr`
Here's another version, and it's arguably a bit simpler.
multipetal <- function(df, n) {
varname <- paste("petal", n, sep=".")
df<-mutate_(df, .dots=setNames(paste0("Petal.Width*",n), varname))
df
}
for(i in 2:5) {
iris <- multipetal(df=iris, n=i)
}
> head(iris)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species petal.2 petal.3 petal.4 petal.5
1 5.1 3.5 1.4 0.2 setosa 0.4 0.6 0.8 1
2 4.9 3.0 1.4 0.2 setosa 0.4 0.6 0.8 1
3 4.7 3.2 1.3 0.2 setosa 0.4 0.6 0.8 1
4 4.6 3.1 1.5 0.2 setosa 0.4 0.6 0.8 1
5 5.0 3.6 1.4 0.2 setosa 0.4 0.6 0.8 1
6 5.4 3.9 1.7 0.4 setosa 0.8 1.2 1.6 2
PSQLException: current transaction is aborted, commands ignored until end of transaction block
I had the same issue but then realised there is a table with the same name in the database. After deleting that I was able to import the file.
How to handle Pop-up in Selenium WebDriver using Java
You can handle popup window or alert box:
Alert alert = driver.switchTo().alert();
alert.accept();
You can also decline the alert box:
Alert alert = driver.switchTo().alert();
alert().dismiss();
When must we use NVARCHAR/NCHAR instead of VARCHAR/CHAR in SQL Server?
Both the two most upvoted answers are wrong. It should have nothing to do with "store different/multiple languages". You can support Spanish characters like ñ and English, with just common varchar field and Latin1_General_CI_AS COLLATION, e.g.
Short Version
You should use NVARCHAR/NCHAR whenever the ENCODING, which is determined by COLLATION of the field, doesn't support the characters needed.
Also, depending on the SQL Server version, you can use specific COLLATIONs, like Latin1_General_100_CI_AS_SC_UTF8 which is available since SQL Server 2019. Setting this collation on a VARCHAR field (or entire table/database), will use UTF-8 ENCODING for storing and handling the data on that field, allowing fully support UNICODE characters, and hence any languages embraced by it.
To FULLY UNDERSTAND:
To fully understand what I'm about to explain, it's mandatory to have the concepts of UNICODE, ENCODING and COLLATION all extremely clear in your head. If you don't, then first take a look below at my humble and simplified explanation on "What is UNICODE, ENCODING, COLLATION and UTF-8, and how they are related" section and supplied documentation links. Also, everything I say here is specific to Microsoft SQL Server, and how it stores and handles data in char/nchar and varchar/nvarchar fields.
Let's say we wanna store a peculiar text on our MSSQL Server database. It could be an Instagram comment as "I love stackoverflow! ".
The plain English part would be perfectly supported even by ASCII, but since there are also an emoji, which is a character specified in the UNICODE standard, we need an ENCODING that supports this Unicode character.
MSSQL Server uses the COLLATION to determine what ENCODING is used on char/nchar/varchar/nvarchar fields. So, differently than a lot think, COLLATION is not only about sorting and comparing data, but also about ENCODING, and by consequence: how our data will be stored!
So, HOW WE KNOW WHAT IS THE ENCODING USED BY OUR COLLATION? With this:
SELECT COLLATIONPROPERTY( 'Latin1_General_CI_AI' , 'CodePage' ) AS [CodePage]
--returns 1252
This simple SQL returns the Windows Code Page for a COLLATION. A Windows Code Page is nothing more than another mapping to ENCODINGs. For the Latin1_General_CI_AI COLLATION it returns the Windows Code Page code 1252 , that maps to Windows-1252 ENCODING.
So, for a varchar column, with Latin1_General_CI_AI COLLATION, this field will handle its data using the Windows-1252 ENCODING, and only correctly store characters supported by this encoding.
If we check the Windows-1252 ENCODING specification Character List for Windows-1252, we will find out that this encoding won't support our emoji character. And if we still try it out:
OK, SO HOW CAN WE SOLVE THIS?? Actually, it depends, and that is GOOD!
NCHAR/NVARCHAR
Before SQL Server 2019 all we had was NCHAR and NVARCHAR fields. Some say they are UNICODE fields. THAT IS WRONG!. Again, it depends on the field's COLLATION and also SQLServer Version.
Microsoft's "nchar and nvarchar (Transact-SQL)" documentation specifies perfectly:
Starting with SQL Server 2012 (11.x), when a Supplementary Character (SC) enabled collation is used, these data types store the full range of Unicode character data and use the UTF-16 character encoding. If a non-SC collation is specified, then these data types store only the subset of character data supported by the UCS-2 character encoding.
In other words, if we use SQL Server older that 2012, like SQL Server 2008 R2 for example, the ENCODING for those fields will use UCS-2 ENCODING which support a subset of UNICODE. But if we use SQL Server 2012 or newer, and define a COLLATION that has Supplementary Character enabled, than with our field will use the UTF-16 ENCODING, that fully supports UNICODE.
BUT WHAIT, THERE IS MORE! WE CAN USE UTF-8 NOW!!
CHAR/VARCHAR
Starting with SQL Server 2019, WE CAN USE CHAR/VARCHAR fields and still fully support UNICODE using UTF-8 ENCODING!!!
From Microsoft's "char and varchar (Transact-SQL)" documentation:
Starting with SQL Server 2019 (15.x), when a UTF-8 enabled collation is used, these data types store the full range of Unicode character data and use the UTF-8 character encoding. If a non-UTF-8 collation is specified, then these data types store only a subset of characters supported by the corresponding code page of that collation.
Again, in other words, if we use SQL Server older that 2019, like SQL Server 2008 R2 for example, we need to check the ENCODING using the method explained before. But if we use SQL Server 2019 or newer, and define a COLLATION like Latin1_General_100_CI_AS_SC_UTF8, then our field will use UTF-8 ENCODING which is by far the most used and efficient encoding that supports all the UNICODE characters.
Bonus Information:
Regarding the OP's observation on "I have seen that most of the European languages (German, Italian, English, ...) are fine in the same database in VARCHAR columns", I think it's nice to know why it is:
For the most common COLLATIONs, like the default ones as Latin1_General_CI_AI or SQL_Latin1_General_CP1_CI_AS the ENCODING will be Windows-1252 for varchar fields. If we take a look on it's documentation, we can see that it supports:
English, Irish, Italian, Norwegian, Portuguese, Spanish, Swedish. Plus also German, Finnish and French. And Dutch except the ? character
But as I said before, it's not about language, it's about what characters do you expect to support/store, as shown in the emoji example, or some sentence like "The electric resistance of a lithium battery is 0.5O" where we have again plain English, and a Greek letter/character "omega" (which is the symbol for resistance in ohms), which won't be correctly handled by Windows-1252 ENCODING.
Conclusion:
So, there it is! When use char/nchar and varchar/nvarchar depends on the characters that you want to support, and also the version of your SQL Server that will determines which COLLATIONs and hence the ENCODINGs you have available.
What is UNICODE, ENCODING, COLLATION and UTF-8, and how they are related
Note: all the explanations below are simplifications. Please, refer to the supplied documentation links to know all the details about those concepts.
UNICODE- Is a standard, a convention, that aims to regulate all the characters in a unified and organized table. In this table, every character has an unique number. This number is commonly called character'scode point.
UNICODE IS NOT AN ENCODING!ENCODING- Is a mapping between a character and a byte/bytes sequence. So a encoding is used to "transform" a character to bytes and also the other way around, from bytes to a character. Among the most popular ones areUTF-8,ISO-8859-1,Windows-1252andASCII. You can think of it as a "conversion table" (i really simplified here).COLLATION- That one is important. Even Microsoft's documentation doesn't let this clear as it should be. A Collation specifies how your data would be sorted, compared, AND STORED!. Yeah, I bet you was not expecting for that last one, right!? The collations onSQL Serverdetermines too what would be theENCODINGused on that particularchar/nchar/varchar/nvarcharfield.ASCII ENCODING- Was one of the firsts encodings. It is both the character table (like an own tiny version ofUNICODE) and its byte mappings. So it doesn't map a byte toUNICODE, but map a byte to its own character's table. Also, it always use only 7bits, and supported 128 different characters. It was enough to support all English letters upper and down cased, numbers, punctuation and some other limited number of characters. The problem with ASCII is that since it only used 7bits and almost every computer was 8bits at the time, there were another 128 possibilities of characters to be "explored", and everybody started to map this "available" bytes to its own table of characters, creating a lot of differentENCODINGs.UTF-8 ENCODING- This is anotherENCODING, one of the most (if not the most) usedENCODINGaround. It uses variable byte width (one character can be from 1 to 6 bytes long, by specification) and fully supports allUNICODEcharacters.Windows-1252 ENCODING- Also one of the most usedENCODING, it's widely used on SQL Server. It's fixed-size, so every one character is always 1byte. It also supports a lot of accents, from various languages but doesn't support all existing, nor supportsUNICODE. That's why yourvarcharfield with a common collation likeLatin1_General_CI_ASsupportsá,é,ñcharacters, even that it isn't using a supportiveUNICODEENCODING.
Resources:
https://blog.greglow.com/2019/07/25/sql-think-that-varchar-characters-if-so-think-again/
https://medium.com/@apiltamang/unicode-utf-8-and-ascii-encodings-made-easy-5bfbe3a1c45a
https://www.johndcook.com/blog/2019/09/09/how-utf-8-works/
https://www.w3.org/International/questions/qa-what-is-encoding
https://en.wikipedia.org/wiki/List_of_Unicode_characters
https://www.fileformat.info/info/charset/windows-1252/list.htm
https://docs.microsoft.com/en-us/sql/t-sql/data-types/char-and-varchar-transact-sql?view=sql-server-ver15
https://docs.microsoft.com/en-us/sql/t-sql/data-types/nchar-and-nvarchar-transact-sql?view=sql-server-ver15
https://docs.microsoft.com/en-us/sql/t-sql/statements/windows-collation-name-transact-sql?view=sql-server-ver15
https://docs.microsoft.com/en-us/sql/t-sql/statements/sql-server-collation-name-transact-sql?view=sql-server-ver15
https://docs.microsoft.com/en-us/sql/relational-databases/collations/collation-and-unicode-support?view=sql-server-ver15#SQL-collations
SQL Server default character encoding
https://en.wikipedia.org/wiki/Windows_code_page
Scikit-learn train_test_split with indices
The docs mention train_test_split is just a convenience function on top of shuffle split.
I just rearranged some of their code to make my own example. Note the actual solution is the middle block of code. The rest is imports, and setup for a runnable example.
from sklearn.model_selection import ShuffleSplit
from sklearn.utils import safe_indexing, indexable
from itertools import chain
import numpy as np
X = np.reshape(np.random.randn(20),(10,2)) # 10 training examples
y = np.random.randint(2, size=10) # 10 labels
seed = 1
cv = ShuffleSplit(random_state=seed, test_size=0.25)
arrays = indexable(X, y)
train, test = next(cv.split(X=X))
iterator = list(chain.from_iterable((
safe_indexing(a, train),
safe_indexing(a, test),
train,
test
) for a in arrays)
)
X_train, X_test, train_is, test_is, y_train, y_test, _, _ = iterator
print(X)
print(train_is)
print(X_train)
Now I have the actual indexes: train_is, test_is
What is the proper way to comment functions in Python?
Use docstrings.
This is the built-in suggested convention in PyCharm for describing function using docstring comments:
def test_function(p1, p2, p3):
"""
test_function does blah blah blah.
:param p1: describe about parameter p1
:param p2: describe about parameter p2
:param p3: describe about parameter p3
:return: describe what it returns
"""
pass
'uint32_t' identifier not found error
On Windows I usually use windows types. To use it you have to include <Windows.h>.
In this case uint32_t is UINT32 or just UINT.
All types definitions are here: http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751%28v=vs.85%29.aspx
What exactly does Double mean in java?
In a comment on @paxdiablo's answer, you asked:
"So basically, is it better to use Double than Float?"
That is a complicated question. I will deal with it in two parts
Deciding between double versus float
On the one hand, a double occupies 8 bytes versus 4 bytes for a float. If you have many of them, this may be significant, though it may also have no impact. (Consider the case where the values are in fields or local variables on a 64bit machine, and the JVM aligns them on 64 bit boundaries.) Additionally, floating point arithmetic with double values is typically slower than with float values ... though once again this is hardware dependent.
On the other hand, a double can represent larger (and smaller) numbers than a float and can represent them with more than twice the precision. For the details, refer to Wikipedia.
The tricky question is knowing whether you actually need the extra range and precision of a double. In some cases it is obvious that you need it. In others it is not so obvious. For instance if you are doing calculations such as inverting a matrix or calculating a standard deviation, the extra precision may be critical. On the other hand, in some cases not even double is going to give you enough precision. (And beware of the trap of expecting float and double to give you an exact representation. They won't and they can't!)
There is a branch of mathematics called Numerical Analysis that deals with the effects of rounding error, etc in practical numerical calculations. It used to be a standard part of computer science courses ... back in the 1970's.
Deciding between Double versus Float
For the Double versus Float case, the issues of precision and range are the same as for double versus float, but the relative performance measures will be slightly different.
A
Double(on a 32 bit machine) typically takes 16 bytes + 4 bytes for the reference, compared with 12 + 4 bytes for aFloat. Compare this to 8 bytes versus 4 bytes for thedoubleversusfloatcase. So the ratio is 5 to 4 versus 2 to 1.Arithmetic involving
DoubleandFloattypically involves dereferencing the pointer and creating a new object to hold the result (depending on the circumstances). These extra overheads also affect the ratios in favor of theDoublecase.
Correctness
Having said all that, the most important thing is correctness, and this typically means getting the most accurate answer. And even if accuracy is not critical, it is usually not wrong to be "too accurate". So, the simple "rule of thumb" is to use double in preference to float, UNLESS there is an overriding performance requirement, AND you have solid evidence that using float will make a difference with respect to that requirement.
How do I send a file in Android from a mobile device to server using http?
Wrap it all up in an Async task to avoid threading errors.
public class AsyncHttpPostTask extends AsyncTask<File, Void, String> {
private static final String TAG = AsyncHttpPostTask.class.getSimpleName();
private String server;
public AsyncHttpPostTask(final String server) {
this.server = server;
}
@Override
protected String doInBackground(File... params) {
Log.d(TAG, "doInBackground");
HttpClient http = AndroidHttpClient.newInstance("MyApp");
HttpPost method = new HttpPost(this.server);
method.setEntity(new FileEntity(params[0], "text/plain"));
try {
HttpResponse response = http.execute(method);
BufferedReader rd = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));
final StringBuilder out = new StringBuilder();
String line;
try {
while ((line = rd.readLine()) != null) {
out.append(line);
}
} catch (Exception e) {}
// wr.close();
try {
rd.close();
} catch (IOException e) {
e.printStackTrace();
}
// final String serverResponse = slurp(is);
Log.d(TAG, "serverResponse: " + out.toString());
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
How to sum the values of a JavaScript object?
I came across this solution from @jbabey while trying to solve a similar problem. With a little modification, I got it right. In my case, the object keys are numbers (489) and strings ("489"). Hence to solve this, each key is parse. The following code works:
var array = {"nR": 22, "nH": 7, "totB": "2761", "nSR": 16, "htRb": "91981"}
var parskey = 0;
for (var key in array) {
parskey = parseInt(array[key]);
sum += parskey;
};
return(sum);
unique() for more than one variable
How about using unique() itself?
df <- data.frame(yad = c("BARBIE", "BARBIE", "BAKUGAN", "BAKUGAN"),
per = c("AYLIK", "AYLIK", "2 AYLIK", "2 AYLIK"),
hmm = 1:4)
df
# yad per hmm
# 1 BARBIE AYLIK 1
# 2 BARBIE AYLIK 2
# 3 BAKUGAN 2 AYLIK 3
# 4 BAKUGAN 2 AYLIK 4
unique(df[c("yad", "per")])
# yad per
# 1 BARBIE AYLIK
# 3 BAKUGAN 2 AYLIK
Marquee text in Android
With the above answer, you cannot set the speed or have flexibility for customizing the text view functionality. To have your own scroll speed and flexibility to customize marquee properties, use the following:
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:fadingEdge="horizontal"
android:lines="1"
android:id="@+id/myTextView"
android:padding="4dp"
android:scrollHorizontally="true"
android:singleLine="true"
android:text="Simple application that shows how to use marquee, with a long text" />
Within your activity:
private void setTranslation() {
TranslateAnimation tanim = new TranslateAnimation(
TranslateAnimation.ABSOLUTE, 1.0f * screenWidth,
TranslateAnimation.ABSOLUTE, -1.0f * screenWidth,
TranslateAnimation.ABSOLUTE, 0.0f,
TranslateAnimation.ABSOLUTE, 0.0f);
tanim.setDuration(1000);//set the duration
tanim.setInterpolator(new LinearInterpolator());
tanim.setRepeatCount(Animation.INFINITE);
tanim.setRepeatMode(Animation.ABSOLUTE);
textView.startAnimation(tanim);
}
Request format is unrecognized for URL unexpectedly ending in
In my case the error happened when i move from my local PC Windows 10 to a dedicated server with Windows 2012. The solution for was to add to the web.config the following lines
<webServices>
<protocols>
<add name="Documentation"/>
</protocols>
</webServices>
Convert generator object to list for debugging
Simply call list on the generator.
lst = list(gen)
lst
Be aware that this affects the generator which will not return any further items.
You also cannot directly call list in IPython, as it conflicts with a command for listing lines of code.
Tested on this file:
def gen():
yield 1
yield 2
yield 3
yield 4
yield 5
import ipdb
ipdb.set_trace()
g1 = gen()
text = "aha" + "bebe"
mylst = range(10, 20)
which when run:
$ python code.py
> /home/javl/sandbox/so/debug/code.py(10)<module>()
9
---> 10 g1 = gen()
11
ipdb> n
> /home/javl/sandbox/so/debug/code.py(12)<module>()
11
---> 12 text = "aha" + "bebe"
13
ipdb> lst = list(g1)
ipdb> lst
[1, 2, 3, 4, 5]
ipdb> q
Exiting Debugger.
General method for escaping function/variable/debugger name conflicts
There are debugger commands p and pp that will print and prettyprint any expression following them.
So you could use it as follows:
$ python code.py
> /home/javl/sandbox/so/debug/code.py(10)<module>()
9
---> 10 g1 = gen()
11
ipdb> n
> /home/javl/sandbox/so/debug/code.py(12)<module>()
11
---> 12 text = "aha" + "bebe"
13
ipdb> p list(g1)
[1, 2, 3, 4, 5]
ipdb> c
There is also an exec command, called by prefixing your expression with !, which forces debugger to take your expression as Python one.
ipdb> !list(g1)
[]
For more details see help p, help pp and help exec when in debugger.
ipdb> help exec
(!) statement
Execute the (one-line) statement in the context of
the current stack frame.
The exclamation point can be omitted unless the first word
of the statement resembles a debugger command.
To assign to a global variable you must always prefix the
command with a 'global' command, e.g.:
(Pdb) global list_options; list_options = ['-l']
Can I pass an array as arguments to a method with variable arguments in Java?
It's ok to pass an array - in fact it amounts to the same thing
String.format("%s %s", "hello", "world!");
is the same as
String.format("%s %s", new Object[] { "hello", "world!"});
It's just syntactic sugar - the compiler converts the first one into the second, since the underlying method is expecting an array for the vararg parameter.
See
JavaScript implementation of Gzip
Most browsers can decompress gzip on the fly. That might be a better option than a javascript implementation.
CSS: How can I set image size relative to parent height?
Use max-width property of CSS, like this :
img{
max-width:100%;
}
Select a dummy column with a dummy value in SQL?
If you meant just ABC as simple value, answer above is the one that works fine.
If you meant concatenation of values of rows that are not selected by your main query, you will need to use a subquery.
Something like this may work:
SELECT t1.col1,
t1.col2,
(SELECT GROUP_CONCAT(col2 SEPARATOR '') FROM Table1 t2 WHERE t2.col1 != 0) as col3
FROM Table1 t1
WHERE t1.col1 = 0;
Actual syntax maybe a bit off though
how to get yesterday's date in C#
Use DateTime.AddDays() method with value of -1
var yesterday = DateTime.Today.AddDays(-1);
That will give you : {6/28/2012 12:00:00 AM}
You can also use
DateTime.Now.AddDays(-1)
That will give you previous date with the current time e.g. {6/28/2012 10:30:32 AM}
How to fix error Base table or view not found: 1146 Table laravel relationship table?
It seems Laravel is trying to use category_posts table (because of many-to-many relationship). But you don't have this table, because you've created category_post table. Change name of the table to category_posts.
How can I use querySelector on to pick an input element by name?
So ... you need to change some things in your code
<form method="POST" id="form-pass">
Password: <input type="text" name="pwd" id="input-pwd">
<input type="submit" value="Submit">
</form>
<script>
var form = document.querySelector('#form-pass');
var pwd = document.querySelector('#input-pwd');
pwd.focus();
form.onsubmit = checkForm;
function checkForm() {
alert(pwd.value);
}
</script>
Try this way.
Regex replace uppercase with lowercase letters
Try this
- Find:
([A-Z])([A-Z]+)\b - Replace:
$1\L$2
Make sure case sensitivity is on (Alt + C)
How do I fix MSB3073 error in my post-build event?
Following thing you should do before to run copy command if you facing some issue with copy command
- open solution as a administrator and build the solution.
- if you have problem like "0 File(s) copied" check you source and destination path. might you are using wrong path. it would be better if you run the same command in "command prompt" to check whether it is working fine or not.
how to kill the tty in unix
The simplest way is with the pkill command.
In your case:
pkill -9 -t pts/6
pkill -9 -t pts/9
pkill -9 -t pts/10
Regarding tty sessions, the commands below are always useful:
w - shows active terminal sessions
tty - shows your current terminal session (so you won't close it by accident)
last | grep logged - shows currently logged users
Sometimes we want to close all sessions of an idle user (ie. when connections are lost abruptly).
pkill -u username - kills all sessions of 'username' user.
And sometimes when we want to kill all our own sessions except the current one, so I made a script for it. There are some cosmetics and some interactivity (to avoid accidental running on the script).
#!/bin/bash
MYUSER=`whoami`
MYSESSION=`tty | cut -d"/" -f3-`
OTHERSESSIONS=`w $MYUSER | grep "^$MYUSER" | grep -v "$MYSESSION" | cut -d" " -f2`
printf "\e[33mCurrent session\e[0m: $MYUSER[$MYSESSION]\n"
if [[ ! -z $OTHERSESSIONS ]]; then
printf "\e[33mOther sessions:\e[0m\n"
w $MYUSER | egrep "LOGIN@|^$MYUSER" | grep -v "$MYSESSION" | column -t
echo ----------
read -p "Do you want to force close all your other sessions? [Y]Yes/[N]No: " answer
answer=`echo $answer | tr A-Z a-z`
confirm=("y" "yes")
if [[ "${confirm[@]}" =~ "$answer" ]]; then
for SESSION in $OTHERSESSIONS
do
pkill -9 -t $SESSION
echo Session $SESSION closed.
done
fi
else
echo "There are no other sessions for the user '$MYUSER'".
fi
Cannot change column used in a foreign key constraint
You can turn off foreign key checks:
SET FOREIGN_KEY_CHECKS = 0;
/* DO WHAT YOU NEED HERE */
SET FOREIGN_KEY_CHECKS = 1;
Please make sure to NOT use this on production and have a backup.
How can I make one python file run another?
You could use this script:
def run(runfile):
with open(runfile,"r") as rnf:
exec(rnf.read())
Syntax:
run("file.py")
JQuery create new select option
If you need to make single element you can use this construction:
$('<option/>', {
'class': this.dataID,
'text': this.s_dataValue
}).appendTo('.subCategory');
But if you need to print many elements you can use this construction:
function printOptions(arr){
jQuery.each(arr, function(){
$('<option/>', {
'value': this.dataID,
'text': this.s_dataValue
}).appendTo('.subCategory');
});
}
How do I send a POST request as a JSON?
for python 3.4.2 I found the following will work:
import urllib.request
import json
body = {'ids': [12, 14, 50]}
myurl = "http://www.testmycode.com"
req = urllib.request.Request(myurl)
req.add_header('Content-Type', 'application/json; charset=utf-8')
jsondata = json.dumps(body)
jsondataasbytes = jsondata.encode('utf-8') # needs to be bytes
req.add_header('Content-Length', len(jsondataasbytes))
response = urllib.request.urlopen(req, jsondataasbytes)
Java 8 optional: ifPresent return object orElseThrow exception
Two options here:
Replace ifPresent with map and use Function instead of Consumer
private String getStringIfObjectIsPresent(Optional<Object> object) {
return object
.map(obj -> {
String result = "result";
//some logic with result and return it
return result;
})
.orElseThrow(MyCustomException::new);
}
Use isPresent:
private String getStringIfObjectIsPresent(Optional<Object> object) {
if (object.isPresent()) {
String result = "result";
//some logic with result and return it
return result;
} else {
throw new MyCustomException();
}
}
How to show DatePickerDialog on Button click?
it works for me. if you want to enable future time for choose, you have to delete maximum date. You need to to do like followings.
btnDate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DialogFragment newFragment = new DatePickerFragment();
newFragment.show(getSupportFragmentManager(), "datePicker");
}
});
public static class DatePickerFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
DatePickerDialog dialog = new DatePickerDialog(getActivity(), this, year, month, day);
dialog.getDatePicker().setMaxDate(c.getTimeInMillis());
return dialog;
}
public void onDateSet(DatePicker view, int year, int month, int day) {
btnDate.setText(ConverterDate.ConvertDate(year, month + 1, day));
}
}
How to write a file or data to an S3 object using boto3
In boto 3, the 'Key.set_contents_from_' methods were replaced by
For example:
import boto3
some_binary_data = b'Here we have some data'
more_binary_data = b'Here we have some more data'
# Method 1: Object.put()
s3 = boto3.resource('s3')
object = s3.Object('my_bucket_name', 'my/key/including/filename.txt')
object.put(Body=some_binary_data)
# Method 2: Client.put_object()
client = boto3.client('s3')
client.put_object(Body=more_binary_data, Bucket='my_bucket_name', Key='my/key/including/anotherfilename.txt')
Alternatively, the binary data can come from reading a file, as described in the official docs comparing boto 2 and boto 3:
Storing Data
Storing data from a file, stream, or string is easy:
# Boto 2.x from boto.s3.key import Key key = Key('hello.txt') key.set_contents_from_file('/tmp/hello.txt') # Boto 3 s3.Object('mybucket', 'hello.txt').put(Body=open('/tmp/hello.txt', 'rb'))
PYTHONPATH vs. sys.path
Neither hacking PYTHONPATH nor sys.path is a good idea due to the before mentioned reasons. And for linking the current project into the site-packages folder there is actually a better way than python setup.py develop, as explained here:
pip install --editable path/to/project
If you don't already have a setup.py in your project's root folder, this one is good enough to start with:
from setuptools import setup
setup('project')
SQL Format as of Round off removing decimals
SELECT CONVERT(INT, 11.4)
RESULT: 11
SELECT CONVERT(INT, 11.6)
RESULT: 11
Why should we typedef a struct so often in C?
Let's start with the basics and work our way up.
Here is an example of Structure definition:
struct point
{
int x, y;
};
Here the name point is optional.
A Structure can be declared during its definition or after.
Declaring during definition
struct point
{
int x, y;
} first_point, second_point;
Declaring after definition
struct point
{
int x, y;
};
struct point first_point, second_point;
Now, carefully note the last case above; you need to write struct point to declare Structures of that type if you decide to create that type at a later point in your code.
Enter typedef. If you intend to create new Structure ( Structure is a custom data-type) at a later time in your program using the same blueprint, using typedef during its definition might be a good idea since you can save some typing moving forward.
typedef struct point
{
int x, y;
} Points;
Points first_point, second_point;
A word of caution while naming your custom type
Nothing prevents you from using _t suffix at the end of your custom type name but POSIX standard reserves the use of suffix _t to denote standard library type names.
Stopping python using ctrl+c
On Windows, the only sure way is to use CtrlBreak. Stops every python script instantly!
(Note that on some keyboards, "Break" is labeled as "Pause".)
Differences between contentType and dataType in jQuery ajax function
From the documentation:
contentType (default: 'application/x-www-form-urlencoded; charset=UTF-8')
Type: String
When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8", which is fine for most cases. If you explicitly pass in a content-type to $.ajax(), then it'll always be sent to the server (even if no data is sent). If no charset is specified, data will be transmitted to the server using the server's default charset; you must decode this appropriately on the server side.
and:
dataType (default: Intelligent Guess (xml, json, script, or html))
Type: String
The type of data that you're expecting back from the server. If none is specified, jQuery will try to infer it based on the MIME type of the response (an XML MIME type will yield XML, in 1.4 JSON will yield a JavaScript object, in 1.4 script will execute the script, and anything else will be returned as a string).
They're essentially the opposite of what you thought they were.
How to use the COLLATE in a JOIN in SQL Server?
Correct syntax looks like this. See MSDN.
SELECT *
FROM [FAEB].[dbo].[ExportaComisiones] AS f
JOIN [zCredifiel].[dbo].[optPerson] AS p
ON p.vTreasuryId COLLATE Latin1_General_CI_AS = f.RFC COLLATE Latin1_General_CI_AS
Conditional Formatting (IF not empty)
Does this work for you:
You find this dialog on the Home ribbon, under the Styles group, the Conditional Formatting menu, New rule....
How to use HTTP GET in PowerShell?
In PowerShell v3, have a look at the Invoke-WebRequest and Invoke-RestMethod e.g.:
$msg = Read-Host -Prompt "Enter message"
$encmsg = [System.Web.HttpUtility]::UrlEncode($msg)
Invoke-WebRequest -Uri "http://smsserver/SNSManager/msgSend.jsp?uid&to=smartsms:*+001XXXXXX&msg=$encmsg&encoding=windows-1255"
PHP convert string to hex and hex to string
For any char with ord($char) < 16 you get a HEX back which is only 1 long. You forgot to add 0 padding.
This should solve it:
<?php
function strToHex($string){
$hex = '';
for ($i=0; $i<strlen($string); $i++){
$ord = ord($string[$i]);
$hexCode = dechex($ord);
$hex .= substr('0'.$hexCode, -2);
}
return strToUpper($hex);
}
function hexToStr($hex){
$string='';
for ($i=0; $i < strlen($hex)-1; $i+=2){
$string .= chr(hexdec($hex[$i].$hex[$i+1]));
}
return $string;
}
// Tests
header('Content-Type: text/plain');
function test($expected, $actual, $success) {
if($expected !== $actual) {
echo "Expected: '$expected'\n";
echo "Actual: '$actual'\n";
echo "\n";
$success = false;
}
return $success;
}
$success = true;
$success = test('00', strToHex(hexToStr('00')), $success);
$success = test('FF', strToHex(hexToStr('FF')), $success);
$success = test('000102FF', strToHex(hexToStr('000102FF')), $success);
$success = test('???§P?§P ?§T?§?', hexToStr(strToHex('???§P?§P ?§T?§?')), $success);
echo $success ? "Success" : "\nFailed";
How to iterate through property names of Javascript object?
In JavaScript 1.8.5, Object.getOwnPropertyNames returns an array of all properties found directly upon a given object.
Object.getOwnPropertyNames ( obj )
and another method Object.keys, which returns an array containing the names of all of the given object's own enumerable properties.
Object.keys( obj )
I used forEach to list values and keys in obj, same as for (var key in obj) ..
Object.keys(obj).forEach(function (key) {
console.log( key , obj[key] );
});
This all are new features in ECMAScript , the mothods getOwnPropertyNames, keys won't supports old browser's.
How do I use MySQL through XAMPP?
XAMPP Apache + MariaDB + PHP + Perl (X -any OS)
- After successful installation execute xampp-control.exe in XAMPP folder
Start Apache and MySQL
Open browser and in url type
localhostor127.0.0.1- then you are welcomed with dashboard
By default your port is listing with 80.If you want you can change it to your desired port number in httpd.conf file.(If port 80 is already using with other app then you have to change it).
For example you changed port number 80 to 8090 then you can run as 'localhost:8090' or '127.0.0.1:8090'
Using PUT method in HTML form
Can I use "Put" method in html form to send data from HTML Form to server?
Yes you can, but keep in mind that it will not result in a PUT but a GET request. If you use an invalid value for the method attribute of the <form> tag, the browser will use the default value get.
HTML forms (up to HTML version 4 (, 5 Draft) and XHTML 1) only support GET and POST as HTTP request methods. A workaround for this is to tunnel other methods through POST by using a hidden form field which is read by the server and the request dispatched accordingly. XHTML 2.0 once planned to support GET, POST, PUT and DELETE for forms, but it's going into XHTML5 of HTML5, which does not plan to support PUT. [update to]
You can alternatively offer a form, but instead of submitting it, create and fire a XMLHttpRequest using the PUT method with JavaScript.
Socket.IO - how do I get a list of connected sockets/clients?
I believe you can access this from the socket's manager property?
var handshaken = io.manager.handshaken;
var connected = io.manager.connected;
var open = io.manager.open;
var closed = io.manager.closed;
Lining up labels with radio buttons in bootstrap
Key insights for me were: - ensure that label content comes after the input-radio field - I tweaked my css to make everything a little closer
.radio-inline+.radio-inline {
margin-left: 5px;
}
LINQ: Distinct values
// First Get DataTable as dt
// DataRowComparer Compare columns numbers in each row & data in each row
IEnumerable<DataRow> Distinct = dt.AsEnumerable().Distinct(DataRowComparer.Default);
foreach (DataRow row in Distinct)
{
Console.WriteLine("{0,-15} {1,-15}",
row.Field<int>(0),
row.Field<string>(1));
}
Splitting templated C++ classes into .hpp/.cpp files--is it possible?
No, it's not possible. Not without the export keyword, which for all intents and purposes doesn't really exist.
The best you can do is put your function implementations in a ".tcc" or ".tpp" file, and #include the .tcc file at the end of your .hpp file. However this is merely cosmetic; it's still the same as implementing everything in header files. This is simply the price you pay for using templates.
Error:Cause: unable to find valid certification path to requested target
Most of the times when I face this issue. I remove replace https with http. It solves the issue.
Is it possible only to declare a variable without assigning any value in Python?
I'd heartily recommend that you read Other languages have "variables" (I added it as a related link) – in two minutes you'll know that Python has "names", not "variables".
val = None
# ...
if val is None:
val = any_object
How to get the first element of the List or Set?
In Java >=8 you could also use the Streaming API:
Optional<String> first = set.stream().findFirst();
(Useful if the Set/List may be empty.)
How to get 2 digit year w/ Javascript?
var currentYear = (new Date()).getFullYear();
var twoLastDigits = currentYear%100;
var formatedTwoLastDigits = "";
if (twoLastDigits <10 ) {
formatedTwoLastDigits = "0" + twoLastDigits;
} else {
formatedTwoLastDigits = "" + twoLastDigits;
}
What's the best way to center your HTML email content in the browser window (or email client preview pane)?
For googlers and completeness sake:
Here's a reference I always use when I need to go through the pain of implementing html email-templates or signatures: http://www.campaignmonitor.com/css/
I'ts a list of CSS support for most, if not all, CSS options, nicely compared between some of the most used email clients.
For centering, feel free to just use CSS (as the align attribute is deprecated in HTML 4.01).
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="text-align: center;">
Your Content
</td>
</tr>
</table>
How to catch segmentation fault in Linux?
C++ solution found here (http://www.cplusplus.com/forum/unices/16430/)
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
void ouch(int sig)
{
printf("OUCH! - I got signal %d\n", sig);
}
int main()
{
struct sigaction act;
act.sa_handler = ouch;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGINT, &act, 0);
while(1) {
printf("Hello World!\n");
sleep(1);
}
}
is not JSON serializable
class CountryListView(ListView):
model = Country
def render_to_response(self, context, **response_kwargs):
return HttpResponse(json.dumps(list(self.get_queryset().values_list('code', flat=True))),mimetype="application/json")
fixed the problem
also mimetype is important.
Where does forever store console.log output?
if you run the command "forever logs", you can see where are the logs files.
HashSet vs. List performance
You can use a HybridDictionary which automaticly detects the breaking point, and accepts null-values, making it essentialy the same as a HashSet.
How to test an SQL Update statement before running it?
I know this is a repeat of other answers, but it has some emotional support to take the extra step for testing update :D
For testing update, hash # is your friend.
If you have an update statement like:
UPDATE
wp_history
SET history_by="admin"
WHERE
history_ip LIKE '123%'
You hash UPDATE and SET out for testing, then hash them back in:
SELECT * FROM
#UPDATE
wp_history
#SET history_by="admin"
WHERE
history_ip LIKE '123%'
It works for simple statements.
An additional practically mandatory solution is, to get a copy (backup duplicate), whenever using update on a production table. Phpmyadmin > operations > copy: table_yearmonthday. It just takes a few seconds for tables <=100M.
Can I use conditional statements with EJS templates (in JMVC)?
Just making code shorter you can use ES6 features. The same things can be written as
app.get("/recipes", (req, res) => {
res.render("recipes.ejs", {
recipes
});
});
And the Templeate can be render as the same!
<%if (recipes.length > 0) { %>
// Do something with more than 1 recipe
<% } %>
validate a dropdownlist in asp.net mvc
I just can't believe that there are people still using ViewData/ViewBag in ASP.NET MVC 3 instead of having strongly typed views and view models:
public class MyViewModel
{
[Required]
public string CategoryId { get; set; }
public IEnumerable<Category> Categories { get; set; }
}
and in your controller:
public class HomeController: Controller
{
public ActionResult Index()
{
var model = new MyViewModel
{
Categories = Repository.GetCategories()
}
return View(model);
}
[HttpPost]
public ActionResult Index(MyViewModel model)
{
if (!ModelState.IsValid)
{
// there was a validation error =>
// rebind categories and redisplay view
model.Categories = Repository.GetCategories();
return View(model);
}
// At this stage the model is OK => do something with the selected category
return RedirectToAction("Success");
}
}
and then in your strongly typed view:
@Html.DropDownListFor(
x => x.CategoryId,
new SelectList(Model.Categories, "ID", "CategoryName"),
"-- Please select a category --"
)
@Html.ValidationMessageFor(x => x.CategoryId)
Also if you want client side validation don't forget to reference the necessary scripts:
<script src="@Url.Content("~/Scripts/jquery.validate.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")" type="text/javascript"></script>
Character reading from file in Python
There are a few points to consider.
A \u2018 character may appear only as a fragment of representation of a unicode string in Python, e.g. if you write:
>>> text = u'‘'
>>> print repr(text)
u'\u2018'
Now if you simply want to print the unicode string prettily, just use unicode's encode method:
>>> text = u'I don\u2018t like this'
>>> print text.encode('utf-8')
I don‘t like this
To make sure that every line from any file would be read as unicode, you'd better use the codecs.open function instead of just open, which allows you to specify file's encoding:
>>> import codecs
>>> f1 = codecs.open(file1, "r", "utf-8")
>>> text = f1.read()
>>> print type(text)
<type 'unicode'>
>>> print text.encode('utf-8')
I don‘t like this
How can I get an int from stdio in C?
I'm not fully sure that this is what you're looking for, but if your question is how to read an integer using <stdio.h>, then the proper syntax is
int myInt;
scanf("%d", &myInt);
You'll need to do a lot of error-handling to ensure that this works correctly, of course, but this should be a good start. In particular, you'll need to handle the cases where
- The
stdinfile is closed or broken, so you get nothing at all. - The user enters something invalid.
To check for this, you can capture the return code from scanf like this:
int result = scanf("%d", &myInt);
If stdin encounters an error while reading, result will be EOF, and you can check for errors like this:
int myInt;
int result = scanf("%d", &myInt);
if (result == EOF) {
/* ... you're not going to get any input ... */
}
If, on the other hand, the user enters something invalid, like a garbage text string, then you need to read characters out of stdin until you consume all the offending input. You can do this as follows, using the fact that scanf returns 0 if nothing was read:
int myInt;
int result = scanf("%d", &myInt);
if (result == EOF) {
/* ... you're not going to get any input ... */
}
if (result == 0) {
while (fgetc(stdin) != '\n') // Read until a newline is found
;
}
Hope this helps!
EDIT: In response to the more detailed question, here's a more appropriate answer. :-)
The problem with this code is that when you write
printf("got the number: %d", scanf("%d", &x));
This is printing the return code from scanf, which is EOF on a stream error, 0 if nothing was read, and 1 otherwise. This means that, in particular, if you enter an integer, this will always print 1 because you're printing the status code from scanf, not the number you read.
To fix this, change this to
int x;
scanf("%d", &x);
/* ... error checking as above ... */
printf("got the number: %d", x);
Hope this helps!
How to create a multi line body in C# System.Net.Mail.MailMessage
Try this
IsBodyHtml = false,
BodyEncoding = Encoding.UTF8,
BodyTransferEncoding = System.Net.Mime.TransferEncoding.EightBit
If you wish to stick to using \r\n
I managed to get mine working after trying for one whole day!
How to format a duration in java? (e.g format H:MM:SS)
If you're using a version of Java prior to 8... you can use Joda Time and PeriodFormatter. If you've really got a duration (i.e. an elapsed amount of time, with no reference to a calendar system) then you should probably be using Duration for the most part - you can then call toPeriod (specifying whatever PeriodType you want to reflect whether 25 hours becomes 1 day and 1 hour or not, etc) to get a Period which you can format.
If you're using Java 8 or later: I'd normally suggest using java.time.Duration to represent the duration. You can then call getSeconds() or the like to obtain an integer for standard string formatting as per bobince's answer if you need to - although you should be careful of the situation where the duration is negative, as you probably want a single negative sign in the output string. So something like:
public static String formatDuration(Duration duration) {
long seconds = duration.getSeconds();
long absSeconds = Math.abs(seconds);
String positive = String.format(
"%d:%02d:%02d",
absSeconds / 3600,
(absSeconds % 3600) / 60,
absSeconds % 60);
return seconds < 0 ? "-" + positive : positive;
}
Formatting this way is reasonably simple, if annoyingly manual. For parsing it becomes a harder matter in general... You could still use Joda Time even with Java 8 if you want to, of course.
How to lock orientation of one view controller to portrait mode only in Swift
Here is a simple way that works for me with Swift 4.2 (iOS 12.2), put this in a UIViewController for which you want to disable shouldAutorotate:
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
return .portrait
}
The .portrait part tells it in which orientation(s) to remain, you can change this as you like. Choices are: .portrait, .all, .allButUpsideDown, .landscape, .landscapeLeft, .landscapeRight, .portraitUpsideDown.
Set default host and port for ng serve in config file
Angular CLI 6+
In the latest version of Angular, this is set in the angular.json config file. Example:
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"projects": {
"my-project": {
"architect": {
"serve": {
"options": {
"port": 4444
}
}
}
}
}
}
You can also use ng config to view/edit values:
ng config projects["my-project"].architect["serve"].options {port:4444}
Angular CLI <6
In previous versions, this was set in angular-cli.json underneath the defaults element:
{
"defaults": {
"serve": {
"port": 4444,
"host": "10.1.2.3"
}
}
}
How to add text at the end of each line in Vim?
There is in fact a way to do this using Visual block mode. Simply pressing $A in Visual block mode appends to the end of all lines in the selection. The appended text will appear on all lines as soon as you press Esc.
So this is a possible solution:
vip<C-V>$A,<Esc>
That is, in Normal mode, Visual select a paragraph vip, switch to Visual block mode CTRLV, append to all lines $A a comma ,, then press Esc to confirm.
The documentation is at :h v_b_A. There is even an illustration of how it works in the examples section: :h v_b_A_example.
Error "The connection to adb is down, and a severe error has occurred."
maydenec is correct (in my case...). The file was moved.
I even found this file:
C:\Program Files (x86)\Android\android-sdk\tools\adb_has_moved.txt
Which explained this issue.
Suggestions in this file:
- Install "Android SDK Platform-tools".
- Please also update your PATH environment variable to include the "platform-tools/" directory.
git diff between cloned and original remote repository
Another reply to your questions (assuming you are on master and already did "git fetch origin" to make you repo aware about remote changes):
1) Commits on remote branch since when local branch was created:
git diff HEAD...origin/master
2) I assume by "working copy" you mean your local branch with some local commits that are not yet on remote. To see the differences of what you have on your local branch but that does not exist on remote branch run:
git diff origin/master...HEAD
3) See the answer by dbyrne.
Instagram API - How can I retrieve the list of people a user is following on Instagram
You can use the following Instagram API Endpoint to get a list of people a user is following.
https://api.instagram.com/v1/users/{user-id}/follows?access_token=ACCESS-TOKEN
Here's the complete documentation for that endpoint. GET /users/user-id/follows
And here's a sample response from executing that endpoint.
Since this endpoint required a user-id (and not user-name), depending on how you've written your API client, you might have to make a call to the /users/search endpoint with a username, and then get the user-id from the response and pass it on to the above /users/user-id/follows endpoint to get the list of followers.
IANAL, but considering it's documented in their API, and looking at the terms of use, I don't see how this wouldn't be legal to do.
How to delete an SVN project from SVN repository
It's easy to believe that deleting the whole Subversion repository requires "informing" Subversion that you're going to delete the repository. But Subversion only cares about managing a repository once it's created, not whether the repository exists or not ( if that makes sense ). It goes like this: the Subversion tools and commands are not adversely affected by just deleting your repository directory with the regular operating system utilities (like rm -R). A repository directory is not the same thing as an installed program directory, where deleting a program without uninstalling it might leave behind erratic config files or other dependencies. A repository is 100% self-contained in its directory, and deleting it is harmless (besides losing your project history). You just clean the slate to create a new Subversion repository and import your next project.
How to exclude 0 from MIN formula Excel
All you have to do is to delete the "0" in the cells that contain just that and try again. That should work.
How do I add an existing directory tree to a project in Visual Studio?
You need to put your directory structure in your project directory. And then click "Show All Files" icon in the top of Solution Explorer toolbox. After that, the added directory will be shown up. You will then need to select this directory, right click, and choose "Include in Project."
Could not find server 'server name' in sys.servers. SQL Server 2014
I had the problem due to an extra space in the name of the linked server. "SERVER1, 1234" instead of "SERVER1,1234"
How to get span tag inside a div in jQuery and assign a text?
$("#message > span").text("your text");
or
$("#message").find("span").text("your text");
or
$("span","#message").text("your text");
or
$("#message > a.close-notify").siblings('span').text("your text");
How to call Oracle MD5 hash function?
In Oracle 12c you can use the function STANDARD_HASH. It does not require any additional privileges.
select standard_hash('foo', 'MD5') from dual;
The dbms_obfuscation_toolkit is deprecated (see Note here). You can use DBMS_CRYPTO directly:
select rawtohex(
DBMS_CRYPTO.Hash (
UTL_I18N.STRING_TO_RAW ('foo', 'AL32UTF8'),
2)
) from dual;
Output:
ACBD18DB4CC2F85CEDEF654FCCC4A4D8
Add a lower function call if needed. More on DBMS_CRYPTO.
Javascript - Append HTML to container element without innerHTML
To give an alternative (as using DocumentFragment does not seem to work): You can simulate it by iterating over the children of the newly generated node and only append those.
var e = document.createElement('div');
e.innerHTML = htmldata;
while(e.firstChild) {
element.appendChild(e.firstChild);
}
Get access to parent control from user control - C#
You can use Control.Parent to get the parent of the control or Control.FindForm to get the first parent Form the control is on. There is a difference between the two in terms of finding forms, so one may be more suitable to use than the other.:
The control's Parent property value might not be the same as the Form returned by FindForm method. For example, if a RadioButton control is contained within a GroupBox control, and the GroupBox is on a Form, the RadioButton control's Parent is the GroupBox and the GroupBox control's Parent is the Form.
Getting raw SQL query string from PDO prepared statements
/**
* Replaces any parameter placeholders in a query with the value of that
* parameter. Useful for debugging. Assumes anonymous parameters from
* $params are are in the same order as specified in $query
*
* @param string $query The sql query with parameter placeholders
* @param array $params The array of substitution parameters
* @return string The interpolated query
*/
public static function interpolateQuery($query, $params) {
$keys = array();
# build a regular expression for each parameter
foreach ($params as $key => $value) {
if (is_string($key)) {
$keys[] = '/:'.$key.'/';
} else {
$keys[] = '/[?]/';
}
}
$query = preg_replace($keys, $params, $query, 1, $count);
#trigger_error('replaced '.$count.' keys');
return $query;
}
How to use jQuery to select a dropdown option?
$('select>option:eq(3)').attr('selected', 'selected');
One caveat here is if you have javascript watching for select/option's change event you need to add .trigger('change') so the code become.
$('select>option:eq(3)').attr('selected', 'selected').trigger('change');
because only calling .attr('selected', 'selected') does not trigger the event
How to stop/cancel 'git log' command in terminal?
You can hit the key q (for quit) and it should take you to the prompt.
Please see this link.
Windows batch: formatted date into variable
Two more ways that do not depend on the time settings (both taken from How get data/time independent from localization). And both also get the day of the week and none of them requires admin permissions!:
MAKECAB - will work on EVERY Windows system (fast, but creates a small temporary file) (the foxidrive script):
@echo off pushd "%temp%" makecab /D RptFileName=~.rpt /D InfFileName=~.inf /f nul >nul for /f "tokens=3-7" %%a in ('find /i "makecab"^<~.rpt') do ( set "current-date=%%e-%%b-%%c" set "current-time=%%d" set "weekday=%%a" ) del ~.* popd echo %weekday% %current-date% %current-time% pauseROBOCOPY - it's not a native command for Windows XP and Windows Server 2003, but it can be downloaded from the Microsoft site. But it is built-in in everything from Windows Vista and above:
@echo off setlocal for /f "skip=8 tokens=2,3,4,5,6,7,8 delims=: " %%D in ('robocopy /l * \ \ /ns /nc /ndl /nfl /np /njh /XF * /XD *') do ( set "dow=%%D" set "month=%%E" set "day=%%F" set "HH=%%G" set "MM=%%H" set "SS=%%I" set "year=%%J" ) echo Day of the week: %dow% echo Day of the month : %day% echo Month : %month% echo hour : %HH% echo minutes : %MM% echo seconds : %SS% echo year : %year% endlocalAnd three more ways that uses other Windows script languages. They will give you more flexibility e.g. you can get week of the year, time in milliseconds and so on.
JScript/BATCH hybrid (need to be saved as
.bat). JScript is available on every system from Windows NT and above, as a part of Windows Script Host (though can be disabled through the registry it's a rare case):@if (@X)==(@Y) @end /* ---Harmless hybrid line that begins a JScript comment @echo off cscript //E:JScript //nologo "%~f0" exit /b 0 *------------------------------------------------------------------------------*/ function GetCurrentDate() { // Today date time which will used to set as default date. var todayDate = new Date(); todayDate = todayDate.getFullYear() + "-" + ("0" + (todayDate.getMonth() + 1)).slice(-2) + "-" + ("0" + todayDate.getDate()).slice(-2) + " " + ("0" + todayDate.getHours()).slice(-2) + ":" + ("0" + todayDate.getMinutes()).slice(-2); return todayDate; } WScript.Echo(GetCurrentDate());VBScript/BATCH hybrid (Is it possible to embed and execute VBScript within a batch file without using a temporary file?) same case as jscript , but hybridization is not so perfect:
:sub echo(str) :end sub echo off '>nul 2>&1|| copy /Y %windir%\System32\doskey.exe %windir%\System32\'.exe >nul '& echo current date: '& cscript /nologo /E:vbscript "%~f0" '& exit /b '0 = vbGeneralDate - Default. Returns date: mm/dd/yy and time if specified: hh:mm:ss PM/AM. '1 = vbLongDate - Returns date: weekday, monthname, year '2 = vbShortDate - Returns date: mm/dd/yy '3 = vbLongTime - Returns time: hh:mm:ss PM/AM '4 = vbShortTime - Return time: hh:mm WScript.echo Replace(FormatDateTime(Date, 1), ", ", "-")PowerShell - can be installed on every machine that has .NET - download from Microsoft (v1, v2, and v3 (only for Windows 7 and above)). Installed by default on everything form Windows 7/Win2008 and above:
C:\> powershell get-date -format "{dd-MMM-yyyy HH:mm}"Self-compiled jscript.net/batch (I have never seen a Windows machine without .NET so I think this is a pretty portable):
@if (@X)==(@Y) @end /****** silent line that start jscript comment ****** @echo off :::::::::::::::::::::::::::::::::::: ::: Compile the script :::: :::::::::::::::::::::::::::::::::::: setlocal if exist "%~n0.exe" goto :skip_compilation set "frm=%SystemRoot%\Microsoft.NET\Framework\" :: searching the latest installed .net framework for /f "tokens=* delims=" %%v in ('dir /b /s /a:d /o:-n "%SystemRoot%\Microsoft.NET\Framework\v*"') do ( if exist "%%v\jsc.exe" ( rem :: the javascript.net compiler set "jsc=%%~dpsnfxv\jsc.exe" goto :break_loop ) ) echo jsc.exe not found && exit /b 0 :break_loop call %jsc% /nologo /out:"%~n0.exe" "%~dpsfnx0" :::::::::::::::::::::::::::::::::::: ::: End of compilation :::: :::::::::::::::::::::::::::::::::::: :skip_compilation "%~n0.exe" exit /b 0 ****** End of JScript comment ******/ import System; import System.IO; var dt=DateTime.Now; Console.WriteLine(dt.ToString("yyyy-MM-dd hh:mm:ss"));Logman This cannot get the year and day of the week. It's comparatively slow, also creates a temp file and is based on the time stamps that logman puts on its log files.Will work everything from Windows XP and above. It probably will be never used by anybody - including me - but it is one more way...
@echo off setlocal del /q /f %temp%\timestampfile_* Logman.exe stop ts-CPU 1>nul 2>&1 Logman.exe delete ts-CPU 1>nul 2>&1 Logman.exe create counter ts-CPU -sc 2 -v mmddhhmm -max 250 -c "\Processor(_Total)\%% Processor Time" -o %temp%\timestampfile_ >nul Logman.exe start ts-CPU 1>nul 2>&1 Logman.exe stop ts-CPU >nul 2>&1 Logman.exe delete ts-CPU >nul 2>&1 for /f "tokens=2 delims=_." %%t in ('dir /b %temp%\timestampfile_*^&del /q/f %temp%\timestampfile_*') do set timestamp=%%t echo %timestamp% echo MM: %timestamp:~0,2% echo dd: %timestamp:~2,2% echo hh: %timestamp:~4,2% echo mm: %timestamp:~6,2% endlocal exit /b 0
More information about the Get-Date function.
Find elements inside forms and iframe using Java and Selenium WebDriver
By using https://github.com/nick318/FindElementInFrames You can find webElement across all frames:
SearchByFramesFactory searchFactory = new SearchByFramesFactory(driver);
SearchByFrames searchInFrame = searchFactory.search(() -> driver.findElement(By.tagName("body")));
Optional<WebElement> elem = searchInFrame.getElem();
Send HTTP GET request with header
You do it exactly as you showed with this line:
get.setHeader("Content-Type", "application/x-zip");
So your header is fine and the problem is some other input to the web service. You'll want to debug that on the server side.
CSS background image to fit height, width should auto-scale in proportion
I just had the same issue and this helped me:
html {
height: auto;
min-height: 100%;
background-size:cover;
}
Modifying list while iterating
I've been bitten before by (someone else's) "clever" code that tries to modify a list while iterating over it. I resolved that I would never do it under any circumstance.
You can use the slice operator mylist[::3] to skip across to every third item in your list.
mylist = [i for i in range(100)]
for i in mylist[::3]:
print(i)
Other points about my example relate to new syntax in python 3.0.
- I use a list comprehension to define mylist because it works in Python 3.0 (see below)
- print is a function in python 3.0
Python 3.0 range() now behaves like xrange() used to behave, except it works with values of arbitrary size. The latter no longer exists.
Using Default Arguments in a Function
I would propose changing the function declaration as follows so you can do what you want:
function foo($blah, $x = null, $y = null) {
if (null === $x) {
$x = "some value";
}
if (null === $y) {
$y = "some other value";
}
code here!
}
This way, you can make a call like foo('blah', null, 'non-default y value'); and have it work as you want, where the second parameter $x still gets its default value.
With this method, passing a null value means you want the default value for one parameter when you want to override the default value for a parameter that comes after it.
As stated in other answers,
default parameters only work as the last arguments to the function. If you want to declare the default values in the function definition, there is no way to omit one parameter and override one following it.
If I have a method that can accept varying numbers of parameters, and parameters of varying types, I often declare the function similar to the answer shown by Ryan P.
Here is another example (this doesn't answer your question, but is hopefully informative:
public function __construct($params = null)
{
if ($params instanceof SOMETHING) {
// single parameter, of object type SOMETHING
} elseif (is_string($params)) {
// single argument given as string
} elseif (is_array($params)) {
// params could be an array of properties like array('x' => 'x1', 'y' => 'y1')
} elseif (func_num_args() == 3) {
$args = func_get_args();
// 3 parameters passed
} elseif (func_num_args() == 5) {
$args = func_get_args();
// 5 parameters passed
} else {
throw new \InvalidArgumentException("Could not figure out parameters!");
}
}
Run chrome in fullscreen mode on Windows
Update 03-Oct-19
new script that displays 10second countdown then launches chrome/chromiumn in fullscreen kiosk mode.
more updates to chrome required script update to allow autoplaying video with audio. Note --overscroll-history-navigation=0 isn't working currently will need to disable this flag by going to chrome://flags/#overscroll-history-navigation in your browser and setting to disabled.
@echo off
echo Countdown to application launch...
timeout /t 10
"C:\Program Files (x86)\chrome-win32\chrome.exe" --chrome --kiosk http://localhost/xxxx --incognito --disable-pinch --no-user-gesture-required --overscroll-history-navigation=0
exit
might need to set chrome://flags/#autoplay-policy if running an older version of chrome (60 below)
Update 11-May-16
There have been many updates to chrome since I posted this and have had to alter the script alot to keep it working as I needed.
Couple of issues with newer versions of chrome:
- built in pinch to zoom
- Chrome restore error always showing after forced shutdown
- auto update popup
Because of the restore error switched out to incognito mode as this launches a clear version all the time and does not save what the user was viewing and so if it crashes there is nothing to restore. Also the auto up in newer versions of chrome being a pain to try and disable I switched out to use chromium as it does not auto update and still gives all the modern features of chrome. Note make sure you download the top version of chromium this comes with all audio and video codecs as the basic version of chromium does not support all codecs.
@echo off echo Step 1 of 2: Waiting a few seconds before starting the Kiosk... "C:\windows\system32\ping" -n 5 -w 1000 127.0.0.1 >NUL echo Step 2 of 5: Waiting a few more seconds before starting the browser... "C:\windows\system32\ping" -n 5 -w 1000 127.0.0.1 >NUL echo Final 'invisible' step: Starting the browser, Finally... "C:\Program Files (x86)\Google\Chromium\chrome.exe" --chrome --kiosk http://127.0.0.1/xxxx --incognito --disable-pinch --overscroll-history-navigation=0 exit
Outdated
I use this for exhibitions to lock down screens. I think its what your looking for.
- Start chrome and go to www.google.com drag and drop the url out onto the desktop
- rename it to something handy for this example google_homepage
- drop this now into your c directory, click on my computer c: and drop this file in there
- start chrome again go to settings and under on start up select open a specific page and set your home page here.
Next part is the script that I use to start close and restart chrome again in kiosk mode. The locations is where I have chrome installed so it might be abit different for you depending on your install.
Open your text editor of choice or just notepad and past the below code in, make sure its in the same format/order as below. Save it to your desktop as what ever you like so for this example chrome_startup_script.txt next right click it and rename, remove the txt from the end and put in bat instead. double click this to launch the script to see if its working correctly.
A command line box should appear and run through the script, chrome will start and then close down the reason to do this is to remove any error reports such as if the pc crashed, when chrome starts again without this it would show the yellow error bar at the top saying chrome did not shut down properly would you like to restore it. After a few seconds chrome should start again and in kiosk mode and will point to what ever homepage you have set.
@echo off
echo Step 1 of 5: Waiting a few seconds before starting the Kiosk...
"C:\windows\system32\ping" -n 31 -w 1000 127.0.0.1 >NUL
echo Step 2 of 5: Starting browser as a pre-start to delete error messages...
"C:\google_homepage.url"
echo Step 3 of 5: Waiting a few seconds before killing the browser task...
"C:\windows\system32\ping" -n 11 -w 1000 127.0.0.1 >NUL
echo Step 4 of 5: Killing the browser task gracefully to avoid session restore...
Taskkill /IM chrome.exe
echo Step 5 of 5: Waiting a few seconds before restarting the browser...
"C:\windows\system32\ping" -n 11 -w 1000 127.0.0.1 >NUL
echo Final 'invisible' step: Starting the browser, Finally...
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --kiosk --overscroll-history-navigation=0"
exit
Note: The number after the -n of the ping is the amount of seconds (minus one second) to wait before starting the link (or application in the next line)
Finally if this is all working then you can drag and drop the .bat file into the startup folder in windows and this script will launch each time windows starts.
Update:
With recent versions of chrome they have really got into enabling touch gestures, this means that swiping left or right on a touchscreen will cause the browser to go forward or backward in history. To prevent this we need to disable the history navigation on the back and forward buttons to do that add the following --overscroll-history-navigation=0 to the end of the script.
Docker: Container keeps on restarting again on again
I had forgot Minikube running in background and thats what always restarted them back up
HTML5 - mp4 video does not play in IE9
If any of these answers above don't work, and you're on an apache server, adding the following to your .htaccess file:
//most of the common formats, add any that apply
AddType video/mp4 .mp4
AddType audio/mp4 .m4a
AddType video/mp4 .m4v
AddType video/ogg .ogv
AddType video/ogg .ogg
AddType video/webm .webm
I had a similar problem and adding this solved all my playback issues.
entity framework Unable to load the specified metadata resource
Craig Stuntz has written an extensive (in my opinion) blog post on troubleshooting this exact error message, I personally would start there.
The following res: (resource) references need to point to your model.
<add name="Entities" connectionString="metadata=
res://*/Models.WraithNath.co.uk.csdl|
res://*/Models.WraithNath.co.uk.ssdl|
res://*/Models.WraithNath.co.uk.msl;
Make sure each one has the name of your .edmx file after the "*/", with the "edmx" changed to the extension for that res (.csdl, .ssdl, or .msl).
It also may help to specify the assembly rather than using "//*/".
Worst case, you can check everything (a bit slower but should always find the resource) by using
<add name="Entities" connectionString="metadata=
res://*/;provider= <!-- ... -->
PowerShell Connect to FTP server and get files
Remote pick directory path should be the exact path on the ftp server you are tryng to access.. here is the script to download files from the server.. you can add or modify with SSLMode..
#ftp server
$ftp = "ftp://example.com/"
$user = "XX"
$pass = "XXX"
$SetType = "bin"
$remotePickupDir = Get-ChildItem 'c:\test' -recurse
$webclient = New-Object System.Net.WebClient
$webclient.Credentials = New-Object System.Net.NetworkCredential($user,$pass)
foreach($item in $remotePickupDir){
$uri = New-Object System.Uri($ftp+$item.Name)
#$webclient.UploadFile($uri,$item.FullName)
$webclient.DownloadFile($uri,$item.FullName)
}
Python timedelta in years
this function returns the difference in years between two dates (taken as strings in ISO format, but it can easily modified to take in any format)
import time
def years(earlydateiso, laterdateiso):
"""difference in years between two dates in ISO format"""
ed = time.strptime(earlydateiso, "%Y-%m-%d")
ld = time.strptime(laterdateiso, "%Y-%m-%d")
#switch dates if needed
if ld < ed:
ld, ed = ed, ld
res = ld[0] - ed [0]
if res > 0:
if ld[1]< ed[1]:
res -= 1
elif ld[1] == ed[1]:
if ld[2]< ed[2]:
res -= 1
return res
Start/Stop and Restart Jenkins service on Windows
Open Console/Command line --> Go to your Jenkins installation directory. Execute the following commands respectively:
to stop:
jenkins.exe stop
to start:
jenkins.exe start
to restart:
jenkins.exe restart
How to get diff between all files inside 2 folders that are on the web?
Once you have the source trees, e.g.
diff -ENwbur repos1/ repos2/
Even better
diff -ENwbur repos1/ repos2/ | kompare -o -
and have a crack at it in a good gui tool :)
- -Ewb ignore the bulk of whitespace changes
- -N detect new files
- -u unified
- -r recurse
How to analyze a JMeter summary report?
The JMeter docs say the following:
The summary report creates a table row for each differently named request in your test. This is similar to the Aggregate Report , except that it uses less memory. The thoughput is calculated from the point of view of the sampler target (e.g. the remote server in the case of HTTP samples). JMeter takes into account the total time over which the requests have been generated. If other samplers and timers are in the same thread, these will increase the total time, and therefore reduce the throughput value. So two identical samplers with different names will have half the throughput of two samplers with the same name. It is important to choose the sampler labels correctly to get the best results from the Report.
- Label - The label of the sample. If "Include group name in label?" is selected, then the name of the thread group is added as a prefix. This allows identical labels from different thread groups to be collated separately if required.
- # Samples - The number of samples with the same label
- Average - The average elapsed time of a set of results
- Min - The lowest elapsed time for the samples with the same label
- Max - The longest elapsed time for the samples with the same label
- Std. Dev. - the Standard Deviation of the sample elapsed time
- Error % - Percent of requests with errors
- Throughput - the Throughput is measured in requests per second/minute/hour. The time unit is chosen so that the displayed rate is at least 1.0. When the throughput is saved to a CSV file, it is expressed in requests/second, i.e. 30.0 requests/minute is saved as 0.5.
- Kb/sec - The throughput measured in Kilobytes per second
- Avg. Bytes - average size of the sample response in bytes. (in JMeter 2.2 it wrongly showed the value in kB)
Times are in milliseconds.
How to 'grep' a continuous stream?
I think that your problem is that grep uses some output buffering. Try
tail -f file | stdbuf -o0 grep my_pattern
it will set output buffering mode of grep to unbuffered.
add maven repository to build.gradle
Add the maven repository outside the buildscript configuration block of your main build.gradle file as follows:
repositories {
maven {
url "https://github.com/jitsi/jitsi-maven-repository/raw/master/releases"
}
}
Make sure that you add them after the following:
apply plugin: 'com.android.application'
Drop Down Menu/Text Field in one
Option 1
Include the script from dhtmlgoodies and initialize like this:
<input type="text" name="myText" value="Norway"
selectBoxOptions="Canada;Denmark;Finland;Germany;Mexico">
createEditableSelect(document.forms[0].myText);
Option 2
Here's a custom solution which combines a <select> element and <input> element, styles them, and toggles back and forth via JavaScript
<div style="position:relative;width:200px;height:25px;border:0;padding:0;margin:0;">
<select style="position:absolute;top:0px;left:0px;width:200px; height:25px;line-height:20px;margin:0;padding:0;"
onchange="document.getElementById('displayValue').value=this.options[this.selectedIndex].text; document.getElementById('idValue').value=this.options[this.selectedIndex].value;">
<option></option>
<option value="one">one</option>
<option value="two">two</option>
<option value="three">three</option>
</select>
<input type="text" name="displayValue" id="displayValue"
placeholder="add/select a value" onfocus="this.select()"
style="position:absolute;top:0px;left:0px;width:183px;width:180px\9;#width:180px;height:23px; height:21px\9;#height:18px;border:1px solid #556;" >
<input name="idValue" id="idValue" type="hidden">
</div>
BarCode Image Generator in Java
ZXing is a free open source Java library to read and generate barcode images. You need to get the source code and build the jars yourself. Here's a simple tutorial that I wrote for building with ZXing jars and writing your first program with ZXing.
How to include Javascript file in Asp.Net page
Use Fiddler to see what is happening. Then change the path accordingly. You will probably find you get a 404 error and the path is wrong.
How to execute an action before close metro app WinJS
If I am not mistaken, it will be onunload event.
"Occurs when the application is about to be unloaded." - MSDN
How can I get a list of users from active directory?
Include the System.DirectoryServices.dll, then use the code below:
DirectoryEntry directoryEntry = new DirectoryEntry("WinNT://" + Environment.MachineName);
string userNames="Users: ";
foreach (DirectoryEntry child in directoryEntry.Children)
{
if (child.SchemaClassName == "User")
{
userNames += child.Name + Environment.NewLine ;
}
}
MessageBox.Show(userNames);
Proper way to make HTML nested list?
What's not mentioned here is that option 1 allows you arbitrarily deep nesting of lists.
This shouldn't matter if you control the content/css, but if you're making a rich text editor it comes in handy.
For example, gmail, inbox, and evernote all allow creating lists like this:
With option 2 you cannot due that (you'll have an extra list item), with option 1, you can.
The project description file (.project) for my project is missing
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>Lynxster</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
</buildSpec>
<natures>
</natures>
</projectDescription>
in the name tag give the name of the project folder and save this file with .project extension & paste it in the project folder.
this worked for me.
jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON
Striking a similar issue using CakePHP to output a JavaScript script-block using PHP's native json_encode. $contractorCompanies contains values that have single quotation marks and as explained above and expected json_encode($contractorCompanies) doesn't escape them because its valid JSON.
<?php $this->Html->scriptBlock("var contractorCompanies = jQuery.parseJSON( '".(json_encode($contractorCompanies)."' );"); ?>
By adding addslashes() around the JSON encoded string you then escape the quotation marks allowing Cake / PHP to echo the correct javascript to the browser. JS errors disappear.
<?php $this->Html->scriptBlock("var contractorCompanies = jQuery.parseJSON( '".addslashes(json_encode($contractorCompanies))."' );"); ?>
How to return history of validation loss in Keras
It's been solved.
The losses only save to the History over the epochs. I was running iterations instead of using the Keras built in epochs option.
so instead of doing 4 iterations I now have
model.fit(......, nb_epoch = 4)
Now it returns the loss for each epoch run:
print(hist.history)
{'loss': [1.4358016599558268, 1.399221191623641, 1.381293383180471, h1.3758836857303727]}
jQuery - Get Width of Element when Not Visible (Display: None)
function realWidth(obj){
var clone = obj.clone();
clone.css("visibility","hidden");
$('body').append(clone);
var width = clone.outerWidth();
clone.remove();
return width;
}
realWidth($("#parent").find("table:first"));
MySQL: How to copy rows, but change a few fields?
Hey how about to copy all fields, change one of them to the same value + something else.
INSERT INTO Table (foo, bar, Event_ID)
SELECT foo, bar, Event_ID+"155"
FROM Table
WHERE Event_ID = "120"
??????????
Git: How do I list only local branches?
One of the most straightforward ways to do it is
git for-each-ref --format='%(refname:short)' refs/heads/
This works perfectly for scripts as well.
Powershell: Get FQDN Hostname
(Get-ADComputer $(hostname)).DNSHostName
Eclipse Problems View not showing Errors anymore
I could reproduce this issue by creating an enumeration with a non-static member class and a static block enumerating its values:
public enum Foo {
Dummy(new Bar [] {new Bar()});
static {
for (Foo foo: Foo.values());
}
private Foo(Bar [] params) {}
public class Bar {}
}
This class breaks the Ganymede compiler. If you delete the line in the static initializer block, the code compiles correctly again, and you get the error that there is no enclosing instance for the new Bar() call, as expected.
-- correction: The above holds only if the project has gaeNature from Google Appengine. However, if you get an error similar as mentioned in the original question, you might be encountering another java compiler bug ...
What version of JBoss I am running?
In your JBoss lib Directory:
- Open the file jboss-system.jar by example
- Extract the file MANIFEST.MF from the META-INF directory
- Open MANIFEST.MF with a text editor and then look at the property Specification-Version and Implementation-Version
In LINQ, select all values of property X where X != null
// if you need to check if all items' MyProperty doesn't have null
if (list.All(x => x.MyProperty != null))
// do something
// or if you need to check if at least one items' property has doesn't have null
if (list.Any(x => x.MyProperty != null))
// do something
But you always have to check for null
Error when creating a new text file with python?
You can os.system function for simplicity :
import os
os.system("touch filename.extension")
This invokes system terminal to accomplish the task.
How to host google web fonts on my own server?
You can actually download all font format variants directly from Google and include them in your css to serve from your server. That way you don't have to concern about Google tracking your site's users. However, the downside maybe slowing down your own serving speed. Fonts are quite demanding on resources. I have not done any tests in this issue yet, and wonder if anyone has similar thoughts.
assembly to compare two numbers
It varies from assembler to assembler. Most machines offer registers, which have symbolic names like R1, or EAX (the Intel x86), and have instruction names like "CMP" for compare. And for a compare instruction, you need another operand, sometimes a register, sometimes a literal. Often assemblers allow comments to the right of instruction.
An instruction line looks like:
<opcode> <register> <operand> ; comment
Your assembler may vary somewhat.
For the Microsoft X86 assembler, you can write:
CMP EAX, 23 ; compare register EAX with the constant 23
or
CMP EAX, XYZ ; compare register EAX with contents of memory location named XYZ
Often one can write complex "expressions" in the operand field that enable the instruction, if it has the capability, to address memory in variety of ways. But I think this answers your question.
How can I use async/await at the top level?
Top-Level await has moved to stage 3, so the answer to your question How can I use async/await at the top level? is to just add await the call to main() :
async function main() {
var value = await Promise.resolve('Hey there');
console.log('inside: ' + value);
return value;
}
var text = await main();
console.log('outside: ' + text)
Or just:
const text = await Promise.resolve('Hey there');
console.log('outside: ' + text)
Compatibility
- v8 since Oct 2019
- the REPL in Chrome DevTools, Node.js and Safari web inspector
- Node v13.3+ behind the flag
--harmony-top-level-await - TypeScript 3.8+ (issue)
- Deno since Oct 2019
- [email protected]
php var_dump() vs print_r()
var_dump displays structured information about the object / variable. This includes type and values. Like print_r arrays are recursed through and indented.
print_r displays human readable information about the values with a format presenting keys and elements for arrays and objects.
The most important thing to notice is var_dump will output type as well as values while print_r does not.
Add leading zeroes/0's to existing Excel values to certain length
If you use custom formatting and need to concatenate those values elsewhere, you can copy them and Paste Special --> Values elsewhere in the sheet (or on a different sheet), then concatenate those values.
Select all 'tr' except the first one
Though the question has a decent answer already, I just want to stress that the :first-child tag goes on the item type that represents the children.
For example, in the code:
<div id"someDiv">
<input id="someInput1" />
<input id="someInput2" />
<input id="someInput2" />
</div
If you want to affect only the second two elements with a margin, but not the first, you would do:
#someDiv > input {
margin-top: 20px;
}
#someDiv > input:first-child{
margin-top: 0px;
}
that is, since the inputs are the children, you would place first-child on the input portion of the selector.
How to choose multiple files using File Upload Control?
aspx code
<asp:FileUpload ID="FileUpload1" runat="server" AllowMultiple="true" />
<asp:Button ID="btnUpload" Text="Upload" runat="server" OnClick ="UploadMultipleFiles" accept ="image/gif, image/jpeg" />
<hr />
<asp:Label ID="lblSuccess" runat="server" ForeColor ="Green" />
Code Behind:
protected void UploadMultipleFiles(object sender, EventArgs e)
{
foreach (HttpPostedFile postedFile in FileUpload1.PostedFiles)
{
string fileName = Path.GetFileName(postedFile.FileName);
postedFile.SaveAs(Server.MapPath("~/Uploads/") + fileName);
}
lblSuccess.Text = string.Format("{0} files have been uploaded successfully.", FileUpload1.PostedFiles.Count);
}
Is Java "pass-by-reference" or "pass-by-value"?
Java is always pass-by-value.
Unfortunately, we never handle an object at all, instead juggling object-handles called references (which are passed by value of course). The chosen terminology and semantics easily confuse many beginners.
It goes like this:
public static void main(String[] args) {
Dog aDog = new Dog("Max");
Dog oldDog = aDog;
// we pass the object to foo
foo(aDog);
// aDog variable is still pointing to the "Max" dog when foo(...) returns
aDog.getName().equals("Max"); // true
aDog.getName().equals("Fifi"); // false
aDog == oldDog; // true
}
public static void foo(Dog d) {
d.getName().equals("Max"); // true
// change d inside of foo() to point to a new Dog instance "Fifi"
d = new Dog("Fifi");
d.getName().equals("Fifi"); // true
}
In the example above aDog.getName() will still return "Max". The value aDog within main is not changed in the function foo with the Dog "Fifi" as the object reference is passed by value. If it were passed by reference, then the aDog.getName() in main would return "Fifi" after the call to foo.
Likewise:
public static void main(String[] args) {
Dog aDog = new Dog("Max");
Dog oldDog = aDog;
foo(aDog);
// when foo(...) returns, the name of the dog has been changed to "Fifi"
aDog.getName().equals("Fifi"); // true
// but it is still the same dog:
aDog == oldDog; // true
}
public static void foo(Dog d) {
d.getName().equals("Max"); // true
// this changes the name of d to be "Fifi"
d.setName("Fifi");
}
In the above example, Fifi is the dog's name after call to foo(aDog) because the object's name was set inside of foo(...). Any operations that foo performs on d are such that, for all practical purposes, they are performed on aDog, but it is not possible to change the value of the variable aDog itself.
Converting Columns into rows with their respective data in sql server
DECLARE @TABLE TABLE
(RowNo INT,ScripName VARCHAR(10),ScripCode VARCHAR(10)
,Price VARCHAR(10))
INSERT INTO @TABLE VALUES
(1,'20 MICRONS ','533022','39')
SELECT ColumnName,ColumnValue from @Table
Unpivot(ColumnValue For ColumnName IN (ScripName,ScripCode,Price)) AS H
Get the value in an input text box
Pure JS
txt_name.value
txt_name.onkeyup = e=> alert(txt_name.value);<input type="text" id="txt_name" />How do I use Apache tomcat 7 built in Host Manager gui?
I'm not sure about Tomcat 7, but with Tomcat 6... once you start Tomcat:
By going into the bin directory and starting startup.bat (win) or startup.sh (Unix/osx) it will spin up a local instance of the server running usually on port 8080 by default. Then by going to http://localhost:8080/ and seeing that it is running, there is a link to the manager. If that page is not there, you can try loading the manager by going directly to manager/html, and that will load the Host Manager gui.
http://localhost:8080/manager/html
Make sure Tomcat is running first and that 8080 is the right port. These are just the defaults that tomcat usually runs with.
To login you need to edit the conf/tomcat-users.xml, and create a Manager GUI role
<role rolename="manager-gui"/>
and add that to a user
<user username="admin" password="password" roles="manager-gui"/>
Then when you go to Manager GUI app at http://localhost:8080/manager/html it will prompt you for a username/password, which you added to that config file.
How do I split a string so I can access item x?
Here I post a simple way of solution
CREATE FUNCTION [dbo].[split](
@delimited NVARCHAR(MAX),
@delimiter NVARCHAR(100)
) RETURNS @t TABLE (id INT IDENTITY(1,1), val NVARCHAR(MAX))
AS
BEGIN
DECLARE @xml XML
SET @xml = N'<t>' + REPLACE(@delimited,@delimiter,'</t><t>') + '</t>'
INSERT INTO @t(val)
SELECT r.value('.','varchar(MAX)') as item
FROM @xml.nodes('/t') as records(r)
RETURN
END
Execute the function like this
select * from dbo.split('Hello John Smith',' ')
Refresh a page using PHP
Echo the meta tag like this:
URL is the one where the page should be redirected to after the refresh.
echo "<meta http-equiv=\"refresh\" content=\"0;URL=upload.php\">";
How to append in a json file in Python?
Assuming you have a test.json file with the following content:
{"67790": {"1": {"kwh": 319.4}}}
Then, the code below will load the json file, update the data inside using dict.update() and dump into the test.json file:
import json
a_dict = {'new_key': 'new_value'}
with open('test.json') as f:
data = json.load(f)
data.update(a_dict)
with open('test.json', 'w') as f:
json.dump(data, f)
Then, in test.json, you'll have:
{"new_key": "new_value", "67790": {"1": {"kwh": 319.4}}}
Hope this is what you wanted.
In php, is 0 treated as empty?
use only ($_POST['input_field_name'])!=0 instead of !($_POST['input_field_name'])==0 then 0 is not treated as empty.
Make a td fixed size (width,height) while rest of td's can expand
just set the width of the td/column you want to be fixed and the rest will expand.
<td width="200"></td>
Is generator.next() visible in Python 3?
g.next() has been renamed to g.__next__(). The reason for this is consistency: special methods like __init__() and __del__() all have double underscores (or "dunder" in the current vernacular), and .next() was one of the few exceptions to that rule. This was fixed in Python 3.0. [*]
But instead of calling g.__next__(), use next(g).
[*] There are other special attributes that have gotten this fix; func_name, is now __name__, etc.
Copy table from one database to another
SELECT ... INTO :
select * into <destination table> from <source table>
Everytime I run gulp anything, I get a assertion error. - Task function must be specified
You don't need to downgrade your gulp from gulp 4. Use gulp.series() to combine multiple tasks. At first install gulp globally with
npm install --global gulp-cli
and then install locally on your working directory with
npm install --save-dev gulp
Example:
package.json
{
"name": "gulp-test",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"browser-sync": "^2.26.3",
"gulp": "^4.0.0",
"gulp-sass": "^4.0.2"
},
"dependencies": {
"bootstrap": "^4.3.1",
"jquery": "^3.3.1",
"popper.js": "^1.14.7"
}
}
gulpfile.js
var gulp = require("gulp");
var sass = require('gulp-sass');
var browserSync = require('browser-sync').create();
// Specific Task
function js() {
return gulp
.src(['node_modules/bootstrap/dist/js/bootstrap.min.js', 'node_modules/jquery/dist/jquery.min.js', 'node_modules/popper.js/dist/umd/popper.min.js'])
.pipe(gulp.dest('src/js'))
.pipe(browserSync.stream());
}
gulp.task(js);
// Specific Task
function gulpSass() {
return gulp
.src(['src/scss/*.scss'])
.pipe(sass())
.pipe(gulp.dest('src/css'))
.pipe(browserSync.stream());
}
gulp.task(gulpSass);
// Run multiple tasks
gulp.task('start', gulp.series(js, gulpSass));
Run gulp start to fire multiple tasks & run gulp js or gulp gulpSass for specific task.
How to delete empty folders using windows command prompt?
Adding to corroded answer from the same referenced page is a PowerShell version http://blogs.msdn.com/b/oldnewthing/archive/2008/04/17/8399914.aspx#8408736
Get-ChildItem -Recurse . | where { $_.PSISContainer -and @( $_ | Get-ChildItem ).Count -eq 0 } | Remove-Item
or, more tersely,
gci -R . | where { $_.PSISContainer -and @( $_ | gci ).Count -eq 0 } | ri
credit goes to the posting author
How to grep for two words existing on the same line?
git grep
Here is the syntax using git grep combining multiple patterns using Boolean expressions:
git grep -e pattern1 --and -e pattern2 --and -e pattern3
The above command will print lines matching all the patterns at once.
If the files aren't under version control, add --no-index param.
Search files in the current directory that is not managed by Git.
Check man git-grep for help.
See also:
- How to use grep to match string1 AND string2?
- Check if all of multiple strings or regexes exist in a file.
- How to run grep with multiple AND patterns?
- For multiple patterns stored in the file, see: Match all patterns from file at once.
What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?
A ClassNotFoundException is thrown when the reported class is not found by the ClassLoader. This typically means that the class is missing from the CLASSPATH. It could also mean that the class in question is trying to be loaded from another class which was loaded in a parent classloader and hence the class from the child classloader is not visible. This is sometimes the case when working in more complex environments like an App Server (WebSphere is infamous for such classloader issues).
People often tend to confuse java.lang.NoClassDefFoundError with java.lang.ClassNotFoundException however there's an important distinction. For example an exception (an error really since java.lang.NoClassDefFoundError is a subclass of java.lang.Error) like
java.lang.NoClassDefFoundError:
org/apache/activemq/ActiveMQConnectionFactory
does not mean that the ActiveMQConnectionFactory class is not in the CLASSPATH. Infact its quite the opposite. It means that the class ActiveMQConnectionFactory was found by the ClassLoader however when trying to load the class, it ran into an error reading the class definition. This typically happens when the class in question has static blocks or members which use a Class that's not found by the ClassLoader. So to find the culprit, view the source of the class in question (ActiveMQConnectionFactory in this case) and look for code using static blocks or static members. If you don't have access the the source, then simply decompile it using JAD.
On examining the code, say you find a line of code like below, make sure that the class SomeClass in in your CLASSPATH.
private static SomeClass foo = new SomeClass();
Tip : To find out which jar a class belongs to, you can use the web site jarFinder . This allows you to specify a class name using wildcards and it searches for the class in its database of jars. jarhoo allows you to do the same thing but its no longer free to use.
If you would like to locate the which jar a class belongs to in a local path, you can use a utility like jarscan ( http://www.inetfeedback.com/jarscan/ ). You just specify the class you'd like to locate and the root directory path where you'd like it to start searching for the class in jars and zip files.
How to create .ipa file using Xcode?
Here is the steps I followed to export the .ipa
- Validate the archive
- Click on on distribute the app
- Click the distribution method
- Choose the export in the next screen (The screen shown only if the archive is validated)
Python, add items from txt file into a list
Names = []
for line in open('names.txt','r').readlines():
Names.append(line.strip())
strip() cut spaces in before and after string...
How to get HttpRequestMessage data
System.IO.StreamReader reader = new System.IO.StreamReader(HttpContext.Current.Request.InputStream);
reader.BaseStream.Position = 0;
string requestFromPost = reader.ReadToEnd();
The point of test %eax %eax
You are right, that test "and"s the two operands. But the result is discarded, the only thing that stays, and thats the important part, are the flags. They are set and thats the reason why the test instruction is used (and exist).
JE jumps not when equal (it has the meaning when the instruction before was a comparison), what it really does, it jumps when the ZF flag is set. And as it is one of the flags that is set by test, this instruction sequence (test x,x; je...) has the meaning that it is jumped when x is 0.
For questions like this (and for more details) I can just recommend a book about x86 instruction, e.g. even when it is really big, the Intel documentation is very good and precise.
PHP remove special character from string
Your dot is matching all characters. Escape it (and the other special characters), like this:
preg_replace('/[^a-zA-Z0-9_ %\[\]\.\(\)%&-]/s', '', $String);
CSV with comma or semicolon?
I'd say stick to comma as it's widely recognized and understood. Be sure to quote your values and escape your quotes though.
ID,NAME,AGE
"23434","Norris, Chuck","24"
"34343","Bond, James ""master""","57"
How do you loop through each line in a text file using a windows batch file?
@MrKraus's answer is instructive. Further, let me add that if you want to load a file located in the same directory as the batch file, prefix the file name with %~dp0. Here is an example:
cd /d %~dp0
for /F "tokens=*" %%A in (myfile.txt) do [process] %%A
NB:: If your file name or directory (e.g. myfile.txt in the above example) has a space (e.g. 'my file.txt' or 'c:\Program Files'), use:
for /F "tokens=*" %%A in ('type "my file.txt"') do [process] %%A
, with the type keyword calling the type program, which displays the contents of a text file. If you don't want to suffer the overhead of calling the type command you should change the directory to the text file's directory. Note that type is still required for file names with spaces.
I hope this helps someone!
How to force reloading php.ini file?
To force a reload of the php.ini you should restart apache.
Try sudo service apache2 restart from the command line.
Or sudo /etc/init.d/apache2 restart
Reporting Services permissions on SQL Server R2 SSRS
In my case after running IE as an administrator, i had to add the url of the report manager to the Local Internet Zones in Internet Explorer, not Trusted Sites.
How do I call one constructor from another in Java?
[Note: I just want to add one aspect, which I did not see in the other answers: how to overcome limitations of the requirement that this() has to be on the first line).]
In Java another constructor of the same class can be called from a constructor via this(). Note however that this has to be on the first line.
public class MyClass {
public MyClass(double argument1, double argument2) {
this(argument1, argument2, 0.0);
}
public MyClass(double argument1, double argument2, double argument3) {
this.argument1 = argument1;
this.argument2 = argument2;
this.argument3 = argument3;
}
}
That this has to appear on the first line looks like a big limitation, but you can construct the arguments of other constructors via static methods. For example:
public class MyClass {
public MyClass(double argument1, double argument2) {
this(argument1, argument2, getDefaultArg3(argument1, argument2));
}
public MyClass(double argument1, double argument2, double argument3) {
this.argument1 = argument1;
this.argument2 = argument2;
this.argument3 = argument3;
}
private static double getDefaultArg3(double argument1, double argument2) {
double argument3 = 0;
// Calculate argument3 here if you like.
return argument3;
}
}
jQuery call function after load
In regards to the question in your comment:
Assuming that you've previously bound your function to the click event of the radio button, add this to your $(document).ready function:
$('#[radioButtonOptionID]').click()
Without a parameter, that simulates the click event.
Limit text length to n lines using CSS
What you can do is the following:
.max-lines {_x000D_
display: block;/* or inline-block */_x000D_
text-overflow: ellipsis;_x000D_
word-wrap: break-word;_x000D_
overflow: hidden;_x000D_
max-height: 3.6em;_x000D_
line-height: 1.8em;_x000D_
}<p class="max-lines">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc vitae leo dapibus, accumsan lorem eleifend, pharetra quam. Quisque vestibulum commodo justo, eleifend mollis enim blandit eu. Aenean hendrerit nisl et elit maximus finibus. Suspendisse scelerisque consectetur nisl mollis scelerisque.</p>where max-height: = line-height: × <number-of-lines> in em.
What is the way of declaring an array in JavaScript?
The preferred way is to always use the literal syntax with square brackets; its behaviour is predictable for any number of items, unlike Array's. What's more, Array is not a keyword, and although it is not a realistic situation, someone could easily overwrite it:
function Array() { return []; }
alert(Array(1, 2, 3)); // An empty alert box
However, the larger issue is that of consistency. Someone refactoring code could come across this function:
function fetchValue(n) {
var arr = new Array(1, 2, 3);
return arr[n];
}
As it turns out, only fetchValue(0) is ever needed, so the programmer drops the other elements and breaks the code, because it now returns undefined:
var arr = new Array(1);
Write code to convert given number into words (eg 1234 as input should output one thousand two hundred and thirty four)
/*Maximum value that can be entered is 2,147,483,647
* Program to convert entered number into string
* */
import java.util.Scanner;
public class NumberToWords
{
public static void main(String[] args)
{
double num;//for taking input number
Scanner obj=new Scanner(System.in);
do
{
System.out.println("\n\nEnter the Number (Maximum value that can be entered is 2,147,483,647)");
num=obj.nextDouble();
if(num<=2147483647)//checking if entered number exceeds maximum integer value
{
int number=(int)num;//type casting double number to integer number
splitNumber(number);//calling splitNumber-it will split complete number in pairs of 3 digits
}
else
System.out.println("Enter smaller value");//asking user to enter a smaller value compared to 2,147,483,647
}while(num>2147483647);
}
//function to split complete number into pair of 3 digits each
public static void splitNumber(int number)
{ //splitNumber array-contains the numbers in pair of 3 digits
int splitNumber[]=new int[4],temp=number,i=0,index;
//splitting number into pair of 3
if(temp==0)
System.out.println("zero");
while(temp!=0)
{
splitNumber[i++]=temp%1000;
temp/=1000;
}
//passing each pair of 3 digits to another function
for(int j=i-1;j>-1;j--)
{ //toWords function will split pair of 3 digits to separate digits
if(splitNumber[j]!=0)
{toWords(splitNumber[j]);
if(j==3)//if the number contained more than 9 digits
System.out.print("billion,");
else if(j==2)//if the number contained more than 6 digits & less than 10 digits
System.out.print("million,");
else if(j==1)
System.out.print("thousand,");//if the number contained more than 3 digits & less than 7 digits
}
}
}
//function that splits number into individual digits
public static void toWords(int number)
//splitSmallNumber array contains individual digits of number passed to this function
{ int splitSmallNumber[]=new int[3],i=0,j;
int temp=number;//making temporary copy of the number
//logic to split number into its constituent digits
while(temp!=0)
{
splitSmallNumber[i++]=temp%10;
temp/=10;
}
//printing words for each digit
for(j=i-1;j>-1;j--)
//{ if the digit is greater than zero
if(splitSmallNumber[j]>=0)
//if the digit is at 3rd place or if digit is at (1st place with digit at 2nd place not equal to zero)
{ if(j==2||(j==0 && (splitSmallNumber[1]!=1)))
{
switch(splitSmallNumber[j])
{
case 1:System.out.print("one ");break;
case 2:System.out.print("two ");break;
case 3:System.out.print("three ");break;
case 4:System.out.print("four ");break;
case 5:System.out.print("five ");break;
case 6:System.out.print("six ");break;
case 7:System.out.print("seven ");break;
case 8:System.out.print("eight ");break;
case 9:System.out.print("nine ");break;
}
}
//if digit is at 2nd place
if(j==1)
{ //if digit at 2nd place is 0 or 1
if(((splitSmallNumber[j]==0)||(splitSmallNumber[j]==1))&& splitSmallNumber[2]!=0 )
System.out.print("hundred ");
switch(splitSmallNumber[1])
{ case 1://if digit at 2nd place is 1 example-213
switch(splitSmallNumber[0])
{
case 1:System.out.print("eleven ");break;
case 2:System.out.print("twelve ");break;
case 3:System.out.print("thirteen ");break;
case 4:System.out.print("fourteen ");break;
case 5:System.out.print("fifteen ");break;
case 6:System.out.print("sixteen ");break;
case 7:System.out.print("seventeen ");break;
case 8:System.out.print("eighteen ");break;
case 9:System.out.print("nineteen ");break;
case 0:System.out.print("ten ");break;
}break;
//if digit at 2nd place is not 1
case 2:System.out.print("twenty ");break;
case 3:System.out.print("thirty ");break;
case 4:System.out.print("forty ");break;
case 5:System.out.print("fifty ");break;
case 6:System.out.print("sixty ");break;
case 7:System.out.print("seventy ");break;
case 8:System.out.print("eighty ");break;
case 9:System.out.print("ninety ");break;
//case 0: System.out.println("hundred ");break;
}
}
}
}
}
Smooth scroll to specific div on click
What if u use scrollIntoView function?
var elmntToView = document.getElementById("sectionId");
elmntToView.scrollIntoView();
Has {behavior: "smooth"} too.... ;) https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView
What's the difference between a proxy server and a reverse proxy server?
My understanding from an Apache perspective is that proxy means that if site x proxies for site y, then requests for x return y.
The reverse proxy means that the response from y is adjusted so that all references to y become x.
So that the user cannot tell that a proxy is involved...
Pass parameters in setInterval function
Add them as parameters to setInterval:
setInterval(funca, 500, 10, 3);
The syntax in your question uses eval, which is not recommended practice.
How to set the current working directory?
Try os.chdir
os.chdir(path)Change the current working directory to path. Availability: Unix, Windows.
Is there a Max function in SQL Server that takes two values like Math.Max in .NET?
SELECT o.OrderId,
--MAX(o.NegotiatedPrice, o.SuggestedPrice)
(SELECT MAX(v) FROM (VALUES (o.NegotiatedPrice), (o.SuggestedPrice)) AS value(v)) as ChoosenPrice
FROM Order o
How to show the Project Explorer window in Eclipse
try window->Reset prespective. remember your own settings will be resetted if any.
How to get http headers in flask?
just note, The different between the methods are, if the header is not exist
request.headers.get('your-header-name')
will return None or no exception, so you can use it like
if request.headers.get('your-header-name'):
....
but the following will throw an error
if request.headers['your-header-name'] # KeyError: 'your-header-name'
....
You can handle it by
if 'your-header-name' in request.headers:
customHeader = request.headers['your-header-name']
....
Eclipse - Failed to create the java virtual machine
In my case reducing Xmx1024m to something smaller e.g Xmx512m make it works. So from all the responses (above and in similar other sites), it seems that you may try to massage/reduce the memory size.
JavaScript: Class.method vs. Class.prototype.method
A. Static Method:
Class.method = function () { /* code */ }
method()here is a function property added to an another function (here Class).- You can directly access the method() by the class / function name.
Class.method(); - No need for creating any object/instance (
new Class()) for accessing the method(). So you could call it as a static method.
B. Prototype Method (Shared across all the instances):
Class.prototype.method = function () { /* code using this.values */ }
method()here is a function property added to an another function protype (here Class.prototype).- You can either directly access by class name or by an object/instance (
new Class()). - Added advantage - this way of method() definition will create only one copy of method() in the memory and will be shared across all the object's/instance's created from the
Class
C. Class Method (Each instance has its own copy):
function Class () {
this.method = function () { /* do something with the private members */};
}
method()here is a method defined inside an another function (here Class).- You can't directly access the method() by the class / function name.
Class.method(); - You need to create an object/instance (
new Class()) for the method() access. - This way of method() definition will create a unique copy of the method() for each and every objects created using the constructor function (
new Class()). - Added advantage - Bcos of the method() scope it has the full right to access the local members(also called private members) declared inside the constructor function (here Class)
Example:
function Class() {
var str = "Constructor method"; // private variable
this.method = function () { console.log(str); };
}
Class.prototype.method = function() { console.log("Prototype method"); };
Class.method = function() { console.log("Static method"); };
new Class().method(); // Constructor method
// Bcos Constructor method() has more priority over the Prototype method()
// Bcos of the existence of the Constructor method(), the Prototype method
// will not be looked up. But you call it by explicity, if you want.
// Using instance
new Class().constructor.prototype.method(); // Prototype method
// Using class name
Class.prototype.method(); // Prototype method
// Access the static method by class name
Class.method(); // Static method
Logging request/response messages when using HttpClient
The easiest solution would be to use Wireshark and trace the HTTP tcp flow.
List all sequences in a Postgres db 8.1 with SQL
The relationship between automatically generated sequences ( such as those created for SERIAL columns ) and the parent table is modelled by the sequence owner attribute.
You can modify this relationship using the OWNED BY clause of the ALTER SEQUENCE commmand
e.g. ALTER SEQUENCE foo_id OWNED by foo_schema.foo_table
to set it to be linked to the table foo_table
or ALTER SEQUENCE foo_id OWNED by NONE
to break the connection between the sequence and any table
The information about this relationship is stored in the pg_depend catalogue table.
the joining relationship is the link between pg_depend.objid -> pg_class.oid WHERE relkind = 'S' - which links the sequence to the join record and then pg_depend.refobjid -> pg_class.oid WHERE relkind = 'r' , which links the join record to the owning relation ( table )
This query returns all the sequence -> table dependencies in a database. The where clause filters it to only include auto generated relationships, which restricts it to only display sequences created by SERIAL typed columns.
WITH fq_objects AS (SELECT c.oid,n.nspname || '.' ||c.relname AS fqname ,
c.relkind, c.relname AS relation
FROM pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace ),
sequences AS (SELECT oid,fqname FROM fq_objects WHERE relkind = 'S'),
tables AS (SELECT oid, fqname FROM fq_objects WHERE relkind = 'r' )
SELECT
s.fqname AS sequence,
'->' as depends,
t.fqname AS table
FROM
pg_depend d JOIN sequences s ON s.oid = d.objid
JOIN tables t ON t.oid = d.refobjid
WHERE
d.deptype = 'a' ;
Get PostGIS version
As the above people stated, select PostGIS_full_version(); will answer your question. On my machine, where I'm running PostGIS 2.0 from trunk, I get the following output:
postgres=# select PostGIS_full_version();
postgis_full_version
-------------------------------------------------------------------------------------------------------------------------------------------------------
POSTGIS="2.0.0alpha4SVN" GEOS="3.3.2-CAPI-1.7.2" PROJ="Rel. 4.7.1, 23 September 2009" GDAL="GDAL 1.8.1, released 2011/07/09" LIBXML="2.7.3" USE_STATS
(1 row)
You do need to care about the versions of PROJ and GEOS that are included if you didn't install an all-inclusive package - in particular, there's some brokenness in GEOS prior to 3.3.2 (as noted in the postgis 2.0 manual) in dealing with geometry validity.
Unlocking tables if thread is lost
Here's what i do to FORCE UNLOCK FOR some locked tables in MySQL
1) Enter MySQL
mysql -u your_user -p
2) Let's see the list of locked tables
mysql> show open tables where in_use>0;
3) Let's see the list of the current processes, one of them is locking your table(s)
mysql> show processlist;
4) Let's kill one of these processes
mysql> kill put_process_id_here;
How to convert a JSON string to a dictionary?
Swift 5
extension String {
func convertToDictionary() -> [String: Any]? {
if let data = data(using: .utf8) {
return try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
}
return nil
}
}
how to parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript or jQuery
See this http://blog.stevenlevithan.com/archives/date-time-format
you can do anything with date.
file : http://stevenlevithan.com/assets/misc/date.format.js
add this to your html code using script tag and to use you can use it as :
var now = new Date();
now.format("m/dd/yy");
// Returns, e.g., 6/09/07
How to debug a stored procedure in Toad?
Open a PL/SQL object in the Editor.
Click on the main toolbar or select Session | Toggle Compiling with Debug. This enables debugging.
Compile the object on the database.
Select one of the following options on the Execute toolbar to begin debugging: Execute PL/SQL with debugger () Step over Step into Run to cursor
How do you extract a JAR in a UNIX filesystem with a single command and specify its target directory using the JAR command?
Can't you just change working directory within the python script using os.chdir(target)? I agree, I can't see any way of doing it from the jar command itself.
If you don't want to permanently change directory, then store the current directory (using os.getcwd())in a variable and change back afterwards.
What's the difference between process.cwd() vs __dirname?
As per node js doc
process.cwd()
cwd is a method of global object process, returns a string value which is the current working directory of the Node.js process.
As per node js doc
__dirname
The directory name of current script as a string value. __dirname is not actually a global but rather local to each module.
Let me explain with example,
suppose we have a main.js file resides inside C:/Project/main.js
and running node main.js both these values return same file
or simply with following folder structure
Project
+-- main.js
+--lib
+-- script.js
main.js
console.log(process.cwd())
// C:\Project
console.log(__dirname)
// C:\Project
console.log(__dirname===process.cwd())
// true
suppose we have another file script.js files inside a sub directory of project ie C:/Project/lib/script.js and running node main.js which require script.js
main.js
require('./lib/script.js')
console.log(process.cwd())
// C:\Project
console.log(__dirname)
// C:\Project
console.log(__dirname===process.cwd())
// true
script.js
console.log(process.cwd())
// C:\Project
console.log(__dirname)
// C:\Project\lib
console.log(__dirname===process.cwd())
// false
What's the best way to determine which version of Oracle client I'm running?
You can get the version of the oracle client by running this command sqlplus /nolog on cmd. Another alternative will be to browse to the path C:\Program Files\Oracle\Inventory and open the "Inventory.xml" file which will give you the version as per below:
<?xml version="1.0" standalone="yes" ?>
<!-- Copyright (c) 1999, 2019, Oracle and/or its affiliates.
All rights reserved. -->
<!-- Do not modify the contents of this file by hand. -->
<INVENTORY>
<VERSION_INFO>
<SAVED_WITH>12.2.0.1.4</SAVED_WITH>
<MINIMUM_VER>2.1.0.6.0</MINIMUM_VER>
</VERSION_INFO>
How to get correlation of two vectors in python
The docs indicate that numpy.correlate is not what you are looking for:
numpy.correlate(a, v, mode='valid', old_behavior=False)[source]
Cross-correlation of two 1-dimensional sequences.
This function computes the correlation as generally defined in signal processing texts:
z[k] = sum_n a[n] * conj(v[n+k])
with a and v sequences being zero-padded where necessary and conj being the conjugate.
Instead, as the other comments suggested, you are looking for a Pearson correlation coefficient. To do this with scipy try:
from scipy.stats.stats import pearsonr
a = [1,4,6]
b = [1,2,3]
print pearsonr(a,b)
This gives
(0.99339926779878274, 0.073186395040328034)
You can also use numpy.corrcoef:
import numpy
print numpy.corrcoef(a,b)
This gives:
[[ 1. 0.99339927]
[ 0.99339927 1. ]]
WCF Service, the type provided as the service attribute values…could not be found
Faced this exact issue. The problem resolved when i changed the Service="Namespace.ServiceName" tag in the Markup (right click xxxx.svc and select View Markup in visual studio) to match the namespace i used for my xxxx.svc.cs file
C++ Object Instantiation
On the contrary, you should always prefer stack allocations, to the extent that as a rule of thumb, you should never have new/delete in your user code.
As you say, when the variable is declared on the stack, its destructor is automatically called when it goes out of scope, which is your main tool for tracking resource lifetime and avoiding leaks.
So in general, every time you need to allocate a resource, whether it's memory (by calling new), file handles, sockets or anything else, wrap it in a class where the constructor acquires the resource, and the destructor releases it. Then you can create an object of that type on the stack, and you're guaranteed that your resource gets freed when it goes out of scope. That way you don't have to track your new/delete pairs everywhere to ensure you avoid memory leaks.
The most common name for this idiom is RAII
Also look into smart pointer classes which are used to wrap the resulting pointers on the rare cases when you do have to allocate something with new outside a dedicated RAII object. You instead pass the pointer to a smart pointer, which then tracks its lifetime, for example by reference counting, and calls the destructor when the last reference goes out of scope. The standard library has std::unique_ptr for simple scope-based management, and std::shared_ptr which does reference counting to implement shared ownership.
Many tutorials demonstrate object instantiation using a snippet such as ...
So what you've discovered is that most tutorials suck. ;) Most tutorials teach you lousy C++ practices, including calling new/delete to create variables when it's not necessary, and giving you a hard time tracking lifetime of your allocations.
how to loop through each row of dataFrame in pyspark
above
tupleList = [{name:x["name"], age:x["age"], city:x["city"]}
should be
tupleList = [{'name':x["name"], 'age':x["age"], 'city':x["city"]}
for name, age, and city are not variables but simply keys of the dictionary.