python getoutput() equivalent in subprocess

Use subprocess.Popen:

import subprocess
process = subprocess.Popen(['ls', '-a'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = process.communicate()
print(out)

Note that communicate blocks until the process terminates. You could use process.stdout.readline() if you need the output before it terminates. For more information see the documentation.

Git mergetool generates unwanted .orig files

I simply use the command

git clean -n *.orig

check to make sure only file I want remove are listed then

git clean -f *.orig

How to add a margin to a table row <tr>

Here's a neat way I did it:

table tr {
    border-bottom: 4px solid;
}

That will add 4px of vertical spacing between each row. And if you wanted to not get that border on the last child:

table tr:last-child {
    border-bottom: 0;
}

Reminder that CSS3 pseudo-selectors will only work in IE 8 and below with selectivizr.

Add Foreign Key relationship between two Databases

In my experience, the best way to handle this when the primary authoritative source of information for two tables which are related has to be in two separate databases is to sync a copy of the table from the primary location to the secondary location (using T-SQL or SSIS with appropriate error checking - you cannot truncate and repopulate a table while it has a foreign key reference, so there are a few ways to skin the cat on the table updating).

Then add a traditional FK relationship in the second location to the table which is effectively a read-only copy.

You can use a trigger or scheduled job in the primary location to keep the copy updated.

Open button in new window?

If you strictly want to stick to using button,Then simply create an open window function as follows:

    <script>
function myfunction() {
    window.open("mynewpage.html");
}
</script>

Then in your html do the following with your button:

Join

So you would have something like this:

 <body>
    <script>
function joinfunction() {
    window.open("mynewpage.html");
}
</script>
<button  onclick="myfunction()" type="button" class="btn btn-default subs-btn">Join</button>

how to count the spaces in a java string?

\t will match tabs, rather than spaces and should also be referred to with a double slash: \\t. You could call s.split( " " ) but that wouldn't count consecutive spaces. By that I mean...

String bar = " ba jfjf jjj j   ";
String[] split = bar.split( " " );
System.out.println( split.length ); // Returns 5

So, despite the fact there are seven space characters, there are only five blocks of space. It depends which you're trying to count, I guess.

Commons Lang is your friend for this one.

int count = StringUtils.countMatches( inputString, " " );

Getting a timestamp for today at midnight?

Updated Answer in 19 April, 2020

Simply we can do this:

$today = date('Y-m-d 00:00:00');

How to make sql-mode="NO_ENGINE_SUBSTITUTION" permanent in MySQL my.cnf

I am running WHM 10.2.15-MariaDB. To permanently disable strict mode first find out which configuration file our installation prefers. For that, we need the binary’s location:

$ which mysqld
/usr/sbin/mysqld

Then, we use this path to execute the lookup:

$ /usr/sbin/mysqld --verbose --help | grep -A 1 "Default options"

Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf

We can see that the first favored configuration file is one in the root of the etc folder but that there is a second .cnf file hidden - ~/.my.cnf. Adding the following to the ~/.my.cnf file permanently disabled strict mode for me (needs to be within the mysqld section):

[mysqld]
sql_mode=NO_ENGINE_SUBSTITUTION

I found that adding the line to /etc/my.cnf had no effect at all apart from sending me crazy.

"Unable to locate tools.jar" when running ant

Make sure you use the root folder of the JDK. Don't add "\lib" to the end of the path, where tools.jar is physically located. It took me an hour to figure that one out. Also, this post will help show you where Ant is looking for tools.jar:

Why does ANT tell me that JAVA_HOME is wrong when it is not?

Does svn have a `revert-all` command?

You could do:

svn revert -R .

This will not delete any new file not under version control. But you can easily write a shell script to do that like:

for file in `svn status|grep "^ *?"|sed -e 's/^ *? *//'`; do rm $file ; done

How to make a website secured with https

What kind of business data? Trade secrets or just stuff that they don't want people to see but if it got out, it wouldn't be a big deal? If we are talking trade secrets, financial information, customer information and stuff that's generally confidential. Then don't even go down that route.

I'm wondering whether I need to use a secured connection (https) or just the forms authentication is enough.

Use a secure connection all the way.

Do I need to alter the code / Config

Yes. Well may be not. You may want to have an expert do this for you.

Is SSL and https one and the same...

Mostly yes. People usually refer to those things as the same thing.

Do I need to apply with someone to get some license or something.

You probably want to have your certificate signed by a certificate authority. It will cost you or your client a bit of money.

Do I need to make all my pages secured or only the login page...

Use https throughout. Performance is usually not an issue if the site is meant for internal users.

I was searching Internet for answer, but I was not able to get all these points... Any whitepaper or other references would also be helpful...

Start here for some pointers: http://www.owasp.org/index.php/Category:OWASP_Guide_Project

Note that SSL is a minuscule piece of making your web site secure once it is accessible from the internet. It does not prevent most sort of hacking.

Creating a Jenkins environment variable using Groovy

Jenkins 1.x

The following groovy snippet should pass the version (as you've already supplied), and store it in the job's variables as 'miniVersion'.

import hudson.model.*

def env = System.getenv()
def version = env['currentversion']
def m = version =~/\d{1,2}/
def minVerVal = m[0]+"."+m[1]

def pa = new ParametersAction([
  new StringParameterValue("miniVersion", minVerVal)
])

// add variable to current job
Thread.currentThread().executable.addAction(pa)

The variable will then be accessible from other build steps. e.g.

echo miniVersion=%miniVersion%

Outputs:

miniVersion=12.34

I believe you'll need to use the "System Groovy Script" (on the Master node only) as opposed to the "Groovy Plugin" - https://wiki.jenkins-ci.org/display/JENKINS/Groovy+plugin#Groovyplugin-GroovyScriptvsSystemGroovyScript

Jenkins 2.x

I believe the previous (Jenkins 1.x) behaviour stopped working because of this Security Advisory...

Solution (paraphrased from the Security Advisory)

It's possible to restore the previous behaviour by setting the system property hudson.model.ParametersAction.keepUndefinedParameters to true. This is potentially very unsafe and intended as a short-term workaround only.

java -Dhudson.model.ParametersAction.keepUndefinedParameters=true -jar jenkins.war

To allow specific, known safe parameter names to be passed to builds, set the system property hudson.model.ParametersAction.safeParameters to a comma-separated list of safe parameter names.

e.g.

java -Dhudson.model.ParametersAction.safeParameters=miniVersion,FOO,BAR -jar jenkins.war

How to sort a list of strings numerically?

You haven't actually converted your strings to ints. Or rather, you did, but then you didn't do anything with the results. What you want is:

list1 = ["1","10","3","22","23","4","2","200"]
list1 = [int(x) for x in list1]
list1.sort()

If for some reason you need to keep strings instead of ints (usually a bad idea, but maybe you need to preserve leading zeros or something), you can use a key function. sort takes a named parameter, key, which is a function that is called on each element before it is compared. The key function's return values are compared instead of comparing the list elements directly:

list1 = ["1","10","3","22","23","4","2","200"]
# call int(x) on each element before comparing it
list1.sort(key=int)

Calling another method java GUI

I'm not sure what you're trying to do, but here's something to consider: c(); won't do anything. c is an instance of the class checkbox and not a method to be called. So consider this:

public class FirstWindow extends JFrame {      public FirstWindow() {         checkbox c = new checkbox();         c.yourMethod(yourParameters); // call the method you made in checkbox     } }  public class checkbox extends JFrame {      public checkbox(yourParameters) {          // this is the constructor method used to initialize instance variables     }      public void yourMethod() // doesn't have to be void     {         // put your code here     } }

How To: Best way to draw table in console app (C#)

public static void ToPrintConsole(this DataTable dataTable)
    {
        // Print top line
        Console.WriteLine(new string('-', 75));

        // Print col headers
        var colHeaders = dataTable.Columns.Cast<DataColumn>().Select(arg => arg.ColumnName);
        foreach (String s in colHeaders)
        {
            Console.Write("| {0,-20}", s);
        }
        Console.WriteLine();

        // Print line below col headers
        Console.WriteLine(new string('-', 75));

        // Print rows
        foreach (DataRow row in dataTable.Rows)
        {
            foreach (Object o in row.ItemArray)
            {
                Console.Write("| {0,-20}", o.ToString());
            }
            Console.WriteLine();
        }

        // Print bottom line
        Console.WriteLine(new string('-', 75));
    }

Visual Studio Community 2015 expiration date

I also get same issue after I repair vs2015, even I click check license online, still fail. Correct action is: 1. Sign out 2. Check License Status, then it will pop-up login window, after login then it able to successfully get the license info.

How to run a script at a certain time on Linux?

The at command exists specifically for this purpose (unlike cron which is intended for scheduling recurring tasks).

at $(cat file) </path/to/script

Twig: in_array or similar possible within if statement?

You just have to change the second line of your second code-block from

{% if myVar is in_array(array_keys(someOtherArray)) %}

{% if myVar in someOtherArray|keys %}

in is the containment-operator and keys a filter that returns an arrays keys.

How can I get nth element from a list?

I know it's an old post ... but it may be useful for someone ... in a "functional" way ...

import Data.List

safeIndex :: [a] -> Int -> Maybe a
safeIndex xs i 
        | (i> -1) && (length xs > i) = Just (xs!!i)
        | otherwise = Nothing

How to deal with http status codes other than 200 in Angular 2

Include required imports and you can make ur decision in handleError method Error status will give the error code

import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import {Observable, throwError} from "rxjs/index";
import { catchError, retry } from 'rxjs/operators';
import {ApiResponse} from "../model/api.response";
import { TaxType } from '../model/taxtype.model'; 

private handleError(error: HttpErrorResponse) {
if (error.error instanceof ErrorEvent) {
  // A client-side or network error occurred. Handle it accordingly.
  console.error('An error occurred:', error.error.message);
} else {
  // The backend returned an unsuccessful response code.
  // The response body may contain clues as to what went wrong,
  console.error(
    `Backend returned code ${error.status}, ` +
    `body was: ${error.error}`);
}
// return an observable with a user-facing error message
return throwError(
  'Something bad happened; please try again later.');
  };

  getTaxTypes() : Observable<ApiResponse> {
return this.http.get<ApiResponse>(this.baseUrl).pipe(
  catchError(this.handleError)
);
  }

How to increase maximum execution time in php

Use the PHP function

void set_time_limit ( int $seconds )

The maximum execution time, in seconds. If set to zero, no time limit is imposed.

This function has no effect when PHP is running in safe mode. There is no workaround other than turning off safe mode or changing the time limit in the php.ini.

How to remove the first and the last character of a string

It may be nicer one to use slice like :

string.slice(1, -1)

BAT file: Open new cmd window and execute a command in there

You may already find your answer because it was some time ago you asked. But I tried to do something similar when coding ror. I wanted to run "rails server" in a new cmd window so I don't have to open a new cmd and then find my path again.

What I found out was to use the K switch like this:

start cmd /k echo Hello, World!

start before "cmd" will open the application in a new window and "/K" will execute "echo Hello, World!" after the new cmd is up.

You can also use the /C switch for something similar.

start cmd /C pause

This will then execute "pause" but close the window when the command is done. In this case after you pressed a button. I found this useful for "rails server", then when I shutdown my dev server I don't have to close the window after.

Use the following in your batch file:

start cmd.exe /c "more-batch-commands-here"

start cmd.exe /k "more-batch-commands-here"

/c Carries out the command specified by string and then terminates

/k Carries out the command specified by string but remains

The /c and /k options controls what happens once your command finishes running. With /c the terminal window will close automatically, leaving your desktop clean. With /k the terminal window will remain open. It's a good option if you want to run more commands manually afterwards.

Consult the cmd.exe documentation using cmd /? for more details.

Escaping Commands with White Spaces

The proper formatting of the command string becomes more complicated when using arguments with spaces. See the examples below. Note the nested double quotes in some examples.

Examples:

Run a program and pass a filename parameter:
CMD /c write.exe c:\docs\sample.txt

Run a program and pass a filename which contains whitespace:
CMD /c write.exe "c:\sample documents\sample.txt"

Spaces in program path:
CMD /c ""c:\Program Files\Microsoft Office\Office\Winword.exe""

Spaces in program path + parameters:
CMD /c ""c:\Program Files\demo.cmd"" Parameter1 Param2
CMD /k ""c:\batch files\demo.cmd" "Parameter 1 with space" "Parameter2 with space""

Launch demo1 and demo2:
CMD /c ""c:\Program Files\demo1.cmd" & "c:\Program Files\demo2.cmd""

Source: http://ss64.com/nt/cmd.html

How to watch and compile all TypeScript sources?

Look into using grunt to automate this, there are numerous tutorials around, but here's a quick start.

For a folder structure like:

blah/
blah/one.ts
blah/two.ts
blah/example/
blah/example/example.ts
blah/example/package.json
blah/example/Gruntfile.js
blah/example/index.html

You can watch and work with typescript easily from the example folder with:

npm install
grunt

With package.json:

{
  "name": "PROJECT",
  "version": "0.0.1",
  "author": "",
  "description": "",
  "homepage": "",
  "private": true,
  "devDependencies": {
    "typescript": "~0.9.5",
    "connect": "~2.12.0",
    "grunt-ts": "~1.6.4",
    "grunt-contrib-watch": "~0.5.3",
    "grunt-contrib-connect": "~0.6.0",
    "grunt-open": "~0.2.3"
  }
}

And a grunt file:

module.exports = function (grunt) {

  // Import dependencies
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-contrib-connect');
  grunt.loadNpmTasks('grunt-open');
  grunt.loadNpmTasks('grunt-ts');

  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    connect: {
      server: {  // <--- Run a local server on :8089
        options: {
          port: 8089,
          base: './'
        }
      }
    },
    ts: {
      lib: { // <-- compile all the files in ../ to PROJECT.js
        src: ['../*.ts'],
        out: 'PROJECT.js',
        options: {
          target: 'es3',
          sourceMaps: false,
          declaration: true,
          removeComments: false
        }
      },
      example: {  // <--- compile all the files in . to example.js
        src: ['*.ts'],
        out: 'example.js',
        options: {
          target: 'es3',
          sourceMaps: false,
          declaration: false,
          removeComments: false
        }
      }
    },
    watch: { 
      lib: { // <-- Watch for changes on the library and rebuild both
        files: '../*.ts',
        tasks: ['ts:lib', 'ts:example']
      },
      example: { // <--- Watch for change on example and rebuild
        files: ['*.ts', '!*.d.ts'],
        tasks: ['ts:example']
      }
    },
    open: { // <--- Launch index.html in browser when you run grunt
      dev: {
        path: 'http://localhost:8089/index.html'
      }
    }
  });

  // Register the default tasks to run when you run grunt
  grunt.registerTask('default', ['ts', 'connect', 'open', 'watch']);
}

How can I emulate a get request exactly like a web browser?

Are you sure the curl module honors ini_set('user_agent',...)? There is an option CURLOPT_USERAGENT described at http://docs.php.net/function.curl-setopt.
Could there also be a cookie tested by the server? That you can handle by using CURLOPT_COOKIE, CURLOPT_COOKIEFILE and/or CURLOPT_COOKIEJAR.

edit: Since the request uses https there might also be error in verifying the certificate, see CURLOPT_SSL_VERIFYPEER.

$url="https://new.aol.com/productsweb/subflows/ScreenNameFlow/AjaxSNAction.do?s=username&f=firstname&l=lastname";
$agent= 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)';

$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt($ch, CURLOPT_URL,$url);
$result=curl_exec($ch);
var_dump($result);

What does 'const static' mean in C and C++?

In C++,

static const int foo = 42;

is the preferred way to define & use constants. I.e. use this rather than

#define foo 42

because it doesn't subvert the type-safety system.

ModuleNotFoundError: No module named 'sklearn'

The other name of sklearn in anaconda is scikit-learn. simply open your anaconda navigator, go to the environments, select your environment, for example tensorflow or whatever you want to work with, search for scikit_learn in the list of uninstalled packages, apply it and then you can import sklearn in your jupyter.

How to install iPhone application in iPhone Simulator

Please note: this answer is obsolete, the functionality was removed from iOS simulator.

I have just found that you don't need to copy the mobile application bundle to the iPhone Simulator's folder to start it on the simulator, as described in the forum. That way you need to click on the app to get it started, not confortable when you want to do testing and start the app numerous times.

There are undocumented command line parameters for the iOS Simulator, which can be used for such purposes. The one you are looking for is: -SimulateApplication

An example command line starting up YourFavouriteApp:

/Developer/Platforms/iPhoneSimulator.platform/Developer/Applications/iPhone\ Simulator.app/Contents/MacOS/iPhone\ Simulator -SimulateApplication path_to_your_app/YourFavouriteApp.app/YourFavouriteApp

This will start up your application without any installation and works with iOS Simulator 4.2 at least. You cannot reach the home menu, though.

There are other unpublished command line parameters, like switching the SDK. Happy hunting for those...

jquery to change style attribute of a div class

Try with

$('.handle').css({'left': '300px'});

Instead of

$('.handle').css({'style':'left: 300px'})

I can't access http://localhost/phpmyadmin/

Or it could be that Skype is running on the same port (it does by default).

Disable Skype or configure Skype to use another port

Easy way to build Android UI?

Not saying this is the best way to go, but its good to have options. Necessitas is a project that ports Qt to android. It is still in its early stages and lacking full features, but for those who know Qt and don't wanna bother with the terrible lack of good tools for Android UI would be wise to at least consider using this.

Callback function for JSONP with jQuery AJAX

This is what I do on mine

$(document).ready(function() {
  if ($('#userForm').valid()) {
    var formData = $("#userForm").serializeArray();
    $.ajax({
      url: 'http://www.example.com/user/' + $('#Id').val() + '?callback=?',
      type: "GET",
      data: formData,
      dataType: "jsonp",
      jsonpCallback: "localJsonpCallback"
    });
  });

function localJsonpCallback(json) {
  if (!json.Error) {
    $('#resultForm').submit();
  } else {
    $('#loading').hide();
    $('#userForm').show();
    alert(json.Message);
  }
}

Bootstrap 4 align navbar items to the right

In bootstrap v4.3 just add ml-auto in <ul class="navbar-nav"> Ex:<ul class="navbar-nav ml-auto">

Filter Pyspark dataframe column with None value

You can use Column.isNull / Column.isNotNull:

df.where(col("dt_mvmt").isNull())

df.where(col("dt_mvmt").isNotNull())

If you want to simply drop NULL values you can use na.drop with subset argument:

df.na.drop(subset=["dt_mvmt"])

Equality based comparisons with NULL won't work because in SQL NULL is undefined so any attempt to compare it with another value returns NULL:

sqlContext.sql("SELECT NULL = NULL").show()
## +-------------+
## |(NULL = NULL)|
## +-------------+
## |         null|
## +-------------+


sqlContext.sql("SELECT NULL != NULL").show()
## +-------------------+
## |(NOT (NULL = NULL))|
## +-------------------+
## |               null|
## +-------------------+

The only valid method to compare value with NULL is IS / IS NOT which are equivalent to the isNull / isNotNull method calls.

JavaScript and Threads

If you can't or don't want to use any AJAX stuff, use an iframe or ten! ;) You can have processes running in iframes in parallel with the master page without worrying about cross browser comparable issues or syntax issues with dot net AJAX etc, and you can call the master page's JavaScript (including the JavaScript that it has imported) from an iframe.

E.g, in a parent iframe, to call egFunction() in the parent document once the iframe content has loaded (that's the asynchronous part)

parent.egFunction();

Dynamically generate the iframes too so the main html code is free from them if you want.

Relative div height

add this to you CSS:

html, body
{
    height: 100%;
}

working Fiddle

when you say to wrap to be 100%, 100% of what? of its parent (body), so his parent has to have some height.

and the same goes for body, his parent his html. html parent his the viewport.. so, by setting them both to 100%, wrap can also have a percentage height.

also: the elements have some default padding/margin, that causes them to span a little more then the height you applied to them. (causing a scroll bar) you can use

*
{
    padding: 0;
    margin: 0;
}

to disable that.

Look at That Fiddle

How to cache Google map tiles for offline usage?

On Android platforms, Oruxmaps (http://www.oruxmaps.com) does a great job at caching all WMS sources. It is available in the play store. I use it daily in remote areas without any connectivity, works like a charm.

How does a PreparedStatement avoid or prevent SQL injection?

The problem with SQL injection is, that a user input is used as part of the SQL statement. By using prepared statements you can force the user input to be handled as the content of a parameter (and not as a part of the SQL command).

But if you don't use the user input as a parameter for your prepared statement but instead build your SQL command by joining strings together, you are still vulnerable to SQL injections even when using prepared statements.

How to execute Table valued function

A TVF (table-valued function) is supposed to be SELECTed FROM. Try this:

select * from FN('myFunc')

Gradients on UIView and UILabels On iPhone

You can use Core Graphics to draw the gradient, as pointed to in Mike's response. As a more detailed example, you could create a UIView subclass to use as a background for your UILabel. In that UIView subclass, override the drawRect: method and insert code similar to the following:

- (void)drawRect:(CGRect)rect 
{
    CGContextRef currentContext = UIGraphicsGetCurrentContext();

    CGGradientRef glossGradient;
    CGColorSpaceRef rgbColorspace;
    size_t num_locations = 2;
    CGFloat locations[2] = { 0.0, 1.0 };
    CGFloat components[8] = { 1.0, 1.0, 1.0, 0.35,  // Start color
         1.0, 1.0, 1.0, 0.06 }; // End color

    rgbColorspace = CGColorSpaceCreateDeviceRGB();
    glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations);

    CGRect currentBounds = self.bounds;
    CGPoint topCenter = CGPointMake(CGRectGetMidX(currentBounds), 0.0f);
    CGPoint midCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMidY(currentBounds));
    CGContextDrawLinearGradient(currentContext, glossGradient, topCenter, midCenter, 0);

    CGGradientRelease(glossGradient);
    CGColorSpaceRelease(rgbColorspace); 
}

This particular example creates a white, glossy-style gradient that is drawn from the top of the UIView to its vertical center. You can set the UIView's backgroundColor to whatever you like and this gloss will be drawn on top of that color. You can also draw a radial gradient using the CGContextDrawRadialGradient function.

You just need to size this UIView appropriately and add your UILabel as a subview of it to get the effect you desire.

EDIT (4/23/2009): Per St3fan's suggestion, I have replaced the view's frame with its bounds in the code. This corrects for the case when the view's origin is not (0,0).

Add "Are you sure?" to my excel button, how can I?

Just make a custom userform that is shown when the "delete" button is pressed, then link the continue button to the actual code that does the deleting. Make the cancel button hide the userform.

onClick not working on mobile (touch)

better to use touchstart event with .on() jQuery method:

$(window).load(function() { // better to use $(document).ready(function(){
    $('.List li').on('click touchstart', function() {
        $('.Div').slideDown('500');
    });
});

And i don't understand why you are using $(window).load() method because it waits for everything on a page to be loaded, this tend to be slow, while you can use $(document).ready() method which does not wait for each element on the page to be loaded first.

The relationship could not be changed because one or more of the foreign-key properties is non-nullable

I've no idea why the other two answers are so popular!

I believe you were right in assuming the ORM framework should handle it - after all, that is what it promises to deliver. Otherwise your domain model gets corrupted by persistence concerns. NHibernate manages this happily if you setup the cascade settings correctly. In Entity Framework it is also possible, they just expect you to follow better standards when setting up your database model, especially when they have to infer what cascading should be done:

You have to define the parent - child relationship correctly by using an "identifying relationship".

If you do this, Entity Framework knows the child object is identified by the parent, and therefore it must be a "cascade-delete-orphans" situation.

Other than the above, you might need to (from NHibernate experience)

thisParent.ChildItems.Clear();
thisParent.ChildItems.AddRange(modifiedParent.ChildItems);

instead of replacing the list entirely.

UPDATE

@Slauma's comment reminded me that detached entities are another part of the overall problem. To solve that, you can take the approach of using a custom model binder that constructs your models by attempting to load it from the context. This blog post shows an example of what I mean.

AngularJS ng-click stopPropagation

ngClick directive (as well as all other event directives) creates $event variable which is available on same scope. This variable is a reference to JS event object and can be used to call stopPropagation():

<table>
  <tr ng-repeat="user in users" ng-click="showUser(user)">
    <td>{{user.firstname}}</td>
    <td>{{user.lastname}}</td>
    <td>
      <button class="btn" ng-click="deleteUser(user.id, $index); $event.stopPropagation();">
        Delete
      </button>
    </td>              
  </tr>
</table>

PLUNKER

sys.stdin.readline() reads without prompt, returning 'nothing in between'

If you need just one character and you don't want to keep things in the buffer, you can simply read a whole line and drop everything that isn't needed.

Replace:

stdin.read(1)

with

stdin.readline().strip()[:1]

This will read a line, remove spaces and newlines and just keep the first character.

Efficient way to remove ALL whitespace from String?

Here is yet another variant:

public static string RemoveAllWhitespace(string aString)
{
  return String.Join(String.Empty, aString.Where(aChar => aChar !Char.IsWhiteSpace(aChar)));
}

As with most of the other solutions, I haven't performed exhaustive benchmark tests, but this works well enough for my purposes.

How to change TextBox's Background color?

in web application in .cs page

   txtbox.Style.Add("background-color","black");

in css specify it by using backcolor property

Change Background color (css property) using Jquery

Try this

$("body").css({"background-color":"blue"});

Select from table by knowing only date without time (ORACLE)

Personally, I usually go with:

select * 
from   t1
where  date between trunc( :somedate )          -- 00:00:00
            and     trunc( :somedate ) + .99999 -- 23:59:59

JS Client-Side Exif Orientation: Rotate and Mirror JPEG Images

Mederr's context transform works perfectly. If you need to extract orientation only use this function - you don't need any EXIF-reading libs. Below is a function for re-setting orientation in base64 image. Here's a fiddle for it. I've also prepared a fiddle with orientation extraction demo.

function resetOrientation(srcBase64, srcOrientation, callback) {
  var img = new Image();    

  img.onload = function() {
    var width = img.width,
        height = img.height,
        canvas = document.createElement('canvas'),
        ctx = canvas.getContext("2d");

    // set proper canvas dimensions before transform & export
    if (4 < srcOrientation && srcOrientation < 9) {
      canvas.width = height;
      canvas.height = width;
    } else {
      canvas.width = width;
      canvas.height = height;
    }

    // transform context before drawing image
    switch (srcOrientation) {
      case 2: ctx.transform(-1, 0, 0, 1, width, 0); break;
      case 3: ctx.transform(-1, 0, 0, -1, width, height); break;
      case 4: ctx.transform(1, 0, 0, -1, 0, height); break;
      case 5: ctx.transform(0, 1, 1, 0, 0, 0); break;
      case 6: ctx.transform(0, 1, -1, 0, height, 0); break;
      case 7: ctx.transform(0, -1, -1, 0, height, width); break;
      case 8: ctx.transform(0, -1, 1, 0, 0, width); break;
      default: break;
    }

    // draw image
    ctx.drawImage(img, 0, 0);

    // export base64
    callback(canvas.toDataURL());
  };

  img.src = srcBase64;
};

How to find the unclosed div tag

As stated already, running your code through the W3C Validator is great but if your page is complex, you still may not know exactly where to find the open div.

I like using tabs to indent my code. It keeps it visually organized so that these issues are easier to find, children, siblings, parents, etc... they'll appear more obvious.

EDIT: Also, I'll use a few HTML comments to mark closing tags in the complex areas. I keep these to a minimum for neatness.

<body>

    <div>
        Main Content

        <div>
            Div #1 content

            <div>
               Child of div #1

               <div>
                   Child of child of div #1
               </div><!--// close of child of child of div #1 //-->
            </div><!--// close of child of div #1 //-->
        </div><!--// close of div #1 //-->

        <div>
            Div #2 content
        </div>

        <div>
            Div #3 content
        </div>

    </div><!--// close of Main Content div //-->

</body>

Change a Nullable column to NOT NULL with Default Value

I think you will need to do this as three separate statements. I've been looking around and everything i've seen seems to suggest you can do it if you are adding a column, but not if you are altering one.

ALTER TABLE dbo.MyTable
ADD CONSTRAINT my_Con DEFAULT GETDATE() for created

UPDATE MyTable SET Created = GetDate() where Created IS NULL

ALTER TABLE dbo.MyTable 
ALTER COLUMN Created DATETIME NOT NULL

How do I get the current year using SQL on Oracle?

Another option is:

SELECT *
  FROM TABLE
 WHERE EXTRACT( YEAR FROM date_field) = EXTRACT(YEAR FROM sysdate)

Is there an XSL "contains" directive?

Sure there is! For instance:

<xsl:if test="not(contains($hhref, '1234'))">
  <li>
    <a href="{$hhref}" title="{$pdate}">
      <xsl:value-of select="title"/>
    </a>
  </li>
</xsl:if>

The syntax is: contains(stringToSearchWithin, stringToSearchFor)

Printing to the console in Google Apps Script?

Just to build on vinnief's hacky solution above, I use MsgBox like this:

Browser.msgBox('BorderoToMatriz', Browser.Buttons.OK_CANCEL);

and it acts kinda like a break point, stops the script and outputs whatever string you need to a pop-up box. I find especially in Sheets, where I have trouble with Logger.log, this provides an adequate workaround most times.

Delete item from state array in react

removePeople(e){
    var array = this.state.people;
    var index = array.indexOf(e.target.value); // Let's say it's Bob.
    array.splice(index,1);
}

Redfer doc for more info

Connecting to Postgresql in a docker container from outside

docker ps -a to get container ids then docker exec -it psql -U -W

How can you find out which process is listening on a TCP or UDP port on Windows?

Based on answers with info and kill, for me it is useful to combine them in one command. And you can run this from cmd to get information about process that listen on given port (example 8080):

for /f "tokens=3 delims=LISTENING" %i  in ('netstat -ano ^| findStr "8080" ^| findStr "["') do @tasklist /nh /fi "pid eq %i"

Or if you want to kill it:

for /f "tokens=3 delims=LISTENING" %i  in ('netstat -ano ^| findStr "8080" ^| findStr "["') do @Taskkill /F /IM %i

You can also put those command into a bat file (they will be slightly different - replace %i for %%i):

File `portInfo.bat`

for /f "tokens=3 delims=LISTENING" %%i  in (
    'netstat -ano ^| findStr "%1" ^| findStr "["'
) do @tasklist /nh /fi "pid eq %%i"

File `portKill.bat`

for /f "tokens=3 delims=LISTENING" %%i  in (
    'netstat -ano ^| findStr "%1" ^| findStr "["'
) do @Taskkill /F /IM %%i

Then you from cmd you can do this:

portInfo.bat 8080

portKill.bat 8080

Anaconda / Python: Change Anaconda Prompt User Path

Just Type the Drive Location you want to work with: This worked for me! For example you want to change to D drive in windows:

D:\

If you want to change to particular folder in the drive:

cd D:\Newfolder

What does "Changes not staged for commit" mean

You may see this error when you have added a new file to your code and you're now trying to commit the code without staging(adding) it.

To overcome this, you may first add the file by using git add (git add your_file_name.py) and then committing the changes (git commit -m "Rename Files" -m "Sample script to rename files as you like")

Write / add data in JSON file using Node.js

Please try the following program. You might be expecting this output.

var fs = require('fs');

var data = {}
data.table = []
for (i=0; i <26 ; i++){
   var obj = {
       id: i,
       square: i * i
   }
   data.table.push(obj)
}
fs.writeFile ("input.json", JSON.stringify(data), function(err) {
    if (err) throw err;
    console.log('complete');
    }
);

Save this program in a javascript file, say, square.js.

Then run the program from command prompt using the command node square.js

What it does is, simply overwriting the existing file with new set of data, every time you execute the command.

Happy Coding.

Case insensitive string compare in LINQ-to-SQL

I used System.Data.Linq.SqlClient.SqlMethods.Like(row.Name, "test") in my query.

This performs a case-insensitive comparison.

Most efficient conversion of ResultSet to JSON?

Just as a heads up, the if/then loop is more efficient than the switch for enums. If you have the switch against the raw enum integer, then it's more efficient, but against the variable, if/then is more efficient, at least for Java 5, 6, and 7.

I.e., for some reason (after some performance tests)

if (ordinalValue == 1) {
   ...
} else (ordinalValue == 2 {
   ... 
}

is faster than

switch( myEnum.ordinal() ) {
    case 1:
       ...
       break;
    case 2:
       ...
       break;
}

I see that a few people are doubting me, so I'll post code here that you can run yourself to see the difference, along with output I have from Java 7. The results of the following code with 10 enum values are as follows. Note the key here is the if/then using an integer value comparing against ordinal constants of the enum, vs. the switch with an enum's ordinal value against the raw int ordinal values, vs. a switch with the enum against each enum name. The if/then with an integer value beat out both other switches, although the last switch was a little faster than the first switch, it was not faster than the if/else.

If / else took 23 ms
Switch took 45 ms
Switch 2 took 30 ms
Total matches: 3000000

package testing;

import java.util.Random;

enum TestEnum {
    FIRST,
    SECOND,
    THIRD,
    FOURTH,
    FIFTH,
    SIXTH,
    SEVENTH,
    EIGHTH,
    NINTH,
    TENTH
}

public class SwitchTest {
    private static int LOOP = 1000000;
    private static Random r = new Random();
    private static int SIZE = TestEnum.values().length;

    public static void main(String[] args) {
        long time = System.currentTimeMillis();
        int matches = 0;
        for (int i = 0; i < LOOP; i++) {
            int j = r.nextInt(SIZE);
            if (j == TestEnum.FIRST.ordinal()) {
                matches++;
            } else if (j == TestEnum.SECOND.ordinal()) {
                matches++;
            } else if (j == TestEnum.THIRD.ordinal()) {
                matches++;
            } else if (j == TestEnum.FOURTH.ordinal()) {
                matches++;
            } else if (j == TestEnum.FIFTH.ordinal()) {
                matches++;
            } else if (j == TestEnum.SIXTH.ordinal()) {
                matches++;
            } else if (j == TestEnum.SEVENTH.ordinal()) {
                matches++;
            } else if (j == TestEnum.EIGHTH.ordinal()) {
                matches++;
            } else if (j == TestEnum.NINTH.ordinal()) {
                matches++;
            } else {
                matches++;
            }
        }
        System.out.println("If / else took "+(System.currentTimeMillis() - time)+" ms");
        time = System.currentTimeMillis();
        for (int i = 0; i < LOOP; i++) {
            TestEnum te = TestEnum.values()[r.nextInt(SIZE)];
            switch (te.ordinal()) {
                case 0:
                    matches++;
                    break;
                case 1:
                    matches++;
                    break;
                case 2:
                    matches++;
                    break;
                case 3:
                    matches++;
                    break;
                case 4:
                    matches++;
                    break;
                case 5:
                    matches++;
                    break;
                case 6:
                    matches++;
                    break;
                case 7:
                    matches++;
                    break;
                case 8:
                    matches++;
                    break;
                case 9:
                    matches++;
                    break;
                default:
                    matches++;
                    break;
            }
        }
        System.out.println("Switch took "+(System.currentTimeMillis() - time)+" ms");
        time = System.currentTimeMillis();
        for (int i = 0; i < LOOP; i++) {
            TestEnum te = TestEnum.values()[r.nextInt(SIZE)];
            switch (te) {
                case FIRST:
                    matches++;
                    break;
                case SECOND:
                    matches++;
                    break;
                case THIRD:
                    matches++;
                    break;
                case FOURTH:
                    matches++;
                    break;
                case FIFTH:
                    matches++;
                    break;
                case SIXTH:
                    matches++;
                    break;
                case SEVENTH:
                    matches++;
                    break;
                case EIGHTH:
                    matches++;
                    break;
                case NINTH:
                    matches++;
                    break;
                default:
                    matches++;
                    break;
            }
        }
        System.out.println("Switch 2 took "+(System.currentTimeMillis() - time)+" ms");     
        System.out.println("Total matches: "+matches);
    }
}

Change GridView row color based on condition

\\loop throgh all rows of the grid view  

if (GridView1.Rows[i - 1].Cells[4].Text.ToString() == "value1")
{
   GridView1.Rows[i - 1].ForeColor = Color.Black;
}
else if (GridView1.Rows[i - 1].Cells[4].Text.ToString() == "value2")
{
   GridView1.Rows[i - 1].ForeColor = Color.Blue;
}
else if (GridView1.Rows[i - 1].Cells[4].Text.ToString() == "value3")
{
   GridView1.Rows[i - 1].ForeColor = Color.Red;
}
else if (GridView1.Rows[i - 1].Cells[4].Text.ToString() == "value4")
{
   GridView1.Rows[i - 1].ForeColor = Color.Green;
}

Basic text editor in command prompt?

There is no command based text editors in windows (at least from Windows 7). But you can try the vi windows clone available here : http://www.vim.org/

Typescript empty object for a typed variable

If you declare an empty object literal and then assign values later on, then you can consider those values optional (may or may not be there), so just type them as optional with a question mark:

type User = {
    Username?: string;
    Email?: string;
}

slideToggle JQuery right to left

I would suggest you use the below css

.showhideoverlay { 
  width: 100%;
  height: 100%;
  right: 0px;
  top: 0px;
  position: fixed;
  background: #000;
  opacity: 0.75;
}

You can then use a simple toggle function:

$('a.open').click(function() {
  $('div.showhideoverlay').toggle("slow");
});

This will display the overlay menu from right to left. Alternatively, you can use the positioning for changing the effect from top or bottom, i.e. use bottom: 0; instead of top: 0; - you will see menu sliding from right-bottom corner.

Getting a map() to return a list in Python 3.x

You can try getting a list from the map object by just iterating each item in the object and store it in a different variable.

a = map(chr, [66, 53, 0, 94])
b = [item for item in a]
print(b)
>>>['B', '5', '\x00', '^']

How do I use modulus for float/double?

fmod is the standard C function for handling floating-point modulus; I imagine your source was saying that Java handles floating-point modulus the same as C's fmod function. In Java you can use the % operator on doubles the same as on integers:

int x = 5 % 3; // x = 2
double y = .5 % .3; // y = .2

AngularJS: factory $http.get JSON file

Okay, here's a list of things to look into:

1) If you're not running a webserver of any kind and just testing with file://index.html, then you're probably running into same-origin policy issues. See:

https://code.google.com/archive/p/browsersec/wikis/Part2.wiki#Same-origin_policy

Many browsers don't allow locally hosted files to access other locally hosted files. Firefox does allow it, but only if the file you're loading is contained in the same folder as the html file (or a subfolder).

2) The success function returned from $http.get() already splits up the result object for you:

$http({method: 'GET', url: '/someUrl'}).success(function(data, status, headers, config) {

So it's redundant to call success with function(response) and return response.data.

3) The success function does not return the result of the function you pass it, so this does not do what you think it does:

var mainInfo = $http.get('content.json').success(function(response) {
        return response.data;
    });

This is closer to what you intended:

var mainInfo = null;
$http.get('content.json').success(function(data) {
    mainInfo = data;
});

4) But what you really want to do is return a reference to an object with a property that will be populated when the data loads, so something like this:

theApp.factory('mainInfo', function($http) { 

    var obj = {content:null};

    $http.get('content.json').success(function(data) {
        // you can do some processing here
        obj.content = data;
    });    

    return obj;    
});

mainInfo.content will start off null, and when the data loads, it will point at it.

Alternatively you can return the actual promise the $http.get returns and use that:

theApp.factory('mainInfo', function($http) { 
    return $http.get('content.json');
});

And then you can use the value asynchronously in calculations in a controller:

$scope.foo = "Hello World";
mainInfo.success(function(data) { 
    $scope.foo = "Hello "+data.contentItem[0].username;
});

Get User Selected Range

You can loop through the Selection object to see what was selected. Here is a code snippet from Microsoft (http://msdn.microsoft.com/en-us/library/aa203726(office.11).aspx):

Sub Count_Selection()
    Dim cell As Object
    Dim count As Integer
    count = 0
    For Each cell In Selection
        count = count + 1
    Next cell
    MsgBox count & " item(s) selected"
End Sub

How to append elements at the end of ArrayList in Java?

I know this is an old question, but I wanted to make an answer of my own. here is another way to do this if you "really" want to add to the end of the list instead of using list.add(str) you can do it this way, but I don't recommend.

 String[] items = new String[]{"Hello", "World"};
        ArrayList<String> list = new ArrayList<>();
        Collections.addAll(list, items);
        int endOfList = list.size();
        list.add(endOfList, "This goes end of list");
        System.out.println(Collections.singletonList(list));

this is the 'Compact' way of adding the item to the end of list. here is a safer way to do this, with null checking and more.

String[] items = new String[]{"Hello", "World"};
        ArrayList<String> list = new ArrayList<>();
        Collections.addAll(list, items);
        addEndOfList(list, "Safer way");
        System.out.println(Collections.singletonList(list));

 private static void addEndOfList(List<String> list, String item){
            try{
                list.add(getEndOfList(list), item);
            } catch (IndexOutOfBoundsException e){
                System.out.println(e.toString());
            }
        }

   private static int getEndOfList(List<String> list){
        if(list != null) {
            return list.size();
        }
        return -1;
    }

Heres another way to add items to the end of list, happy coding :)

Check if argparse optional argument is set or not

I think using the option default=argparse.SUPPRESS makes most sense. Then, instead of checking if the argument is not None, one checks if the argument is in the resulting namespace.

Example:

import argparse

parser = argparse.ArgumentParser()
parser.add_argument("--foo", default=argparse.SUPPRESS)
ns = parser.parse_args()

print("Parsed arguments: {}".format(ns))
print("foo in namespace?: {}".format("foo" in ns))

Usage:

$ python argparse_test.py --foo 1
Parsed arguments: Namespace(foo='1')
foo in namespace?: True

Argument is not supplied:

$ python argparse_test.py
Parsed arguments: Namespace()
foo in namespace?: False

Javascript split regex question

you could just use

date.split(/-/);

date.split('-');

Breaking out of nested loops

for x in xrange(10):
    for y in xrange(10):
        print x*y
        if x*y > 50:
            break
    else:
        continue  # only executed if the inner loop did NOT break
    break  # only executed if the inner loop DID break

The same works for deeper loops:

for x in xrange(10):
    for y in xrange(10):
        for z in xrange(10):
            print x,y,z
            if x*y*z == 30:
                break
        else:
            continue
        break
    else:
        continue
    break

Get user's current location

The old freegeoip API is now deprecated and will be discontinued on July 1st, 2018.

The new API is from https://ipstack.com. You have to create the account in ipstack.Then you can use the access key in the API url.

$url = "http://api.ipstack.com/122.167.180.20?access_key=ACCESS_KEY&format=1";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
curl_close($ch);
$response = json_decode($response);
$city  = $response->city; //You can get all the details like longitude,latitude from the $response .

For more information check here :/ https://github.com/apilayer/freegeoip

How to convert a string to an integer in JavaScript?

Fastest

var x = "1000"*1;

Test

Here is little comparison of speed (Mac Os only)... :)

For chrome 'plus' and 'mul' are fastest (>700,000,00 op/sec), 'Math.floor' is slowest. For Firefox 'plus' is slowest (!) 'mul' is fastest (>900,000,000 op/sec). In Safari 'parseInt' is fastes, 'number' is slowest (but resulats are quite similar, >13,000,000 <31,000,000). So Safari for cast string to int is more than 10x slower than other browsers. So the winner is 'mul' :)

You can run it on your browser by this link https://jsperf.com/js-cast-str-to-number/1

Update

I also test var x = ~~"1000"; - on Chrome and Safari is a little bit slower than var x = "1000"*1 (<1%), on Firefox is a little bit faster (<1%). I update above picture and test

How to resolve cURL Error (7): couldn't connect to host?

Are you able to hit that URL by browser or by PHP script? The error shown is that you could not connect. So first confirm that the URL is accessible.

How do I get the resource id of an image if I know its name?

One other scenario which I encountered.

String imageName ="Hello" and then when it is passed into getIdentifier function as first argument, it will pass the name with string null termination and will always return zero. Pass this imageName.substring(0, imageName.length()-1)

Check if string ends with certain pattern

    String input1 = "This.is.a.great.place.too.work.";
    String input2 = "This/is/a/great/place/too/work/";
    String input3 = "This,is,a,great,place,too,work,";
    String input4 = "This.is.a.great.place.too.work.hahahah";
    String input5 = "This/is/a/great/place/too/work/hahaha";
    String input6 = "This,is,a,great,place,too,work,hahahha";
    
    String regEx = ".*work[.,/]";
    
    System.out.println(input1.matches(regEx)); // true
    System.out.println(input2.matches(regEx)); // true
    System.out.println(input3.matches(regEx)); // true
    System.out.println(input4.matches(regEx)); // false
    System.out.println(input5.matches(regEx)); // false
    System.out.println(input6.matches(regEx)); // false

How to dismiss keyboard iOS programmatically when pressing return

I know this have been answered by others, but i found the another article that covered also for no background event - tableview or scrollview.

http://samwize.com/2014/03/27/dismiss-keyboard-when-tap-outside-a-uitextfield-slash-uitextview/

Can I use GDB to debug a running process?

Yes you can. Assume a process foo is running...

ps -elf | grep foo

look for the PID number

gdb -a {PID number}

I need to know how to get my program to output the word i typed in and also the new rearranged word using a 2D array

What exactly doesn't work?
Why are you using a 2d array?

If you must use a 2d array:

int numOfPairs = 10;  String[][] array = new String[numOfPairs][2]; for(int i = 0; i < array.length; i++){     for(int j = 0; j < array[i].length; j++){         array[i] = new String[2];         array[i][0] = "original word";         array[i][1] = "rearranged word";     }    }

Does this give you a hint?

How do shift operators work in Java?

The typical usage of shifting a variable and assigning back to the variable can be rewritten with shorthand operators <<=, >>=, or >>>=, also known in the spec as Compound Assignment Operators.

For example,

i >>= 2

produces the same result as

i = i >> 2

How to get current html page title with javascript

One option from DOM directly:

$(document).find("title").text();

Tested only on chrome & IE9, but logically should work on all browsers.

Or more generic

var title = document.getElementsByTagName("title")[0].innerHTML;

Relay access denied on sending mail, Other domain outside of network

Set your SMTP auth to true if using the PHPmailer class:

$mail->SMTPAuth = true;

Simulate Keypress With jQuery

Another option:

$(el).trigger({type: 'keypress', which: 13, keyCode: 13});

http://api.jquery.com/trigger/

What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?

ClassNotFoundException and NoClassDefFoundError occur when a particular class is not found at runtime.However, they occur at different scenarios.

ClassNotFoundException is an exception that occurs when you try to load a class at run time using Class.forName() or loadClass() methods and mentioned classes are not found in the classpath.

    public class MainClass
    {
        public static void main(String[] args)
        {
            try
            {
                Class.forName("oracle.jdbc.driver.OracleDriver");
            }catch (ClassNotFoundException e)
            {
                e.printStackTrace();
            }
        }
    }



    java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at pack1.MainClass.main(MainClass.java:17)

NoClassDefFoundError is an error that occurs when a particular class is present at compile time, but was missing at run time.

    class A
    {
      // some code
    }
    public class B
    {
        public static void main(String[] args)
        {
            A a = new A();
        }
    }

When you compile the above program, two .class files will be generated. One is A.class and another one is B.class. If you remove the A.class file and run the B.class file, Java Runtime System will throw NoClassDefFoundError like below:

    Exception in thread "main" java.lang.NoClassDefFoundError: A
    at MainClass.main(MainClass.java:10)
    Caused by: java.lang.ClassNotFoundException: A
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

Is there a foreach in MATLAB? If so, how does it behave if the underlying data changes?

The MATLAB for loop basically allows huge flexibility, including the foreach functionality. Here some examples:

1) Define start, increment and end index

for test = 1:3:9
   test
end

2) Loop over vector

for test = [1, 3, 4]
   test
end

3) Loop over string

for test = 'hello'
   test
end

4) Loop over a one-dimensional cell array

for test = {'hello', 42, datestr(now) ,1:3}
   test
end

5) Loop over a two-dimensional cell array

for test = {'hello',42,datestr(now) ; 'world',43,datestr(now+1)}
   test(1)   
   test(2)
   disp('---')
end

6) Use fieldnames of structure arrays

s.a = 1:3 ; s.b = 10  ; 
for test = fieldnames(s)'
   s.(cell2mat(test))
end

Converting Object to JSON and JSON to Object in PHP, (library like Gson for Java)

I made a method to solve this. My approach is:

1 - Create a abstract class that have a method to convert Objects to Array (including private attr) using Regex. 2 - Convert the returned array to json.

I use this Abstract class as parent of all my domain classes

Class code:

namespace Project\core;

abstract class AbstractEntity {
    public function getAvoidedFields() {
        return array ();
    }
    public function toArray() {
        $temp = ( array ) $this;

        $array = array ();

        foreach ( $temp as $k => $v ) {
            $k = preg_match ( '/^\x00(?:.*?)\x00(.+)/', $k, $matches ) ? $matches [1] : $k;
            if (in_array ( $k, $this->getAvoidedFields () )) {
                $array [$k] = "";
            } else {

                // if it is an object recursive call
                if (is_object ( $v ) && $v instanceof AbstractEntity) {
                    $array [$k] = $v->toArray();
                }
                // if its an array pass por each item
                if (is_array ( $v )) {

                    foreach ( $v as $key => $value ) {
                        if (is_object ( $value ) && $value instanceof AbstractEntity) {
                            $arrayReturn [$key] = $value->toArray();
                        } else {
                            $arrayReturn [$key] = $value;
                        }
                    }
                    $array [$k] = $arrayReturn;
                }
                // if it is not a array and a object return it
                if (! is_object ( $v ) && !is_array ( $v )) {
                    $array [$k] = $v;
                }
            }
        }

        return $array;
    }
}

Stretch horizontal ul to fit width of div

People hate on tables for non-tabular data, but what you're asking for is exactly what tables are good at. <table width="100%">

Deprecated meaning?

Deprecated means they don't recommend using it, and that it isn't undergoing further development. But it should not work differently than it did in a previous version unless documentation explicitly states that.

Yes, otherwise it wouldn't be called "deprecated"
Unless stated otherwise in docs, it should be the same as before
No, but if there were problems in v1 they aren't about to fix them

How to retrieve a file from a server via SFTP?

Try edtFTPj/PRO, a mature, robust SFTP client library that supports connection pools and asynchronous operations. Also supports FTP and FTPS so all bases for secure file transfer are covered.

Understanding the basics of Git and GitHub

What is the difference between Git and GitHub?

Git is a distributed version control system. It usually runs at the command line of your local machine. It keeps track of your files and modifications to those files in a "repository" (or "repo"), but only when you tell it to do so. (In other words, you decide which files to track and when to take a "snapshot" of any modifications.)

In contrast, GitHub is a website that allows you to publish your Git repositories online, which can be useful for many reasons (see #3).
Is Git saving every repository locally (in the user's machine) and in GitHub?

Git is known as a "distributed" (rather than "centralized") version control system because you can run it locally and disconnected from the Internet, and then "push" your changes to a remote system (such as GitHub) whenever you like. Thus, repo changes only appear on GitHub when you manually tell Git to push those changes.
Can you use Git without GitHub? If yes, what would be the benefit for using GitHub?

Yes, you can use Git without GitHub. Git is the "workhorse" program that actually tracks your changes, whereas GitHub is simply hosting your repositories (and provides additional functionality not available in Git). Here are some of the benefits of using GitHub:
- It provides a backup of your files.
- It gives you a visual interface for navigating your repos.
- It gives other people a way to navigate your repos.
- It makes repo collaboration easy (e.g., multiple people contributing to the same project).
- It provides a lightweight issue tracking system.
How does Git compare to a backup system such as Time Machine?

Git does backup your files, though it gives you much more granular control than a traditional backup system over what and when you backup. Specifically, you "commit" every time you want to take a snapshot of changes, and that commit includes both a description of your changes and the line-by-line details of those changes. This is optimal for source code because you can easily see the change history for any given file at a line-by-line level.
Is this a manual process, in other words if you don't commit you won't have a new version of the changes made?

Yes, this is a manual process.
If are not collaborating and you are already using a backup system why would you use Git?
- Git employs a powerful branching system that allows you to work on multiple, independent lines of development simultaneously and then merge those branches together as needed.
- Git allows you to view the line-by-line differences between different versions of your files, which makes troubleshooting easier.
- Git forces you to describe each of your commits, which makes it significantly easier to track down a specific previous version of a given file (and potentially revert to that previous version).
- If you ever need help with your code, having it tracked by Git and hosted on GitHub makes it much easier for someone else to look at your code.

For getting started with Git, I recommend the online book Pro Git as well as GitRef as a handy reference guide. For getting started with GitHub, I like the GitHub's Bootcamp and their GitHub Guides. Finally, I created a short videos series to introduce Git and GitHub to beginners.

if (boolean condition) in Java

Booleans default value is false only for classes' fields. If within a method, you have to initialize your variable by true or false. Thus for example in your case, you'll have a compilation error.

Moreover, I don't really get the point, but the only way to enter within a if is to evaluate the condition to true.

Purpose of Unions in C and C++

The behavior is undefined from the language point of view. Consider that different platforms can have different constraints in memory alignment and endianness. The code in a big endian versus a little endian machine will update the values in the struct differently. Fixing the behavior in the language would require all implementations to use the same endianness (and memory alignment constraints...) limiting use.

If you are using C++ (you are using two tags) and you really care about portability, then you can just use the struct and provide a setter that takes the uint32_t and sets the fields appropriately through bitmask operations. The same can be done in C with a function.

Edit: I was expecting AProgrammer to write down an answer to vote and close this one. As some comments have pointed out, endianness is dealt in other parts of the standard by letting each implementation decide what to do, and alignment and padding can also be handled differently. Now, the strict aliasing rules that AProgrammer implicitly refers to are a important point here. The compiler is allowed to make assumptions on the modification (or lack of modification) of variables. In the case of the union, the compiler could reorder instructions and move the read of each color component over the write to the colour variable.

Could not find module FindOpenCV.cmake ( Error in configuration process)

find / -name "OpenCVConfig.cmake"

export OpenCV_DIR=/path/found/above

Foreach Control in form, how can I do something to all the TextBoxes in my Form?

foreach (Control X in this.Controls)
{
  if (X is TextBox)
  {
    (X as TextBox).Text = string.Empty;
  }
}

Take a full page screenshot with Firefox on the command-line

Firefox Screenshots is a new tool that ships with Firefox. It is not a developer tool, it is aimed at end-users of the browser.

To take a screenshot, click on the page actions menu in the address bar, and click "take a screenshot". If you then click "Save full page", it will save the full page, scrolling for you.

_{(source: mozilla.net)}

Get latitude and longitude automatically using php, API

//add urlencode to your address
$address = urlencode("technopark, Trivandrun, kerala,India");
$region = "IND";
$json = file_get_contents("http://maps.google.com/maps/api/geocode/json?address=$address&sensor=false&region=$region");

echo $json;

$decoded = json_decode($json);

print_r($decoded);

Populating Spring @Value during Unit Test

Its quite old question, and I'm not sure if it was an option at that time, but this is the reason why I always prefer DependencyInjection by the constructor than by the value.

I can imagine that your class might look like this:

class ExampleClass{

   @Autowired
   private Dog dog;

   @Value("${this.property.value}") 
   private String thisProperty;

   ...other stuff...
}

You can change it to:

class ExampleClass{

   private Dog dog;
   private String thisProperty;

   //optionally @Autowire
   public ExampleClass(final Dog dog, @Value("${this.property.value}") final String thisProperty){
      this.dog = dog;
      this.thisProperty = thisProperty;
   }

   ...other stuff...
}

With this implementation, the spring will know what to inject automatically, but for unit testing, you can do whatever you need. For example Autowire every dependency wth spring, and inject them manually via constructor to create "ExampleClass" instance, or use only spring with test property file, or do not use spring at all and create all object yourself.

$lookup on ObjectId's in an array

You can also use the pipeline stage to perform checks on a sub-docunment array

Here's the example using python (sorry I'm snake people).

db.products.aggregate([
  { '$lookup': {
      'from': 'products',
      'let': { 'pid': '$products' },
      'pipeline': [
        { '$match': { '$expr': { '$in': ['$_id', '$$pid'] } } }
        // Add additional stages here 
      ],
      'as':'productObjects'
  }
])

The catch here is to match all objects in the ObjectId array (foreign _id that is in local field/prop products).

You can also clean up or project the foreign records with additional stages, as indicated by the comment above.

Change keystore password from no password to a non blank password

On my system the password is 'changeit'. On blank if I hit enter then it complains about short password. Hope this helps

How do I best silence a warning about unused variables?

An even cleaner way is to just comment out variable names:

int main(int /* argc */, char const** /* argv */) {
  return 0;
}

Is there a way to use use text as the background with CSS?

You could make the element containing the bg text have a lower stacking order ( z-index, position ) and possibly even set opacity. So the element you need on top would need a higher stacking order ( z-index:5; position:relative; for ex ) and the element behind would need something lower ( default or just a lower z-index like 3 and position:relative; ).

Daemon not running. Starting it now on port 5037

This worked for me: Open task manager (of your OS) and kill adb.exe process. Now start adb again, now adb should start normally.

Sorting an ArrayList of objects using a custom sorting order

The Collections.sort is a good sort implementation. If you don't have The comparable implemented for Contact, you will need to pass in a Comparator implementation

Of note:

The sorting algorithm is a modified mergesort (in which the merge is omitted if the highest element in the low sublist is less than the lowest element in the high sublist). This algorithm offers guaranteed n log(n) performance. The specified list must be modifiable, but need not be resizable. This implementation dumps the specified list into an array, sorts the array, and iterates over the list resetting each element from the corresponding position in the array. This avoids the n2 log(n) performance that would result from attempting to sort a linked list in place.

The merge sort is probably better than most search algorithm you can do.

OPTION (RECOMPILE) is Always Faster; Why?

To add to the excellent list (given by @CodeCowboyOrg) of situations where OPTION(RECOMPILE) can be very helpful,

Table Variables. When you are using table variables, there will not be any pre-built statistics for the table variable, often leading to large differences between estimated and actual rows in the query plan. Using OPTION(RECOMPILE) on queries with table variables allows generation of a query plan that has a much better estimate of the row numbers involved. I had a particularly critical use of a table variable that was unusable, and which I was going to abandon, until I added OPTION(RECOMPILE). The run time went from hours to just a few minutes. That is probably unusual, but in any case, if you are using table variables and working on optimizing, it's well worth seeing whether OPTION(RECOMPILE) makes a difference.

How to put text in the upper right, or lower right corner of a "box" using css

You may be able to use absolute positioning.

The container box should be set to position: relative.

The top-right text should be set to position: absolute; top: 0; right: 0. The bottom-right text should be set to position: absolute; bottom: 0; right: 0.

You'll need to experiment with padding to stop the main contents of the box from running underneath the absolute positioned elements, as they exist outside the normal flow of the text contents.

Import Excel to Datagridview

try the following program

using System;
using System.Data;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        System.Data.OleDb.OleDbConnection MyConnection;
        System.Data.DataSet DtSet;
        System.Data.OleDb.OleDbDataAdapter MyCommand;
        MyConnection = new System.Data.OleDb.OleDbConnection(@"provider=Microsoft.Jet.OLEDB.4.0;Data Source='c:\csharp.net-informations.xls';Extended Properties=Excel 8.0;");
        MyCommand = new System.Data.OleDb.OleDbDataAdapter("select * from [Sheet1$]", MyConnection);
        MyCommand.TableMappings.Add("Table", "Net-informations.com");
        DtSet = new System.Data.DataSet();
        MyCommand.Fill(DtSet);
        dataGridView1.DataSource = DtSet.Tables[0];
        MyConnection.Close();
    }
}
}

How do I get my accordion to load with all the menus closed?

How to format a number 0..9 to display with 2 digits (it's NOT a date)

I know that is late to respond, but there are a basic way to do it, with no libraries. If your number is less than 100, then:

(number/100).toFixed(2).toString().slice(2);

python: iterate a specific range in a list

A more memory efficient way to iterate over a slice of a list would be to use islice() from the itertools module:

from itertools import islice

listOfStuff = (['a','b'], ['c','d'], ['e','f'], ['g','h'])

for item in islice(listOfStuff, 1, 3):
    print item

# ['c', 'd']
# ['e', 'f']

However, this can be relatively inefficient in terms of performance if the start value of the range is a large value sinceislicewould have to iterate over the first start value-1 items before returning items.

How to draw a custom UIView that is just a circle - iPhone app

My contribution with a Swift extension:

extension UIView {
    func asCircle() {
        self.layer.cornerRadius = self.frame.width / 2;
        self.layer.masksToBounds = true
    }
}

Just call myView.asCircle()

In Bootstrap open Enlarge image in modal

You can try this code if you are using bootstrap 3:

HTML

<a href="#" id="pop">
    <img id="imageresource" src="http://patyshibuya.com.br/wp-content/uploads/2014/04/04.jpg" style="width: 400px; height: 264px;">
    Click to Enlarge
</a>

<!-- Creates the bootstrap modal where the image will appear -->
<div class="modal fade" id="imagemodal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
        <h4 class="modal-title" id="myModalLabel">Image preview</h4>
      </div>
      <div class="modal-body">
        <img src="" id="imagepreview" style="width: 400px; height: 264px;" >
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
      </div>
    </div>
  </div>
</div>

JavaScript:

$("#pop").on("click", function() {
   $('#imagepreview').attr('src', $('#imageresource').attr('src')); // here asign the image to the modal when the user click the enlarge link
   $('#imagemodal').modal('show'); // imagemodal is the id attribute assigned to the bootstrap modal, then i use the show function
});

This is the working fiddle. Hope this helps :)

Collections sort(List<T>,Comparator<? super T>) method example

Building upon your existing Student class, this is how I usually do it, especially if I need more than one comparator.

public class Student implements Comparable<Student> {

    String name;
    int age;

    public Student(String name, int age) {
       this.name = name;
       this.age = age;
    }

    @Override
    public String toString() {
        return name + ":" + age;
    }

    @Override
    public int compareTo(Student o) {
        return Comparators.NAME.compare(this, o);
    }


    public static class Comparators {

        public static Comparator<Student> NAME = new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                return o1.name.compareTo(o2.name);
            }
        };
        public static Comparator<Student> AGE = new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                return o1.age - o2.age;
            }
        };
        public static Comparator<Student> NAMEANDAGE = new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                int i = o1.name.compareTo(o2.name);
                if (i == 0) {
                    i = o1.age - o2.age;
                }
                return i;
            }
        };
    }
}

Usage:

List<Student> studentList = new LinkedList<>();
Collections.sort(studentList, Student.Comparators.AGE);

EDIT

Since the release of Java 8 the inner class Comparators may be greatly simplified using lambdas. Java 8 also introduces a new method for the Comparator object thenComparing, which removes the need for doing manual checking of each comparator when nesting them. Below is the Java 8 implementation of the Student.Comparators class with these changes taken into account.

public static class Comparators {
    public static final Comparator<Student> NAME = (Student o1, Student o2) -> o1.name.compareTo(o2.name);
    public static final Comparator<Student> AGE = (Student o1, Student o2) -> Integer.compare(o1.age, o2.age);
    public static final Comparator<Student> NAMEANDAGE = (Student o1, Student o2) -> NAME.thenComparing(AGE).compare(o1, o2);
}

Adding quotes to a string in VBScript

You can do like:

a="""xyz"""  
g="abcd " & a

Or:

a=chr(34) & "xyz" & chr(34)
g="abcd " & a

Python PIP Install throws TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'

I tried the solution answered above:

apt-get remove python-pip python3-pip
wget https://bootstrap.pypa.io/get-pip.py
python get-pip.py
python3 get-pip.py

When I tried

python get-pip.py 
python3 get-pip.py

I got this message

 Could not install packages due to an EnvironmentError:
[Errno 13] Permission denied: /usr/bin/pip3 Consider using the --user
 option or check the permissions.

I did the following and it works

python3 -m venv env
source ./env/bin/activate
Sudo apt-get update 
apt-get remove python-pip python3-pip
wget https://bootstrap.pypa.io/get-pip.py
python get-pip.py
python3 get-pip.py
pip3 install pip
sudo easy_install pip
pip install --upgrade pip

How to read from stdin line by line in Node

// Work on POSIX and Windows
var fs = require("fs");
var stdinBuffer = fs.readFileSync(0); // STDIN_FILENO = 0
console.log(stdinBuffer.toString());

Oracle copy data to another table

If you want to create table with data . First create the table :

create table new_table as ( select * from old_table);

and then insert

insert into new_table ( select * from old_table);

If you want to create table without data . You can use :

create table new_table as ( select * from old_table where 1=0);

MySQL and GROUP_CONCAT() maximum length

The short answer: the setting needs to be setup when the connection to the MySQL server is established. For example, if using MYSQLi / PHP, it will look something like this:

$ myConn = mysqli_init(); 
$ myConn->options(MYSQLI_INIT_COMMAND, 'SET SESSION group_concat_max_len = 1000000');

Therefore, if you are using a home-brewed framework, well, you need to look for the place in the code when the connection is establish and provide a sensible value.

I am still using Codeigniter 3 on 2020, so in this framework, the code to add is in the application/system/database/drivers/mysqli/mysqli_driver.php, the function is named db_connect();

public function db_connect($persistent = FALSE)
    {
        // Do we have a socket path?
        if ($this->hostname[0] === '/')
        {
            $hostname = NULL;
            $port = NULL;
            $socket = $this->hostname;
        }
        else
        {
            $hostname = ($persistent === TRUE)
                ? 'p:'.$this->hostname : $this->hostname;
            $port = empty($this->port) ? NULL : $this->port;
            $socket = NULL;
        }

        $client_flags = ($this->compress === TRUE) ? MYSQLI_CLIENT_COMPRESS : 0;
        $this->_mysqli = mysqli_init();

        $this->_mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 10);
        $this->_mysqli->options(MYSQLI_INIT_COMMAND, 'SET SESSION group_concat_max_len = 1000000');

...
    }

How to use delimiter for csv in python

ok, here is what i understood from your question. You are writing a csv file from python but when you are opening that file into some other application like excel or open office they are showing the complete row in one cell rather than each word in individual cell. I am right??

if i am then please try this,

import csv

with open(r"C:\\test.csv", "wb") as csv_file:
    writer = csv.writer(csv_file, delimiter =",",quoting=csv.QUOTE_MINIMAL)
    writer.writerow(["a","b"])

you have to set the delimiter = ","

How to Get enum item name from its value

Here is another neat trick to define enum using X Macro:

#include <iostream>

#define WEEK_DAYS \
X(MON, "Monday", true) \
X(TUE, "Tuesday", true) \
X(WED, "Wednesday", true) \
X(THU, "Thursday", true) \
X(FRI, "Friday", true) \
X(SAT, "Saturday", false) \
X(SUN, "Sunday", false)

#define X(day, name, workday) day,
enum WeekDay : size_t
{
    WEEK_DAYS
};
#undef X

#define X(day, name, workday) name,
char const *weekday_name[] =
{
    WEEK_DAYS
};
#undef X

#define X(day, name, workday) workday,
bool weekday_workday[]
{
    WEEK_DAYS
};
#undef X

int main()
{
    std::cout << "Enum value: " << WeekDay::THU << std::endl;
    std::cout << "Name string: " << weekday_name[WeekDay::THU] << std::endl;
    std::cout << std::boolalpha << "Work day: " << weekday_workday[WeekDay::THU] << std::endl;

    WeekDay wd = SUN;
    std::cout << "Enum value: " << wd << std::endl;
    std::cout << "Name string: " << weekday_name[wd] << std::endl;
    std::cout << std::boolalpha << "Work day: " << weekday_workday[wd] << std::endl;

    return 0;
}

Live Demo: https://ideone.com/bPAVTM

Outputs:

Enum value: 3
Name string: Thursday
Work day: true
Enum value: 6
Name string: Sunday
Work day: false

Is it possible in Java to access private fields via reflection

Yes it is possible.

You need to use the getDeclaredField method (instead of the getField method), with the name of your private field:

Field privateField = Test.class.getDeclaredField("str");

Additionally, you need to set this Field to be accessible, if you want to access a private field:

privateField.setAccessible(true);

Once that's done, you can use the get method on the Field instance, to access the value of the str field.

Find the closest ancestor element that has a specific class

@rvighne solution works well, but as identified in the comments ParentElement and ClassList both have compatibility issues. To make it more compatible, I have used:

function findAncestor (el, cls) {
    while ((el = el.parentNode) && el.className.indexOf(cls) < 0);
    return el;
}

parentNode property instead of the parentElement property
indexOf method on the className property instead of the contains method on the classList property.

Of course, indexOf is simply looking for the presence of that string, it does not care if it is the whole string or not. So if you had another element with class 'ancestor-type' it would still return as having found 'ancestor', if this is a problem for you, perhaps you can use regexp to find an exact match.

SQL JOIN vs IN performance?

Each database's implementation but you can probably guess that they all solve common problems in more or less the same way. If you are using MSSQL have a look at the execution plan that is generated. You can do this by turning on the profiler and executions plans. This will give you a text version when you run the command.

I am not sure what version of MSSQL you are using but you can get a graphical one in SQL Server 2000 in the query analyzer. I am sure that this functionality is lurking some where in SQL Server Studio Manager in later versions.

Have a look at the exeuction plan. As far as possible avoid table scans unless of course your table is small in which case a table scan is faster than using an index. Read up on the different join operations that each different scenario produces.

Convert HashBytes to VarChar

Contrary to what David Knight says, these two alternatives return the same response in MS SQL 2008:

SELECT CONVERT(VARCHAR(32),HashBytes('MD5', 'Hello World'),2)
SELECT UPPER(master.dbo.fn_varbintohexsubstring(0, HashBytes('MD5', 'Hello World'), 1, 0))

So it looks like the first one is a better choice, starting from version 2008.

Converting a string to a date in a cell

Have you tried the =DateValue() function?

To include time value, just add the functions together:

=DateValue(A1)+TimeValue(A1)

How can I set the maximum length of 6 and minimum length of 6 in a textbox?

You could do it with JavaScript with something like this:

<input onblur="checkLength(this)" id="groupidtext" type="text" style="width: 100px;" maxlength="6" />
<!-- Or use event onkeyup instead if you want to check every character strike -->

function checkLength(el) {
  if (el.value.length != 6) {
    alert("length must be exactly 6 characters")
  }
}

Note this would work in older browsers which don't support HTML 5, but it relies on the user having JavaScript switched on.

Python 'If not' syntax

Yes, if bar is not None is more explicit, and thus better, assuming it is indeed what you want. That's not always the case, there are subtle differences: if not bar: will execute if bar is any kind of zero or empty container, or False. Many people do use not bar where they really do mean bar is not None.

How to show/hide an element on checkbox checked/unchecked states using jQuery?

Attach onchange event to the checkbox:

<input class="coupon_question" type="checkbox" name="coupon_question" value="1" onchange="valueChanged()"/>

<script type="text/javascript">
    function valueChanged()
    {
        if($('.coupon_question').is(":checked"))   
            $(".answer").show();
        else
            $(".answer").hide();
    }
</script>

SQL Server 2008: How to query all databases sizes?

please find more deatils or download the script from below link https://gallery.technet.microsoft.com/SIZE-OF-ALL-DATABASES-IN-0337f6d5#content

 DECLARE @spacetable table
 (
 database_name varchar(50) ,
 total_size_data int,
 space_util_data int,
 space_data_left int,
 percent_fill_data float,
 total_size_data_log int,
 space_util_log int,
 space_log_left int,
 percent_fill_log char(50),
 [total db size] int,
 [total size used] int,
 [total size left] int
 )
 insert into  @spacetable
 EXECUTE master.sys.sp_MSforeachdb 'USE [?];
 select x.[DATABASE NAME],x.[total size data],x.[space util],x.[total size data]-x.[space util] [space left data],
 x.[percent fill],y.[total size log],y.[space util],
 y.[total size log]-y.[space util] [space left log],y.[percent fill],
 y.[total size log]+x.[total size data] ''total db size''
 ,x.[space util]+y.[space util] ''total size used'',
 (y.[total size log]+x.[total size data])-(y.[space util]+x.[space util]) ''total size left''
  from (select DB_NAME() ''DATABASE NAME'',
 sum(size*8/1024) ''total size data'',sum(FILEPROPERTY(name,''SpaceUsed'')*8/1024) ''space util''
 ,case when sum(size*8/1024)=0 then ''less than 1% used'' else
 substring(cast((sum(FILEPROPERTY(name,''SpaceUsed''))*1.0*100/sum(size)) as CHAR(50)),1,6) end ''percent fill''
 from sys.master_files where database_id=DB_ID(DB_NAME())  and  type=0
 group by type_desc  ) as x ,
 (select 
 sum(size*8/1024) ''total size log'',sum(FILEPROPERTY(name,''SpaceUsed'')*8/1024) ''space util''
 ,case when sum(size*8/1024)=0 then ''less than 1% used'' else
 substring(cast((sum(FILEPROPERTY(name,''SpaceUsed''))*1.0*100/sum(size)) as CHAR(50)),1,6) end ''percent fill''
 from sys.master_files where database_id=DB_ID(DB_NAME())  and  type=1
 group by type_desc  )y'
 select * from @spacetable
 order by database_name

How to update and order by using ms sql

I have to offer this as a better approach - you don't always have the luxury of an identity field:

UPDATE m
SET [status]=10
FROM (
  Select TOP (10) *
  FROM messages
  WHERE [status]=0
  ORDER BY [priority] DESC
) m

You can also make the sub-query as complicated as you want - joining multiple tables, etc...

Why is this better? It does not rely on the presence of an identity field (or any other unique column) in the messages table. It can be used to update the top N rows from any table, even if that table has no unique key at all.

What is the difference between Multiple R-squared and Adjusted R-squared in a single-variate least squares regression?

Note that, in addition to number of predictive variables, the Adjusted R-squared formula above also adjusts for sample size. A small sample will give a deceptively large R-squared.

Ping Yin & Xitao Fan, J. of Experimental Education 69(2): 203-224, "Estimating R-squared shrinkage in multiple regression", compares different methods for adjusting r-squared and concludes that the commonly-used ones quoted above are not good. They recommend the Olkin & Pratt formula.

However, I've seen some indication that population size has a much larger effect than any of these formulas indicate. I am not convinced that any of these formulas are good enough to allow you to compare regressions done with very different sample sizes (e.g., 2,000 vs. 200,000 samples; the standard formulas would make almost no sample-size-based adjustment). I would do some cross-validation to check the r-squared on each sample.

How do I change JPanel inside a JFrame on the fly?

I suggest you to add both panel at frame creation, then change the visible panel by calling setVisible(true/false) on both. When calling setVisible, the parent will be notified and asked to repaint itself.

I cannot start SQL Server browser

run > regedit > HKEY_LOCAL_MACHINE > SOFTWARE > WOW6432Node > Microsoft > Microsoft SQL Server > 90 > SQL Browser > SsrpListener=0

Edit seaborn legend

If legend_out is set to True then legend is available thought g._legend property and it is a part of a figure. Seaborn legend is standard matplotlib legend object. Therefore you may change legend texts like:

import seaborn as sns

tips = sns.load_dataset("tips")
g = sns.lmplot(x="total_bill", y="tip", hue="smoker",
 data=tips, markers=["o", "x"], legend_out = True)

# title
new_title = 'My title'
g._legend.set_title(new_title)
# replace labels
new_labels = ['label 1', 'label 2']
for t, l in zip(g._legend.texts, new_labels): t.set_text(l)

sns.plt.show()

Another situation if legend_out is set to False. You have to define which axes has a legend (in below example this is axis number 0):

import seaborn as sns

tips = sns.load_dataset("tips")
g = sns.lmplot(x="total_bill", y="tip", hue="smoker",
 data=tips, markers=["o", "x"], legend_out = False)

# check axes and find which is have legend
leg = g.axes.flat[0].get_legend()
new_title = 'My title'
leg.set_title(new_title)
new_labels = ['label 1', 'label 2']
for t, l in zip(leg.texts, new_labels): t.set_text(l)
sns.plt.show()

Moreover you may combine both situations and use this code:

import seaborn as sns

tips = sns.load_dataset("tips")
g = sns.lmplot(x="total_bill", y="tip", hue="smoker",
 data=tips, markers=["o", "x"], legend_out = True)

# check axes and find which is have legend
for ax in g.axes.flat:
    leg = g.axes.flat[0].get_legend()
    if not leg is None: break
# or legend may be on a figure
if leg is None: leg = g._legend

# change legend texts
new_title = 'My title'
leg.set_title(new_title)
new_labels = ['label 1', 'label 2']
for t, l in zip(leg.texts, new_labels): t.set_text(l)

sns.plt.show()

This code works for any seaborn plot which is based on Grid class.

HttpServletRequest - Get query string parameters, no form data

As the other answers state there is no way getting query string parameters using servlet api.

So, I think the best way to get query parameters is parsing the query string yourself. ( It is more complicated iterating over parameters and checking if query string contains the parameter)

I wrote below code to get query string parameters. Using apache StringUtils and ArrayUtils which supports CSV separated query param values as well.

Example: username=james&username=smith&password=pwd1,pwd2 will return

password : [pwd1, pwd2] (length = 2)

username : [james, smith] (length = 2)

public static Map<String, String[]> getQueryParameters(HttpServletRequest request) throws UnsupportedEncodingException {
    Map<String, String[]> queryParameters = new HashMap<>();
    String queryString = request.getQueryString();
    if (StringUtils.isNotEmpty(queryString)) {
        queryString = URLDecoder.decode(queryString, StandardCharsets.UTF_8.toString());
        String[] parameters = queryString.split("&");
        for (String parameter : parameters) {
            String[] keyValuePair = parameter.split("=");
            String[] values = queryParameters.get(keyValuePair[0]);
            //length is one if no value is available.
            values = keyValuePair.length == 1 ? ArrayUtils.add(values, "") :
                    ArrayUtils.addAll(values, keyValuePair[1].split(",")); //handles CSV separated query param values.
            queryParameters.put(keyValuePair[0], values);
        }
    }
    return queryParameters;
}

How to prevent column break within an element?

set following to the style of the element that you don't want to break:

overflow: hidden; /* fix for Firefox */
break-inside: avoid-column;
-webkit-column-break-inside: avoid;

PostgreSQL delete all content

Use the TRUNCATE TABLE command.

How can I add numbers in a Bash script?

I really like this method as well, less clutter:

count=$[count+1]

How do I pass an object from one activity to another on Android?

Your object can also implement the Parcelable interface. Then you can use the Bundle.putParcelable() method and pass your object between activities within intent.

The Photostream application uses this approach and may be used as a reference.

Best C/C++ Network Library

Aggregated List of Libraries

Boost.Asio is really good.
Asio is also available as a stand-alone library.
ACE is also good, a bit more mature and has a couple of books to support it.
C++ Network Library
POCO
Qt
Raknet
ZeroMQ (C++)
nanomsg (C Library)
nng (C Library)
Berkeley Sockets
libevent
Apache APR
yield
Winsock2(Windows only)
wvstreams
zeroc
libcurl
libuv (Cross-platform C library)
SFML's Network Module
C++ Rest SDK (Casablanca)
RCF
Restbed (HTTP Asynchronous Framework)
SedNL
SDL_net
OpenSplice|DDS
facil.io (C, with optional HTTP and Websockets, Linux / BSD / macOS)
GLib Networking
grpc from Google
GameNetworkingSockets from Valve
CYSockets To do easy things in the easiest way

I have never set any passwords to my keystore and alias, so how are they created?

Keystore name: "debug.keystore"

Keystore password: "android"

Key alias: "androiddebugkey"

Key password: "android"

I use this information and successfully generate Signed APK.

How to run Spyder in virtual environment?

To do without reinstalling spyder in all environments follow official reference here.

In summary (tested with conda):

Spyder should be installed in the base environment

From the system prompt:

Create an new environment. Note that depending on how you create it (conda, virtualenv) the environment folder will be located at different place on your system)
Activate the environment (e.g., conda activate [yourEnvName])
Install spyder-kernels inside the environment (e.g., conda install spyder-kernels)
Find and copy the path for the python executable inside the environment. Finding this path can be done using from the prompt this command python -c "import sys; print(sys.executable)"
Deactivate the environment (i.e., return to base conda deactivate)
run spyder (spyder3)
Finally in spyder Tool menu go to Preferences > Python Interpreter > Use the following interpreter and paste the environment python executable path
Restart the ipython console

PS: in spyder you should see at the bottom something like this

Voila

Override browser form-filling and input highlighting with HTML/CSS

Please try with autocomplete="none" in your input tag

This works for me

how to replace an entire column on Pandas.DataFrame

If the indices match then:

df['B'] = df1['E']

should work otherwise:

df['B'] = df1['E'].values

will work so long as the length of the elements matches

How do I get the scroll position of a document?

Here's how to get the scrollHeight of an element obtained using a jQuery selector:

$(selector)[0].scrollHeight

If selector is the id of the element (e.g. elemId), it is guaranteed that the 0-indexed item of the array will be the element you wish to select, and scrollHeight will be correct.

How can I assign an ID to a view programmatically?

Yes, you can call setId(value) in any view with any (positive) integer value that you like and then find it in the parent container using findViewById(value). Note that it is valid to call setId() with the same value for different sibling views, but findViewById() will return only the first one.

Delete all Duplicate Rows except for One in MySQL?

Editor warning: This solution is computationally inefficient and may bring down your connection for a large table.

NB - You need to do this first on a test copy of your table!

When I did it, I found that unless I also included AND n1.id <> n2.id, it deleted every row in the table.

If you want to keep the row with the lowest id value:

DELETE n1 FROM names n1, names n2 WHERE n1.id > n2.id AND n1.name = n2.name

If you want to keep the row with the highest id value:

DELETE n1 FROM names n1, names n2 WHERE n1.id < n2.id AND n1.name = n2.name

I used this method in MySQL 5.1

Not sure about other versions.

Update: Since people Googling for removing duplicates end up here
Although the OP's question is about DELETE, please be advised that using INSERT and DISTINCT is much faster. For a database with 8 million rows, the below query took 13 minutes, while using DELETE, it took more than 2 hours and yet didn't complete.

INSERT INTO tempTableName(cellId,attributeId,entityRowId,value)
    SELECT DISTINCT cellId,attributeId,entityRowId,value
    FROM tableName;

HTTP error 403 in Python 3 Web Scraping

Based on previous answers this has worked for me with Python 3.7

from urllib.request import Request, urlopen

req = Request('Url_Link', headers={'User-Agent': 'XYZ/3.0'})
webpage = urlopen(req, timeout=10).read()

print(webpage)

How to perform Unwind segue programmatically?

I used [self dismissViewControllerAnimated: YES completion: nil]; which will return you to the calling ViewController.

public static const in TypeScript

Just simply 'export' variable and 'import' in your class

export var GOOGLE_API_URL = 'https://www.googleapis.com/admin/directory/v1';

// default err string message
export var errStringMsg = 'Something went wrong';

Now use it as,

import appConstants = require('../core/AppSettings');
console.log(appConstants.errStringMsg);
console.log(appConstants.GOOGLE_API_URL);

How to determine if one array contains all elements of another array

You can monkey-patch the Array class:

class Array
    def contains_all?(ary)
        ary.uniq.all? { |x| count(x) >= ary.count(x) }
    end
end

test

irb(main):131:0> %w[a b c c].contains_all? %w[a b c]
=> true
irb(main):132:0> %w[a b c c].contains_all? %w[a b c c]
=> true
irb(main):133:0> %w[a b c c].contains_all? %w[a b c c c]
=> false
irb(main):134:0> %w[a b c c].contains_all? %w[a]
=> true
irb(main):135:0> %w[a b c c].contains_all? %w[x]
=> false
irb(main):136:0> %w[a b c c].contains_all? %w[]
=> true
irb(main):137:0> %w[a b c d].contains_all? %w[d c h]
=> false
irb(main):138:0> %w[a b c d].contains_all? %w[d b c]
=> true

Of course the method can be written as a standard-alone method, eg

def contains_all?(a,b)
    b.uniq.all? { |x| a.count(x) >= b.count(x) }
end

and you can invoke it like

contains_all?(%w[a b c c], %w[c c c])

Indeed, after profiling, the following version is much faster, and the code is shorter.

def contains_all?(a,b)
    b.all? { |x| a.count(x) >= b.count(x) }
end

Website screenshots

I'm on Windows so I was able to use the imagegrabwindow function after reading the tip on here from stephan. I added in cropping (to get rid of the Browser header, scroll bars, etc.) and resizing to get a final image. Here's my code. Hope that helps someone.

How to retrieve data from sqlite database in android and display it in TextView

on button click, first open the database, fetch the data and close the data base like this

public class cytaty extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.galeria);

        Button bLosuj = (Button) findViewById(R.id.button1);
        bLosuj.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            myDatabaseHelper = new DatabaseHelper(cytaty.this);
            myDatabaseHelper.openDataBase();

            String text = myDatabaseHelper.getYourData(); //this is the method to query

            myDatabaseHelper.close(); 
            // set text to your TextView
            }
        });
    }
}

and your getYourData() in database class would be like this

public String[] getAppCategoryDetail() {

    final String TABLE_NAME = "name of table";

    String selectQuery = "SELECT  * FROM " + TABLE_NAME;
    SQLiteDatabase db  = this.getReadableDatabase();
    Cursor cursor      = db.rawQuery(selectQuery, null);
    String[] data      = null;

    if (cursor.moveToFirst()) {
        do {
           // get the data into array, or class variable
        } while (cursor.moveToNext());
    }
    cursor.close();
    return data;
}

Implementing a HashMap in C

The best approach depends on the expected key distribution and number of collisions. If relatively few collisions are expected, it really doesn't matter which method is used. If lots of collisions are expected, then which to use depends on the cost of rehashing or probing vs. manipulating the extensible bucket data structure.

But here is source code example of An Hashmap Implementation in C

CardView background color always white

XML code

<android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view_top"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardCornerRadius="5dp"
        app:contentPadding="25dp"
        app:cardBackgroundColor="#e4bfef"
        app:cardElevation="4dp"
        app:cardMaxElevation="6dp" />

From the code

CardView card = findViewById(R.id.card_view_top);
card.setCardBackgroundColor(Color.parseColor("#E6E6E6"));

Running Python code in Vim

I have this on my .vimrc:

"map <F9> :w<CR>:!python %<CR>"

which saves the current buffer and execute the code with presing only Esc + F9

How do I create a timer in WPF?

Adding to the above. You use the Dispatch timer if you want the tick events marshalled back to the UI thread. Otherwise I would use System.Timers.Timer.

Adding a new line/break tag in XML

(Using system.IO)

You can simply use \n for newline and \t in front of the string to indent it.

For example in c#:

public string theXML() {
    string xml = "";
    xml += "<Scene>\n";
    xml += "\t<Character>\n";


    xml += "\t</Character>\n";
    xml += "</Scene>\n";
    return xml;
}

This will result in the output: http://prntscr.com/96dfqc

Entity framework linq query Include() multiple children entities

Might be it will help someone, 4 level and 2 child's on each level

Library.Include(a => a.Library.Select(b => b.Library.Select(c => c.Library)))
            .Include(d=>d.Book.)
            .Include(g => g.Library.Select(h=>g.Book))
            .Include(j => j.Library.Select(k => k.Library.Select(l=>l.Book)))

Why is it said that "HTTP is a stateless protocol"?

Modern HTTP is stateful. Old timey HTTP was stateless.

Before Netscape invented cookies and HTTPS in 1994 http could be considered stateless. As time progressed more and more stateful aspects were added for a myriad of reasons, including performance and security.

While HTTP 1 originally sought out to be stateless many HTTP/2 components are the very definition of stateful. HTTP/2 abandoned stateless goals.

No reasonable person can read the HTTP/2 RFC and think it is stateless. The errant "HTTP is stateless" old time dogma is false and far from the current reality of stateful HTTP.

Here's a limited, and not exhaustive list, of stateful HTTP/1 and HTTP/2 components:

Cookies, named "HTTP State Management Mechanism" by the RFC.
HTTPS, which stores keys thus state.
HTTP authentication requires state.
Web Storage.
HTTP caching is stateful.
The very purpose of the stream identifier is state. It's even in the name of the RFC section, "Stream States".
Header blocks, which establish stream identifiers, are stateful.
Frames which reference stream identifiers are stateful.
Header Compression, which the HTTP RFC explicitly says is stateful, is stateful.
Opportunistic encryption is stateful.

Section 5.1 of the HTTP/2 RFC is a great example of stateful mechanisms defined by the HTTP/2 standard.

Is it safe for web applications to consider HTTP/2 as a stateless protocol?

HTTP/2 is a stateful protocol, but that doesn't mean your HTTP/2 application can't be stateless. You can choose to not use certain stateful features for stateless HTTP/2 applications by using only a subset of HTTP/2 features.

Cookies and some other stateful mechanisms, or less obvious stateful mechanisms, are later HTTP additions. HTTP 1 is said to be stateless although in practice we use standardized stateful mechanisms, like cookies, TLS, and caching. Unlike HTTP/1, HTTP/2 defines stateful components in its standard from the very beginning. A particular HTTP/2 application can use a subset of HTTP/2 features to maintain statelessness, but the protocol itself anticipate state to be the norm, not the exception.

Existing applications, even HTTP 1 applications, needing state will break if trying to use them statelessly. It can be impossible to log into some HTTP/1.1 websites if cookies are disabled, thus breaking the application. It may not be safe to assume that a particular HTTP 1 application does not use state. This is no different for HTTP/2.

Say it with me one last time:

HTTP/2 is a stateful protocol.

How to push local changes to a remote git repository on bitbucket

Use git push origin master instead.

You have a repository locally and the initial git push is "pushing" to it. It's not necessary to do so (as it is local) and it shows everything as up-to-date. git push origin master specifies a a remote repository (origin) and the branch located there (master).

For more information, check out this resource.

XXHDPI and XXXHDPI dimensions in dp for images and icons in android

You can use a vector. Instead of worry about different screen sizes you only need to create an .svg file and import it to your project using Vector Asset Studio.

How to target only IE (any version) within a stylesheet?

For targeting IE only in my stylesheets, I use this Sass Mixin :

@mixin ie-only {
  @media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
    @content;
  }
}

JQuery refresh select box

How to get the current time in YYYY-MM-DD HH:MI:Sec.Millisecond format in Java?

The doc in Java 8 names it fraction-of-second , while in Java 6 was named millisecond. This brought me to confusion

Get text of label with jquery

try document.getElementById('<%=Label1.ClientID%>').text or innerHTML OTHERWISE LOAD JQUERY SCRIPT AND put your code as it is....

Serialize an object to string

Use a StringWriter instead of a StreamWriter:

public static string SerializeObject<T>(this T toSerialize)
{
    XmlSerializer xmlSerializer = new XmlSerializer(toSerialize.GetType());

    using(StringWriter textWriter = new StringWriter())
    {
        xmlSerializer.Serialize(textWriter, toSerialize);
        return textWriter.ToString();
    }
}

Note, it is important to use toSerialize.GetType() instead of typeof(T) in XmlSerializer constructor: if you use the first one the code covers all possible subclasses of T (which are valid for the method), while using the latter one will fail when passing a type derived from T. Here is a link with some example code that motivate this statement, with XmlSerializer throwing an Exception when typeof(T) is used, because you pass an instance of a derived type to a method that calls SerializeObject that is defined in the derived type's base class: http://ideone.com/1Z5J1.

Also, Ideone uses Mono to execute code; the actual Exception you would get using the Microsoft .NET runtime has a different Message than the one shown on Ideone, but it fails just the same.

MVC4 StyleBundle not resolving images

Grinn solution is great.

However it doesn't work for me when there are parent folder relative references in the url. i.e. url('../../images/car.png')

So, I slightly changed the Include method in order to resolve the paths for each regex match, allowing relative paths and also to optionally embed the images in the css.

I also changed the IF DEBUG to check BundleTable.EnableOptimizations instead of HttpContext.Current.IsDebuggingEnabled.

    public new Bundle Include(params string[] virtualPaths)
    {
        if (!BundleTable.EnableOptimizations)
        {
            // Debugging. Bundling will not occur so act normal and no one gets hurt. 
            base.Include(virtualPaths.ToArray());
            return this;
        }
        var bundlePaths = new List<string>();
        var server = HttpContext.Current.Server;
        var pattern = new Regex(@"url\s*\(\s*([""']?)([^:)]+)\1\s*\)", RegexOptions.IgnoreCase);
        foreach (var path in virtualPaths)
        {
            var contents = File.ReadAllText(server.MapPath(path));
            var matches = pattern.Matches(contents);
            // Ignore the file if no matches
            if (matches.Count == 0)
            {
                bundlePaths.Add(path);
                continue;
            }
            var bundlePath = (System.IO.Path.GetDirectoryName(path) ?? string.Empty).Replace(@"\", "/") + "/";
            var bundleUrlPath = VirtualPathUtility.ToAbsolute(bundlePath);
            var bundleFilePath = string.Format("{0}{1}.bundle{2}",
                                               bundlePath,
                                               System.IO.Path.GetFileNameWithoutExtension(path),
                                               System.IO.Path.GetExtension(path));
            // Transform the url (works with relative path to parent folder "../")
            contents = pattern.Replace(contents, m =>
            {
                var relativeUrl = m.Groups[2].Value;
                var urlReplace = GetUrlReplace(bundleUrlPath, relativeUrl, server);
                return string.Format("url({0}{1}{0})", m.Groups[1].Value, urlReplace);
            });
            File.WriteAllText(server.MapPath(bundleFilePath), contents);
            bundlePaths.Add(bundleFilePath);
        }
        base.Include(bundlePaths.ToArray());
        return this;
    }


    private string GetUrlReplace(string bundleUrlPath, string relativeUrl, HttpServerUtility server)
    {
        // Return the absolute uri
        Uri baseUri = new Uri("http://dummy.org");
        var absoluteUrl = new Uri(new Uri(baseUri, bundleUrlPath), relativeUrl).AbsolutePath;
        var localPath = server.MapPath(absoluteUrl);
        if (IsEmbedEnabled && File.Exists(localPath))
        {
            var fi = new FileInfo(localPath);
            if (fi.Length < 0x4000)
            {
                // Embed the image in uri
                string contentType = GetContentType(fi.Extension);
                if (null != contentType)
                {
                    var base64 = Convert.ToBase64String(File.ReadAllBytes(localPath));
                    // Return the serialized image
                    return string.Format("data:{0};base64,{1}", contentType, base64);
                }
            }
        }
        // Return the absolute uri 
        return absoluteUrl;
    }

Hope it helps, regards.

find if an integer exists in a list of integers

You should be referencing Selected not ids.Contains as the last line.

I just realized this is a formatting issue, from the OP. Regardless you should be referencing the value in Selected. I recommend adding some Console.WriteLine calls to see exactly what is being printed out on each line and also what each value is.

After your update: ids is an empty list, how is this not throwing a NullReferenceException? As it was never initialized in that code block

How to loop through a JSON object with typescript (Angular2)

Assuming your json object from your GET request looks like the one you posted above simply do:

let list: string[] = [];

json.Results.forEach(element => {
    list.push(element.Id);
});

Or am I missing something that prevents you from doing it this way?

sorting dictionary python 3

The accepted answer definitely works, but somehow miss an important point.

The OP is asking for a dictionary sorted by it's keys this is just not really possible and not what OrderedDict is doing.

OrderedDict is maintaining the content of the dictionary in insertion order. First item inserted, second item inserted, etc.

>>> d = OrderedDict()
>>> d['foo'] = 1
>>> d['bar'] = 2
>>> d
OrderedDict([('foo', 1), ('bar', 2)])

>>> d = OrderedDict()
>>> d['bar'] = 2
>>> d['foo'] = 1
>>> d
OrderedDict([('bar', 2), ('foo', 1)])

Hencefore I won't really be able to sort the dictionary inplace, but merely to create a new dictionary where insertion order match key order. This is explicit in the accepted answer where the new dictionary is b.

This may be important if you are keeping access to dictionaries through containers. This is also important if you itend to change the dictionary later by adding or removing items: they won't be inserted in key order but at the end of dictionary.

>>> d = OrderedDict({'foo': 5, 'bar': 8})
>>> d
OrderedDict([('foo', 5), ('bar', 8)])
>>> d['alpha'] = 2
>>> d
OrderedDict([('foo', 5), ('bar', 8), ('alpha', 2)])

Now, what does mean having a dictionary sorted by it's keys ? That makes no difference when accessing elements by keys, this only matter when you are iterating over items. Making that a property of the dictionary itself seems like overkill. In many cases it's enough to sort keys() when iterating.

That means that it's equivalent to do:

>>> d = {'foo': 5, 'bar': 8}
>>> for k,v in d.iteritems(): print k, v

on an hypothetical sorted by key dictionary or:

>>> d = {'foo': 5, 'bar': 8}
>>> for k, v in iter((k, d[k]) for k in sorted(d.keys())): print k, v

Of course it is not hard to wrap that behavior in an object by overloading iterators and maintaining a sorted keys list. But it is likely overkill.

Java: recommended solution for deep cloning/copying an instance

I'd suggest to override Object.clone(), call super.clone() first and than call ref = ref.clone() on all references that you want to have deep copied. It's more or less Do it yourself approach but needs a bit less coding.

How to install a specific version of a ruby gem?

Linux

To install different version of ruby, check the latest version of package using apt as below:

$ apt-cache madison ruby
      ruby |    1:1.9.3 | http://ftp.uk.debian.org/debian/ wheezy/main amd64 Packages
      ruby |        4.5 | http://ftp.uk.debian.org/debian/ squeeze/main amd64 Packages

Then install it:

$ sudo apt-get install ruby=1:1.9.3

To check what's the current version, run:

$ gem --version # Check for the current user.
$ sudo gem --version # Check globally.

If the version is still old, you may try to switch the version to new by using ruby version manager (rvm) by:

rvm 1.9.3

Note: You may prefix it by sudo if rvm was installed globally. Or run /usr/local/rvm/scripts/rvm if your command rvm is not in your global PATH. If rvm installation process failed, see the troubleshooting section.

Troubleshooting:

If you still have the old version, you may try to install rvm (ruby version manager) via:

sudo apt-get install curl # Install curl first
curl -sSL https://get.rvm.io | bash -s stable --ruby # Install only for the user.
#or:# curl -sSL https://get.rvm.io | sudo bash -s stable --ruby # Install globally.

then if installed locally (only for current user), load rvm via:

source /usr/local/rvm/scripts/rvm; rvm 1.9.3

if globally (for all users), then:

sudo bash -c "source /usr/local/rvm/scripts/rvm; rvm 1.9.3"

if you still having problem with the new ruby version, try to install it by rvm via:

source /usr/local/rvm/scripts/rvm && rvm install ruby-1.9.3 # Locally.
sudo bash -c "source /usr/local/rvm/scripts/rvm && rvm install ruby-1.9.3" # Globally.

if you'd like to install some gems globally and you have rvm already installed, you may try:
```
rvmsudo gem install [gemname]
```
instead of:
```
  gem install [gemname] # or:
  sudo gem install [gemname]
```

Note: It's prefered to NOT use sudo to work with RVM gems. When you do sudo you are running commands as root, another user in another shell and hence all of the setup that RVM has done for you is ignored while the command runs under sudo (such things as GEM_HOME, etc...). So to reiterate, as soon as you 'sudo' you are running as the root system user which will clear out your environment as well as any files it creates are not able to be modified by your user and will result in strange things happening.

How to check whether an array is empty using PHP?

I ran the benchmark included at the end of the post. To compare the methods:

count($arr) == 0 : count
empty($arr) : empty
$arr == [] : comp
(bool) $arr : cast

and got the following results

Contents  \method |    count     |    empty     |     comp     |     cast     |
------------------|--------------|--------------|--------------|--------------|
            Empty |/* 1.213138 */|/* 1.070011 */|/* 1.628529 */|   1.051795   |
          Uniform |/* 1.206680 */|   1.047339   |/* 1.498836 */|/* 1.052737 */|
          Integer |/* 1.209668 */|/* 1.079858 */|/* 1.486134 */|   1.051138   |
           String |/* 1.242137 */|   1.049148   |/* 1.630259 */|/* 1.056610 */|
            Mixed |/* 1.229072 */|/* 1.068569 */|/* 1.473339 */|   1.064111   |
      Associative |/* 1.206311 */|   1.053642   |/* 1.480637 */|/* 1.137740 */|
------------------|--------------|--------------|--------------|--------------|
            Total |/* 7.307005 */|   6.368568   |/* 9.197733 */|/* 6.414131 */|

The difference between empty and casting to a boolean are insignificant. I've run this test multiple times and they appear to be essentially equivalent. The contents of the arrays do not seem to play a significant role. The two produce the opposite results but the logical negation is barely enough to push casting to winning most of the time so I personally prefer empty for the sake of legibility in either case.

#!/usr/bin/php
<?php

//    012345678
$nt = 90000000;

$arr0 = [];
$arr1 = [];
$arr2 = [];
$arr3 = [];
$arr4 = [];
$arr5 = [];

for ($i = 0; $i < 500000; $i++) {
    $arr1[] = 0;
    $arr2[] = $i;
    $arr3[] = md5($i);
    $arr4[] = $i % 2 ? $i : md5($i);
    $arr5[md5($i)] = $i;
}

$t00 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    count($arr0) == 0;
}
$t01 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    empty($arr0);
}
$t02 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    $arr0 == [];
}
$t03 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    (bool) $arr0;
}
$t04 = microtime(true);

$t10 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    count($arr1) == 0;
}
$t11 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    empty($arr1);
}
$t12 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    $arr1 == [];
}
$t13 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    (bool) $arr1;
}
$t14 = microtime(true);

/* ------------------------------ */

$t20 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    count($arr2) == 0;
}
$t21 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    empty($arr2);
}
$t22 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    $arr2 == [];
}
$t23 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    (bool) $arr2;
}
$t24 = microtime(true);

/* ------------------------------ */

$t30 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    count($arr3) == 0;
}
$t31 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    empty($arr3);
}
$t32 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    $arr3 == [];
}
$t33 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    (bool) $arr3;
}
$t34 = microtime(true);

/* ------------------------------ */

$t40 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    count($arr4) == 0;
}
$t41 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    empty($arr4);
}
$t42 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    $arr4 == [];
}
$t43 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    (bool) $arr4;
}
$t44 = microtime(true);

/* ----------------------------------- */

$t50 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    count($arr5) == 0;
}
$t51 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    empty($arr5);
}
$t52 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    $arr5 == [];
}
$t53 = microtime(true);
for ($i = 0; $i < $nt; $i++) {
    (bool) $arr5;
}
$t54 = microtime(true);

/* ----------------------------------- */

$t60 = $t00 + $t10 + $t20 + $t30 + $t40 + $t50;
$t61 = $t01 + $t11 + $t21 + $t31 + $t41 + $t51;
$t62 = $t02 + $t12 + $t22 + $t32 + $t42 + $t52;
$t63 = $t03 + $t13 + $t23 + $t33 + $t43 + $t53;
$t64 = $t04 + $t14 + $t24 + $t34 + $t44 + $t54;

/* ----------------------------------- */

$ts0[1] = number_format(round($t01 - $t00, 6), 6);
$ts0[2] = number_format(round($t02 - $t01, 6), 6);
$ts0[3] = number_format(round($t03 - $t02, 6), 6);
$ts0[4] = number_format(round($t04 - $t03, 6), 6);

$min_idx = array_keys($ts0, min($ts0))[0];
foreach ($ts0 as $idx => $val) {
    if ($idx == $min_idx) {
        $ts0[$idx] = "   $val   ";
    } else {
        $ts0[$idx] = "/* $val */";
    }

}

$ts1[1] = number_format(round($t11 - $t10, 6), 6);
$ts1[2] = number_format(round($t12 - $t11, 6), 6);
$ts1[3] = number_format(round($t13 - $t12, 6), 6);
$ts1[4] = number_format(round($t14 - $t13, 6), 6);

$min_idx = array_keys($ts1, min($ts1))[0];
foreach ($ts1 as $idx => $val) {
    if ($idx == $min_idx) {
        $ts1[$idx] = "   $val   ";
    } else {
        $ts1[$idx] = "/* $val */";
    }

}

$ts2[1] = number_format(round($t21 - $t20, 6), 6);
$ts2[2] = number_format(round($t22 - $t21, 6), 6);
$ts2[3] = number_format(round($t23 - $t22, 6), 6);
$ts2[4] = number_format(round($t24 - $t23, 6), 6);

$min_idx = array_keys($ts2, min($ts2))[0];
foreach ($ts2 as $idx => $val) {
    if ($idx == $min_idx) {
        $ts2[$idx] = "   $val   ";
    } else {
        $ts2[$idx] = "/* $val */";
    }

}

$ts3[1] = number_format(round($t31 - $t30, 6), 6);
$ts3[2] = number_format(round($t32 - $t31, 6), 6);
$ts3[3] = number_format(round($t33 - $t32, 6), 6);
$ts3[4] = number_format(round($t34 - $t33, 6), 6);

$min_idx = array_keys($ts3, min($ts3))[0];
foreach ($ts3 as $idx => $val) {
    if ($idx == $min_idx) {
        $ts3[$idx] = "   $val   ";
    } else {
        $ts3[$idx] = "/* $val */";
    }

}

$ts4[1] = number_format(round($t41 - $t40, 6), 6);
$ts4[2] = number_format(round($t42 - $t41, 6), 6);
$ts4[3] = number_format(round($t43 - $t42, 6), 6);
$ts4[4] = number_format(round($t44 - $t43, 6), 6);

$min_idx = array_keys($ts4, min($ts4))[0];
foreach ($ts4 as $idx => $val) {
    if ($idx == $min_idx) {
        $ts4[$idx] = "   $val   ";
    } else {
        $ts4[$idx] = "/* $val */";
    }

}

$ts5[1] = number_format(round($t51 - $t50, 6), 6);
$ts5[2] = number_format(round($t52 - $t51, 6), 6);
$ts5[3] = number_format(round($t53 - $t52, 6), 6);
$ts5[4] = number_format(round($t54 - $t53, 6), 6);

$min_idx = array_keys($ts5, min($ts5))[0];
foreach ($ts5 as $idx => $val) {
    if ($idx == $min_idx) {
        $ts5[$idx] = "   $val   ";
    } else {
        $ts5[$idx] = "/* $val */";
    }

}

$ts6[1] = number_format(round($t61 - $t60, 6), 6);
$ts6[2] = number_format(round($t62 - $t61, 6), 6);
$ts6[3] = number_format(round($t63 - $t62, 6), 6);
$ts6[4] = number_format(round($t64 - $t63, 6), 6);

$min_idx = array_keys($ts6, min($ts6))[0];
foreach ($ts6 as $idx => $val) {
    if ($idx == $min_idx) {
        $ts6[$idx] = "   $val   ";
    } else {
        $ts6[$idx] = "/* $val */";
    }

}

echo "             |    count     |    empty     |     comp     |     cast     |\n";
echo "-------------|--------------|--------------|--------------|--------------|\n";
echo "       Empty |";
echo $ts0[1] . '|';
echo $ts0[2] . '|';
echo $ts0[3] . '|';
echo $ts0[4] . "|\n";

echo "     Uniform |";
echo $ts1[1] . '|';
echo $ts1[2] . '|';
echo $ts1[3] . '|';
echo $ts1[4] . "|\n";

echo "     Integer |";
echo $ts2[1] . '|';
echo $ts2[2] . '|';
echo $ts2[3] . '|';
echo $ts2[4] . "|\n";

echo "      String |";
echo $ts3[1] . '|';
echo $ts3[2] . '|';
echo $ts3[3] . '|';
echo $ts3[4] . "|\n";

echo "       Mixed |";
echo $ts4[1] . '|';
echo $ts4[2] . '|';
echo $ts4[3] . '|';
echo $ts4[4] . "|\n";

echo " Associative |";
echo $ts5[1] . '|';
echo $ts5[2] . '|';
echo $ts5[3] . '|';
echo $ts5[4] . "|\n";

echo "-------------|--------------|--------------|--------------|--------------|\n";
echo "       Total |";
echo $ts6[1] . '|';
echo $ts6[2] . '|';
echo $ts6[3] . '|';
echo $ts6[4] . "|\n";

When to use CouchDB over MongoDB and vice versa

Very old question but it's on top of Google and I don't quite like the answers I see so here's my own.

There's much more to Couchdb than the ability to develop CouchApps. Most people use CouchDb in a classical 3-tiers web architecture.

In practice the deciding factor for most people will be the fact that MongoDb allows ad-hoc querying with a SQL like syntax while CouchDb doesn't (you've got to create map/reduce views which turns some people off even though creating these views is Rapid Application Development friendly - they have nothing to do with stored procedures).

To address points raised in the accepted answer : CouchDb has a great versionning system, but it doesn't mean that it is only suited (or more suited) for places where versionning is important. Also, couchdb is heavy-write friendly thanks to its append-only nature (writes operations return in no time while guaranteeing that no data will ever be lost).

One very important thing that is not mentioned by anyone is the fact that CouchDb relies on b-tree indexes. This means that whether you have 1 "row" or 20 billions, the querying time will always remain below 10ms. This is a game changer which makes CouchDb a low-latency and read-friendly database, and this really shouldn't be overlooked.

To be fair and exhaustive the advantage MongoDb has over CouchDb is tooling and marketing. They have first-class citizen tools for all major languages and platforms making the on-boarding easy and this added to their adhoc querying makes the transition from SQL even easier.

CouchDb doesn't have this level of tooling - even though there are many libraries available today - but CouchDb is exposed as an HTTP API and it is therefore quite easy to create a wrapper in your favorite language to talk with it. I personally like this approach as it avoids bloat and allows you to only take what you want (interface segregation principle).

So I'd say using one or the other is largely a matter of comfort and preference with their paradigms. CouchDb approach "just fits", for certain people, but if after learning about the database features (in the exhaustive official guide) you don't have your "hell yeah" moment, you should probably move on.

I'd discourage using CouchDb if you just want to use "the right tool for the right job". because you'll find out that you can't just use it that way and you'll end up being pissed and writing blog posts such as "Where are joins in CouchDb ?" and "Where is transaction management ?". Indeed Couchdb is - paradoxically - very transparent but at the same time requires a paradigm shift and a change in the way you approach problems to really shine (and really work).

But once you've done that it really pays off. I'd personally need very strong reasons or a major deal breaker on a project to choose another database, but so far I haven't met any.

Linq to Entities join vs groupjoin

Behaviour

Suppose you have two lists:

Id  Value
1   A
2   B
3   C

Id  ChildValue
1   a1
1   a2
1   a3
2   b1
2   b2

When you Join the two lists on the Id field the result will be:

Value ChildValue
A     a1
A     a2
A     a3
B     b1
B     b2

When you GroupJoin the two lists on the Id field the result will be:

Value  ChildValues
A      [a1, a2, a3]
B      [b1, b2]
C      []

So Join produces a flat (tabular) result of parent and child values.
GroupJoin produces a list of entries in the first list, each with a group of joined entries in the second list.

That's why Join is the equivalent of INNER JOIN in SQL: there are no entries for C. While GroupJoin is the equivalent of OUTER JOIN: C is in the result set, but with an empty list of related entries (in an SQL result set there would be a row C - null).

Syntax

So let the two lists be IEnumerable<Parent> and IEnumerable<Child> respectively. (In case of Linq to Entities: IQueryable<T>).

Join syntax would be

from p in Parent
join c in Child on p.Id equals c.Id
select new { p.Value, c.ChildValue }

returning an IEnumerable<X> where X is an anonymous type with two properties, Value and ChildValue. This query syntax uses the Join method under the hood.

GroupJoin syntax would be

from p in Parent
join c in Child on p.Id equals c.Id into g
select new { Parent = p, Children = g }

returning an IEnumerable<Y> where Y is an anonymous type consisting of one property of type Parent and a property of type IEnumerable<Child>. This query syntax uses the GroupJoin method under the hood.

We could just do select g in the latter query, which would select an IEnumerable<IEnumerable<Child>>, say a list of lists. In many cases the select with the parent included is more useful.

Some use cases

1. Producing a flat outer join.

As said, the statement ...

from p in Parent
join c in Child on p.Id equals c.Id into g
select new { Parent = p, Children = g }

... produces a list of parents with child groups. This can be turned into a flat list of parent-child pairs by two small additions:

from p in parents
join c in children on p.Id equals c.Id into g // <= into
from c in g.DefaultIfEmpty()               // <= flattens the groups
select new { Parent = p.Value, Child = c?.ChildValue }

The result is similar to

Value Child
A     a1
A     a2
A     a3
B     b1
B     b2
C     (null)

Note that the range variable c is reused in the above statement. Doing this, any join statement can simply be converted to an outer join by adding the equivalent of into g from c in g.DefaultIfEmpty() to an existing join statement.

This is where query (or comprehensive) syntax shines. Method (or fluent) syntax shows what really happens, but it's hard to write:

parents.GroupJoin(children, p => p.Id, c => c.Id, (p, c) => new { p, c })
       .SelectMany(x => x.c.DefaultIfEmpty(), (x,c) => new { x.p.Value, c?.ChildValue } )

So a flat outer join in LINQ is a GroupJoin, flattened by SelectMany.

2. Preserving order

Suppose the list of parents is a bit longer. Some UI produces a list of selected parents as Id values in a fixed order. Let's use:

var ids = new[] { 3,7,2,4 };

Now the selected parents must be filtered from the parents list in this exact order.

If we do ...

var result = parents.Where(p => ids.Contains(p.Id));

... the order of parents will determine the result. If the parents are ordered by Id, the result will be parents 2, 3, 4, 7. Not good. However, we can also use join to filter the list. And by using ids as first list, the order will be preserved:

from id in ids
join p in parents on id equals p.Id
select p

The result is parents 3, 7, 2, 4.

Numpy Resize/Rescale Image

Yeah, you can install opencv (this is a library used for image processing, and computer vision), and use the cv2.resize function. And for instance use:

import cv2
import numpy as np

img = cv2.imread('your_image.jpg')
res = cv2.resize(img, dsize=(54, 140), interpolation=cv2.INTER_CUBIC)

Here img is thus a numpy array containing the original image, whereas res is a numpy array containing the resized image. An important aspect is the interpolation parameter: there are several ways how to resize an image. Especially since you scale down the image, and the size of the original image is not a multiple of the size of the resized image. Possible interpolation schemas are:

INTER_NEAREST - a nearest-neighbor interpolation

INTER_LINEAR - a bilinear interpolation (used by default)

INTER_AREA - resampling using pixel area relation. It may be a preferred method for image decimation, as it gives moire’-free results. But when the image is zoomed, it is similar to the INTER_NEAREST method.

INTER_CUBIC - a bicubic interpolation over 4x4 pixel neighborhood

INTER_LANCZOS4 - a Lanczos interpolation over 8x8 pixel neighborhood

Like with most options, there is no "best" option in the sense that for every resize schema, there are scenarios where one strategy can be preferred over another.

HTML <select> selected option background-color CSS style

You may not be able to do this using pure CSS. But, a little javascript can do it nicely.

A crude way to do it -

var sel = document.getElementById('select_id');
sel.addEventListener('click', function(el){
    var options = this.children;
    for(var i=0; i < this.childElementCount; i++){
        options[i].style.color = 'white';
    }
    var selected = this.children[this.selectedIndex];
        selected.style.color = 'red';
    }, false);

How to convert an IPv4 address into a integer in C#?

Try this ones:

private int IpToInt32(string ipAddress)
{
   return BitConverter.ToInt32(IPAddress.Parse(ipAddress).GetAddressBytes().Reverse().ToArray(), 0);
}

private string Int32ToIp(int ipAddress)
{
   return new IPAddress(BitConverter.GetBytes(ipAddress).Reverse().ToArray()).ToString();
}

Google maps API V3 method fitBounds()

This happens because LatLngBounds() does not take two arbitrary points as parameters, but SW and NE points

use the .extend() method on an empty bounds object

var bounds = new google.maps.LatLngBounds();
bounds.extend(myPlace);
bounds.extend(Item_1);
map.fitBounds(bounds);

Demo at http://jsfiddle.net/gaby/22qte/

how to display data values on Chart.js

Edited @ajhuddy's answer a little. Only for bar charts. My version adds:

Fade in animation for the values.
Prevent clipping by positioning the value inside the bar if the bar is too high.
No blinking.

Downside: When hovering over a bar that has value inside it the value might look a little jagged. I have not found a solution do disable hover effects. It might also need tweaking depending on your own settings.

Configuration:

bar: {
  tooltips: {
    enabled: false
  },
  hover: {
    animationDuration: 0
  },
  animation: {
    onComplete: function() {
      this.chart.controller.draw();
      drawValue(this, 1);
    },
    onProgress: function(state) {
      var animation = state.animationObject;
      drawValue(this, animation.currentStep / animation.numSteps);
    }
  }
}

Helpers:

// Font color for values inside the bar
var insideFontColor = '255,255,255';
// Font color for values above the bar
var outsideFontColor = '0,0,0';
// How close to the top edge bar can be before the value is put inside it
var topThreshold = 20;

var modifyCtx = function(ctx) {
  ctx.font = Chart.helpers.fontString(Chart.defaults.global.defaultFontSize, 'normal', Chart.defaults.global.defaultFontFamily);
  ctx.textAlign = 'center';
  ctx.textBaseline = 'bottom';
  return ctx;
};

var fadeIn = function(ctx, obj, x, y, black, step) {
  var ctx = modifyCtx(ctx);
  var alpha = 0;
  ctx.fillStyle = black ? 'rgba(' + outsideFontColor + ',' + step + ')' : 'rgba(' + insideFontColor + ',' + step + ')';
  ctx.fillText(obj, x, y);
};

var drawValue = function(context, step) {
  var ctx = context.chart.ctx;

  context.data.datasets.forEach(function (dataset) {
    for (var i = 0; i < dataset.data.length; i++) {
      var model = dataset._meta[Object.keys(dataset._meta)[0]].data[i]._model;
      var textY = (model.y > topThreshold) ? model.y - 3 : model.y + 20;
      fadeIn(ctx, dataset.data[i], model.x, textY, model.y > topThreshold, step);
    }
  });
};

How to implement LIMIT with SQL Server?

better use this in MSSQLExpress 2017.

SELECT * FROM
(
    SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 0)) as [Count], * FROM table1
) as a
WHERE [Count] BETWEEN 10 and 20;

--Giving a Column [Count] and assigning every row a unique counting without ordering something then re select again where you can provide your limits.. :)

Multiple radio button groups in one form

in input field make name same like

<input type="radio" name="option" value="option1">
<input type="radio" name="option" value="option2" >
<input type="radio" name="option" value="option3" >
<input type="radio" name="option" value="option3" >

Converting a pointer into an integer

Use intptr_t and uintptr_t.

To ensure it is defined in a portable way, you can use code like this:

#if defined(__BORLANDC__)
    typedef unsigned char uint8_t;
    typedef __int64 int64_t;
    typedef unsigned long uintptr_t;
#elif defined(_MSC_VER)
    typedef unsigned char uint8_t;
    typedef __int64 int64_t;
#else
    #include <stdint.h>
#endif

Just place that in some .h file and include wherever you need it.

Alternatively, you can download Microsoft’s version of the stdint.h file from here or use a portable one from here.

Time calculation in php (add 10 hours)?

$tz = new DateTimeZone('Europe/London');
$date = new DateTime($today, $tz);
$date->modify('+10 hours');
// use $date->format() to outputs the result.

see DateTime Class (PHP 5 >= 5.2.0)

Single huge .css file vs. multiple smaller specific .css files?

A CSS compiler like Sass or LESS is a great way to go. That way you'll be able to deliver a single, minimised CSS file for the site (which will be far smaller and faster than a normal single CSS source file), while maintaining the nicest development environment, with everything neatly split into components.

Sass and LESS have the added advantage of variables, nesting and other ways to make CSS easier to write and maintain. Highly, highly recommended. I personally use Sass (SCSS syntax) now, but used LESS previously. Both are great, with similar benefits. Once you've written CSS with a compiler, it's unlikely you'd want to do without one.

http://lesscss.org

http://sass-lang.com

If you don't want to mess around with Ruby, this LESS compiler for Mac is great:

http://incident57.com/less/

Or you could use CodeKit (by the same guys):

http://incident57.com/codekit/

WinLess is a Windows GUI for comipiling LESS

http://winless.org/

How do you create a custom AuthorizeAttribute in ASP.NET Core?

What is the current approach to make a custom AuthorizeAttribute

Easy: don't create your own AuthorizeAttribute.

For pure authorization scenarios (like restricting access to specific users only), the recommended approach is to use the new authorization block: https://github.com/aspnet/MusicStore/blob/1c0aeb08bb1ebd846726232226279bbe001782e1/samples/MusicStore/Startup.cs#L84-L92

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<AuthorizationOptions>(options =>
        {
            options.AddPolicy("ManageStore", policy => policy.RequireClaim("Action", "ManageStore"));
        });
    }
}

public class StoreController : Controller
{
    [Authorize(Policy = "ManageStore"), HttpGet]
    public async Task<IActionResult> Manage() { ... }
}

For authentication, it's best handled at the middleware level.

What are you trying to achieve exactly?

How to import JsonConvert in C# application?

After instaling the package you need to add the newtonsoft.json.dll into assemble path by runing the flowing command.

Before we can use our assembly, we have to add it to the global assembly cache (GAC). Open the Visual Studio 2008 Command Prompt again (for Vista/Windows7/etc. open it as Administrator). And execute the following command. gacutil /i d:\myMethodsForSSIS\myMethodsForSSIS\bin\Release\myMethodsForSSIS.dll

flow this link for more informATION http://microsoft-ssis.blogspot.com/2011/05/referencing-custom-assembly-inside.html

Why is it OK to return a 'vector' from a function?

To well understand the behaviour, you can run this code:

#include <iostream>

class MyClass
{
  public:
    MyClass() { std::cout << "run constructor MyClass::MyClass()" << std::endl; }
    ~MyClass() { std::cout << "run destructor MyClass::~MyClass()" << std::endl; }
    MyClass(const MyClass& x) { std::cout << "run copy constructor MyClass::MyClass(const MyClass&)" << std::endl; }
    MyClass& operator = (const MyClass& x) { std::cout << "run assignation MyClass::operator=(const MyClass&)" << std::endl; }
};

MyClass my_function()
{
  std::cout << "run my_function()" << std::endl;
  MyClass a;
  std::cout << "my_function is going to return a..." << std::endl;
  return a;
}

int main(int argc, char** argv)
{
  MyClass b = my_function();

  MyClass c;
  c = my_function();

  return 0;
}

The output is the following:

run my_function()
run constructor MyClass::MyClass()
my_function is going to return a...
run constructor MyClass::MyClass()
run my_function()
run constructor MyClass::MyClass()
my_function is going to return a...
run assignation MyClass::operator=(const MyClass&)
run destructor MyClass::~MyClass()
run destructor MyClass::~MyClass()
run destructor MyClass::~MyClass()

Note that this example was provided in C++03 context, it could be improved for C++ >= 11

Install dependencies globally and locally using package.json

This is a bit old but I ran into the requirement so here is the solution I came up with.

The Problem:

Our development team maintains many .NET web application products we are migrating to AngularJS/Bootstrap. VS2010 does not lend itself easily to custom build processes and my developers are routinely working on multiple releases of our products. Our VCS is Subversion (I know, I know. I'm trying to move to Git but my pesky marketing staff is so demanding) and a single VS solution will include several separate projects. I needed my staff to have a common method for initializing their development environment without having to install the same Node packages (gulp, bower, etc.) several times on the same machine.

TL;DR:

Need "npm install" to install the global Node/Bower development environment as well as all locally required packages for a .NET product.
Global packages should be installed only if not already installed.
Local links to global packages must be created automatically.

The Solution:

We already have a common development framework shared by all developers and all products so I created a NodeJS script to install the global packages when needed and create the local links. The script resides in "....\SharedFiles" relative to the product base folder:

/*******************************************************************************
* $Id: npm-setup.js 12785 2016-01-29 16:34:49Z sthames $
* ==============================================================================
* Parameters: 'links' - Create links in local environment, optional.
* 
* <p>NodeJS script to install common development environment packages in global
* environment. <c>packages</c> object contains list of packages to install.</p>
* 
* <p>Including 'links' creates links in local environment to global packages.</p>
* 
* <p><b>npm ls -g --json</b> command is run to provide the current list of 
* global packages for comparison to required packages. Packages are installed 
* only if not installed. If the package is installed but is not the required 
* package version, the existing package is removed and the required package is 
* installed.</p>.
*
* <p>When provided as a "preinstall" script in a "package.json" file, the "npm
* install" command calls this to verify global dependencies are installed.</p>
*******************************************************************************/
var exec = require('child_process').exec;
var fs   = require('fs');
var path = require('path');

/*---------------------------------------------------------------*/
/* List of packages to install and 'from' value to pass to 'npm  */
/* install'. Value must match the 'from' field in 'npm ls -json' */
/* so this script will recognize a package is already installed. */
/*---------------------------------------------------------------*/
var packages = 
  {
  "bower"                      :                      "[email protected]", 
  "event-stream"               :               "[email protected]",
  "gulp"                       :                       "[email protected]",
  "gulp-angular-templatecache" : "[email protected]",
  "gulp-clean"                 :                 "[email protected]", 
  "gulp-concat"                :                "[email protected]",
  "gulp-debug"                 :                 "[email protected]",
  "gulp-filter"                :                "[email protected]",
  "gulp-grep-contents"         :         "[email protected]",
  "gulp-if"                    :                    "[email protected]", 
  "gulp-inject"                :                "[email protected]", 
  "gulp-minify-css"            :            "[email protected]",
  "gulp-minify-html"           :           "[email protected]",
  "gulp-minify-inline"         :         "[email protected]",
  "gulp-ng-annotate"           :           "[email protected]",
  "gulp-processhtml"           :           "[email protected]",
  "gulp-rev"                   :                   "[email protected]",
  "gulp-rev-replace"           :           "[email protected]",
  "gulp-uglify"                :                "[email protected]",
  "gulp-useref"                :                "[email protected]",
  "gulp-util"                  :                  "[email protected]",
  "lazypipe"                   :                   "[email protected]",
  "q"                          :                          "[email protected]",
  "through2"                   :                   "[email protected]",

  /*---------------------------------------------------------------*/
  /* fork of 0.2.14 allows passing parameters to main-bower-files. */
  /*---------------------------------------------------------------*/
  "bower-main"                 : "git+https://github.com/Pyo25/bower-main.git" 
  }

/*******************************************************************************
* run */
/**
* Executes <c>cmd</c> in the shell and calls <c>cb</c> on success. Error aborts.
* 
* Note: Error code -4082 is EBUSY error which is sometimes thrown by npm for 
* reasons unknown. Possibly this is due to antivirus program scanning the file 
* but it sometimes happens in cases where an antivirus program does not explain 
* it. The error generally will not happen a second time so this method will call 
* itself to try the command again if the EBUSY error occurs.
* 
* @param  cmd  Command to execute.
* @param  cb   Method to call on success. Text returned from stdout is input.
*******************************************************************************/
var run = function(cmd, cb)
  {
  /*---------------------------------------------*/
  /* Increase the maxBuffer to 10MB for commands */
  /* with a lot of output. This is not necessary */
  /* with spawn but it has other issues.         */
  /*---------------------------------------------*/
  exec(cmd, { maxBuffer: 1000*1024 }, function(err, stdout)
    {
    if      (!err)                   cb(stdout);
    else if (err.code | 0 == -4082) run(cmd, cb);
    else throw err;
    });
  };

/*******************************************************************************
* runCommand */
/**
* Logs the command and calls <c>run</c>.
*******************************************************************************/
var runCommand = function(cmd, cb)
  {
  console.log(cmd);
  run(cmd, cb);
  }

/*******************************************************************************
* Main line
*******************************************************************************/
var doLinks  = (process.argv[2] || "").toLowerCase() == 'links';
var names    = Object.keys(packages);
var name;
var installed;
var links;

/*------------------------------------------*/
/* Get the list of installed packages for   */
/* version comparison and install packages. */
/*------------------------------------------*/
console.log('Configuring global Node environment...')
run('npm ls -g --json', function(stdout)
  {
  installed = JSON.parse(stdout).dependencies || {};
  doWhile();
  });

/*--------------------------------------------*/
/* Start of asynchronous package installation */
/* loop. Do until all packages installed.     */
/*--------------------------------------------*/
var doWhile = function()
  {
  if (name = names.shift())
    doWhile0();
  }

var doWhile0 = function()
  {
  /*----------------------------------------------*/
  /* Installed package specification comes from   */
  /* 'from' field of installed packages. Required */
  /* specification comes from the packages list.  */
  /*----------------------------------------------*/
  var current  = (installed[name] || {}).from;
  var required =   packages[name];

  /*---------------------------------------*/
  /* Install the package if not installed. */
  /*---------------------------------------*/
  if (!current)
    runCommand('npm install -g '+required, doWhile1);

  /*------------------------------------*/
  /* If the installed version does not  */
  /* match, uninstall and then install. */
  /*------------------------------------*/
  else if (current != required)
    {
    delete installed[name];
    runCommand('npm remove -g '+name, function() 
      {
      runCommand('npm remove '+name, doWhile0);
      });
    }

  /*------------------------------------*/
  /* Skip package if already installed. */
  /*------------------------------------*/
  else
    doWhile1();
  };

var doWhile1 = function()
  {
  /*-------------------------------------------------------*/
  /* Create link to global package from local environment. */
  /*-------------------------------------------------------*/
  if (doLinks && !fs.existsSync(path.join('node_modules', name)))
    runCommand('npm link '+name, doWhile);
  else
    doWhile();
  };

Now if I want to update a global tool for our developers, I update the "packages" object and check in the new script. My developers check it out and either run it with "node npm-setup.js" or by "npm install" from any of the products under development to update the global environment. The whole thing takes 5 minutes.

In addition, to configure the environment for the a new developer, they must first only install NodeJS and GIT for Windows, reboot their computer, check out the "Shared Files" folder and any products under development, and start working.

The "package.json" for the .NET product calls this script prior to install:

{ 
"name"                    : "Books",
"description"             : "Node (npm) configuration for Books Database Web Application Tools",
"version"                 : "2.1.1",
"private"                 : true,
"scripts":
  {
  "preinstall"            : "node ../../SharedFiles/npm-setup.js links",
  "postinstall"           : "bower install"
  },
"dependencies": {}
}

Notes

Note the script reference requires forward slashes even in a Windows environment.
"npm ls" will give "npm ERR! extraneous:" messages for all packages locally linked because they are not listed in the "package.json" "dependencies".

Edit 1/29/16

The updated npm-setup.js script above has been modified as follows:

Package "version" in var packages is now the "package" value passed to npm install on the command line. This was changed to allow for installing packages from somewhere other than the registered repository.
If the package is already installed but is not the one requested, the existing package is removed and the correct one installed.
For reasons unknown, npm will periodically throw an EBUSY error (-4082) when performing an install or link. This error is trapped and the command re-executed. The error rarely happens a second time and seems to always clear up.

How to enable TLS 1.2 support in an Android application (running on Android 4.1 JB)

2 ways to enable TLSv1.1 and TLSv1.2:

use this guideline: http://blog.dev-area.net/2015/08/13/android-4-1-enable-tls-1-1-and-tls-1-2/
use this class https://github.com/erickok/transdroid/blob/master/app/src/main/java/org/transdroid/daemon/util/TlsSniSocketFactory.java
schemeRegistry.register(new Scheme("https", new TlsSniSocketFactory(), port));

How to execute a .bat file from a C# windows form app?

For the problem you're having about the batch file asking the user if the destination is a folder or file, if you know the answer in advance, you can do as such:

If destination is a file: echo f | [batch file path]

If folder: echo d | [batch file path]

It will essentially just pipe the letter after "echo" to the input of the batch file.

Accessing Websites through a Different Port?

To clarify earlier answers, the HTTP protocol is 'registered' with port 80, and HTTP over SSL (aka HTTPS) is registered with port 443.

Well known port numbers are documented by IANA.

If you mean "bypass logging software" on the web server, no. It will see the traffic coming from you through the proxy system's IP address, at least. If you're trying to circumvent controls put into place by your IT department, then you need to rethink this. If your IT department blocks traffic to port 80, 8080 or 443 anywhere outbound, there is a reason. Ask your IT director. If you need access to these ports outbound from your local workstation to do your job, make your case with them.

Installing a proxy server, or using a free proxy service, may be a violation of company policies and could put your employment at risk.

Difference between map, applymap and apply methods in Pandas

@jeremiahbuddha mentioned that apply works on row/columns, while applymap works element-wise. But it seems you can still use apply for element-wise computation....

frame.apply(np.sqrt)
Out[102]: 
               b         d         e
Utah         NaN  1.435159       NaN
Ohio    1.098164  0.510594  0.729748
Texas        NaN  0.456436  0.697337
Oregon  0.359079       NaN       NaN

frame.applymap(np.sqrt)
Out[103]: 
               b         d         e
Utah         NaN  1.435159       NaN
Ohio    1.098164  0.510594  0.729748
Texas        NaN  0.456436  0.697337
Oregon  0.359079       NaN       NaN

ASP.NET email validator regex

E-mail addresses are very difficult to verify correctly with a mere regex. Here is a pretty scary regex that supposedly implements RFC822, chapter 6, the specification of valid e-mail addresses.

Not really an answer, but maybe related to what you're trying to accomplish.

Center a button in a Linear layout

If you want to center an item in the middle of the screen don't use a LinearLayout as these are meant for displaying a number of items in a row.

Use a RelativeLayout instead.

So replace:

android:layout_gravity="center_vertical|center_horizontal"

for the relevant RelativeLayout option:

android:layout_centerInParent="true"

So your layout file will look like this:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/RelativeLayout01" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageButton android:id="@+id/btnFindMe" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:background="@drawable/findme"></ImageButton>

</RelativeLayout>

Regex: Specify "space or start of string" and "space or end of string"

\b matches at word boundaries (without actually matching any characters), so the following should do what you want:

\bstackoverflow\b

Programs & Examples On #Microdata