The static
keyword in Java means that the variable or function is shared between all instances of that class as it belongs to the type, not the actual objects themselves.
So if you have a variable: private static int i = 0;
and you increment it (i++
) in one instance, the change will be reflected in all instances. i
will now be 1 in all instances.
Static methods can be used without instantiating an object.
See PEP 343 - The 'with' statement, there is an example section at the end.
... new statement "with" to the Python language to make it possible to factor out standard uses of try/finally statements.
interface in the Java programming language is an abstract type that is used to specify a behavior that classes must implement. They are similar to protocols. Interfaces are declared using the interface keyword
@interface is used to create your own (custom) Java annotations. Annotations are defined in their own file, just like a Java class or interface. Here is custom Java annotation example:
@interface MyAnnotation {
String value();
String name();
int age();
String[] newNames();
}
This example defines an annotation called MyAnnotation which has four elements. Notice the @interface keyword. This signals to the Java compiler that this is a Java annotation definition.
Notice that each element is defined similarly to a method definition in an interface. It has a data type and a name. You can use all primitive data types as element data types. You can also use arrays as data type. You cannot use complex objects as data type.
To use the above annotation, you could use code like this:
@MyAnnotation(
value="123",
name="Jakob",
age=37,
newNames={"Jenkov", "Peterson"}
)
public class MyClass {
}
Reference - http://tutorials.jenkov.com/java/annotations.html
Most answers here seem to miss the whole point. Polymorphism can be used not only between instances, but also between types. This is often needed, when we use generics.
Suppose we have type parameter in generic method and we need to do some operation with it. We dont want to instantinate, because we are unaware of the constructors.
For example:
Repository GetRepository<T>()
{
//need to call T.IsQueryable, but can't!!!
//need to call T.RowCount
//need to call T.DoSomeStaticMath(int param)
}
...
var r = GetRepository<Customer>()
Unfortunately, I can come up only with "ugly" alternatives:
Use reflection Ugly and beats the idea of interfaces and polymorphism.
Create completely separate factory class
This might greatly increase the complexity of the code. For example, if we are trying to model domain objects, each object would need another repository class.
Instantiate and then call the desired interface method
This can be hard to implement even if we control the source for the classes, used as generic parameters. The reason is that, for example we might need the instances to be only in well-known, "connected to DB" state.
Example:
public class Customer
{
//create new customer
public Customer(Transaction t) { ... }
//open existing customer
public Customer(Transaction t, int id) { ... }
void SomeOtherMethod()
{
//do work...
}
}
in order to use instantination for solving the static interface problem we need to do the following thing:
public class Customer: IDoSomeStaticMath
{
//create new customer
public Customer(Transaction t) { ... }
//open existing customer
public Customer(Transaction t, int id) { ... }
//dummy instance
public Customer() { IsDummy = true; }
int DoSomeStaticMath(int a) { }
void SomeOtherMethod()
{
if(!IsDummy)
{
//do work...
}
}
}
This is obviously ugly and also unnecessary complicates the code for all other methods. Obviously, not an elegant solution either!
JavaScript has no built-in general map type (sometimes called associative array or dictionary) which allows to access arbitrary values by arbitrary keys. JavaScript's fundamental data structure is the object, a special type of map which only accepts strings as keys and has special semantics like prototypical inheritance, getters and setters and some further voodoo.
When using objects as maps, you have to remember that the key will be converted to a string value via toString()
, which results in mapping 5
and '5'
to the same value and all objects which don't overwrite the toString()
method to the value indexed by '[object Object]'
. You might also involuntarily access its inherited properties if you don't check hasOwnProperty()
.
JavaScript's built-in array type does not help one bit: JavaScript arrays are not associative arrays, but just objects with a few more special properties. If you want to know why they can't be used as maps, look here.
Eugene Lazutkin already described the basic idea of using a custom hash function to generate unique strings which can be used to look up the associated values as properties of a dictionary object. This will most likely be the fastest solution, because objects are internally implemented as hash tables.
In order to get a unique hash value for arbitrary objects, one possibility is to use a global counter and cache the hash value in the object itself (for example, in a property named __hash
).
A hash function which does this is and works for both primitive values and objects is:
function hash(value) {
return (typeof value) + ' ' + (value instanceof Object ?
(value.__hash || (value.__hash = ++arguments.callee.current)) :
value.toString());
}
hash.current = 0;
This function can be used as described by Eugene. For convenience, we will further wrap it in a Map
class.
Map
implementationThe following implementation will additionally store the key-value-pairs in a doubly linked list in order to allow fast iteration over both keys and values. To supply your own hash function, you can overwrite the instance's hash()
method after creation.
// Linking the key-value-pairs is optional.
// If no argument is provided, linkItems === undefined, i.e. !== false
// --> linking will be enabled
function Map(linkItems) {
this.current = undefined;
this.size = 0;
if(linkItems === false)
this.disableLinking();
}
Map.noop = function() {
return this;
};
Map.illegal = function() {
throw new Error("illegal operation for maps without linking");
};
// Map initialisation from an existing object
// doesn't add inherited properties if not explicitly instructed to:
// omitting foreignKeys means foreignKeys === undefined, i.e. == false
// --> inherited properties won't be added
Map.from = function(obj, foreignKeys) {
var map = new Map;
for(var prop in obj) {
if(foreignKeys || obj.hasOwnProperty(prop))
map.put(prop, obj[prop]);
}
return map;
};
Map.prototype.disableLinking = function() {
this.link = Map.noop;
this.unlink = Map.noop;
this.disableLinking = Map.noop;
this.next = Map.illegal;
this.key = Map.illegal;
this.value = Map.illegal;
this.removeAll = Map.illegal;
return this;
};
// Overwrite in Map instance if necessary
Map.prototype.hash = function(value) {
return (typeof value) + ' ' + (value instanceof Object ?
(value.__hash || (value.__hash = ++arguments.callee.current)) :
value.toString());
};
Map.prototype.hash.current = 0;
// --- Mapping functions
Map.prototype.get = function(key) {
var item = this[this.hash(key)];
return item === undefined ? undefined : item.value;
};
Map.prototype.put = function(key, value) {
var hash = this.hash(key);
if(this[hash] === undefined) {
var item = { key : key, value : value };
this[hash] = item;
this.link(item);
++this.size;
}
else this[hash].value = value;
return this;
};
Map.prototype.remove = function(key) {
var hash = this.hash(key);
var item = this[hash];
if(item !== undefined) {
--this.size;
this.unlink(item);
delete this[hash];
}
return this;
};
// Only works if linked
Map.prototype.removeAll = function() {
while(this.size)
this.remove(this.key());
return this;
};
// --- Linked list helper functions
Map.prototype.link = function(item) {
if(this.size == 0) {
item.prev = item;
item.next = item;
this.current = item;
}
else {
item.prev = this.current.prev;
item.prev.next = item;
item.next = this.current;
this.current.prev = item;
}
};
Map.prototype.unlink = function(item) {
if(this.size == 0)
this.current = undefined;
else {
item.prev.next = item.next;
item.next.prev = item.prev;
if(item === this.current)
this.current = item.next;
}
};
// --- Iterator functions - only work if map is linked
Map.prototype.next = function() {
this.current = this.current.next;
};
Map.prototype.key = function() {
return this.current.key;
};
Map.prototype.value = function() {
return this.current.value;
};
The following script,
var map = new Map;
map.put('spam', 'eggs').
put('foo', 'bar').
put('foo', 'baz').
put({}, 'an object').
put({}, 'another object').
put(5, 'five').
put(5, 'five again').
put('5', 'another five');
for(var i = 0; i++ < map.size; map.next())
document.writeln(map.hash(map.key()) + ' : ' + map.value());
generates this output:
string spam : eggs
string foo : baz
object 1 : an object
object 2 : another object
number 5 : five again
string 5 : another five
PEZ suggested to overwrite the toString()
method, presumably with our hash function. This is not feasible, because it doesn't work for primitive values (changing toString()
for primitives is a very bad idea). If we want toString()
to return meaningful values for arbitrary objects, we would have to modify Object.prototype
, which some people (myself not included) consider verboten.
The current version of my Map
implementation as well as other JavaScript goodies can be obtained from here.
The purpose of interfaces is abstraction, or decoupling from implementation.
If you introduce an abstraction in your program, you don't care about the possible implementations. You are interested in what it can do and not how, and you use an interface
to express this in Java.
One reason lists work as they do (ordered) is to address the need for an ordered container that can contain any type at any node, which vectors do not do. Lists are re-used for a variety of purposes in R, including forming the base of a data.frame
, which is a list of vectors of arbitrary type (but the same length).
Why do these two expressions not return the same result?
x = list(1, 2, 3, 4); x2 = list(1:4)
To add to @Shane's answer, if you wanted to get the same result, try:
x3 = as.list(1:4)
Which coerces the vector 1:4
into a list.
After wrestling with this problem today my opinion is this: BEGIN...END brackets code just like {....} does in C languages, e.g. code blocks for if...else and loops
GO is (must be) used when succeeding statements rely on an object defined by a previous statement. USE database is a good example above, but the following will also bite you:
alter table foo add bar varchar(8);
-- if you don't put GO here then the following line will error as it doesn't know what bar is.
update foo set bar = 'bacon';
-- need a GO here to tell the interpreter to execute this statement, otherwise the Parser will lump it together with all successive statements.
It seems to me the problem is this: the SQL Server SQL Parser, unlike the Oracle one, is unable to realise that you're defining a new symbol on the first line and that it's ok to reference in the following lines. It doesn't "see" the symbol until it encounters a GO token which tells it to execute the preceding SQL since the last GO, at which point the symbol is applied to the database and becomes visible to the parser.
Why it doesn't just treat the semi-colon as a semantic break and apply statements individually I don't know and wish it would. Only bonus I can see is that you can put a print() statement just before the GO and if any of the statements fail the print won't execute. Lot of trouble for a minor gain though.
Yes you can use the ?GetValue???s
method:
var values = Enum.GetValues(typeof(Foos));
Or the typed version:
var values = Enum.GetValues(typeof(Foos)).Cast<Foos>();
I long ago added a helper function to my private library for just such an occasion:
public static class EnumUtil {
public static IEnumerable<T> GetValues<T>() {
return Enum.GetValues(typeof(T)).Cast<T>();
}
}
Usage:
var values = EnumUtil.GetValues<Foos>();
We encountered this issue when trying to add a UNIQUE index to a VARCHAR(255) field using utf8mb4. While the problem is outlined well here already, I wanted to add some practical advice for how we figured this out and solved it.
When using utf8mb4, characters count as 4 bytes, whereas under utf8, they could as 3 bytes. InnoDB databases have a limit that indexes can only contain 767 bytes. So when using utf8, you can store 255 characters (767/3 = 255), but using utf8mb4, you can only store 191 characters (767/4 = 191).
You're absolutely able to add regular indexes for VARCHAR(255)
fields using utf8mb4, but what happens is the index size is truncated at 191 characters automatically - like unique_key
here:
This is fine, because regular indexes are just used to help MySQL search through your data more quickly. The whole field doesn't need to be indexed.
So, why does MySQL truncate the index automatically for regular indexes, but throw an explicit error when trying to do it for unique indexes? Well, for MySQL to be able to figure out if the value being inserted or updated already exists, it needs to actually index the whole value and not just part of it.
At the end of the day, if you want to have a unique index on a field, the entire contents of the field must fit into the index. For utf8mb4, this means reducing your VARCHAR field lengths to 191 characters or less. If you don't need utf8mb4 for that table or field, you can drop it back to utf8 and be able to keep your 255 length fields.
I will answer this with a general answer. Usually these answers not working with guids. Here is a working version with guids too.
var stringVal="6e3ba183-89d9-e611-80c2-00155dcfb231"; // guid value as string to set
var prop = obj.GetType().GetProperty("FooGuidProperty"); // property to be setted
var propType = prop.PropertyType;
// var will be type of guid here
var valWithRealType = TypeDescriptor.GetConverter(propType).ConvertFrom(stringVal);
Based on the solution presented by @Layton Everson I developed a counter including hours, minutes and seconds:
var initialSecs = 86400;
var currentSecs = initialSecs;
setTimeout(decrement,1000);
function decrement() {
var displayedSecs = currentSecs % 60;
var displayedMin = Math.floor(currentSecs / 60) % 60;
var displayedHrs = Math.floor(currentSecs / 60 /60);
if(displayedMin <= 9) displayedMin = "0" + displayedMin;
if(displayedSecs <= 9) displayedSecs = "0" + displayedSecs;
currentSecs--;
document.getElementById("timerText").innerHTML = displayedHrs + ":" + displayedMin + ":" + displayedSecs;
if(currentSecs !== -1) setTimeout(decrement,1000);
}
angular.module('testAppControllers', [])
.controller('ctrlOne', function ($scope) {
$scope.$broadcast('test');
})
.controller('ctrlTwo', function ($scope) {
$scope.$on('test', function() {
});
});
When you want to read a file with a different configuration than the default one, feel free to use either mpu.aws.s3_read(s3path)
directly or the copy-pasted code:
def s3_read(source, profile_name=None):
"""
Read a file from an S3 source.
Parameters
----------
source : str
Path starting with s3://, e.g. 's3://bucket-name/key/foo.bar'
profile_name : str, optional
AWS profile
Returns
-------
content : bytes
botocore.exceptions.NoCredentialsError
Botocore is not able to find your credentials. Either specify
profile_name or add the environment variables AWS_ACCESS_KEY_ID,
AWS_SECRET_ACCESS_KEY and AWS_SESSION_TOKEN.
See https://boto3.readthedocs.io/en/latest/guide/configuration.html
"""
session = boto3.Session(profile_name=profile_name)
s3 = session.client('s3')
bucket_name, key = mpu.aws._s3_path_split(source)
s3_object = s3.get_object(Bucket=bucket_name, Key=key)
body = s3_object['Body']
return body.read()
EDIT: added a new example for ggplot2 at the end
See ?plotmath for the different mathematical operations in R
You should be able to use expression without paste. If you use the tilda (~) symbol within the expression function it will assume there is a space between the characters, or you could use the * symbol and it won't put a space between the arguments
Sometimes you will need to change the margins in you're putting superscripts on the y-axis.
par(mar=c(5, 4.3, 4, 2) + 0.1)
plot(1:10, xlab = expression(xLab ~ x^2 ~ m^-2),
ylab = expression(yLab ~ y^2 ~ m^-2),
main="Plot 1")
plot(1:10, xlab = expression(xLab * x^2 * m^-2),
ylab = expression(yLab * y^2 * m^-2),
main="Plot 2")
plot(1:10, xlab = expression(xLab ~ x^2 * m^-2),
ylab = expression(yLab ~ y^2 * m^-2),
main="Plot 3")
Hopefully you can see the differences between plots 1, 2 and 3 with the different uses of the ~ and * symbols. An extra note, you can use other symbols such as plotting the degree symbol for temperatures for or mu, phi. If you want to add a subscript use the square brackets.
plot(1:10, xlab = expression('Your x label' ~ mu[3] * phi),
ylab = expression("Temperature (" * degree * C *")"))
Here is a ggplot example using expression with a nonsense example
require(ggplot2)
Or if you have the pacman library installed you can use p_load to automatically download and load and attach add-on packages
# require(pacman)
# p_load(ggplot2)
data = data.frame(x = 1:10, y = 1:10)
ggplot(data, aes(x,y)) + geom_point() +
xlab(expression(bar(yourUnits) ~ g ~ m^-2 ~ OR ~ integral(f(x)*dx, a,b))) +
ylab(expression("Biomass (g per" ~ m^3 *")")) + theme_bw()
Short trick: after I only REMOVED SPACES from names of the folders, where the .jar file was, double-clicked worked and the file executed.
Note: This solution only works if your GridView
columns are known ahead of time.
It sounds like you're using a GridView
with AutoGenerateColumns=true
, which is the default. I recommend setting AutoGenerateColumns=false
and adding the columns manually:
<asp:GridView runat="server" ID="MyGridView"
AutoGenerateColumns="false" DataSourceID="MySqlDataSource">
<Columns>
<asp:BoundField DataField="Column1" />
<asp:BoundField DataField="Column2" />
<asp:BoundField DataField="Column3" />
</Columns>
</asp:GridView>
And only include a BoundField
for each field that you want to be displayed. This will give you the most flexibility in terms of how the data gets displayed.
Check if this solves the problem:
<div class="container-fluid no-padding">
<div class="row">
<div class="col-md-12">
<img src="https://placeholdit.imgix.net/~text?txtsize=33&txt=1300%C3%97400&w=1300&h=400" alt="placeholder 960" class="img-responsive" />
</div>
</div>
</div>
CSS
.no-padding {
padding-left: 0;
padding-right: 0;
}
Css class no-padding
will override default bootstrap container padding.
Full example here.
@Update If you use bootstrap 4 it could be done even simpler
<div class="container-fluid px-0">
<div class="row">
<div class="col-md-12">
<img src="https://placeholdit.imgix.net/~text?txtsize=33&txt=1300%C3%97400&w=1300&h=400" alt="placeholder 960" class="img-responsive" />
</div>
</div>
</div>
Updated example here.
Here is the example:
document.getElementsByTagName("html").foo="bar"
Here is another example how to set custom attributes into body tag element:
document.getElementsByTagName('body')[0].dataset.attr1 = "foo";
document.getElementsByTagName('body')[0].dataset.attr2 = "bar";
Then read the attribute by:
attr1 = document.getElementsByTagName('body')[0].dataset.attr1
attr2 = document.getElementsByTagName('body')[0].dataset.attr2
You can test above code in Console in DevTools, e.g.
Assuming you mean the HTML type RGB codes (called Hex codes, such as #FFCC66), use the ColorTranslator class:
System.Drawing.Color col = System.Drawing.ColorTranslator.FromHtml("#FFCC66");
If, however you are using an ARGB hex code, you can use the ColorConverter class from the System.Windows.Media namespace:
Color col = ColorConverter.ConvertFromString("#FFDFD991") as Color;
//or = (Color) ColorConverter.ConvertFromString("#FFCC66") ;
There are many ways to do this. To fix your current code using %
-formatting, you need to pass in a tuple:
Pass it as a tuple:
print("Total score for %s is %s" % (name, score))
A tuple with a single element looks like ('this',)
.
Here are some other common ways of doing it:
Pass it as a dictionary:
print("Total score for %(n)s is %(s)s" % {'n': name, 's': score})
There's also new-style string formatting, which might be a little easier to read:
Use new-style string formatting:
print("Total score for {} is {}".format(name, score))
Use new-style string formatting with numbers (useful for reordering or printing the same one multiple times):
print("Total score for {0} is {1}".format(name, score))
Use new-style string formatting with explicit names:
print("Total score for {n} is {s}".format(n=name, s=score))
Concatenate strings:
print("Total score for " + str(name) + " is " + str(score))
The clearest two, in my opinion:
Just pass the values as parameters:
print("Total score for", name, "is", score)
If you don't want spaces to be inserted automatically by print
in the above example, change the sep
parameter:
print("Total score for ", name, " is ", score, sep='')
If you're using Python 2, won't be able to use the last two because print
isn't a function in Python 2. You can, however, import this behavior from __future__
:
from __future__ import print_function
Use the new f
-string formatting in Python 3.6:
print(f'Total score for {name} is {score}')
I used to declare the configuration in application.properties
like this (you can use you own property file)
server.host = localhost
server.port = 8081
and in application you can get it easily by @Value("${server.host}")
and @Value("${server.port}")
as field level annotation.
or if in your case it is dynamic than you can get from system properties
Here is the example
@Value("#{systemproperties['server.host']}")
@Value("#{systemproperties['server.port']}")
For a better understanding of this annotation , see this example Multiple uses of @Value annotation
Try following these steps:
Add the integratedSecurity=true
to JDBC URL like this:
Url: jdbc:sqlserver://<<Server>>:<<Port>>;databasename=<<DatabaseName>>;integratedsecurity=true
Make sure to add the sqljdbc driver 4 or above version (sqljdbc.jar) in your project build path:
java.sql.DatabaseMetaData metaData = connection.getMetaData();
System.out.println("Driver version:" + metaData.getDriverVersion());
Add the VM argument for your project:
Find the sqljdbc_auth.dll file from DB installed server (C:\Program Files\sqljdbc_4.0\enu\auth\x86)
, or download from this link.
Place the dll file in your project folder and specify the VM argument like this:
VM Argument: -Djava.library.path="<<DLL File path till folder>>"
NOTE: Check your java version 32/64 bit then add 32/64 bit version dll file accordingly.
Yes, you can find out element by data attribute.
element = $('a[data-item-id="stand-out"]');
The correct way to 'solve' it is to close the connection and forget about the client. The client has closed the connection while you where still writing to it, so he doesn't want to know you, so that's it, isn't it?
For situations where there are multiple services in the same building you could offset the markers just a little, (say by .001 degree), in a radius from the actual point. This should also produce a nice visual effect.
urllib
has been split up in Python 3
.
The urllib.urlencode()
function is now urllib.parse.urlencode()
,
the urllib.urlopen()
function is now urllib.request.urlopen()
.
Take care with some of the examples; $0 may include some leading path as well as the name of the program. Eg save this two line script as ./mytry.sh and the execute it.
#!/bin/bash
echo "parameter 0 --> $0" ; exit 0
Output:
parameter 0 --> ./mytry.sh
This is on a current (year 2016) version of Bash, via Slackware 14.2
I solved the same problem in a React Native project. I solved it using this.
let data = snapshot.val();
if(data){
let items = Object.values(data);
}
else{
//return null
}
The following example shows benchmarks for a few alternatives.
library(rbenchmark) # Note spelling: "rbenchmark", not "benchmark"
benchmark(seq(0,1e6,by=2),(0:5e5)*2,seq.int(0L,1e6L,by=2L))
## test replications elapsed relative user.self sys.self
## 2 (0:5e+05) * 2 100 0.587 3.536145 0.344 0.244
## 1 seq(0, 1e6, by = 2) 100 2.760 16.626506 1.832 0.900
## 3 seq.int(0, 1e6, by = 2) 100 0.166 1.000000 0.056 0.096
In this case, seq.int
is the fastest method and seq
the slowest. If performance of this step isn't that important (it still takes < 3 seconds to generate a sequence of 500,000 values), I might still use seq
as the most readable solution.
What about this simple snippet, based on a standard script command (echo):
# set mac osx's terminal title to "My Title"
echo -n -e "\033]0;My Title\007"
I would suggest that the current solution is to use my package urllib2_prior_auth which solves this pretty nicely (I work on inclusion to the standard lib.
Building on Aravind's answer to fix the problem pointed out by ceklock in his comment, I added a method to verify that the dateString
doesn't contain any invalid character.
Here is how I do:
private boolean isDateCorrect(String dateString) {
try {
Date date = mDateFormatter.parse(dateString);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return matchesOurDatePattern(dateString); //added my method
}
catch (ParseException e) {
return false;
}
}
/**
* This will check if the provided string matches our date format
* @param dateString
* @return true if the passed string matches format 2014-1-15 (YYYY-MM-dd)
*/
private boolean matchesDatePattern(String dateString) {
return dateString.matches("^\\d+\\-\\d+\\-\\d+");
}
Your result is currently in string format, you need to parse it as json.
var obj = $.parseJSON(result);
alert(obj[0].category);
Additionally, if you set the dataType of the ajax call you are making to json
, you can skip the $.parseJSON()
step.
type
?Generic Transformations
Use the type
when you are transforming multiple types into a single generic type.
Example:
type Nullable<T> = T | null | undefined
type NonNull<T> = T extends (null | undefined) ? never : T
Type Aliasing
We can use the type
for creating the aliases for long or complicated types that are hard to read as well as inconvenient to type again and again.
Example:
type Primitive = number | string | boolean | null | undefined
Creating an alias like this makes the code more concise and readable.
Type Capturing
Use the type
to capture the type of an object when the type is unknown.
Example:
const orange = { color: "Orange", vitamin: "C"}
type Fruit = typeof orange
let apple: Fruit
Here, we get the unknown type of orange
, call it a Fruit
and then use the Fruit
to create a new type-safe object apple
.
interface
?Polymorphism
An interface
is a contract to implement a shape of the data. Use the interface to make it clear that it is intended to be implemented and used as a contract about how the object will be used.
Example:
interface Bird {
size: number
fly(): void
sleep(): void
}
class Hummingbird implements Bird { ... }
class Bellbird implements Bird { ... }
Though you can use the type
to achieve this, the Typescript is seen more as an object oriented language and the interface
has a special place in object oriented languages. It's easier to read the code with interface
when you are working in a team environment or contributing to the open source community. It's easy on the new programmers coming from the other object oriented languages too.
The official Typescript documentation also says:
... we recommend using an
interface
over atype
alias when possible.
This also suggests that the type
is more intended for creating type aliases than creating the types themselves.
Declaration Merging
You can use the declaration merging feature of the interface
for adding new properties and methods to an already declared interface
. This is useful for the ambient type declarations of third party libraries. When some declarations are missing for a third party library, you can declare the interface again with the same name and add new properties and methods.
Example:
We can extend the above Bird
interface to include new declarations.
interface Bird {
color: string
eat(): void
}
That's it! It's easier to remember when to use what than getting lost in subtle differences between the two.
Follow these steps :
Note: SOAPUI will remove all relative paths and will save all XSDs to the same folder. Refer the screenshot :
Tnx @Raj_89 , Your trick was very good , can be better , only by use extra style , that make it on other dom objects , exactly like a common select option tag in html ...
select{
position:absolute;
}
u can see result here : http://jsfiddle.net/aTzc2/
This can be done with a single statement and some XML magic:
select table_name,
to_number(extractvalue(xmltype(dbms_xmlgen.getxml('select count(*) c from '||owner||'.'||table_name)),'/ROWSET/ROW/C')) as count
from all_tables
where owner = 'FOOBAR'
According to PHPMailer Manual, full answer would be :
$mail->AddEmbeddedImage(filename, cid, name);
//Example
$mail->AddEmbeddedImage('my-photo.jpg', 'my-photo', 'my-photo.jpg ');
Use Case :
$mail->AddEmbeddedImage("rocks.png", "my-attach", "rocks.png");
$mail->Body = 'Embedded Image: <img alt="PHPMailer" src="cid:my-attach"> Here is an image!';
If you want to display an image with a remote URL :
$mail->addStringAttachment(file_get_contents("url"), "filename");
Convert the number to a string and throw away everything after the decimal.
trunc = function(n) { return Number(String(n).replace(/\..*/, "")) }
trunc(-1.5) === -1
trunc(1.5) === 1
Edit 2013-07-10
As pointed out by minitech and on second thought the string method does seem a bit excessive. So comparing the various methods listed here and elsewhere:
function trunc1(n){ return parseInt(n, 10); }
function trunc2(n){ return n - n % 1; }
function trunc3(n) { return Math[n > 0 ? "floor" : "ceil"](n); }
function trunc4(n) { return Number(String(n).replace(/\..*/, "")); }
function getRandomNumber() { return Math.random() * 10; }
function test(func, desc) {
var t1, t2;
var ave = 0;
for (var k = 0; k < 10; k++) {
t1 = new Date().getTime();
for (var i = 0; i < 1000000; i++) {
window[func](getRandomNumber());
}
t2 = new Date().getTime();
ave += t2 - t1;
}
console.info(desc + " => " + (ave / 10));
}
test("trunc1", "parseInt");
test("trunc2", "mod");
test("trunc3", "Math");
test("trunc4", "String");
The results, which may vary based on the hardware, are as follows:
parseInt => 258.7
mod => 246.2
Math => 243.8
String => 1373.1
The Math.floor / ceil method being marginally faster than parseInt and mod. String does perform poorly compared to the other methods.
In my case, there is 14 input edit text in the list view. The problem I was facing, when the keyboard open, edit text focus lost, scroll the layout, and as soon as focused view not visible to the user keyboard down. It was not good for the user experience. I can't use windowSoftInputMethod="adjustPan". So after so much searching, I found a link that inflates custom layout and sets data on view as an adapter by using LinearLayout and scrollView and work well for my case.
User can use this
Dim todaysdate As String = String.Format("{0:dd/MM/yyyy}", DateTime.Now)
this will format the date as required whereas user can change the string type dd/MM/yyyy or MM/dd/yyyy or yyyy/MM/dd or even can have this format to get the time from date
yyyy/MM/dd HH:mm:ss
There is du
command.
Size of a directory and/or file, in a human-friendly way:
$ du -sh .bashrc /tmp
I memorised it as a non-existent English word dush.
--apparent-size
command line switch makes it measure apparent sizes (what ls
shows) rather than actual disk usage.
Essentially, the only thing in Python that introduces a new scope is a function definition. Classes are a bit of a special case in that anything defined directly in the body is placed in the class's namespace, but they are not directly accessible from within the methods (or nested classes) they contain.
In your example there are only 3 scopes where x will be searched in:
spam's scope - containing everything defined in code3 and code5 (as well as code4, your loop variable)
The global scope - containing everything defined in code1, as well as Foo (and whatever changes after it)
The builtins namespace. A bit of a special case - this contains the various Python builtin functions and types such as len() and str(). Generally this shouldn't be modified by any user code, so expect it to contain the standard functions and nothing else.
More scopes only appear when you introduce a nested function (or lambda) into the picture. These will behave pretty much as you'd expect however. The nested function can access everything in the local scope, as well as anything in the enclosing function's scope. eg.
def foo():
x=4
def bar():
print x # Accesses x from foo's scope
bar() # Prints 4
x=5
bar() # Prints 5
Restrictions:
Variables in scopes other than the local function's variables can be accessed, but can't be rebound to new parameters without further syntax. Instead, assignment will create a new local variable instead of affecting the variable in the parent scope. For example:
global_var1 = []
global_var2 = 1
def func():
# This is OK: It's just accessing, not rebinding
global_var1.append(4)
# This won't affect global_var2. Instead it creates a new variable
global_var2 = 2
local1 = 4
def embedded_func():
# Again, this doen't affect func's local1 variable. It creates a
# new local variable also called local1 instead.
local1 = 5
print local1
embedded_func() # Prints 5
print local1 # Prints 4
In order to actually modify the bindings of global variables from within a function scope, you need to specify that the variable is global with the global keyword. Eg:
global_var = 4
def change_global():
global global_var
global_var = global_var + 1
Currently there is no way to do the same for variables in enclosing function scopes, but Python 3 introduces a new keyword, "nonlocal
" which will act in a similar way to global, but for nested function scopes.
You can use toFixed() to do that
var twoPlacedFloat = parseFloat(yourString).toFixed(2)
Accurate and fast will give output in seconds:
let startDate = new Date()
let endDate = new Date("yyyy-MM-dd'T'HH:mm:ssZ");
let seconds = Math.round((endDate.getTime() - startDate.getTime()) / 1000);
You could use a navigation property if its available. It produces an inner join in the SQL.
from s in db.Services
where s.ServiceAssignment.LocationId == 1
select s
Changing this key worked for me:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Personal
The location didn't exist.
You can create a generic extension method and then use it on the object like:
public static class Extensions
{
public static KeyValuePair<TKey, TValue> ToKeyValuePair<TKey, TValue>(this Object obj)
{
// if obj is null throws exception
Contract.Requires(obj != null);
// gets the type of the obj parameter
var type = obj.GetType();
// checks if obj is of type KeyValuePair
if (type.IsGenericType && type == typeof(KeyValuePair<TKey, TValue>))
{
return new KeyValuePair<TKey, TValue>(
(TKey)type.GetProperty("Key").GetValue(obj, null),
(TValue)type.GetProperty("Value").GetValue(obj, null)
);
}
// if obj type does not match KeyValuePair throw exception
throw new ArgumentException($"obj argument must be of type KeyValuePair<{typeof(TKey).FullName},{typeof(TValue).FullName}>");
}
and usage would be like:
KeyValuePair<string,long> kvp = obj.ToKeyValuePair<string,long>();
You need to give the user table an alias the second time you join to it
e.g.
SELECT article . * , section.title, category.title, user.name, u2.name
FROM article
INNER JOIN section ON article.section_id = section.id
INNER JOIN category ON article.category_id = category.id
INNER JOIN user ON article.author_id = user.id
LEFT JOIN user u2 ON article.modified_by = u2.id
WHERE article.id = '1'
Placing your list view in a Flexible widget may also help,
Flexible( fit: FlexFit.tight, child: _buildYourListWidget(..),)
Probably the easiest and most secure way in BASH 3 and above is:
var="string to split"
read -ra arr <<<"$var"
(where arr
is the array which takes the split parts of the string) or, if there might be newlines in the input and you want more than just the first line:
var="string to split"
read -ra arr -d '' <<<"$var"
(please note the space in -d ''
; it cannot be omitted), but this might give you an unexpected newline from <<<"$var"
(as this implicitly adds an LF at the end).
Example:
touch NOPE
var="* a *"
read -ra arr <<<"$var"
for a in "${arr[@]}"; do echo "[$a]"; done
Outputs the expected
[*]
[a]
[*]
as this solution (in contrast to all previous solutions here) is not prone to unexpected and often uncontrollable shell globbing.
Also this gives you the full power of IFS as you probably want:
Example:
IFS=: read -ra arr < <(grep "^$USER:" /etc/passwd)
for a in "${arr[@]}"; do echo "[$a]"; done
Outputs something like:
[tino]
[x]
[1000]
[1000]
[Valentin Hilbig]
[/home/tino]
[/bin/bash]
As you can see, spaces can be preserved this way, too:
IFS=: read -ra arr <<<' split : this '
for a in "${arr[@]}"; do echo "[$a]"; done
outputs
[ split ]
[ this ]
Please note that the handling of IFS
in BASH is a subject on its own, so do your tests; some interesting topics on this:
unset IFS
: Ignores runs of SPC, TAB, NL and on line starts and endsIFS=''
: No field separation, just reads everythingIFS=' '
: Runs of SPC (and SPC only)Some last examples:
var=$'\n\nthis is\n\n\na test\n\n'
IFS=$'\n' read -ra arr -d '' <<<"$var"
i=0; for a in "${arr[@]}"; do let i++; echo "$i [$a]"; done
outputs
1 [this is]
2 [a test]
while
unset IFS
var=$'\n\nthis is\n\n\na test\n\n'
read -ra arr -d '' <<<"$var"
i=0; for a in "${arr[@]}"; do let i++; echo "$i [$a]"; done
outputs
1 [this]
2 [is]
3 [a]
4 [test]
BTW:
If you are not used to $'ANSI-ESCAPED-STRING'
get used to it; it's a timesaver.
If you do not include -r
(like in read -a arr <<<"$var"
) then read does backslash escapes. This is left as exercise for the reader.
For the second question:
To test for something in a string I usually stick to case
, as this can check for multiple cases at once (note: case only executes the first match, if you need fallthrough use multiple case
statements), and this need is quite often the case (pun intended):
case "$var" in
'') empty_var;; # variable is empty
*' '*) have_space "$var";; # have SPC
*[[:space:]]*) have_whitespace "$var";; # have whitespaces like TAB
*[^-+.,A-Za-z0-9]*) have_nonalnum "$var";; # non-alphanum-chars found
*[-+.,]*) have_punctuation "$var";; # some punctuation chars found
*) default_case "$var";; # if all above does not match
esac
So you can set the return value to check for SPC like this:
case "$var" in (*' '*) true;; (*) false;; esac
Why case
? Because it usually is a bit more readable than regex sequences, and thanks to Shell metacharacters it handles 99% of all needs very well.
Here is a simple way to implement ls
command using c
. To run use for example ./xls /tmp
#include<stdio.h>
#include <dirent.h>
void main(int argc,char *argv[])
{
DIR *dir;
struct dirent *dent;
dir = opendir(argv[1]);
if(dir!=NULL)
{
while((dent=readdir(dir))!=NULL)
{
if((strcmp(dent->d_name,".")==0 || strcmp(dent->d_name,"..")==0 || (*dent->d_name) == '.' ))
{
}
else
{
printf(dent->d_name);
printf("\n");
}
}
}
close(dir);
}
If you are working on windows, you can use pywin32
(old link: see update below).
I found an example here:
import win32com.client
wmi = win32com.client.GetObject ("winmgmts:")
for usb in wmi.InstancesOf ("Win32_USBHub"):
print usb.DeviceID
Update Apr 2020:
'pywin32' release versions from 218 and up can be found here at github. Current version 227.
Here is another solution, If you are using ES6 using spread operator:
var arr = [0, 21, 22, 7];
const indexOfMaxValue = arr.indexOf(Math.max(...arr));
Pretty late but this might help someone. The current answers assumes you are using the same file for your connections and models.
In real life, there is a high chance that you are splitting your models into different files. You can use something like this in your main file:
mongoose.connect('mongodb://localhost/default');
const db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', () => {
console.log('connected');
});
which is just how it is described in the docs. And then in your model files, do something like the following:
import mongoose, { Schema } from 'mongoose';
const userInfoSchema = new Schema({
createdAt: {
type: Date,
required: true,
default: new Date(),
},
// ...other fields
});
const myDB = mongoose.connection.useDb('myDB');
const UserInfo = myDB.model('userInfo', userInfoSchema);
export default UserInfo;
Where myDB is your database name.
If I'm understanding the type of window you're talking about, wouldn't $(window).unload() (for the dialog window) give you the hook you need?
(And if I misunderstood, and you're talking about a dialog box made via CSS rather than a pop-up browser window, then all the ways of closing that window are elements you could register click handers for.)
Edit: Ah, I see now you're talking about jquery-ui dialogs, which are made via CSS. You can hook the X which closes the window by registering a click handler for the element with the class ui-dialog-titlebar-close.
More useful, perhaps, is you tell you how to figure that out quickly. While displaying the dialog, just pop open FireBug and Inspect the elements that can close the window. You'll instantly see how they are defined and that gives you what you need to register the click handlers.
So to directly answer your question, I believe the answer is really "no" -- there's isn't a close event you can hook, but "yes" -- you can hook all the ways to close the dialog box fairly easily and get what you want.
Swift 5.1. Use with two extension, method return CALayer, so you would reuse it to update frames.
enum Border: Int {
case top = 0
case bottom
case right
case left
}
extension UIView {
func addBorder(for side: Border, withColor color: UIColor, borderWidth: CGFloat) -> CALayer {
let borderLayer = CALayer()
borderLayer.backgroundColor = color.cgColor
let xOrigin: CGFloat = (side == .right ? frame.width - borderWidth : 0)
let yOrigin: CGFloat = (side == .bottom ? frame.height - borderWidth : 0)
let width: CGFloat = (side == .right || side == .left) ? borderWidth : frame.width
let height: CGFloat = (side == .top || side == .bottom) ? borderWidth : frame.height
borderLayer.frame = CGRect(x: xOrigin, y: yOrigin, width: width, height: height)
layer.addSublayer(borderLayer)
return borderLayer
}
}
extension CALayer {
func updateBorderLayer(for side: Border, withViewFrame viewFrame: CGRect) {
let xOrigin: CGFloat = (side == .right ? viewFrame.width - frame.width : 0)
let yOrigin: CGFloat = (side == .bottom ? viewFrame.height - frame.height : 0)
let width: CGFloat = (side == .right || side == .left) ? frame.width : viewFrame.width
let height: CGFloat = (side == .top || side == .bottom) ? frame.height : viewFrame.height
frame = CGRect(x: xOrigin, y: yOrigin, width: width, height: height)
}
}
IntelliJ IDEA Ultimate
Add your main class to IntelliJ Spring Application Context, for example Application.java
File
-> Project Structure..
left side: Project Setting -> Modules
right side: find in your package structure
Spring
and add +
Application.java
This is because of the Stacking Context, setting a z-index will make it apply to all children as well.
You could make the two <div>
s siblings instead of descendants.
<div class="absolute"></div>
<div id="relative"></div>
If you really sure that you installed cv2 but it gives no module error. There is a solution for this. Probably you have cv2.so
file in your directory
/usr/local/lib/python2.7/site-packages/cv2.so
move this cv2.so
file to
/usr/lib/python2.7/site-packages
copy the file into site-packages directory
Here's a pure CSS solution, similar to DarkBee's answer, but without the need for an extra .wrapper
div:
.dimmed {
position: relative;
}
.dimmed:after {
content: " ";
z-index: 10;
display: block;
position: absolute;
height: 100%;
top: 0;
left: 0;
right: 0;
background: rgba(0, 0, 0, 0.5);
}
I'm using rgba here, but of course you can use other transparency methods if you like.
A good book on Subversion is Pragmatic Version Control using Subversion where your question is explained, and it gives a lot more information.
Maybe not safe and pretty but if you must:
class string
{
private $Text;
public function __construct($value)
{
$this->Text = $value;
}
public function __toString()
{
return $this->Text;
}
}
function Test123(string $s)
{
echo $s;
}
Test123(new string("Testing"));
Having my tslint
rules configuration here always replacing the line Object["values"](myObject)
with Object.values(myObject)
.
Two options if you have same issue:
(Object as any).values(myObject)
or
/*tslint:disable:no-string-literal*/
`Object["values"](myObject)`
If the "core problem" is assigning class variables using functions, an alternative is to use a metaclass (it's kind of "annoying" and "magical" and I agree that the static method should be callable inside the class, but unfortunately it isn't). This way, we can refactor the behavior into a standalone function and don't clutter the class.
class KlassMetaClass(type(object)):
@staticmethod
def _stat_func():
return 42
def __new__(cls, clsname, bases, attrs):
# Call the __new__ method from the Object metaclass
super_new = super().__new__(cls, clsname, bases, attrs)
# Modify class variable "_ANS"
super_new._ANS = cls._stat_func()
return super_new
class Klass(object, metaclass=KlassMetaClass):
"""
Class that will have class variables set pseudo-dynamically by the metaclass
"""
pass
print(Klass._ANS) # prints 42
Using this alternative "in the real world" may be problematic. I had to use it to override class variables in Django classes, but in other circumstances maybe it's better to go with one of the alternatives from the other answers.
I had the same problem, and the accepted answer didn't help me because the password wasn't stored in the keychain. I typed:
git pull https://[email protected]/mypath/myrepo.git
Then console asked me for my new password.
A simple trick is to define the $_SESSION array as a global variable. For that, edit the core.php file in the extension folder by adding this function :
public function getGlobals() {
return array(
'session' => $_SESSION,
) ;
}
Then, you'll be able to acces any session variable as :
{{ session.username }}
if you want to access to
$_SESSION['username']
You can use a script that I made. You need JRuby to run this though. https://bitbucket.org/ardee_aram/jscombiner (JSCombiner).
What sets this apart is that it watches file changes in the javascript, and combines it automatically to the script of your choice. So there is no need to manually "build" your javascript each time you test it. Hope it helps you out, I am currently using this.
Using python, here are few methods:
import statistics as st
n = int(input())
data = list(map(int, input().split()))
stdev = st.pstdev(data)
variance = st.pvariance(data)
devia = math.sqrt(variance)
mean = sum(data)/n
variance = sum([((x - mean) ** 2) for x in X]) / n
stddev = variance ** 0.5
print("{0:0.1f}".format(stddev))
variance
calculates variance of sample population pvariance
calculates variance of entire population stdev
and pstdev
in HQL you can use query parameter and set Collection with setParameterList method.
Query q = session.createQuery("SELECT entity FROM Entity entity WHERE name IN (:names)");
q.setParameterList("names", names);
I think you missed a equal sign at:
Cursor c = ourDatabase.query(DATABASE_TABLE, column, KEY_ROWID + "" + l, null, null, null, null);
Change to:
Cursor c = ourDatabase.query(DATABASE_TABLE, column, KEY_ROWID + " = " + l, null, null, null, null);
let dt = new Date('2013-03-10T02:00:00Z');
let dd = dt.getDate();
let mm = dt.getMonth() + 1;
let yyyy = dt.getFullYear();
if (dd<10) {
dd = '0' + dd;
}
if (mm<10) {
mm = '0' + mm;
}
return yyyy + '-' + mm + '-' + dd;
The + (String Concatenation) does not work on SQL Server for the image, ntext, or text data types.
In fact, image, ntext, and text are all deprecated.
ntext, text, and image data types will be removed in a future version of MicrosoftSQL Server. Avoid using these data types in new development work, and plan to modify applications that currently use them. Use nvarchar(max), varchar(max), and varbinary(max) instead.
That said if you are using an older version of SQL Server than you want to use UPDATETEXT to perform your concatenation. Which Colin Stasiuk gives a good example of in his blog post String Concatenation on a text column (SQL 2000 vs SQL 2005+).
Thanks for this post, it helped me a lot.
Dunno if it can help but I had the issue and thanks to you I found what I think is another way to solve it based on this boolean equivalence:
"A or B" is the same as "not(not A and not B)"
Thus:
IF [%var%] == [1] OR IF [%var%] == [2] ECHO TRUE
Becomes:
IF not [%var%] == [1] IF not [%var%] == [2] ECHO FALSE
If you use PHP7, use Throwable in catch
for catching user exceptions and fatal errors.
For example:
DB::beginTransaction();
try {
DB::insert(...);
DB::commit();
} catch (\Throwable $e) {
DB::rollback();
throw $e;
}
If your code must be compartable with PHP5, use Exception
and Throwable
:
DB::beginTransaction();
try {
DB::insert(...);
DB::commit();
} catch (\Exception $e) {
DB::rollback();
throw $e;
} catch (\Throwable $e) {
DB::rollback();
throw $e;
}
This isn't straightforward, but
SELECT CHAR(CURRENT DATE, ISO) FROM SYSIBM.SYSDUMMY1
returns the current date in yyyy-mm-dd format. You would have to substring and concatenate the result to get yyyymmdd.
SELECT SUBSTR(CHAR(CURRENT DATE, ISO), 1, 4) ||
SUBSTR(CHAR(CURRENT DATE, ISO), 6, 2) ||
SUBSTR(CHAR(CURRENT DATE, ISO), 9, 2)
FROM SYSIBM.SYSDUMMY1
CROSS JOIN = (INNER) JOIN = comma (",")
TL;DR The only difference between SQL CROSS JOIN, (INNER) JOIN and comma (",") (besides comma having lower precedence for evaluation order) is that (INNER) JOIN has an ON while CROSS JOIN and comma don't.
Re intermediate products
All three produce an intermediate conceptual SQL-style relational "Cartesian" product, aka cross join, of all possible combinations of a row from each table. It is ON and/or WHERE that reduce the number of rows. SQL Fiddle
The SQL Standard defines <comma> via product (7.5 1.b.ii), <cross join> aka CROSS JOIN via <comma> (7.7 1.a) and (INNER) JOIN ON <search condition> via <comma> plus WHERE (7.7 1.b).
As Wikipedia puts it:
Cross join
CROSS JOIN returns the Cartesian product of rows from tables in the join. In other words, it will produce rows which combine each row from the first table with each row from the second table.
Inner join
[...] The result of the join can be defined as the outcome of first taking the Cartesian product (or Cross join) of all records in the tables (combining every record in table A with every record in table B) and then returning all records which satisfy the join predicate.
The "implicit join notation" simply lists the tables for joining, in the FROM clause of the SELECT statement, using commas to separate them. Thus it specifies a cross join
Re OUTER JOIN see my answer What is the difference between “INNER JOIN” and “OUTER JOIN”?.
Re OUTER JOINs and using ON vs WHERE in them see my answer Conditions in LEFT JOIN (OUTER JOIN) vs INNER JOIN.
Why compare columns between tables?
When there are no duplicate rows:
Every table holds the rows that make a true statement from a certain fill-in-the-[named-]blanks statement template. (It makes a true proposition from--satisfies--a certain (characteristic) predicate.)
A base table holds the rows that make a true statement from some DBA-given statement template:
/* rows where
customer C.CustomerID has age C.Age and ...
*/
FROM Customers C
A join's intermediate product holds the rows that make a true statement from the AND of its operands' templates:
/* rows where
customer C.CustomerID has age C.Age and ...
AND movie M.Movie is rented by customer M.CustomerID and ...
*/
FROM Customers C CROSS JOIN Movies M
ON & WHERE conditions are ANDed in to give a further template. The value is again the rows that satisfy that template:
/* rows where
customer C.CustomerID has age C.Age and ...
AND movie M.Movie is rented by customer M.CustomerID and ...
AND C.CustomerID = M.CustomerID
AND C.Age >= M.[Minimum Age]
AND C.Age = 18
*/
FROM Customers C INNER JOIN Movies M
ON C.CustomerID = M.CustomerID
AND C.Age >= M.[Minimum Age]
WHERE C.Age = 18
In particular, comparing columns for (SQL) equality between tables means that the rows kept from the product from the joined tables' parts of the template have the same (non-NULL) value for those columns. It's just coincidental that a lot of rows are typically removed by equality comparisons between tables--what is necessary and sufficient is to characterize the rows you want.
Just write SQL for the template for the rows you want!
Re the meaning of queries (and tables vs conditions) see:
How to get matching data from another SQL table for two different columns: Inner Join and/or Union?
Is there any rule of thumb to construct SQL query from a human-readable description?
Overloading "cross join"
Unfortunately the term "cross join" gets used for:
These various meanings get confounded. (Eg as in other answers and comments here.)
Using CROSS JOIN vs (INNER) JOIN vs comma
The common convention is:
Typically also conditions not on pairs of tables are kept for a WHERE. But they may have to be put in a(n INNER) JOIN ON to get appropriate rows for the argument to a RIGHT, LEFT or FULL (OUTER) JOIN.
Re "Don't use comma" Mixing comma with explicit JOIN can mislead because comma has lower precedence. But given the role of the intermediate product in the meaning of CROSS JOIN, (INNER) JOIN and comma, arguments for the convention above of not using it at all are shaky. A CROSS JOIN or comma is just like an (INNER) JOIN that's ON a TRUE condition. An intermediate product, ON and WHERE all introduce an AND in the corresponding predicate. However else INNER JOIN ON can be thought of--say, generating an output row only when finding a pair of input rows that satisfies the ON condition--it nevertheless returns the cross join rows that satisfy the condition. The only reason ON had to supplement comma in SQL was to write OUTER JOINs. Of course, an expression should make its meaning clear; but what is clear depends on what things are taken to mean.
Re Venn diagrams A Venn diagram with two intersecting circles can illustrate the difference between output rows for INNER, LEFT, RIGHT & FULL JOINs for the same input. And when the ON is unconditionally TRUE, the INNER JOIN result is the same as CROSS JOIN. Also it can illustrate the input and output rows for INTERSECT, UNION & EXCEPT. And when both inputs have the same columns, the INTERSECT result is the same as for standard SQL NATURAL JOIN, and the EXCEPT result is the same as for certain idioms involving LEFT & RIGHT JOIN. But it does not illustrate how (INNER) JOIN works in general. That just seems plausible at first glance. It can identify parts of input and/or output for special cases of ON, PKs (primary keys), FKs (foreign keys) and/or SELECT. All you have to do to see this is to identify what exactly are the elements of the sets represented by the circles. (Which muddled presentations never make clear.) Remember that in general for joins output rows have different headings from input rows. And SQL tables are bags not sets of rows with NULLs.
If you're using jQuery and want to keep using indexOf without worrying about compatibility issues, you can do this :
if (!Array.prototype.indexOf) {
Array.prototype.indexOf = function(val) {
return jQuery.inArray(val, this);
};
}
This is helpful when you want to keep using indexOf
but provide a fallback when it's not available.
In the parent process, fork()'s return value is the process ID of the child process. Stuff that value away somewhere for when you need to terminate the child process. fork() returns zero(0) in the child process.
When you need to terminate the child process, use the kill(2) function with the process ID returned by fork(), and the signal you wish to deliver (e.g. SIGTERM).
Remember to call wait() on the child process to prevent any lingering zombies.
Solution on link http://tutsnare.com/laravel-command-not-found-ubuntu-mac/
In terminal
# download installer
composer global require "laravel/installer=~1.1"
#setting up path
export PATH="~/.composer/vendor/bin:$PATH"
# check laravel command
laravel
# download installer
composer global require "laravel/installer=~1.1"
nano ~/.bashrc
#add
alias laravel='~/.composer/vendor/bin/laravel'
source ~/.bashrc
laravel
# going to html dir to create project there
cd /var/www/html/
# install project in blog dir.
laravel new blog
Apart from the similarities i.e. Task.Run() being a shorthand for Task.Factory.StartNew(), there is a minute difference between their behaviour in case of sync and async delegates.
Suppose there are following two methods:
public async Task<int> GetIntAsync()
{
return Task.FromResult(1);
}
public int GetInt()
{
return 1;
}
Now consider the following code.
var sync1 = Task.Run(() => GetInt());
var sync2 = Task.Factory.StartNew(() => GetInt());
Here both sync1 and sync2 are of type Task<int>
However, difference comes in case of async methods.
var async1 = Task.Run(() => GetIntAsync());
var async2 = Task.Factory.StartNew(() => GetIntAsync());
In this scenario, async1 is of type Task<int>
, however async2 is of type Task<Task<int>>
Destructuring into dynamically named variables is impossible in JavaScript as discussed in this question.
To set keys dynamically, you can use reduce function without mutating object as follows:
const getSubset = (obj, ...keys) => keys.reduce((a, c) => ({ ...a, [c]: obj[c] }), {});_x000D_
_x000D_
const elmo = { _x000D_
color: 'red',_x000D_
annoying: true,_x000D_
height: 'unknown',_x000D_
meta: { one: '1', two: '2'}_x000D_
}_x000D_
_x000D_
const subset = getSubset(elmo, 'color', 'annoying')_x000D_
console.log(subset)
_x000D_
Should note that you're creating a new object on every iteration though instead of updating a single clone. – mpen
below is a version using reduce with single clone (updating initial value passed in to reduce).
const getSubset = (obj, ...keys) => keys.reduce((acc, curr) => {_x000D_
acc[curr] = obj[curr]_x000D_
return acc_x000D_
}, {})_x000D_
_x000D_
const elmo = { _x000D_
color: 'red',_x000D_
annoying: true,_x000D_
height: 'unknown',_x000D_
meta: { one: '1', two: '2'}_x000D_
}_x000D_
_x000D_
const subset = getSubset(elmo, 'annoying', 'height', 'meta')_x000D_
console.log(subset)
_x000D_
DataGridViewColumn column0 = dataGridViewGroup.Columns[0];
DataGridViewColumn column1 = dataGridViewGroup.Columns[1];
column1.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
column1.Width = 120;
(NOT on Windows!)
This made me tear my hair out for a week, so I hope this will help someone
I tried everything short of re-installing Anaconda and/or Jupyter.
Setup
./anaconda3/bin/python
)/usr/bin/python
and /usr/bin/python3
(but these were not being used as most of the work was done in Jupyter's terminal)Fix
In Jupyter's terminal:
cp /usr/lib64/libssl.so.10 ./anaconda3/lib/libssl.so.1.0.0
cp /usr/lib64/libcrypto.so.10 ./anaconda3/lib/libcrypto.so.1.0.0
What triggered this?
So, this was all working until I tried to do a conda install conda-forge
I'm not sure what happened, but conda must have updated openssl
on the box (I'm guessing) so after this, everything broke.
Basically, unknown to me, conda had updated openssl, but somehow deleted the old libraries and replaced it with libssl.so.1.1
and libcrypto.so.1.1
.
Python3, I guess, was compiled to look for libssl.so.1.0.0
In the end, the key to diagnosis was this:
python -c "import ssl; print (ssl.OPENSSL_VERSION)"
gave the clue library "libssl.so.1.0.0" not found
The huge assumption I made is that the yum
version of ssl is the same as the conda
version, so just renaming the shared object might work, and it did.
My other solution was to re-compile python, re-install anaconda, etc, but in the end I'm glad I didn't need to.
Hope this helps you guys out.
Another thought that ignores parentheses and treats the for
as a construct holding three semicolon-delimited values:
for\s*\([^;]+;[^;]+;[^;]+\)\s*;
This option works even when split over multiple lines (once MULTILINE enabled), but assumes that for ( ... ; ... ; ... )
is the only valid construct, so wouldn't work with a for ( x in y )
construct, or other deviations.
Also assumes that there are no functions containing semi-colons as arguments, such as:
for ( var i = 0; i < ListLen('a;b;c',';') ; i++ );
Whether this is a likely case depends on what you're actually doing this for.
You don't use the :
syntax - pull
always modifies the currently checked-out branch. Thus:
git pull origin my_remote_branch
while you have my_local_branch
checked out will do what you want.
Since you already have the tracking branch set, you don't even need to specify - you could just do...
git pull
while you have my_local_branch
checked out, and it will update from the tracked branch.
As noted in the release email, linked to from the release tweet and noted in large orange warning that appears on the front page of the documentation, and less orange, but still present, in the readme on the repository and the release on pypi:
xlrd has explicitly removed support for anything other than xls files.
In your case, the solution is to:
openpyxl
: https://openpyxl.readthedocs.io/en/stable/df1 = pd.read_excel(
os.path.join(APP_PATH, "Data", "aug_latest.xlsm"),
engine='openpyxl',
)
Don't scroll the IFrame page or its content, scroll the parent page. If you control the IFrame content, you can use the iframe-resizer library to turn the iframe element itself into a proper block level element, with a natural/correct/native height. Also, don't attempt to position (fixed, absolute) your iframe in the parent page, or present an iframe in a modal window, especially if it has form elements.
I also suspect that iOS Safari has a non-standards behavior that expands your iframe's height to its natural height, much like the iframe-resizer library will do for desktop browsers, which seem to render responsive iframe content at height 0px or 150px or some other not useful default. If you need to contrain width, try a max-width style inside the iframe.
I just had the same problem, and I could fix it by just putting a comma and not a period/full stop in the number because of French localization.
So it works with:
2 is OK
2,5 is OK
2.5 is KO (The number is considered "illegal" and you receive empty value).
I've found that a good solution to this type of question is:
:%!sed ...
(or perl if you prefer). IOW, rather than learning vim's regex peculiarities, use a tool you already know. Using perl would make the ? modifier work to ungreedy the match.
Use Convert.ToDouble(value)
rather than (double)value
. It takes an object
and supports all of the types you asked for! :)
Also, your method is always returning a string
in the code above; I'd recommend having the method indicate so, and give it a more obvious name (public string FormatLargeNumber(object value)
)
I know it's already an old question, but i had the same error today. For me setting the connection variable on model did the work.
/**
* Table properties
*/
protected $connection = 'mysql-utf8';
protected $table = 'notification';
protected $primaryKey = 'id';
I don't know if the issue was with the database (probably), but the texts fields with special chars (like ~, ´ e etc) were all messed up.
---- Editing
That $connection var is used to select wich db connection your model will use. Sometimes it happens that in database.php (under /config folder) you have multiples connections and the default one is not using UTF-8 charset.
In any case, be sure to properly use charset and collation into your connection.
'connections' => [
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE', 'your_database'),
'username' => env('DB_USERNAME', 'root'),
'password' => env('DB_PASSWORD', 'database_password'),
'unix_socket' => env('DB_SOCKET', ''),
'prefix' => '',
'strict' => false,
'engine' => null
],
'mysql-utf8' => [
'driver' => 'mysql',
'host' => env('DB_HOST', '127.0.0.1'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE', 'your_database'),
'username' => env('DB_USERNAME', 'root'),
'password' => env('DB_PASSWORD', 'database_password'),
'unix_socket' => env('DB_SOCKET', ''),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
'engine' => null
],
var f = "how to stop Javascript forEach?".split(' ');
f.forEach(function (a,b){
console.info(b+1);
if (a == 'stop') {
console.warn("\tposition: \'stop\'["+(b+1)+"] \r\n\tall length: " + (f.length));
f.length = 0; //<--!!!
}
});
There are two ways.
With attach
$ sudo docker attach 665b4a1e17b6 #by ID
With exec
$ sudo docker exec - -t 665b4a1e17b6 #by ID
My gut feeling is that this is (again) a mac/OSX-thing: the front end and the back end assume a different location for the unix-domain socket (which functions as a rendezvous point).
Checklist:
ps aux | grep postgres | grep -v grep
should do the trickfind / -name .s.PGSQL.5432 -ls
(the socket used to be in /tmp; you could start looking there)If postgres is running, and the socket actually exists, you could use:
psql -h /the/directory/where/the/socket/was/found mydbname
(which attempts to connect to the unix-domain socket)
; you should now get the psql prompt: try \d
and then \q
to quit. You could also
try:
psql -h localhost mydbname
.(which attempts to connect to localhost (127.0.0.1)
If these attempts fail because of insufficient authorisation, you could alter pg_hba.conf (and SIGHUP or restart) In this case: also check the logs.
A similar question: Can't get Postgres started
Note: If you can get to the psql prompt, the quick fix to this problem is just to change your config/database.yml
, add:
host: localhost
or you could try adding:
host: /the/directory/where/the/socket/was/found
In my case, host: /tmp
jQuery
and a small variation of @Joepreludian's answer above:.one(...)
instead on .on(...) or .submit(...)
named
function instead of anonymous function
since we will be referring it within the callback
.$('form#my-form').one('submit', function myFormSubmitCallback(evt) {
evt.stopPropagation();
evt.preventDefault();
var $this = $(this);
if (allIsWell) {
$this.submit(); // submit the form and it will not re-enter the callback because we have worked with .one(...)
} else {
$this.one('submit', myFormSubmitCallback); // lets get into the callback 'one' more time...
}
});
allIsWell
variable in the below snippet to true
or false
to test the functionality:$('form#my-form').one('submit', function myFormSubmitCallback(evt){_x000D_
evt.stopPropagation();_x000D_
evt.preventDefault();_x000D_
var $this = $(this);_x000D_
var allIsWell = $('#allIsWell').get(0).checked;_x000D_
if(allIsWell) {_x000D_
$this.submit();_x000D_
} else {_x000D_
$this.one('submit', myFormSubmitCallback);_x000D_
}_x000D_
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<form action="/" id="my-form">_x000D_
<input name="./fname" value="John" />_x000D_
<input name="./lname" value="Smith" />_x000D_
<input type="submit" value="Lets Do This!" />_x000D_
<br>_x000D_
<label>_x000D_
<input type="checkbox" value="true" id="allIsWell" />_x000D_
All Is Well_x000D_
</label>_x000D_
</form>
_x000D_
Good Luck...
For immutable data types:
l = [0] * 100
# [0, 0, 0, 0, 0, ...]
l = ['foo'] * 100
# ['foo', 'foo', 'foo', 'foo', ...]
For values that are stored by reference and you may wish to modify later (like sub-lists, or dicts):
l = [{} for x in range(100)]
(The reason why the first method is only a good idea for constant values, like ints or strings, is because only a shallow copy is does when using the <list>*<number>
syntax, and thus if you did something like [{}]*100
, you'd end up with 100 references to the same dictionary - so changing one of them would change them all. Since ints and strings are immutable, this isn't a problem for them.)
If you want to add to an existing list, you can use the extend()
method of that list (in conjunction with the generation of a list of things to add via the above techniques):
a = [1,2,3]
b = [4,5,6]
a.extend(b)
# a is now [1,2,3,4,5,6]
Right click on the project Configure > convert to Maven project
Then you can see all the Maven related Menu for you project.
Emacs expects one of db, sqlite, sqlite2 or sqlite3 in the default configuration for sql-sqlite mode.
Maybe you're not using the latest version of a JSON for Java Library.
json-simple
has not been updated for a long time, while JSON-Java
was updated 2 month ago.
JSON-Java
can be found on GitHub, here is the link to its repo: https://github.com/douglascrockford/JSON-java
After switching the library, you can refer to my sample code down below:
public static void main(String[] args) {
String JSON = "{\"LanguageLevels\":{\"1\":\"Pocz\\u0105tkuj\\u0105cy\",\"2\":\"\\u015arednioZaawansowany\",\"3\":\"Zaawansowany\",\"4\":\"Ekspert\"}}\n";
JSONObject jsonObject = new JSONObject(JSON);
JSONObject getSth = jsonObject.getJSONObject("LanguageLevels");
Object level = getSth.get("2");
System.out.println(level);
}
And as JSON-Java
open-sourced, you can read the code and its document, they will guide you through.
Hope that it helps.
i think a loop can be used.
1 - check if the last index of substring is not the end of the main string.
2 - take a new substring from the last index of the substring to the last index of the main string and check if it contains the search string
3 - repeat the steps in a loop
first search for tabs in your file : /^I :set expandtab :retab
will work.
I think this should do the work:
File dir = new File(dirname);
String[] files = dir.list();
This way you have files and dirs. Now use recursion and do the same for dirs (File
class has isDirectory()
method).
The reason is because varargs give the option of being called with a non-parametrized object array. So if your type was List < A > ... , it can also be called with List[] non-varargs type.
Here is an example:
public static void testCode(){
List[] b = new List[1];
test(b);
}
@SafeVarargs
public static void test(List<A>... a){
}
As you can see List[] b can contain any type of consumer, and yet this code compiles. If you use varargs, then you are fine, but if you use the method definition after type-erasure - void test(List[]) - then the compiler will not check the template parameter types. @SafeVarargs will suppress this warning.
Try looking at Double.TryParse() if you are using .NET 1.1/2.0/3.0/3.5/4.0/4.5
The programming language of iOS(and Mac OS) is Objective-C and C. You have to use Xcode platform to develop iOS apps, on the next version that is now available on beta release, Xcode 4 supports also C++.
From: hxxp://dbaspot.c om/postgresql/348627-pg_dump-t-give-where-condition.html (NOTE: the link is now broken)
# create temp table with the data
psql mydb
CREATE TABLE temp1 (LIKE mytable);
INSERT INTO temp1 SELECT * FROM mytable WHERE myconditions;
\q
# export the data to a sql file
pg_dump --data-only --column-inserts -t temp1 mtdb > out.sql
psql mydb
DROP TABLE temp1;
\q
# import temp1 rows in another database
cat out.sql | psql -d [other_db]
psql other_db
INSERT INTO mytable (SELECT * FROM temp1);
DROP TABLE temp1;
Another method useful in remotes
# export a table csv and import in another database
psql-remote> COPY elements TO '/tmp/elements.csv' DELIMITER ',' CSV HEADER;
$ scp host.com:/tmp/elements.csv /tmp/elements.csv
psql-local> COPY elements FROM '/tmp/elements.csv' DELIMITER ',' CSV;
The shortest,
git config -l
shows all inherited values from: system, global and local
how i solve it in Eclipse
In Maven project, You can build jar automatically using Maven War plugin by setting archiveClasses
to true
. Example below.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<archiveClasses>true</archiveClasses>
</configuration>
</plugin>
If myString contains an account number that begins at offset 6 and has length 9, then you can extract the account number this way: acct = myString[6:][:9]
.
If the OP accepts that, they might want to try, in an experimental fashion,
myString[2:][:999999]
It works - no error is raised, and no default 'string padding' occurs.
Fast forward to 2018 and C++17.
static_assert 'works' at compile time only
using namespace std::literals;
namespace STANDARD {
constexpr
inline
auto
compiletime_static_string_view_constant() {
// make and return string view literal
// will stay the same for the whole application lifetime
// will exhibit standard and expected interface
// will be usable at both
// runtime and compile time
// by value semantics implemented for you
auto when_needed_ = "compile time"sv;
return when_needed_ ;
}
};
Above is a proper and legal standard C++ citizen. It can get readily involved in any and all std:: algorithms, containers, utilities and a such. For example:
// test the resilience
auto return_by_val = []() {
auto return_by_val = []() {
auto return_by_val = []() {
auto return_by_val = []() {
return STANDARD::compiletime_static_string_view_constant();
};
return return_by_val();
};
return return_by_val();
};
return return_by_val();
};
// actually a run time
_ASSERTE(return_by_val() == "compile time");
// compile time
static_assert(
STANDARD::compiletime_static_string_view_constant()
== "compile time"
);
Enjoy the standard C++
The accepted answer wasn't working for me when trying to parse the registry for uninstall strings, and execute them. Turns out I didn't need the call to Invoke-Expression
after all.
I finally came across this nice template for seeing how to execute uninstall strings:
$path = 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall'
$app = 'MyApp'
$apps= @{}
Get-ChildItem $path |
Where-Object -FilterScript {$_.getvalue('DisplayName') -like $app} |
ForEach-Object -process {$apps.Set_Item(
$_.getvalue('UninstallString'),
$_.getvalue('DisplayName'))
}
foreach ($uninstall_string in $apps.GetEnumerator()) {
$uninstall_app, $uninstall_arg = $uninstall_string.name.split(' ')
& $uninstall_app $uninstall_arg
}
This works for me, namely because $app
is an in house application that I know will only have two arguments. For more complex uninstall strings you may want to use the join operator. Also, I just used a hash-map, but really, you'd probably want to use an array.
Also, if you do have multiple versions of the same application installed, this uninstaller will cycle through them all at once, which confuses MsiExec.exe
, so there's that too.
If all you are trying to do is get the value out of the hashmap itself, you can do something like the following:
for (Object key : map.keySet()) {
Object value = map.get(key);
//TODO: this
}
Or, you can iterate over the entries of a map, if that is what you are interested in:
for (Map.Entry<Object, Object> entry : map.entrySet()) {
Object key = entry.getKey();
Object value = entry.getValue();
//TODO: other cool stuff
}
As a community, we might be able to give you better/more appropriate answers if we had some idea why you needed the indexes or what you thought the indexes could do for you.
The schema object naming rules may also be of some use:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/sql_elements008.htm#sthref723
$this->db1->where('tennant_id', $tennant_id);
$this->db1->order_by('id', 'DESC');
return $this->db1->get('courses')->result();
apt–get: command not found
For Debian based Linux distributions:
Try to use sudo apt install <package>
instead of the usual sudo apt-get install <package>
From man apt
apt provides a high-level commandline interface for the package management system. It is intended as an end user interface and enables some options better suited for interactive usage by default compared to more specialized APT tools like apt-get(8) and apt-cache(8).
it is because view child require two argument try like this
@ViewChild('nameInput', { static: false, }) nameInputRef: ElementRef;
@ViewChild('amountInput', { static: false, }) amountInputRef: ElementRef;
Mistake in original post is acquire() call set inside the try loop. Here is a correct approach to use "binary" semaphore (Mutex):
semaphore.acquire();
try {
//do stuff
} catch (Exception e) {
//exception stuff
} finally {
semaphore.release();
}
I've found the solution :
You have to add the html5=1
in the src attribute of the iframe :
<iframe src="http://www.youtube.com/embed/dP15zlyra3c?html5=1"></iframe>
The video will be displayed as HTML5 if available, or fallback into flash player.
Redirect subdomain directory:
RewriteCond %{HTTP_HOST} ^([^.]+)\.(archive\.example\.com)$ [NC]
RewriteRule ^ http://%2/%1%{REQUEST_URI} [L,R=301]
Since Go 1.11+, GOPATH is no longer recommended, the new way is using Go Modules.
simple
:Create a directory:
mkdir simple
cd simple
Create a new module:
go mod init github.com/username/simple
# Here, the module name is: github.com/username/simple.
# You're free to choose any module name.
# It doesn't matter as long as it's unique.
# It's better to be a URL: so it can be go-gettable.
Put all your files in that directory.
Finally, run:
go run .
Alternatively, you can create an executable program by building it:
go build .
# then:
./simple # if you're on xnix
# or, just:
simple # if you're on Windows
For more information, you may read this.
Go has included support for versioned modules as proposed here since 1.11. The initial prototype vgo was announced in February 2018. In July 2018, versioned modules landed in the main Go repository. In Go 1.14, module support is considered ready for production use, and all users are encouraged to migrate to modules from other dependency management systems.
Spent some time working on a solution to my issue and thought it may be of interest. I ran into a problem trying to automate code generation using PowerShell 3.0 on Windows 8. The target IDE was the Keil compiler using MDK-ARM Essential Toolchain 5.24.1. A bit different from OP, as I am using PowerShell natively during the pre-build step. When I tried to #include the generated file, I received the error
fatal error: UTF-16 (LE) byte order mark detected '..\GITVersion.h' but encoding is not supported
I solved the problem by changing the line that generated the output file from:
out-file -FilePath GITVersion.h -InputObject $result
to:
out-file -FilePath GITVersion.h -Encoding ascii -InputObject $result
In addition to @KenM's answer, another important distinction is that, when loading in a saved object, you can assign the contents of an Rds
file. Not so for Rda
> x <- 1:5
> save(x, file="x.Rda")
> saveRDS(x, file="x.Rds")
> rm(x)
## ASSIGN USING readRDS
> new_x1 <- readRDS("x.Rds")
> new_x1
[1] 1 2 3 4 5
## 'ASSIGN' USING load -- note the result
> new_x2 <- load("x.Rda")
loading in to <environment: R_GlobalEnv>
> new_x2
[1] "x"
# NOTE: `load()` simply returns the name of the objects loaded. Not the values.
> x
[1] 1 2 3 4 5
NB.: Now instead of
runProguard false
you'll need to use
minifyEnabled false
A clearer solution, works in ASP.Net Core 2.1 / 3.1
Filter class
using Microsoft.AspNetCore.Authorization;
// For ASP.NET 2.1
using Microsoft.AspNetCore.Http.Internal;
// For ASP.NET 3.1
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Filters;
public class ReadableBodyStreamAttribute : AuthorizeAttribute, IAuthorizationFilter
{
public void OnAuthorization(AuthorizationFilterContext context)
{
// For ASP.NET 2.1
// context.HttpContext.Request.EnableRewind();
// For ASP.NET 3.1
// context.HttpContext.Request.EnableBuffering();
}
}
In an Controller
[HttpPost]
[ReadableBodyStream]
public string SomePostMethod()
{
//Note: if you're late and body has already been read, you may need this next line
//Note2: if "Note" is true and Body was read using StreamReader too, then it may be necessary to set "leaveOpen: true" for that stream.
HttpContext.Request.Body.Seek(0, SeekOrigin.Begin);
using (StreamReader stream = new StreamReader(HttpContext.Request.Body))
{
string body = stream.ReadToEnd();
// body = "param=somevalue¶m2=someothervalue"
}
}
For me, this worked:
rawText.replaceAll("(\\\\r\\\\n|\\\\n)", "\\\n");
Tip: use regex tester for quick testing without compiling in your environment
String newstring = "";
String target2 = "fooBar";
newstring = target2.substring("foo".length()).trim();
logger.debug("target2: {}",newstring);
// output: target2: Bar
String target3 = "FooBar";
newstring = target3.substring("foo".length()).trim();
logger.debug("target3: {}",newstring);
// output: target3: Bar
Call sys.exit
.
You can also change the pop-up options themselves, to be more convenient for your normal use. Summary:
Select SQL Server Object Explorer . Now you should be able to see the options
Give the Values 0 here to select/ Edit all the Records
Full Instructions with screenshots are here: http://m-elshazly.blogspot.com/2011/01/sql-server-2008-change-edit-top-200.html
This is how I've managed to load CURL correctly. In my case php was installed from zip package, so I had to add php directory to PATH environment variable.
[[ -d "$DIR" && ! -L "$DIR" ]] && echo "It's a directory and not a symbolic link"
N.B: Quoting variables is a good practice.
Explanation:
-d
: check if it's a directory-L
: check if it's a symbolic linkIt's similar to pass
in Python.
One use would be to stub out a function until it gets written:
future_function () { :; }
Replace the
import android.support.v7.app.AppCompatActivity;
with import androidx.appcompat.app.AppCompatActivity
L = ['L','O','L']
makeitastring = ''.join(map(str, L))
host
var url = window.location.host;
returns localhost:2679
hostname
var url = window.location.hostname;
returns localhost
I think you shouldn't prepend themesDir
. You only pass the filename of the template to flask, it will then look in a folder called templates
relative to your python file.
you put resource-ref in the description tag in web.xml
For multiple environment variables, an .env
file is more convenient:
# .env.example, committed to repo
DB_HOST=localhost
DB_USER=root
DB_PASS=s1mpl3
# .env, private, .gitignore it
DB_HOST=real-hostname.example.com
DB_USER=real-user-name
DB_PASS=REAL_PASSWORD
It's easy to use with dotenv-safe
:
npm install --save dotenv-safe
.index.js
) and directly use it with the process.env
command:require('dotenv').load()
console.log(process.env.DB_HOST)
Don't forget to ignore the .env
file in your VCS.
Your program then fails fast if a variable "defined" in .env.example
is unset either as an environment variable or in .env
.
Assuming a Windows installation, do please refer to this:
http://www.oracle-base.com/articles/misc/ManualOracleUninstall.php
- Uninstall all Oracle components using the Oracle Universal Installer (OUI).
- Run regedit.exe and delete the HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE key. This contains registry entires for all Oracle products.
- Delete any references to Oracle services left behind in the following part of the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Ora*
It should be pretty obvious which ones relate to Oracle.- Reboot your machine.
- Delete the "C:\Oracle" directory, or whatever directory is your ORACLE_BASE.
- Delete the "C:\Program Files\Oracle" directory.
- Empty the contents of your "C:\temp" directory.
- Empty your recycle bin.
Calling additional attention to some great comments that were left here:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ORACLE
key from the registry.%ORACLE_HOME%
.%PATH%
.This set of instructions happens to match an almost identical process that I had reverse-engineered myself over the years after a few messed-up Oracle installs, and has almost always met the need.
Note that even if the OUI is no longer available or doesn't work, simply following the remaining steps should still be sufficient.
(Revision #7 reverted as to not misquote the original source, and to not remove credit to the other comments that contributed to the answer. Further edits are appreciated (and then please remove this comment), if a way can be found to maintain these considerations.)
Just to update this, the standard now is:
<input type="file" name="image" accept="image/*" capture="environment">
to access the environment-facing (rear) camera, and
<input type="file" name="image" accept="image/*" capture="user">
for user-facing (front) camera. To access video, substitute "video" for "image" in name.
Tested on iPhone 5c, running iOS 10.3.3, firmware 760, works fine.
You should check that what you are passing to foreach
is an array by using the is_array function
If you are not sure it's going to be an array you can always check using the following PHP example code:
if (is_array($variable)) {
foreach ($variable as $item) {
//do something
}
}
When we does not want to own the object:
Ex:
class A
{
shared_ptr<int> sPtr1;
weak_ptr<int> wPtr1;
}
In the above class wPtr1 does not own the resource pointed by wPtr1. If the resource is got deleted then wPtr1 is expired.
To avoid circular dependency:
shard_ptr<A> <----| shared_ptr<B> <------
^ | ^ |
| | | |
| | | |
| | | |
| | | |
class A | class B |
| | | |
| ------------ |
| |
-------------------------------------
Now if we make the shared_ptr of the class B and A, the use_count of the both pointer is two.
When the shared_ptr goes out od scope the count still remains 1 and hence the A and B object does not gets deleted.
class B;
class A
{
shared_ptr<B> sP1; // use weak_ptr instead to avoid CD
public:
A() { cout << "A()" << endl; }
~A() { cout << "~A()" << endl; }
void setShared(shared_ptr<B>& p)
{
sP1 = p;
}
};
class B
{
shared_ptr<A> sP1;
public:
B() { cout << "B()" << endl; }
~B() { cout << "~B()" << endl; }
void setShared(shared_ptr<A>& p)
{
sP1 = p;
}
};
int main()
{
shared_ptr<A> aPtr(new A);
shared_ptr<B> bPtr(new B);
aPtr->setShared(bPtr);
bPtr->setShared(aPtr);
return 0;
}
output:
A()
B()
As we can see from the output that A and B pointer are never deleted and hence memory leak.
To avoid such issue just use weak_ptr in class A instead of shared_ptr which makes more sense.
Another reason could be because the filepath is empty where you are trying to write which is why it can't find it. just another reason why this error occurs.
You can use a linear gradient:
div {_x000D_
width:100px;_x000D_
height:50px;_x000D_
display:block;_x000D_
background-image: linear-gradient(to right, #000 1px, rgba(255,255,255,0) 1px), linear-gradient(to left, #000 0.1rem, rgba(255,255,255,0) 1px);_x000D_
background-position: bottom;_x000D_
background-size: 100% 25px;_x000D_
background-repeat: no-repeat;_x000D_
border-bottom: 1px solid #000;_x000D_
border-top: 1px solid red;_x000D_
}
_x000D_
<div></div>
_x000D_
Changing(Updating) my PHP version from 5.5.25
to 7.0.10
solved this problem in my case.
@media only screen and (min-width: 1140px)
should do his job, show us your css file
You can make use of ImageIO
in order to load the image from an URL and then write it to a file. Something like this:
URL url = new URL("http://google.com/pathtoaimage.jpg");
BufferedImage img = ImageIO.read(url);
File file = new File("downloaded.jpg");
ImageIO.write(img, "jpg", file);
This also allows you to convert the image to some other format if needed.
While you cannot center the option text within a select, you can lay an absolutely positioned div over the top of the select to the same effect:
#centered
{
position: absolute;
top: 10px;
left: 10px;
width: 818px;
height: 37px;
text-align: center;
font: bold 24pt calibri;
background-color: white;
z-index: 100;
}
#selectToCenter
{
position: absolute;
top: 10px;
left: 10px;
width: 840px;
height: 40px;
font: bold 24pt calibri;
}
$('#selectToCenter').on('change', function () {
$('#centered').text($(this).find('option:selected').text());
});
<select id="selectToCenter"></select>
<div id="centered"></div>
Make sure the both the div and select have fixed positions in the document.
I'm confused. You're injecting a PU into the service layer and not the persistence layer? I don't get that.
I inject the persistence layer into the service layer. The service layer contains business logic and demarcates transaction boundaries. It can include more than one DAO in a transaction.
I don't get the magic in your save() method either. How is the data saved?
In production I configure spring like this:
<jee:jndi-lookup id="entityManagerFactory" jndi-name="persistence/ThePUname" />
along with the reference in web.xml
For unit testing I do this:
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
p:dataSource-ref="dataSource" p:persistence-xml-location="classpath*:META-INF/test-persistence.xml"
p:persistence-unit-name="RealPUName" p:jpaDialect-ref="jpaDialect"
p:jpaVendorAdapter-ref="jpaVendorAdapter" p:loadTimeWeaver-ref="weaver">
</bean>
I did something like that:
HTML:
<p class='parent'>text text text</p>
<img class='child' src='idk.png'>
CSS:
.child {
visibility: hidden;
}
.parent:hover .child {
visibility: visible;
}
The first answer you posted (System is a built-in class...) is pretty spot on.
You can add that the System
class contains large portions which are native and that is set up by the JVM during startup, like connecting the System.out
printstream to the native output stream associated with the "standard out" (console).
ClassList add
var dynamic=document.getElementById("dynamic");
dynamic.classList.add("red");
dynamic.classList.add("size");
dynamic.classList.add("bold");
_x000D_
.red{
color:red;
}
.size{
font-size:40px;
}
.bold{
font-weight:800;
}
_x000D_
<div id="dynamic">dynamic css</div>
_x000D_
Try this instead:
$journalName = str_replace(' ', '_', $journalName);
to remove white space
the solution is indicated on their official website :
Failed to load class org.slf4j.impl.StaticLoggerBinder
This warning message is reported when the org.slf4j.impl.StaticLoggerBinder class could not be loaded into memory. This happens when no appropriate SLF4J binding could be found on the class path. Placing one (and only one) of slf4j-nop.jar slf4j-simple.jar, slf4j-log4j12.jar, slf4j-jdk14.jar or logback-classic.jar on the class path should solve the problem. SINCE 1.6.0 As of SLF4J version 1.6, in the absence of a binding, SLF4J will default to a no-operation (NOP) logger implementation. If you are responsible for packaging an application and do not care about logging, then placing slf4j-nop.jar on the class path of your application will get rid of this warning message. Note that embedded components such as libraries or frameworks should not declare a dependency on any SLF4J binding but only depend on slf4j-api. When a library declares a compile-time dependency on a SLF4J binding, it imposes that binding on the end-user, thus negating SLF4J's purpose.
solution : I have added to my project using maven research on intellij and i have chosen the slf4j-jdk14.jar.
Just throw any RuntimeException
from a method marked as @Transactional
.
By default all RuntimeException
s rollback transaction whereas checked exceptions don't. This is an EJB legacy. You can configure this by using rollbackFor()
and noRollbackFor()
annotation parameters:
@Transactional(rollbackFor=Exception.class)
This will rollback transaction after throwing any exception.
No, what you are looking for would be called a parent selector. CSS has none; they have been proposed multiple times but I know of no existing or forthcoming standard including them. You are correct that you would need to use something like jQuery or use additional class annotations to achieve the effect you want.
Here are some similar questions with similar results:
OK, after making a lot of test, here my concluson:
When you perform:
window.open('www.yourdomain.tld','_blank');
window.open('www.yourdomain.tld','myWindow');
or whatever you put in the destination field, this will change nothing: the new page will be opened in a new tab (so depend on user preference)
If you want the page to be opened in a new "real" window, you must put extra parameter. Like:
window.open('www.yourdomain.tld', 'mywindow','location=1,status=1,scrollbars=1, resizable=1, directories=1, toolbar=1, titlebar=1');
After testing, it seems the extra parameter you use, dont' really matter: this is not the fact you put "this parameter" or "this other one" which create the new "real window" but the fact there is new parameter(s).
But something is confused and may explain a lot of wrong answers:
This:
win1 = window.open('myurl1', 'ID_WIN');
win2 = window.open('myurl2', 'ID_WIN', 'location=1,status=1,scrollbars=1');
And this:
win2 = window.open('myurl2', 'ID_WIN', 'location=1,status=1,scrollbars=1');
win1 = window.open('myurl1', 'ID_WIN');
will NOT give the same result.
In the first case, as you first open a page without extra parameter, it will open in a new tab. And in this case, the second call will be also opened in this tab because of the name you give.
In second case, as your first call is made with extra parameter, the page will be opened in a new "real window". And in that case, even if the second call is made without the extra parameter, it will also be opened in this new "real window"... but same tab!
This mean the first call is important as it decided where to put the page.
I try to set type of column as 'timestamp' and it works for me.
This will check for empty textarea as well as will not allow only Spaces in textarea coz that looks empty too.
var txt_msg = $("textarea").val();
if (txt_msg.replace(/^\s+|\s+$/g, "").length == 0 || txt_msg=="") {
return false;
}
If you got a html page like this:
<body onbeforecopy = "return false" ondragstart = "return false" onselectstart = "return false" oncontextmenu = "return false" onselect = "document.selection.empty()" oncopy = "document.selection.empty()">
There a simple way to disable all events:
document.write(document.body.innerHTML)
You got the html content and lost other things.
You can use int casting which allows the base specification.
int(b, 2) # Convert a binary string to a decimal int.
I've investigated this issue, referring to the LayoutInflater docs and setting up a small sample demonstration project. The following tutorials shows how to dynamically populate a layout using LayoutInflater
.
Before we get started see what LayoutInflater.inflate()
parameters look like:
R.layout.main_page
)attachToRoot
is true
), or else simply an object that provides a set of LayoutParams
values for root of the returned hierarchy (if attachToRoot
is false
.)attachToRoot: Whether the inflated hierarchy should be attached to the root parameter? If false, root is only used to create the correct subclass of LayoutParams
for the root view in the XML.
Returns: The root View of the inflated hierarchy. If root was supplied and attachToRoot
is true
, this is root; otherwise it is the root of the inflated XML file.
Now for the sample layout and code.
Main layout (main.xml
):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent">
</LinearLayout>
Added into this container is a separate TextView, visible as small red square if layout parameters are successfully applied from XML (red.xml
):
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="25dp"
android:layout_height="25dp"
android:background="#ff0000"
android:text="red" />
Now LayoutInflater
is used with several variations of call parameters
public class InflaterTest extends Activity {
private View view;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ViewGroup parent = (ViewGroup) findViewById(R.id.container);
// result: layout_height=wrap_content layout_width=match_parent
view = LayoutInflater.from(this).inflate(R.layout.red, null);
parent.addView(view);
// result: layout_height=100 layout_width=100
view = LayoutInflater.from(this).inflate(R.layout.red, null);
parent.addView(view, 100, 100);
// result: layout_height=25dp layout_width=25dp
// view=textView due to attachRoot=false
view = LayoutInflater.from(this).inflate(R.layout.red, parent, false);
parent.addView(view);
// result: layout_height=25dp layout_width=25dp
// parent.addView not necessary as this is already done by attachRoot=true
// view=root due to parent supplied as hierarchy root and attachRoot=true
view = LayoutInflater.from(this).inflate(R.layout.red, parent, true);
}
}
The actual results of the parameter variations are documented in the code.
SYNOPSIS: Calling LayoutInflater
without specifying root leads to inflate call ignoring the layout parameters from the XML. Calling inflate with root not equal null
and attachRoot=true
does load the layout parameters, but returns the root object again, which prevents further layout changes to the loaded object (unless you can find it using findViewById()
).
The calling convention you most likely would like to use is therefore this one:
loadedView = LayoutInflater.from(context)
.inflate(R.layout.layout_to_load, parent, false);
To help with layout issues, the Layout Inspector is highly recommended.
A variation on the answer by @tallgirltaadaa , draw your own button in the shape of a caret:
var a = $('.MyCarouselContainer').slick({
prevArrow: '<canvas class="prevArrowCanvas a-left control-c prev slick-prev" width="15" height="50"></canvas>',
nextArrow: '<canvas class="nextArrowCanvas a-right control-c next slick-next" width="15" height="50"></canvas>'
});
function drawNextPreviousArrows(strokeColor) {
var c = $(".prevArrowCanvas")[0];
var ctx = c.getContext("2d");
ctx.clearRect(0, 0, c.width, c.height);
ctx.moveTo(15, 0);
ctx.lineTo(0, 25);
ctx.lineTo(15, 50);
ctx.lineWidth = 2;
ctx.strokeStyle = strokeColor;
ctx.stroke();
var c = $(".nextArrowCanvas")[0];
var ctx = c.getContext("2d");
ctx.clearRect(0, 0, c.width, c.height);
ctx.moveTo(0, 0);
ctx.lineTo(15, 25);
ctx.lineTo(0, 50);
ctx.lineWidth = 2;
ctx.strokeStyle = strokeColor;
ctx.stroke();
}
drawNextPreviousArrows("#cccccc");
then add the css
.slick-prev, .slick-next
height: 50px;s
}
You just had some messed up parentheses in your 2nd attempt.
var $html = $("html");
if ($html.hasClass('m320') || $html.hasClass('m768')) {
// do stuff
}
John Montgomery's, answer is great, but at least on Windows, it is missing the line
vc.release()
before
cv2.destroyWindow("preview")
Without it, the camera resource is locked, and can not be captured again before the python console is killed.
How big is your sample? Here is another option to test your data against any distribution using OpenTURNS library. In the example below, I generate a sample x of 1.000.000 numbers from a Uniform distribution and test it against a Normal distribution.
You can replace x by your data if you reshape it as x= [[x1], [x2], .., [xn]]
import openturns as ot
x = ot.Uniform().getSample(1000000)
g = ot.VisualTest.DrawQQplot(x, ot.Normal())
g
In my Jupyter Notebook, I see:
If you are writing a script, you can do it more properly
from openturns.viewer import View`
import matplotlib.pyplot as plt
View(g)
plt.show()
In WPF an image is typically loaded from a Stream or an Uri.
BitmapImage supports both and an Uri can even be passed as constructor argument:
var uri = new Uri("http://...");
var bitmap = new BitmapImage(uri);
If the image file is located in a local folder, you would have to use a file://
Uri. You could create such a Uri from a path like this:
var path = Path.Combine(Environment.CurrentDirectory, "Bilder", "sas.png");
var uri = new Uri(path);
If the image file is an assembly resource, the Uri must follow the the Pack Uri scheme:
var uri = new Uri("pack://application:,,,/Bilder/sas.png");
In this case the Visual Studio Build Action for sas.png
would have to be Resource
.
Once you have created a BitmapImage
and also have an Image control like in this XAML
<Image Name="image1" />
you would simply assign the BitmapImage to the Source
property of that Image control:
image1.Source = bitmap;
The constructor of unique_ptr<T>
accepts a raw pointer to an object of type T
(so, it accepts a T*
).
In the first example:
unique_ptr<int> uptr (new int(3));
The pointer is the result of a new
expression, while in the second example:
unique_ptr<double> uptr2 (pd);
The pointer is stored in the pd
variable.
Conceptually, nothing changes (you are constructing a unique_ptr
from a raw pointer), but the second approach is potentially more dangerous, since it would allow you, for instance, to do:
unique_ptr<double> uptr2 (pd);
// ...
unique_ptr<double> uptr3 (pd);
Thus having two unique pointers that effectively encapsulate the same object (thus violating the semantics of a unique pointer).
This is why the first form for creating a unique pointer is better, when possible. Notice, that in C++14 we will be able to do:
unique_ptr<int> p = make_unique<int>(42);
Which is both clearer and safer. Now concerning this doubt of yours:
What is also not clear to me, is how pointers, declared in this way will be different from the pointers declared in a "normal" way.
Smart pointers are supposed to model object ownership, and automatically take care of destroying the pointed object when the last (smart, owning) pointer to that object falls out of scope.
This way you do not have to remember doing delete
on objects allocated dynamically - the destructor of the smart pointer will do that for you - nor to worry about whether you won't dereference a (dangling) pointer to an object that has been destroyed already:
{
unique_ptr<int> p = make_unique<int>(42);
// Going out of scope...
}
// I did not leak my integer here! The destructor of unique_ptr called delete
Now unique_ptr
is a smart pointer that models unique ownership, meaning that at any time in your program there shall be only one (owning) pointer to the pointed object - that's why unique_ptr
is non-copyable.
As long as you use smart pointers in a way that does not break the implicit contract they require you to comply with, you will have the guarantee that no memory will be leaked, and the proper ownership policy for your object will be enforced. Raw pointers do not give you this guarantee.
From the use of 8080 I'm assuming you are using a tomcat servlet container to serve your rest api. If this is the case you can also consider to have your webserver proxy the requests to the servlet container.
With apache you would typically use mod_jk (although there are other alternatives) to serve the api trough the web server behind port 80 instead of 8080 which would solve the cross domain issue.
This is common practice, have the 'static' content in the webserver and dynamic content in the container, but both served from behind the same domain.
The url for the rest api would be http://localhost/restws/json/product/get
Here a description on how to use mod_jk to connect apache to tomcat: http://tomcat.apache.org/connectors-doc/webserver_howto/apache.html
You don't want to take care of normalizing your data in a view - what if the user changes the data that gets submitted? Instead you could take care of it in the model using the before_save
(or the before_validation
) callback. Here's an example of the relevant code for a model like yours:
class Place < ActiveRecord::Base before_save do |place| place.city = place.city.downcase.titleize place.country = place.country.downcase.titleize end end
You can also check out the Ruby on Rails guide for more info.
To answer you question more directly, something like this would work:
<%= f.text_field :city, :value => (f.object.city ? f.object.city.titlecase : '') %>
This just means if f.object.city
exists, display the titlecase
version of it, and if it doesn't display a blank string.
While cloning you might be using SSH in the dropdown list. Change it to Https and then clone.
To expand a little on Andrew's answer: The fact that regular expressions define extractors can be used to decompose the substrings matched by the regex very nicely using Scala's pattern matching, e.g.:
val Process = """([a-cA-C])([^\s]+)""".r // define first, rest is non-space
for (p <- Process findAllIn "aha bah Cah dah") p match {
case Process("b", _) => println("first: 'a', some rest")
case Process(_, rest) => println("some first, rest: " + rest)
// etc.
}
Old question but got here because I need to move content from one container to another including all the event listeners.
jQuery doesn't have a way to do it but standard DOM function appendChild does.
//assuming only one .source and one .target
$('.source').on('click',function(){console.log('I am clicked');});
$('.target')[0].appendChild($('.source')[0]);
Using appendChild removes the .source and places it into target including it's event listeners: https://developer.mozilla.org/en-US/docs/Web/API/Node.appendChild
Did find the answer on my own. My problem was, that i use two temporary tables for a join and create the second one out of the first one. But the Index was not copied during creation...
CREATE TEMPORARY TABLE tmpLivecheck (tmpid INTEGER NOT NULL AUTO_INCREMENT, PRIMARY
KEY(tmpid), INDEX(tmpid))
SELECT * FROM tblLivecheck_copy WHERE tblLivecheck_copy.devId = did;
CREATE TEMPORARY TABLE tmpLiveCheck2 (tmpid INTEGER NOT NULL, PRIMARY KEY(tmpid),
INDEX(tmpid))
SELECT * FROM tmpLivecheck;
... solved my problem.
Greetings...
String stringWithQuates = "\""+ "your,comma,separated,string" + "\"";
this will retain the comma in CSV file
This post provides some commentary on P3P and a short-cut solution that reduces the problems with IE7 and IE8.
The problem is the tv.setText(text)
. The variable tv is probably null
and you call the setText
method on that null
, which you can't.
My guess that the problem is on the findViewById
method, but it's not here, so I can't tell more, without the code.
Java 8 Style for a given date
LocalDate today = LocalDate.of(1982, Month.AUGUST, 31);
System.out.println(today.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(Locale.ENGLISH)));
System.out.println(today.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(Locale.FRENCH)));
System.out.println(today.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(Locale.JAPANESE)));
Just execute the query bellow:
DO $$ DECLARE
r RECORD;
BEGIN
FOR r IN (SELECT tablename FROM pg_tables WHERE schemaname = current_schema()) LOOP
EXECUTE 'TRUNCATE TABLE ' || quote_ident(r.tablename) || '';
END LOOP;
END $$;
I only know that when we call session.flush()
our statements are execute in database but not committed.
Suppose we don't call flush()
method on session object and if we call commit method it will internally do the work of executing statements on the database and then committing.
commit=flush+commit
(in case of functionality)
Thus, I conclude that when we call method flush() on Session object, then it doesn't get commit but hits the database and executes the query and gets rollback too.
In order to commit we use commit() on Transaction object.
In Oracle, you can simply subtract two dates and get the difference in days. Also note that unlike SQL Server or MySQL, in Oracle you cannot perform a select
statement without a from
clause. One way around this is to use the builtin dummy table, dual
:
SELECT TO_DATE('2000-01-02', 'YYYY-MM-DD') -
TO_DATE('2000-01-01', 'YYYY-MM-DD') AS DateDiff
FROM dual
In order to get the values of your parameters, you can use RouteData
.
More context would be nice. Why do you need to "extract" them in the first place? You should have an Action like:
public ActionResult Edit(int id, bool allowed) {}
In addition to the other answers, on a recent C library (Posix 2008 compliant), you could use getline. See this answer (to a related question).
head -1000 file.txt > first100lines.txt
tail --lines=+1001 file.txt > restoffile.txt
"extern
" changes the linkage. With the keyword, the function / variable is assumed to be available somewhere else and the resolving is deferred to the linker.
There's a difference between "extern" on functions and on variables: on variables it doesn't instantiate the variable itself, i.e. doesn't allocate any memory. This needs to be done somewhere else. Thus it's important if you want to import the variable from somewhere else. For functions, this only tells the compiler that linkage is extern. As this is the default (you use the keyword "static" to indicate that a function is not bound using extern linkage) you don't need to use it explicitly.
In SQL Server 2008:
Solution working with different types and with upper and lower cases.
For example, without the toLowerCase
statement, "Goodyear" will come before "doe" with an ascending sort. Run the code snippet at the bottom of my answer to view the different behaviors.
JSON DATA:
var people = [
{
"f_name" : "john",
"l_name" : "doe", // lower case
"sequence": 0 // int
},
{
"f_name" : "michael",
"l_name" : "Goodyear", // upper case
"sequence" : 1 // int
}];
JSON Sort Function:
function sortJson(element, prop, propType, asc) {
switch (propType) {
case "int":
element = element.sort(function (a, b) {
if (asc) {
return (parseInt(a[prop]) > parseInt(b[prop])) ? 1 : ((parseInt(a[prop]) < parseInt(b[prop])) ? -1 : 0);
} else {
return (parseInt(b[prop]) > parseInt(a[prop])) ? 1 : ((parseInt(b[prop]) < parseInt(a[prop])) ? -1 : 0);
}
});
break;
default:
element = element.sort(function (a, b) {
if (asc) {
return (a[prop].toLowerCase() > b[prop].toLowerCase()) ? 1 : ((a[prop].toLowerCase() < b[prop].toLowerCase()) ? -1 : 0);
} else {
return (b[prop].toLowerCase() > a[prop].toLowerCase()) ? 1 : ((b[prop].toLowerCase() < a[prop].toLowerCase()) ? -1 : 0);
}
});
}
}
Usage:
sortJson(people , "l_name", "string", true);
sortJson(people , "sequence", "int", true);
var people = [{_x000D_
"f_name": "john",_x000D_
"l_name": "doe",_x000D_
"sequence": 0_x000D_
}, {_x000D_
"f_name": "michael",_x000D_
"l_name": "Goodyear",_x000D_
"sequence": 1_x000D_
}, {_x000D_
"f_name": "bill",_x000D_
"l_name": "Johnson",_x000D_
"sequence": 4_x000D_
}, {_x000D_
"f_name": "will",_x000D_
"l_name": "malone",_x000D_
"sequence": 2_x000D_
}, {_x000D_
"f_name": "tim",_x000D_
"l_name": "Allen",_x000D_
"sequence": 3_x000D_
}];_x000D_
_x000D_
function sortJsonLcase(element, prop, asc) {_x000D_
element = element.sort(function(a, b) {_x000D_
if (asc) {_x000D_
return (a[prop] > b[prop]) ? 1 : ((a[prop] < b[prop]) ? -1 : 0);_x000D_
} else {_x000D_
return (b[prop] > a[prop]) ? 1 : ((b[prop] < a[prop]) ? -1 : 0);_x000D_
}_x000D_
});_x000D_
}_x000D_
_x000D_
function sortJson(element, prop, propType, asc) {_x000D_
switch (propType) {_x000D_
case "int":_x000D_
element = element.sort(function(a, b) {_x000D_
if (asc) {_x000D_
return (parseInt(a[prop]) > parseInt(b[prop])) ? 1 : ((parseInt(a[prop]) < parseInt(b[prop])) ? -1 : 0);_x000D_
} else {_x000D_
return (parseInt(b[prop]) > parseInt(a[prop])) ? 1 : ((parseInt(b[prop]) < parseInt(a[prop])) ? -1 : 0);_x000D_
}_x000D_
});_x000D_
break;_x000D_
default:_x000D_
element = element.sort(function(a, b) {_x000D_
if (asc) {_x000D_
return (a[prop].toLowerCase() > b[prop].toLowerCase()) ? 1 : ((a[prop].toLowerCase() < b[prop].toLowerCase()) ? -1 : 0);_x000D_
} else {_x000D_
return (b[prop].toLowerCase() > a[prop].toLowerCase()) ? 1 : ((b[prop].toLowerCase() < a[prop].toLowerCase()) ? -1 : 0);_x000D_
}_x000D_
});_x000D_
}_x000D_
}_x000D_
_x000D_
function sortJsonString() {_x000D_
sortJson(people, 'l_name', 'string', $("#chkAscString").prop("checked"));_x000D_
display();_x000D_
}_x000D_
_x000D_
function sortJsonInt() {_x000D_
sortJson(people, 'sequence', 'int', $("#chkAscInt").prop("checked"));_x000D_
display();_x000D_
}_x000D_
_x000D_
function sortJsonUL() {_x000D_
sortJsonLcase(people, 'l_name', $('#chkAsc').prop('checked'));_x000D_
display();_x000D_
}_x000D_
_x000D_
function display() {_x000D_
$("#data").empty();_x000D_
$(people).each(function() {_x000D_
$("#data").append("<div class='people'>" + this.l_name + "</div><div class='people'>" + this.f_name + "</div><div class='people'>" + this.sequence + "</div><br />");_x000D_
});_x000D_
}
_x000D_
body {_x000D_
font-family: Arial;_x000D_
}_x000D_
.people {_x000D_
display: inline-block;_x000D_
width: 100px;_x000D_
border: 1px dotted black;_x000D_
padding: 5px;_x000D_
margin: 5px;_x000D_
}_x000D_
.buttons {_x000D_
border: 1px solid black;_x000D_
padding: 5px;_x000D_
margin: 5px;_x000D_
float: left;_x000D_
width: 20%;_x000D_
}_x000D_
ul {_x000D_
margin: 5px 0px;_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<div class="buttons" style="background-color: rgba(240, 255, 189, 1);">_x000D_
Sort the JSON array <strong style="color: red;">with</strong> toLowerCase:_x000D_
<ul>_x000D_
<li>Type: string</li>_x000D_
<li>Property: lastname</li>_x000D_
</ul>_x000D_
<button onclick="sortJsonString(); return false;">Sort JSON</button>_x000D_
Asc Sort_x000D_
<input id="chkAscString" type="checkbox" checked="checked" />_x000D_
</div>_x000D_
<div class="buttons" style="background-color: rgba(255, 214, 215, 1);">_x000D_
Sort the JSON array <strong style="color: red;">without</strong> toLowerCase:_x000D_
<ul>_x000D_
<li>Type: string</li>_x000D_
<li>Property: lastname</li>_x000D_
</ul>_x000D_
<button onclick="sortJsonUL(); return false;">Sort JSON</button>_x000D_
Asc Sort_x000D_
<input id="chkAsc" type="checkbox" checked="checked" />_x000D_
</div>_x000D_
<div class="buttons" style="background-color: rgba(240, 255, 189, 1);">_x000D_
Sort the JSON array:_x000D_
<ul>_x000D_
<li>Type: int</li>_x000D_
<li>Property: sequence</li>_x000D_
</ul>_x000D_
<button onclick="sortJsonInt(); return false;">Sort JSON</button>_x000D_
Asc Sort_x000D_
<input id="chkAscInt" type="checkbox" checked="checked" />_x000D_
</div>_x000D_
<br />_x000D_
<br />_x000D_
<div id="data" style="float: left; border: 1px solid black; width: 60%; margin: 5px;">Data</div>
_x000D_
one liner bash function validation
myFunction() {
: ${1?"forgot to supply an argument"}
if [ "$1" -gt "-1" ]; then
echo hi
fi
}
add function name and usage
myFunction() {
: ${1?"forgot to supply an argument ${FUNCNAME[0]}() Usage: ${FUNCNAME[0]} some_integer"}
if [ "$1" -gt "-1" ]; then
echo hi
fi
}
add validation to check if integer
to add additional validation, for example to check to see if the argument passed is an integer, modify the validation one liner to call a validation function:
: ${1?"forgot to supply an argument ${FUNCNAME[0]}() Usage: ${FUNCNAME[0]} some_integer"} && validateIntegers $1 || die "Must supply an integer!"
then, construct a validation function that validates the argument, returning 0 on success, 1 on failure and a die function that aborts script on failure
validateIntegers() {
if ! [[ "$1" =~ ^[0-9]+$ ]]; then
return 1 # failure
fi
return 0 #success
}
die() { echo "$*" 1>&2 ; exit 1; }
Even simpler - just use set -u
set -u
makes sure that every referenced variable is set when its used, so just set it and forget it
myFunction() {
set -u
if [ "$1" -gt "-1" ]; then
echo hi
fi
}
COMMAND: python --version && python3 --version
OUTPUT:
Python 2.7.10
Python 3.7.1
ALIAS COMMAND: pyver
OUTPUT:
Python 2.7.10
Python 3.7.1
You can make an alias like "pyver" in your .bashrc file or else using a text accelerator like AText maybe.
maybe you can try this way
SELECT *
FROM Product P
WHERE (CASE
WHEN @Status = 'published' THEN
(CASE
WHEN P.Status IN (1, 3) THEN
'TRUE'
ELSE
FALSE
END)
WHEN @Status = 'standby' THEN
(CASE
WHEN P.Status IN (2, 5, 9, 6) THEN
'TRUE'
ELSE
'FALSE'
END)
WHEN @Status = 'deleted' THEN
(CASE
WHEN P.Status IN (4, 5, 8, 10) THEN
'TRUE'
ELSE
'FALSE'
END)
ELSE
(CASE
WHEN P.Status IN (1, 3) THEN
'TRUE'
ELSE
'FALSE'
END)
END) = 'TRUE'
In this way if @Status = 'published', the query will check if P.Status is among 1 or 3, it will return TRUE else 'FALSE'. This will be matched with TRUE at the end
Hope it helps.
Example for you to work from
HTML:
<input type="text" value="This is some text" id="text" style="width: 150px;" />
<br />
<input type="button" value="Click Me" id="button" />?
jQuery:
<script type="text/javascript">
$(function () {
$('#button').on('click', function () {
var text = $('#text');
text.val(text.val() + ' after clicking');
});
});
<script>
Javascript
<script type="text/javascript">
document.getElementById("button").addEventListener('click', function () {
var text = document.getElementById('text');
text.value += ' after clicking';
});
</script>
Working jQuery example: http://jsfiddle.net/geMtZ/ ?
@Test
public void testSearchManagementStaff() throws SQLException
{
boolean res=true;
ManagementDaoImp mdi=new ManagementDaoImp();
boolean b=mdi.searchManagementStaff("[email protected]"," 123456");
assertEquals(res,b);
}
Are you using JavaScript or jQuery besides the html? If you are, you can do something like:
HTML:
<select id='some_selector'></select>?
jQuery:
var select = '';
for (i=1;i<=100;i++){
select += '<option val=' + i + '>' + i + '</option>';
}
$('#some_selector').html(select);
As you can see here.
Another option for compatible browsers instead of select, you can use is HTML5's input type=number
:
<input type="number" min="1" max="100" value="1">
The only other way I can think of to do it is to enclose each of the rows you need a border around in a nested table. That will make the border easier to do but will potentially creat other layout issues, you'll have to manually set the width on table cells etc.
Your approach may well be the best one depending on your other layout rerquirements and the suggested approach here is just a possible alternative.
<table cellspacing="0">
<tr>
<td>no border</td>
<td>no border here either</td>
</tr>
<tr>
<td>
<table style="border: thin solid black">
<tr>
<td>one</td>
<td>two</td>
</tr>
<tr>
<td>three</td>
<td>four</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="2">once again no borders</td>
</tr>
<tr>
<td>
<table style="border: thin solid black">
<tr>
<td>hello</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="2">world</td>
</tr>
</table>
you can use arraylist object from collections class
using System.Collections;
static void Main()
{
ArrayList arr = new ArrayList();
}
when you want to add elements you can use
arr.Add();
I had a requirement to provide a report showing details by month where the date field was formatted as date & time, I simply changed the formatting of the date column to "General" and then used the following formula in a new column,
=CONCATENATE(YEAR(C2),MONTH(C2))
Behavior differences
Some differences on Bash 4.3.11:
POSIX vs Bash extension:
[
is POSIX[[
is a Bash extension inspired from Korn shellregular command vs magic
[
is just a regular command with a weird name.
]
is just the last argument of [
.
Ubuntu 16.04 actually has an executable for it at /usr/bin/[
provided by coreutils, but the bash built-in version takes precedence.
Nothing is altered in the way that Bash parses the command.
In particular, <
is redirection, &&
and ||
concatenate multiple commands, ( )
generates subshells unless escaped by \
, and word expansion happens as usual.
[[ X ]]
is a single construct that makes X
be parsed magically. <
, &&
, ||
and ()
are treated specially, and word splitting rules are different.
There are also further differences like =
and =~
.
In Bashese: [
is a built-in command, and [[
is a keyword: https://askubuntu.com/questions/445749/whats-the-difference-between-shell-builtin-and-shell-keyword
<
[[ a < b ]]
: lexicographical comparison[ a \< b ]
: Same as above. \
required or else does redirection like for any other command. Bash extension.expr x"$x" \< x"$y" > /dev/null
or [ "$(expr x"$x" \< x"$y")" = 1 ]
: POSIX equivalents, see: How to test strings for lexicographic less than or equal in Bash?&&
and ||
[[ a = a && b = b ]]
: true, logical and[ a = a && b = b ]
: syntax error, &&
parsed as an AND command separator cmd1 && cmd2
[ a = a ] && [ b = b ]
: POSIX reliable equivalent[ a = a -a b = b ]
: almost equivalent, but deprecated by POSIX because it is insane and fails for some values of a
or b
like !
or (
which would be interpreted as logical operations(
[[ (a = a || a = b) && a = b ]]
: false. Without ( )
, would be true because [[ && ]]
has greater precedence than [[ || ]]
[ ( a = a ) ]
: syntax error, ()
is interpreted as a subshell[ \( a = a -o a = b \) -a a = b ]
: equivalent, but ()
, -a
, and -o
are deprecated by POSIX. Without \( \)
would be true because -a
has greater precedence than -o
{ [ a = a ] || [ a = b ]; } && [ a = b ]
non-deprecated POSIX equivalent. In this particular case however, we could have written just: [ a = a ] || [ a = b ] && [ a = b ]
because the ||
and &&
shell operators have equal precedence unlike [[ || ]]
and [[ && ]]
and -o
, -a
and [
word splitting and filename generation upon expansions (split+glob)
x='a b'; [[ $x = 'a b' ]]
: true, quotes not neededx='a b'; [ $x = 'a b' ]
: syntax error, expands to [ a b = 'a b' ]
x='*'; [ $x = 'a b' ]
: syntax error if there's more than one file in the current directory.x='a b'; [ "$x" = 'a b' ]
: POSIX equivalent=
[[ ab = a? ]]
: true, because it does pattern matching (* ? [
are magic). Does not glob expand to files in current directory.[ ab = a? ]
: a?
glob expands. So may be true or false depending on the files in the current directory.[ ab = a\? ]
: false, not glob expansion=
and ==
are the same in both [
and [[
, but ==
is a Bash extension.case ab in (a?) echo match; esac
: POSIX equivalent[[ ab =~ 'ab?' ]]
: false, loses magic with ''
in Bash 3.2 and above and provided compatibility to bash 3.1 is not enabled (like with BASH_COMPAT=3.1
)[[ ab? =~ 'ab?' ]]
: true=~
[[ ab =~ ab? ]]
: true, POSIX extended regular expression match, ?
does not glob expand[ a =~ a ]
: syntax error. No bash equivalent.printf 'ab\n' | grep -Eq 'ab?'
: POSIX equivalent (single line data only)awk 'BEGIN{exit !(ARGV[1] ~ ARGV[2])}' ab 'ab?'
: POSIX equivalent.Recommendation: always use []
There are POSIX equivalents for every [[ ]]
construct I've seen.
If you use [[ ]]
you:
[
is just a regular command with a weird name, no special semantics are involved.Thanks to Stéphane Chazelas for important corrections and additions.
Here is a simple solution that works for me.
public static bool numResult;
public static bool checkTextisNumber(string numberVal)
{
try
{
if (numberVal.Equals("."))
{
numResult = true;
}
else if (numberVal.Equals(""))
{
numResult = true;
}
else
{
decimal number3 = 0;
bool canConvert = decimal.TryParse(numberVal, out number3);
if (canConvert == true)
{
numResult = true;
}
else
numResult = false;
}
}
catch (System.Exception ex)
{
numResult = false;
}
return numResult;
}
string correctNum;
private void tBox_NumTester_TextChanged(object sender, TextChangedEventArgs e)
{
if(checkTextisNumber(tBox_NumTester.Text))
{
correctNum = tBox_NumTester.Text;
}
else
{
tBox_NumTester.Text = correctNum;
}
}
When the result is success but you get the "<" character, it means that some PHP error is returned.
If you want to see all message, you could get the result as a success response getting by the following:
success: function(response){
var out = "";
for(var i = 0; i < response.length; i++) {
out += response[i];
}
alert(out) ;
},
This works great when you want to load a series from a csv file
x = pd.read_csv('x.csv', index_col=False, names=['x'],header=None).iloc[:,0]
print(type(x))
print(x.head(10))
<class 'pandas.core.series.Series'>
0 110.96
1 119.40
2 135.89
3 152.32
4 192.91
5 177.20
6 181.16
7 177.30
8 200.13
9 235.41
Name: x, dtype: float64
If you're training for cross entropy, you want to add a small number like 1e-8 to your output probability.
Because log(0) is negative infinity, when your model trained enough the output distribution will be very skewed, for instance say I'm doing a 4 class output, in the beginning my probability looks like
0.25 0.25 0.25 0.25
but toward the end the probability will probably look like
1.0 0 0 0
And you take a cross entropy of this distribution everything will explode. The fix is to artifitially add a small number to all the terms to prevent this.
Use floats to float the image, the text should wrap beside
For Mapping Composite primary key using Entity framework we can use two approaches.
1) By Overriding the OnModelCreating() Method
For ex: I have the model class named VehicleFeature as shown below.
public class VehicleFeature
{
public int VehicleId { get; set; }
public int FeatureId{get;set;}
public Vehicle Vehicle{get;set;}
public Feature Feature{get;set;}
}
The Code in my DBContext would be like ,
public class VegaDbContext : DbContext
{
public DbSet<Make> Makes{get;set;}
public DbSet<Feature> Features{get;set;}
public VegaDbContext(DbContextOptions<VegaDbContext> options):base(options)
{
}
// we override the OnModelCreating method here.
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<VehicleFeature>().HasKey(vf=> new {vf.VehicleId, vf.FeatureId});
}
}
2) By Data Annotations.
public class VehicleFeature
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
[Key]
public int VehicleId { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
[Key]
public int FeatureId{get;set;}
public Vehicle Vehicle{get;set;}
public Feature Feature{get;set;}
}
Please refer the below links for the more information.
1) https://msdn.microsoft.com/en-us/library/jj591617(v=vs.113).aspx
It is called the Card Security Code (CSC) according to Wikipedia, but has also been known as other things, such as the Card Verification Value (CVV) or Card Verfication Code (CVC).
The second code, and the most cited, is CVV2 or CVC2. This CSC (also known as a CCID or Credit Card ID) is often asked for by merchants for them to secure "card not present" transactions occurring over the Internet, by mail, fax or over the phone. In many countries in Western Europe, due to increased attempts at card fraud, it is now mandatory to provide this code when the cardholder is not present in person.
Because this seems to be known by multiple names, and its name doesn't seem to be printed on the card itself, you'll probably (unfortunately) still need to tell your users how to find the code - ie by describing it as the "3 digit code on back of card".
2018 update
The situation has not improved, and is now worse - there are even more different names now. However, you can if you like use different terms depending on the card type:
Note that some American Express and Discover cards use a 4-digit code on the front of the card. See the above linked Wikipedia article for more.
x <- rnorm(10) * 100000
y <- seq(0, 1, length = 10)
p <- qplot(x, y)
library(scales)
p + scale_x_continuous(labels = comma)
Just to explain:
2011-02-15
is being interpreted literally as a mathematical operation, to which the answer is 1994
.
This, then, is being interpreted as 1994 days since the origin of date (Jan 1st 1900).
1994 days = 5 years, 6 months, 18 days = June 18th 1905
So, if you don't want to to the calculation each time you want compare a date to a particular value use the standard: Compare the value of the toString()
function of date object to the string like this :
set @TEST ='2011-02-05'