how to bind datatable to datagridview in c#

Try this:

    ServersTable.Columns.Clear();
    ServersTable.DataSource = SBind;

If you don't want to clear all the existing columns, you have to set DataPropertyName for each existing column like this:

for (int i = 0; i < ServersTable.ColumnCount; ++i) {
  DTable.Columns.Add(new DataColumn(ServersTable.Columns[i].Name));
  ServersTable.Columns[i].DataPropertyName = ServersTable.Columns[i].Name;
}

How can jQuery deferred be used?

The answer by ehynds will not work, because it caches the responses data. It should cache the jqXHR which is also a Promise. Here is the correct code:

var cache = {};

function getData( val ){

    // return either the cached value or an
    // jqXHR object (which contains a promise)
    return cache[ val ] || $.ajax('/foo/', {
        data: { value: val },
        dataType: 'json',
        success: function(data, textStatus, jqXHR){
            cache[ val ] = jqXHR;
        }
    });
}

getData('foo').then(function(resp){
    // do something with the response, which may
    // or may not have been retreived using an
    // XHR request.
});

The answer by Julian D. will work correct and is a better solution.

Convert Enum to String

Enum.GetName()

Format() is really just a wrapper around GetName() with some formatting functionality (or InternalGetValueAsString() to be exact). ToString() is pretty much the same as Format(). I think GetName() is best option since it's totally obvious what it does for anyone who reads the source.

how to convert a string to a bool

Here's my attempt at the most forgiving string to bool conversion that is still useful, basically keying off only the first character.

public static class StringHelpers
{
    /// <summary>
    /// Convert string to boolean, in a forgiving way.
    /// </summary>
    /// <param name="stringVal">String that should either be "True", "False", "Yes", "No", "T", "F", "Y", "N", "1", "0"</param>
    /// <returns>If the trimmed string is any of the legal values that can be construed as "true", it returns true; False otherwise;</returns>
    public static bool ToBoolFuzzy(this string stringVal)
    {
        string normalizedString = (stringVal?.Trim() ?? "false").ToLowerInvariant();
        bool result = (normalizedString.StartsWith("y") 
            || normalizedString.StartsWith("t")
            || normalizedString.StartsWith("1"));
        return result;
    }
}

Creating a textarea with auto-resize

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Textarea autoresize</title>
    <style>
    textarea {
        overflow: hidden;
    }
    </style>
    <script>
    function resizeTextarea(ev) {
        this.style.height = '24px';
        this.style.height = this.scrollHeight + 12 + 'px';
    }

    var te = document.querySelector('textarea');
    te.addEventListener('input', resizeTextarea);
    </script>
</head>
<body>
    <textarea></textarea>
</body>
</html>

Tested in Firefox 14 and Chromium 18. The numbers 24 and 12 are arbitrary, test to see what suits you best.

You could do without the style and script tags, but it becomes a bit messy imho (this is old style HTML+JS and is not encouraged).

<textarea style="overflow: hidden" onkeyup="this.style.height='24px'; this.style.height = this.scrollHeight + 12 + 'px';"></textarea>

Edit: modernized code. Changed onkeyup attribute to addEventListener.
Edit: keydown works better than keyup
Edit: declare function before using
Edit: input works better than keydown (thnx @WASD42 & @MA-Maddin)

jsfiddle

How to change the icon of an Android app in Eclipse?

In your AndroidManifest.xml file

<application
        android:name="ApplicationClass"
        android:icon="@drawable/ic_launcher"  <--------
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

Redirect to Action by parameter mvc

This error is very non-descriptive but the key here is that 'ID' is in uppercase. This indicates that the route has not been correctly set up. To let the application handle URLs with an id, you need to make sure that there's at least one route configured for it. You do this in the RouteConfig.cs located in the App_Start folder. The most common is to add the id as an optional parameter to the default route.

public static void RegisterRoutes(RouteCollection routes)
{
    //adding the {id} and setting is as optional so that you do not need to use it for every action
    routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
    );
}

Now you should be able to redirect to your controller the way you have set it up.

[HttpPost]
public ActionResult RedirectToImages(int id)
{
    return RedirectToAction("Index","ProductImageManager", new { id });

    //if the action is in the same controller, you can omit the controller:
    //RedirectToAction("Index", new { id });
}

In one or two occassions way back I ran into some issues by normal redirect and had to resort to doing it by passing a RouteValueDictionary. More information on RedirectToAction with parameter

return RedirectToAction("Index", new RouteValueDictionary( 
    new { controller = "ProductImageManager", action = "Index", id = id } ) 
);

If you get a very similar error but in lowercase 'id', this is usually because the route expects an id parameter that has not been provided (calling a route without the id /ProductImageManager/Index). See this so question for more information.

Loading existing .html file with android WebView

paste your .html file in assets folder of your project folder. and create an xml file in layout folder with the fol code: my.xml:

<WebView  xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/webview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
    />

add fol code in activity

setContentView(R.layout.my);
    WebView mWebView = null;
    mWebView = (WebView) findViewById(R.id.webview);
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.loadUrl("file:///android_asset/new.html"); //new.html is html file name.

How to convert integer to decimal in SQL Server query?

declare @xx int 
set     @xx = 3 
select @xx      
select @xx * 2  -- yields another integer  
select @xx/1    -- same
select @xx/1.0  --yields 6 decimal places 
select @xx/1.00 --       6 
select @xx * 1.0  --     1 decimal place - victory
select @xx * 1.00 --     2         places - hooray

Also _ inserting an int into a temp_table with like decimal(10,3) _ works ok.

imagecreatefromjpeg and similar functions are not working in PHP

Install GD Library

Which OS you are using?

http://php.net/manual/en/image.installation.php

Windows http://www.dmxzone.com/go/5001/how-do-i-install-gd-in-windows/

Linux http://www.cyberciti.biz/faq/ubuntu-linux-install-or-add-php-gd-support-to-apache/

How to use NULL or empty string in SQL

my best solution :

 WHERE  
 COALESCE(char_length(fieldValue), 0) = 0

COALESCE returns the first non-null expr in the expression list().

if the fieldValue is null or empty string then: we will return the second element then 0.

so 0 is equal to 0 then this fieldValue is a null or empty string.

in python for exemple:

def coalesce(fieldValue):
    if fieldValue in (null,''):
        return 0

good luck

Finding the position of bottom of a div with jquery

var top = ($('#bottom').position().top) + ($('#bottom').height());

Gridview with two columns and auto resized images

another simple approach with modern built-in stuff like PercentRelativeLayout is now available for new users who hit this problem. thanks to android team for release this item.

<android.support.percent.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
app:layout_widthPercent="50%">

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/picture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="#55000000"
        android:paddingBottom="15dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="15dp"
        android:textColor="@android:color/white" />

</FrameLayout>

and for better performance you can use some stuff like picasso image loader which help you to fill whole width of every image parents. for example in your adapter you should use this:

int width= context.getResources().getDisplayMetrics().widthPixels;
    com.squareup.picasso.Picasso
            .with(context)
            .load("some url")
            .centerCrop().resize(width/2,width/2)
            .error(R.drawable.placeholder)
            .placeholder(R.drawable.placeholder)
            .into(item.drawableId);

now you dont need CustomImageView Class anymore.

P.S i recommend to use ImageView in place of Type Int in class Item.

hope this help..

Android: Is it possible to display video thumbnails?

I am answering this question late but hope it will help the other candidate facing same problem.

I have used two methods to load thumbnail for videos list the first was

    Bitmap bmThumbnail;
    bmThumbnail = ThumbnailUtils.createVideoThumbnail(FILE_PATH
                    + videoList.get(position),
            MediaStore.Video.Thumbnails.MINI_KIND);

    if (bmThumbnail != null) {
        Log.d("VideoAdapter","video thumbnail found");
        holder.imgVideo.setImageBitmap(bmThumbnail);
    } else {
        Log.d("VideoAdapter","video thumbnail not found");
    }

its look good but there was a problem with this solution because when i scroll video list it will freeze some time due to its large processing.

so after this i found another solution which works perfectly by using Glide Library.

 Glide
            .with( mContext )
            .load( Uri.fromFile( new File( FILE_PATH+videoList.get(position) ) ) )
            .into( holder.imgVideo );

I recommended the later solution for showing thumbnail with video list . thanks

Convert String[] to comma separated string in java

here is a Utility method to split an array and put your custom delimiter, using

String.replace(String,String)
Arrays.toString(Object[])

here it is :

public static String toString(String delimiter, Object[]array){
    String s = "";

    // split array
    if (array != null && array.length > 0) {
        s = Arrays.toString(array).replace("[", "").replace("]", "");
    }

    // place delimiter (notice the space in ", ")
    if(delimiter != null){
        s = s.replace(", ", delimiter);
    }

    return s;
}

change the second argument type to suite your array type

When I run `npm install`, it returns with `ERR! code EINTEGRITY` (npm 5.3.0)

As a workaround, follow the below steps:

Go to the project directory
Remove the node_modules directory: rm -rf node_modules
Remove package-lock.json file: rm package-lock.json
Clear the cache: npm cache clean --force
Run npm install --verbose If after following the above steps still the issue exists then please provide us the output of installation command with --verbose.

Display calendar to pick a date in java

Open your Java source code document and navigate to the JTable object you have created inside of your Swing class.
Create a new TableModel object that holds a DatePickerTable. You must create the DatePickerTable with a range of date values in MMDDYYYY format. The first value is the begin date and the last is the end date. In code, this looks like:
```
TableModel datePicker = new DatePickerTable("01011999","12302000");
```
Set the display interval in the datePicker object. By default each day is displayed, but you may set a regular interval. To set a 15-day interval between date options, use this code:
```
datePicker.interval = 15;
```
Attach your table model into your JTable:
```
JTable newtable = new JTable (datePicker);
```
Your Java application now has a drop-down date selection dialog.

Which websocket library to use with Node.js?

Update: This answer is outdated as newer versions of libraries mentioned are released since then.

Socket.IO v0.9 is outdated and a bit buggy, and Engine.IO is the interim successor. Socket.IO v1.0 (which will be released soon) will use Engine.IO and be much better than v0.9. I'd recommend you to use Engine.IO until Socket.IO v1.0 is released.

"ws" does not support fallback, so if the client browser does not support websockets, it won't work, unlike Socket.IO and Engine.IO which uses long-polling etc if websockets are not available. However, "ws" seems like the fastest library at the moment.

See my article comparing Socket.IO, Engine.IO and Primus: https://medium.com/p/b63bfca0539

Property 'catch' does not exist on type 'Observable<any>'

Warning: This solution is deprecated since Angular 5.5, please refer to Trent's answer below

=====================

Yes, you need to import the operator:

import 'rxjs/add/operator/catch';

Or import Observable this way:

import {Observable} from 'rxjs/Rx';

But in this case, you import all operators.

See this question for more details:

Angular HTTP GET with TypeScript error http.get(...).map is not a function in [null]

background-size in shorthand background property (CSS3)

Just a note for reference: I was trying to do shorthand like so:

background: url('../images/sprite.png') -312px -234px / 355px auto no-repeat;

but iPhone Safari browsers weren't showing the image properly with a fixed position element. I didn't check with a non-fixed, because I'm lazy. I had to switch the css to what's below, being careful to put background-size after the background property. If you do them in reverse, the background reverts the background-size to the original size of the image. So generally I would avoid using the shorthand to set background-size.

background: url('../images/sprite.png') -312px -234px no-repeat;
background-size: 355px auto;

Download history stock prices automatically from yahoo finance in python

It's trivial when you know how:

import yfinance as yf
df = yf.download('CVS', '2015-01-01')
df.to_csv('cvs-health-corp.csv')

If you wish to plot it:

import finplot as fplt
fplt.candlestick_ochl(df[['Open','Close','High','Low']])
fplt.show()

How to bind list to dataGridView?

Use a BindingList and set the DataPropertyName-Property of the column.

Try the following:

...
private void BindGrid()
{
    gvFilesOnServer.AutoGenerateColumns = false;

    //create the column programatically
    DataGridViewCell cell = new DataGridViewTextBoxCell();
    DataGridViewTextBoxColumn colFileName = new DataGridViewTextBoxColumn()
    {
        CellTemplate = cell, 
        Name = "Value",
        HeaderText = "File Name",
        DataPropertyName = "Value" // Tell the column which property of FileName it should use
     };

    gvFilesOnServer.Columns.Add(colFileName);

    var filelist = GetFileListOnWebServer().ToList();
    var filenamesList = new BindingList<FileName>(filelist); // <-- BindingList

    //Bind BindingList directly to the DataGrid, no need of BindingSource
    gvFilesOnServer.DataSource = filenamesList 
}

java.lang.UnsupportedClassVersionError: Bad version number in .class file?

Always check for the obvious too. I got this error once when I accidently grabbed the wrong resource for the server's add and remove action. It can be easy to overlook.

Error message "unreported exception java.io.IOException; must be caught or declared to be thrown"

The error message means that any method that calls showfile() must either declare that it, in turn, throws IOException, or the call must be inside a try block that catches IOException. When you call showfile(), you do neither of these; for example, your filecontent constructor neither declares IOException nor contains a try block.

The intent is that some method, somewhere, should contain a try block, and catch and handle this exception. The compiler is trying to force you to handle the exception somewhere.

By the way, this code is (sorry to be so blunt) horrible. You don't close any of the files you open, the BufferedReader always points to the first file, even though you seem to be trying to make it point to another, the loops contain off-by-one errors that will cause various exceptions, etc. When you do get this to compile, it will not work as you expect. I think you need to slow down a little.

How do I deal with special characters like \^$.?*|+()[{ in my regex?

I think the easiest way to match the characters like

\^$.?*|+()[

are using character classes from within R. Consider the following to clean column headers from a data file, which could contain spaces, and punctuation characters:

> library(stringr)
> colnames(order_table) <- str_replace_all(colnames(order_table),"[:punct:]|[:space:]","")

This approach allows us to string character classes to match punctation characters, in addition to whitespace characters, something you would normally have to escape with \\ to detect. You can learn more about the character classes at this cheatsheet below, and you can also type in ?regexp to see more info about this.

https://www.rstudio.com/wp-content/uploads/2016/09/RegExCheatsheet.pdf

How to search and replace text in a file?

You can do the replacement like this

f1 = open('file1.txt', 'r')
f2 = open('file2.txt', 'w')
for line in f1:
    f2.write(line.replace('old_text', 'new_text'))
f1.close()
f2.close()

Copy entire directory contents to another directory?

The following is an example of using JDK7.

public class CopyFileVisitor extends SimpleFileVisitor<Path> {
    private final Path targetPath;
    private Path sourcePath = null;
    public CopyFileVisitor(Path targetPath) {
        this.targetPath = targetPath;
    }

    @Override
    public FileVisitResult preVisitDirectory(final Path dir,
    final BasicFileAttributes attrs) throws IOException {
        if (sourcePath == null) {
            sourcePath = dir;
        } else {
        Files.createDirectories(targetPath.resolve(sourcePath
                    .relativize(dir)));
        }
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFile(final Path file,
    final BasicFileAttributes attrs) throws IOException {
    Files.copy(file,
        targetPath.resolve(sourcePath.relativize(file)));
    return FileVisitResult.CONTINUE;
    }
}

To use the visitor do the following

Files.walkFileTree(sourcePath, new CopyFileVisitor(targetPath));

If you'd rather just inline everything (not too efficient if you use it often, but good for quickies)

    final Path targetPath = // target
    final Path sourcePath = // source
    Files.walkFileTree(sourcePath, new SimpleFileVisitor<Path>() {
        @Override
        public FileVisitResult preVisitDirectory(final Path dir,
                final BasicFileAttributes attrs) throws IOException {
            Files.createDirectories(targetPath.resolve(sourcePath
                    .relativize(dir)));
            return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult visitFile(final Path file,
                final BasicFileAttributes attrs) throws IOException {
            Files.copy(file,
                    targetPath.resolve(sourcePath.relativize(file)));
            return FileVisitResult.CONTINUE;
        }
    });

CORS jQuery AJAX request

It's easy, you should set server http response header first. The problem is not with your front-end javascript code. You need to return this header:

Access-Control-Allow-Origin:*

Access-Control-Allow-Origin:your domain

In Apache config files, the code is like this:

Header set Access-Control-Allow-Origin "*"

In nodejs,the code is like this:

res.setHeader('Access-Control-Allow-Origin','*');

Does C# support multiple inheritance?

Sorry, you cannot inherit from multiple classes. You may use interfaces or a combination of one class and interface(s), where interface(s) should follow the class name in the signature.

interface A { }
interface B { }
class Base { }
class AnotherClass { }

Possible ways to inherit:

class SomeClass : A, B { } // from multiple Interface(s)
class SomeClass : Base, B { } // from one Class and Interface(s)

This is not legal:

class SomeClass : Base, AnotherClass { }

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

The website was running fine then suddenly it started to display this same error 404 message (The origin server did not find a current representation for the target resource or is not willing to disclose that one exists), Perhaps because of switching servers back and forward from Tomcat 9 to 8 and 7

In my case, i only had to update the project which was causing this error then restart the specific tomcat version. You may also need to Maven Clean and Maven Install after the "Maven Update Project"

Deserialize JSON array(or list) in C#

Download Json.NET from here http://james.newtonking.com/projects/json-net.aspx

name deserializedName = JsonConvert.DeserializeObject<name>(jsonData);

WRONGTYPE Operation against a key holding the wrong kind of value php

I faced this issue when trying to set something to redis. The problem was that I previously used "set" method to set data with a certain key, like

$redis->set('persons', $persons)

Later I decided to change to "hSet" method, and I tried it this way

foreach($persons as $person){
    $redis->hSet('persons', $person->id, $person);
}

Then I got the aforementioned error. So, what I had to do is to go to redis-cli and manually delete "persons" entry with

del persons

It simply couldn't write different data structure under existing key, so I had to delete the entry and hSet then.

MySQL INNER JOIN select only one row from second table

SELECT u.*, p.*
FROM users AS u
INNER JOIN payments AS p ON p.id = (
    SELECT id
    FROM payments AS p2
    WHERE p2.user_id = u.id
    ORDER BY date DESC
    LIMIT 1
)

SELECT u.*, p.*
FROM users AS u
INNER JOIN payments AS p ON p.user_id = u.id
WHERE NOT EXISTS (
    SELECT 1
    FROM payments AS p2
    WHERE
        p2.user_id = p.user_id AND
        (p2.date > p.date OR (p2.date = p.date AND p2.id > p.id))
)

This solutions are better than the accepted answer because they work correctly when there are multiple payments with same user and date. You can try on SQL Fiddle.

How many bits or bytes are there in a character?

It depends what is the character and what encoding it is in:

An ASCII character in 8-bit ASCII encoding is 8 bits (1 byte), though it can fit in 7 bits.
An ISO-8895-1 character in ISO-8859-1 encoding is 8 bits (1 byte).
A Unicode character in UTF-8 encoding is between 8 bits (1 byte) and 32 bits (4 bytes).
A Unicode character in UTF-16 encoding is between 16 (2 bytes) and 32 bits (4 bytes), though most of the common characters take 16 bits. This is the encoding used by Windows internally.
A Unicode character in UTF-32 encoding is always 32 bits (4 bytes).
An ASCII character in UTF-8 is 8 bits (1 byte), and in UTF-16 - 16 bits.
The additional (non-ASCII) characters in ISO-8895-1 (0xA0-0xFF) would take 16 bits in UTF-8 and UTF-16.

That would mean that there are between 0.03125 and 0.125 characters in a bit.

Why does overflow:hidden not work in a <td>?

Best solution is to put a div into table cell with zero width. Tbody table cells will inherit their widths from widths defined the thead. Position:relative and negative margin should do the trick!

Here is a screenshot: https://flic.kr/p/nvRs4j

<body>
<!-- SOME CSS -->
<style>
    .cropped-table-cells,
    .cropped-table-cells tr td { 
        margin:0px;
        padding:0px;
        border-collapse:collapse;
    }
    .cropped-table-cells tr td {
        border:1px solid lightgray;
        padding:3px 5px 3px 5px;
    }
    .no-overflow {
        display:inline-block;
        white-space:nowrap;
        position:relative; /* must be relative */
        width:100%; /* fit to table cell width */
        margin-right:-1000px; /* technically this is a less than zero width object */
        overflow:hidden;
    }
</style>

<!-- CROPPED TABLE BODIES -->
<table class="cropped-table-cells">
    <thead>
        <tr>
            <td style="width:100px;" width="100"><span>ORDER<span></td>
            <td style="width:100px;" width="100"><span>NAME<span></td>
            <td style="width:200px;" width="200"><span>EMAIL</span></td>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td><span class="no-overflow">123</span></td>
            <td><span class="no-overflow">Lorem ipsum dolor sit amet, consectetur adipisicing elit</span></td>
            <td><span class="no-overflow">sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</span></td>
    </tbody>
</table>
</body>

Add jars to a Spark Job - spark-submit

ClassPath:

ClassPath is affected depending on what you provide. There are a couple of ways to set something on the classpath:

spark.driver.extraClassPath or it's alias --driver-class-path to set extra classpaths on the node running the driver.
spark.executor.extraClassPath to set extra class path on the Worker nodes.

If you want a certain JAR to be effected on both the Master and the Worker, you have to specify these separately in BOTH flags.

Separation character:

Following the same rules as the JVM:

Linux: A colon :
- e.g: --conf "spark.driver.extraClassPath=/opt/prog/hadoop-aws-2.7.1.jar:/opt/prog/aws-java-sdk-1.10.50.jar"
Windows: A semicolon ;
- e.g: --conf "spark.driver.extraClassPath=/opt/prog/hadoop-aws-2.7.1.jar;/opt/prog/aws-java-sdk-1.10.50.jar"

File distribution:

This depends on the mode which you're running your job under:

Client mode - Spark fires up a Netty HTTP server which distributes the files on start up for each of the worker nodes. You can see that when you start your Spark job:

16/05/08 17:29:12 INFO HttpFileServer: HTTP File server directory is /tmp/spark-48911afa-db63-4ffc-a298-015e8b96bc55/httpd-84ae312b-5863-4f4c-a1ea-537bfca2bc2b
16/05/08 17:29:12 INFO HttpServer: Starting HTTP Server
16/05/08 17:29:12 INFO Utils: Successfully started service 'HTTP file server' on port 58922.
16/05/08 17:29:12 INFO SparkContext: Added JAR /opt/foo.jar at http://***:58922/jars/com.mycode.jar with timestamp 1462728552732
16/05/08 17:29:12 INFO SparkContext: Added JAR /opt/aws-java-sdk-1.10.50.jar at http://***:58922/jars/aws-java-sdk-1.10.50.jar with timestamp 1462728552767

Cluster mode - In cluster mode spark selected a leader Worker node to execute the Driver process on. This means the job isn't running directly from the Master node. Here, Spark will not set an HTTP server. You have to manually make your JARS available to all the worker node via HDFS/S3/Other sources which are available to all nodes.

Accepted URI's for files

In "Submitting Applications", the Spark documentation does a good job of explaining the accepted prefixes for files:

When using spark-submit, the application jar along with any jars included with the --jars option will be automatically transferred to the cluster. Spark uses the following URL scheme to allow different strategies for disseminating jars:

file: - Absolute paths and file:/ URIs are served by the driver’s HTTP file server, and every executor pulls the file from the driver HTTP server.

hdfs:, http:, https:, ftp: - these pull down files and JARs from the URI as expected

local: - a URI starting with local:/ is expected to exist as a local file on each worker node. This means that no network IO will be incurred, and works well for large files/JARs that are pushed to each worker, or shared via NFS, GlusterFS, etc.

Note that JARs and files are copied to the working directory for each SparkContext on the executor nodes.

As noted, JARs are copied to the working directory for each Worker node. Where exactly is that? It is usually under /var/run/spark/work, you'll see them like this:

drwxr-xr-x    3 spark spark   4096 May 15 06:16 app-20160515061614-0027
drwxr-xr-x    3 spark spark   4096 May 15 07:04 app-20160515070442-0028
drwxr-xr-x    3 spark spark   4096 May 15 07:18 app-20160515071819-0029
drwxr-xr-x    3 spark spark   4096 May 15 07:38 app-20160515073852-0030
drwxr-xr-x    3 spark spark   4096 May 15 08:13 app-20160515081350-0031
drwxr-xr-x    3 spark spark   4096 May 18 17:20 app-20160518172020-0032
drwxr-xr-x    3 spark spark   4096 May 18 17:20 app-20160518172045-0033

And when you look inside, you'll see all the JARs you deployed along:

[*@*]$ cd /var/run/spark/work/app-20160508173423-0014/1/
[*@*]$ ll
total 89988
-rwxr-xr-x 1 spark spark   801117 May  8 17:34 awscala_2.10-0.5.5.jar
-rwxr-xr-x 1 spark spark 29558264 May  8 17:34 aws-java-sdk-1.10.50.jar
-rwxr-xr-x 1 spark spark 59466931 May  8 17:34 com.mycode.code.jar
-rwxr-xr-x 1 spark spark  2308517 May  8 17:34 guava-19.0.jar
-rw-r--r-- 1 spark spark      457 May  8 17:34 stderr
-rw-r--r-- 1 spark spark        0 May  8 17:34 stdout

Affected options:

The most important thing to understand is priority. If you pass any property via code, it will take precedence over any option you specify via spark-submit. This is mentioned in the Spark documentation:

Any values specified as flags or in the properties file will be passed on to the application and merged with those specified through SparkConf. Properties set directly on the SparkConf take highest precedence, then flags passed to spark-submit or spark-shell, then options in the spark-defaults.conf file

So make sure you set those values in the proper places, so you won't be surprised when one takes priority over the other.

Lets analyze each option in question:

--jars vs SparkContext.addJar: These are identical, only one is set through spark submit and one via code. Choose the one which suites you better. One important thing to note is that using either of these options does not add the JAR to your driver/executor classpath, you'll need to explicitly add them using the extraClassPath config on both.
SparkContext.addJar vs SparkContext.addFile: Use the former when you have a dependency that needs to be used with your code. Use the latter when you simply want to pass an arbitrary file around to your worker nodes, which isn't a run-time dependency in your code.
--conf spark.driver.extraClassPath=... or --driver-class-path: These are aliases, doesn't matter which one you choose
--conf spark.driver.extraLibraryPath=..., or --driver-library-path ... Same as above, aliases.
--conf spark.executor.extraClassPath=...: Use this when you have a dependency which can't be included in an uber JAR (for example, because there are compile time conflicts between library versions) and which you need to load at runtime.
--conf spark.executor.extraLibraryPath=... This is passed as the java.library.path option for the JVM. Use this when you need a library path visible to the JVM.

Would it be safe to assume that for simplicity, I can add additional application jar files using the 3 main options at the same time:

You can safely assume this only for Client mode, not Cluster mode. As I've previously said. Also, the example you gave has some redundant arguments. For example, passing JARs to --driver-library-path is useless, you need to pass them to extraClassPath if you want them to be on your classpath. Ultimately, what you want to do when you deploy external JARs on both the driver and the worker is:

spark-submit --jars additional1.jar,additional2.jar \
  --driver-class-path additional1.jar:additional2.jar \
  --conf spark.executor.extraClassPath=additional1.jar:additional2.jar \
  --class MyClass main-application.jar

Ansible: create a user with sudo privileges

Sometimes it's knowing what to ask. I didn't know as I am a developer who has taken on some DevOps work.

Apparently 'passwordless' or NOPASSWD login is a thing which you need to put in the /etc/sudoers file.

The answer to my question is at Ansible: best practice for maintaining list of sudoers.

The Ansible playbook code fragment looks like this from my problem:

- name: Make sure we have a 'wheel' group
  group:
    name: wheel
    state: present

- name: Allow 'wheel' group to have passwordless sudo
  lineinfile:
    dest: /etc/sudoers
    state: present
    regexp: '^%wheel'
    line: '%wheel ALL=(ALL) NOPASSWD: ALL'
    validate: 'visudo -cf %s'

- name: Add sudoers users to wheel group
  user:
    name=deployer
    groups=wheel
    append=yes
    state=present
    createhome=yes

- name: Set up authorized keys for the deployer user
  authorized_key: user=deployer key="{{item}}"
  with_file:
    - /home/railsdev/.ssh/id_rsa.pub

And the best part is that the solution is idempotent. It doesn't add the line

%wheel ALL=(ALL) NOPASSWD: ALL

to /etc/sudoers when the playbook is run a subsequent time. And yes...I was able to ssh into the server as "deployer" and run sudo commands without having to give a password.

Conditional Logic on Pandas DataFrame

In this specific example, where the DataFrame is only one column, you can write this elegantly as:

df['desired_output'] = df.le(2.5)

le tests whether elements are less than or equal 2.5, similarly lt for less than, gt and ge.

PLS-00201 - identifier must be declared

When creating the TABLE under B2BOWNER, be sure to prefix the PL/SQL function with the Schema name; i.e. B2BOWNER.F_SSC_Page_Map_Insert.

I did not realize this until the DBAs pointed it out. I could have created the table under my root USER/SCHEMA and the PL/SQL function would have worked fine.

Get GMT Time in Java

I wonder why no one does this:

Calendar time = Calendar.getInstance();
time.add(Calendar.MILLISECOND, -time.getTimeZone().getOffset(time.getTimeInMillis()));
Date date = time.getTime();

Update: Since Java 8,9,10 and more, there should be better alternatives supported by Java. Thanks for your comment @humanity

cannot be cast to java.lang.Comparable

I faced a similar kind of issue while using a custom object as a key in Treemap. Whenever you are using a custom object as a key in hashmap then you override two function equals and hashcode, However if you are using ContainsKey method of Treemap on this object then you need to override CompareTo method as well otherwise you will be getting this error Someone using a custom object as a key in hashmap in kotlin should do like following

 data class CustomObjectKey(var key1:String = "" , var 
 key2:String = ""):Comparable<CustomObjectKey?>
 {
override fun compareTo(other: CustomObjectKey?): Int {
    if(other == null)
        return -1
   // suppose you want to do comparison based on key 1 
    return this.key1.compareTo((other)key1)
}

override fun equals(other: Any?): Boolean {
    if(other == null)
        return false
    return this.key1 == (other as CustomObjectKey).key1
}

override fun hashCode(): Int {
    return this.key1.hashCode()
} 
}

How to float a div over Google Maps?

#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

Just need to move the map below this box. Work to me.

From Google

How can I make Bootstrap 4 columns all the same height?

You can use the new Bootstrap cards:

_x000D_

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">_x000D_
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>_x000D_
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>_x000D_
_x000D_
<div class="card-group">_x000D_
  <div class="card">_x000D_
    <img class="card-img-top" src="..." alt="Card image cap">_x000D_
    <div class="card-block">_x000D_
      <h4 class="card-title">Card title</h4>_x000D_
      <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>_x000D_
    </div>_x000D_
    <div class="card-footer">_x000D_
      <small class="text-muted">Last updated 3 mins ago</small>_x000D_
    </div>_x000D_
  </div>_x000D_
  <div class="card">_x000D_
    <img class="card-img-top" src="..." alt="Card image cap">_x000D_
    <div class="card-block">_x000D_
      <h4 class="card-title">Card title</h4>_x000D_
      <p class="card-text">This card has supporting text below as a natural lead-in to additional content.</p>_x000D_
    </div>_x000D_
    <div class="card-footer">_x000D_
      <small class="text-muted">Last updated 3 mins ago</small>_x000D_
    </div>_x000D_
  </div>_x000D_
  <div class="card">_x000D_
    <img class="card-img-top" src="..." alt="Card image cap">_x000D_
    <div class="card-block">_x000D_
      <h4 class="card-title">Card title</h4>_x000D_
      <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This card has even longer content than the first to show that equal height action.</p>_x000D_
    </div>_x000D_
    <div class="card-footer">_x000D_
      <small class="text-muted">Last updated 3 mins ago</small>_x000D_
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</div>

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Link: Click here

regards,

ES6 Class Multiple inheritance

Justin Fagnani describes a very clean (imho) way to compose multiple classes into one using the fact that in ES2015, classes can be created with class expressions.

Expressions vs declarations

Basically, just like you can create a function with an expression:

function myFunction() {}      // function declaration
var myFunction = function(){} // function expression

you can do the same with classes:

class MyClass {}             // class declaration
var MyClass = class {}       // class expression

The expression is evaluated at runtime, when the code executes, whereas a declaration is executed beforehand.

Using class expressions to create mixins

You can use this to create a function that dynamically creates a class only when the function is called:

function createClassExtending(superclass) {
  return class AwesomeClass extends superclass {
    // you class body here as usual
  }
}

The cool thing about it is that you can define the whole class beforehand and only decide on which class it should extend by the time you call the function:

class A {}
class B {}
var ExtendingA = createClassExtending(A)
var ExtendingB = createClassExtending(B)

If you want to mix multiple classes together, because ES6 classes only support single inheritance, you need to create a chain of classes that contains all the classes you want to mix together. So let's say you want to create a class C that extends both A and B, you could do this:

class A {}
class B extends A {}
class C extends B {}  // C extends both A and B

The problem with this is that it's very static. If you later decide you want to make a class D that extends B but not A, you have a problem.

But with some smart trickery using the fact that classes can be expressions, you can solve this by creating A and B not directly as classes, but as class factories (using arrow functions for brevity):

class Base {} // some base class to keep the arrow functions simple
var A = (superclass) => class A extends superclass
var B = (superclass) => class B extends superclass
var C = B(A(Base))
var D = B(Base)

Notice how we only decide at the last moment which classes to include in the hierarchy.

More elegant "ps aux | grep -v grep"

You could use preg_split instead of explode and split on [ ]+ (one or more spaces). But I think in this case you could go with preg_match_all and capturing:

preg_match_all('/[ ]php[ ]+\S+[ ]+(\S+)/', $input, $matches);
$result = $matches[1];

The pattern matches a space, php, more spaces, a string of non-spaces (the path), more spaces, and then captures the next string of non-spaces. The first space is mostly to ensure that you don't match php as part of a user name but really only as a command.

An alternative to capturing is the "keep" feature of PCRE. If you use \K in the pattern, everything before it is discarded in the match:

preg_match_all('/[ ]php[ ]+\S+[ ]+\K\S+/', $input, $matches);
$result = $matches[0];

I would use preg_match(). I do something similar for many of my system management scripts. Here is an example:

$test = "user     12052  0.2  0.1 137184 13056 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust1 cron
user     12054  0.2  0.1 137184 13064 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust3 cron
user     12055  0.6  0.1 137844 14220 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust4 cron
user     12057  0.2  0.1 137184 13052 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust89 cron
user     12058  0.2  0.1 137184 13052 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust435 cron
user     12059  0.3  0.1 135112 13000 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust16 cron
root     12068  0.0  0.0 106088  1164 pts/1    S+   10:00   0:00 sh -c ps aux | grep utilities > /home/user/public_html/logs/dashboard/currentlyPosting.txt
root     12070  0.0  0.0 103240   828 pts/1    R+   10:00   0:00 grep utilities";

$lines = explode("\n", $test);

foreach($lines as $line){
        if(preg_match("/.php[\s+](cust[\d]+)[\s+]cron/i", $line, $matches)){
                print_r($matches);
        }

}

The above prints:

Array
(
    [0] => .php cust1 cron
    [1] => cust1
)
Array
(
    [0] => .php cust3 cron
    [1] => cust3
)
Array
(
    [0] => .php cust4 cron
    [1] => cust4
)
Array
(
    [0] => .php cust89 cron
    [1] => cust89
)
Array
(
    [0] => .php cust435 cron
    [1] => cust435
)
Array
(
    [0] => .php cust16 cron
    [1] => cust16
)

You can set $test to equal the output from exec. the values you are looking for would be in the if statement under the foreach. $matches[1] will have the custx value.

How to display UTF-8 characters in phpMyAdmin?

I had the same problem,

Set all text/varchar collations in phpMyAdmin to utf-8 and in php files add this:

mysql_set_charset("utf8", $your_connection_name);

This solved it for me.

How do I restart my C# WinForm Application?

You are forgetting the command-line options/parameters that were passed in to your currently running instance. If you don't pass those in, you are not doing a real restart. Set the Process.StartInfo with a clone of your process' parameters, then do a start.

For example, if your process was started as myexe -f -nosplash myfile.txt, your method would only execute myexe without all those flags and parameters.

set gvim font in .vimrc file

Ubuntu 14.04 LTS

:/$ cd etc/vim/
:/etc/vim$ sudo gvim gvimrc

After if - endif block, type

set guifont=Neep\ 10

save the file (:wq!). Here "Neep" (your choice) is the font style and "10" is respect size of the font. Then build the font - cache again.

:/etc/vim$ fc-cache -f -v

Your desired font will set to gvim.

How can I output leading zeros in Ruby?

filenames = '000'.upto('100').map { |index| "file_#{index}" }

Outputs

[file_000, file_001, file_002, file_003, ..., file_098, file_099, file_100]

Download and install an ipa from self hosted url on iOS

Create a Virtual Machine with Windows running on it and download the file to a shared folder. :-D

Repair all tables in one go

You may need user name and password:

mysqlcheck -A --auto-repair -uroot -p

You will be prompted for password.

mysqlcheck -A --auto-repair -uroot -p{{password here}}

If you want to put in cron, BUT your password will be visible in plain text!

Using Chrome, how to find to which events are bound to an element

findEventHandlers is a jquery plugin, the raw code is here: https://raw.githubusercontent.com/ruidfigueiredo/findHandlersJS/master/findEventHandlers.js

Steps

Paste the raw code directely into chrome's console(note:must have jquery loaded already)
Use the following function call: findEventHandlers(eventType, selector);
to find the corresponding's selector specified element's eventType handler.

Example:

findEventHandlers("click", "#clickThis");

Then if any, the available event handler will show bellow, you need to expand to find the handler, right click the function and select show function definition

See: https://blinkingcaret.wordpress.com/2014/01/17/quickly-finding-and-debugging-jquery-event-handlers/

Have Excel formulas that return 0, make the result blank

The normal way would be the IF statement, though simpler than your example:

=IF(INDEX(a,b,c),INDEX(a,b,c),"")

No need to do gyrations with the formula, since zero values trigger the false condition.

How to get certain commit from GitHub project

If you want to go with any certain commit or want to code of any certain commit then you can use below command:

git checkout <BRANCH_NAME>
git reset --hard  <commit ID which code you want>
git push --force

Example:

 git reset --hard fbee9dd 
 git push --force

C# DateTime to UTC Time without changing the time

You can use the overloaded constructor of DateTime:

DateTime utcDateTime = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, dateTime.Minute, dateTime.Second, DateTimeKind.Utc);

Difference between "read commited" and "repeatable read"

Old question which has an accepted answer already, but I like to think of these two isolation levels in terms of how they change the locking behavior in SQL Server. This might be helpful for those who are debugging deadlocks like I was.

READ COMMITTED (default)

Shared locks are taken in the SELECT and then released when the SELECT statement completes. This is how the system can guarantee that there are no dirty reads of uncommitted data. Other transactions can still change the underlying rows after your SELECT completes and before your transaction completes.

REPEATABLE READ

Shared locks are taken in the SELECT and then released only after the transaction completes. This is how the system can guarantee that the values you read will not change during the transaction (because they remain locked until the transaction finishes).

When to use RabbitMQ over Kafka?

The short answer is "message acknowledgements". RabbitMQ can be configured to require message acknowledgements. If a receiver fails the message goes back on the queue and another receiver can try again. While you can accomplish this in Kafka with your own code, it works with RabbitMQ out of the box.

In my experience, if you have an application that has requirements to query a stream of information, Kafka and KSql are your best bet. If you want a queueing system you are better off with RabbitMQ.

What is the difference between SessionState and ViewState?

SessionState

Can be persisted in memory, which makes it a fast solution. Which means state cannot be shared in the Web Farm/Web Garden.
Can be persisted in a Database, useful for Web Farms / Web Gardens.
Is Cleared when the session dies - usually after 20min of inactivity.

ViewState

Is sent back and forth between the server and client, taking up bandwidth.
Has no expiration date.
Is useful in a Web Farm / Web Garden

Select first 4 rows of a data.frame in R

For at DataFrame one can simply type

head(data, num=10L)

to get the first 10 for example.

For a data.frame one can simply type

head(data, 10)

to get the first 10.

SQL: how to use UNION and order by a specific select?

SELECT id FROM a -- returns 1,4,2,3
UNION
SELECT id FROM b -- returns 2,1
order by 2,1

How to remove padding around buttons in Android?

In the button's XML set android:includeFontPadding="false"

Printing integer variable and string on same line in SQL

You can't combine a character string and numeric string. You need to convert the number to a string using either CONVERT or CAST.

For example:

print 'There are ' + cast(@Number as varchar) + ' alias combinations did not match a record'

print 'There are ' + convert(varchar,@Number) + ' alias combinations did not match a record'

Replacing spaces with underscores in JavaScript?

To answer Prasanna's question below:

How do you replace multiple spaces by single space in Javascript ?

You would use the same function replace with a different regular expression. The expression for whitespace is \s and the expression for "1 or more times" is + the plus sign, so you'd just replace Adam's answer with the following:

key=key.replace(/\s+/g,"_");

How to access accelerometer/gyroscope data from Javascript?

Usefull fallback here: https://developer.mozilla.org/en-US/docs/Web/Events/MozOrientation

function orientationhandler(evt){


  // For FF3.6+
  if (!evt.gamma && !evt.beta) {
    evt.gamma = -(evt.x * (180 / Math.PI));
    evt.beta = -(evt.y * (180 / Math.PI));
  }

  // use evt.gamma, evt.beta, and evt.alpha 
  // according to dev.w3.org/geo/api/spec-source-orientation


}

window.addEventListener('deviceorientation',  orientationhandler, false);
window.addEventListener('MozOrientation',     orientationhandler, false);

angular2 manually firing click event on particular element

I also wanted similar functionality where I have a File Input Control with display:none and a Button control where I wanted to trigger click event of File Input Control when I click on the button, below is the code to do so

<input type="button" (click)="fileInput.click()" class="btn btn-primary" value="Add From File">
<input type="file" style="display:none;" #fileInput/>

as simple as that and it's working flawlessly...

Stacked Tabs in Bootstrap 3

Left, Right and Below tabs were removed from Bootstrap 3, but you can add custom CSS to achieve this..

.tabs-below > .nav-tabs,
.tabs-right > .nav-tabs,
.tabs-left > .nav-tabs {
  border-bottom: 0;
}

.tab-content > .tab-pane,
.pill-content > .pill-pane {
  display: none;
}

.tab-content > .active,
.pill-content > .active {
  display: block;
}

.tabs-below > .nav-tabs {
  border-top: 1px solid #ddd;
}

.tabs-below > .nav-tabs > li {
  margin-top: -1px;
  margin-bottom: 0;
}

.tabs-below > .nav-tabs > li > a {
  -webkit-border-radius: 0 0 4px 4px;
     -moz-border-radius: 0 0 4px 4px;
          border-radius: 0 0 4px 4px;
}

.tabs-below > .nav-tabs > li > a:hover,
.tabs-below > .nav-tabs > li > a:focus {
  border-top-color: #ddd;
  border-bottom-color: transparent;
}

.tabs-below > .nav-tabs > .active > a,
.tabs-below > .nav-tabs > .active > a:hover,
.tabs-below > .nav-tabs > .active > a:focus {
  border-color: transparent #ddd #ddd #ddd;
}

.tabs-left > .nav-tabs > li,
.tabs-right > .nav-tabs > li {
  float: none;
}

.tabs-left > .nav-tabs > li > a,
.tabs-right > .nav-tabs > li > a {
  min-width: 74px;
  margin-right: 0;
  margin-bottom: 3px;
}

.tabs-left > .nav-tabs {
  float: left;
  margin-right: 19px;
  border-right: 1px solid #ddd;
}

.tabs-left > .nav-tabs > li > a {
  margin-right: -1px;
  -webkit-border-radius: 4px 0 0 4px;
     -moz-border-radius: 4px 0 0 4px;
          border-radius: 4px 0 0 4px;
}

.tabs-left > .nav-tabs > li > a:hover,
.tabs-left > .nav-tabs > li > a:focus {
  border-color: #eeeeee #dddddd #eeeeee #eeeeee;
}

.tabs-left > .nav-tabs .active > a,
.tabs-left > .nav-tabs .active > a:hover,
.tabs-left > .nav-tabs .active > a:focus {
  border-color: #ddd transparent #ddd #ddd;
  *border-right-color: #ffffff;
}

.tabs-right > .nav-tabs {
  float: right;
  margin-left: 19px;
  border-left: 1px solid #ddd;
}

.tabs-right > .nav-tabs > li > a {
  margin-left: -1px;
  -webkit-border-radius: 0 4px 4px 0;
     -moz-border-radius: 0 4px 4px 0;
          border-radius: 0 4px 4px 0;
}

.tabs-right > .nav-tabs > li > a:hover,
.tabs-right > .nav-tabs > li > a:focus {
  border-color: #eeeeee #eeeeee #eeeeee #dddddd;
}

.tabs-right > .nav-tabs .active > a,
.tabs-right > .nav-tabs .active > a:hover,
.tabs-right > .nav-tabs .active > a:focus {
  border-color: #ddd #ddd #ddd transparent;
  *border-left-color: #ffffff;
}

Working example: http://bootply.com/74926

UPDATE

If you don't need the exact look of a tab (bordered appropriately on the left or right as each tab is activated), you can simple use nav-stacked, along with Bootstrap col-* to float the tabs to the left or right...

nav-stacked demo: http://codeply.com/go/rv3Cvr0lZ4

<ul class="nav nav-pills nav-stacked col-md-3">
    <li><a href="#a" data-toggle="tab">1</a></li>
    <li><a href="#b" data-toggle="tab">2</a></li>
    <li><a href="#c" data-toggle="tab">3</a></li>
</ul>

How to see PL/SQL Stored Function body in Oracle

If is a package then you can get the source for that with:

    select text from all_source where name = 'PADCAMPAIGN' 
    and type = 'PACKAGE BODY'
    order by line;

Oracle doesn't store the source for a sub-program separately, so you need to look through the package source for it.

Note: I've assumed you didn't use double-quotes when creating that package, but if you did , then use

    select text from all_source where name = 'pAdCampaign' 
    and type = 'PACKAGE BODY'
    order by line;

Target elements with multiple classes, within one rule

Just in case someone stumbles upon this like I did and doesn't realise, the two variations above are for different use cases.

The following:

.blue-border, .background {
    border: 1px solid #00f;
    background: #fff;
}

is for when you want to add styles to elements that have either the blue-border or background class, for example:

<div class="blue-border">Hello</div>
<div class="background">World</div>
<div class="blue-border background">!</div>

would all get a blue border and white background applied to them.

However, the accepted answer is different.

.blue-border.background {
    border: 1px solid #00f;
    background: #fff;
}

This applies the styles to elements that have both classes so in this example only the <div> with both classes should get the styles applied (in browsers that interpret the CSS properly):

<div class="blue-border">Hello</div>
<div class="background">World</div>
<div class="blue-border background">!</div>

So basically think of it like this, comma separating applies to elements with one class OR another class and dot separating applies to elements with one class AND another class.

php search array key and get value

<?php

// Checks if key exists (doesn't care about it's value).
// @link http://php.net/manual/en/function.array-key-exists.php
if (array_key_exists(20120504, $search_array)) {
  echo $search_array[20120504];
}

// Checks against NULL
// @link http://php.net/manual/en/function.isset.php
if (isset($search_array[20120504])) {
  echo $search_array[20120504];
}

// No warning or error if key doesn't exist plus checks for emptiness.
// @link http://php.net/manual/en/function.empty.php
if (!empty($search_array[20120504])) {
  echo $search_array[20120504];
}

?>

Connect Android Studio with SVN

Run Android Studio.
From the menu bar, select Android Studio
Under IDE Settings, click Plugins and then select Search Subversion Integration
Check SubVersion.
Restart Android Studio.

Android - default value in editText

You can use text property in your xml file for particular Edittext fields. For example :

<EditText
    android:id="@+id/ET_User"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="yourusername"/>

like this all Edittext fields contains text whatever u want,if user wants to change particular Edittext field he remove older text and enter his new text.

In Another way just you get the particular Edittext field id in activity class and set text to that one.

Another way = programmatically

Example:

EditText username=(EditText)findViewById(R.id.ET_User);

username.setText("jack");

Reload browser window after POST without prompting user to resend POST data

This worked for me.

window.location = window.location.pathname;

Tested on

Chrome 44.0.2403
IE edge
Firefox 39.0

Wait 5 seconds before executing next line

Based on Joseph Silber's answer, I would do it like that, a bit more generic.

You would have your function (let's create one based on the question):

function videoStopped(newState){
   if (newState == -1) {
       alert('VIDEO HAS STOPPED');
   }
}

And you could have a wait function:

function wait(milliseconds, foo, arg){
    setTimeout(function () {
        foo(arg); // will be executed after the specified time
    }, milliseconds);
}

At the end you would have:

wait(5000, videoStopped, newState);

That's a solution, I would rather not use arguments in the wait function (to have only foo(); instead of foo(arg);) but that's for the example.

COALESCE with Hive SQL

As Lamak pointed out in the comment, COALESCE(column, CAST(0 AS BIGINT)) resolves the error.

How to checkout in Git by date?

git rev-list -n 1 --before="2009-07-27 13:37" origin/master

take the printed string (for instance XXXX) and do:

git checkout XXXX

Page vs Window in WPF?

Pages are intended for use in Navigation applications (usually with Back and Forward buttons, e.g. Internet Explorer). Pages must be hosted in a NavigationWindow or a Frame

Windows are just normal WPF application Windows, but can host Pages via a Frame container

Trying to get property of non-object - CodeIgniter

In my case, I was looping through a series of objects from an XML file, but some of the instances apparently were not objects which was causing the error. Checking if the object was empty before processing it fixed the problem.

In other words, without checking if the object was empty, the script would error out on any empty object with the error as given below.

Trying to get property of non-object

For Example:

if (!empty($this->xml_data->thing1->thing2))
{
   foreach ($this->xml_data->thing1->thing2 as $thing)
   {

   }
}

Visual Studio Code PHP Intelephense Keep Showing Not Necessary Error

1.3.3 fixed it. Just update your extension.

Matching exact string with JavaScript

Either modify the pattern beforehand so that it only matches the entire string:

var r = /^a$/

or check afterward whether the pattern matched the whole string:

function matchExact(r, str) {
   var match = str.match(r);
   return match && str === match[0];
}

Shortest way to check for null and assign another value if not

To extend @Dave's answer...if planRec.approved_by is already a string

this.approved_by = planRec.approved_by ?? "";

What exactly does Double mean in java?

In a comment on @paxdiablo's answer, you asked:

"So basically, is it better to use Double than Float?"

That is a complicated question. I will deal with it in two parts

Deciding between `double` versus `float`

On the one hand, a double occupies 8 bytes versus 4 bytes for a float. If you have many of them, this may be significant, though it may also have no impact. (Consider the case where the values are in fields or local variables on a 64bit machine, and the JVM aligns them on 64 bit boundaries.) Additionally, floating point arithmetic with double values is typically slower than with float values ... though once again this is hardware dependent.

On the other hand, a double can represent larger (and smaller) numbers than a float and can represent them with more than twice the precision. For the details, refer to Wikipedia.

The tricky question is knowing whether you actually need the extra range and precision of a double. In some cases it is obvious that you need it. In others it is not so obvious. For instance if you are doing calculations such as inverting a matrix or calculating a standard deviation, the extra precision may be critical. On the other hand, in some cases not even double is going to give you enough precision. (And beware of the trap of expecting float and double to give you an exact representation. They won't and they can't!)

There is a branch of mathematics called Numerical Analysis that deals with the effects of rounding error, etc in practical numerical calculations. It used to be a standard part of computer science courses ... back in the 1970's.

Deciding between `Double` versus `Float`

For the Double versus Float case, the issues of precision and range are the same as for double versus float, but the relative performance measures will be slightly different.

A Double (on a 32 bit machine) typically takes 16 bytes + 4 bytes for the reference, compared with 12 + 4 bytes for a Float. Compare this to 8 bytes versus 4 bytes for the double versus float case. So the ratio is 5 to 4 versus 2 to 1.
Arithmetic involving Double and Float typically involves dereferencing the pointer and creating a new object to hold the result (depending on the circumstances). These extra overheads also affect the ratios in favor of the Double case.

Correctness

Having said all that, the most important thing is correctness, and this typically means getting the most accurate answer. And even if accuracy is not critical, it is usually not wrong to be "too accurate". So, the simple "rule of thumb" is to use double in preference to float, UNLESS there is an overriding performance requirement, AND you have solid evidence that using float will make a difference with respect to that requirement.

how to call service method from ng-change of select in angularjs?

You have at least two issues in your code:

ng-change="getScoreData(Score)

Angular doesn't see getScoreData method that refers to defined service
getScoreData: function (Score, callback)

We don't need to use callback since GET returns promise. Use then instead.

Here is a working example (I used random address only for simulation):

HTML

<select ng-model="score"
        ng-change="getScoreData(score)" 
        ng-options="score as score.name for score in  scores"></select>
    <pre>{{ScoreData|json}}</pre>

var fessmodule = angular.module('myModule', ['ngResource']);

fessmodule.controller('fessCntrl', function($scope, ScoreDataService) {

    $scope.scores = [{
        name: 'Bukit Batok Street 1',
        URL: 'http://maps.googleapis.com/maps/api/geocode/json?address=Singapore, SG, Singapore, 153 Bukit Batok Street 1&sensor=true'
    }, {
        name: 'London 8',
        URL: 'http://maps.googleapis.com/maps/api/geocode/json?address=Singapore, SG, Singapore, London 8&sensor=true'
    }];

    $scope.getScoreData = function(score) {
        ScoreDataService.getScoreData(score).then(function(result) {
            $scope.ScoreData = result;
        }, function(result) {
            alert("Error: No data returned");
        });
    };

});

fessmodule.$inject = ['$scope', 'ScoreDataService'];

fessmodule.factory('ScoreDataService', ['$http', '$q', function($http) {

    var factory = {
        getScoreData: function(score) {
            console.log(score);
            var data = $http({
                method: 'GET',
                url: score.URL
            });


            return data;
        }
    }
    return factory;
}]);

Demo Fiddle

Java get month string from integer

`Month` enum

You could use the Month enum. This enum is defined as part of the new java.time framework built into Java 8 and later.

int monthNumber = 10;
Month.of(monthNumber).name();

The output would be:

OCTOBER

Localize

Localize to a language beyond English by calling getDisplayName on the same Enum.

String output = Month.OCTOBER.getDisplayName ( TextStyle.FULL , Locale.CANADA_FRENCH );

output:

octobre

DataFrame constructor not properly called! error

You are providing a string representation of a dict to the DataFrame constructor, and not a dict itself. So this is the reason you get that error.

So if you want to use your code, you could do:

df = DataFrame(eval(data))

But better would be to not create the string in the first place, but directly putting it in a dict. Something roughly like:

data = []
for row in result_set:
    data.append({'value': row["tag_expression"], 'key': row["tag_name"]})

But probably even this is not needed, as depending on what is exactly in your result_set you could probably:

provide this directly to a DataFrame: DataFrame(result_set)
or use the pandas read_sql_query function to do this for you (see docs on this)

Index of Currently Selected Row in DataGridView

Try DataGridView.CurrentCellAddress.

Returns: A Point that represents the row and column indexes of the currently active cell.

E.G. Select the first column and the fifth row, and you'll get back: Point( X=1, Y=5 )

Convert a Map<String, String> to a POJO

The answers provided so far using Jackson are so good, but still you could have a util function to help you convert different POJOs as follows:

    public static <T> T convert(Map<String, Object> aMap, Class<T> t) {
        try {
            return objectMapper
                    .convertValue(aMap, objectMapper.getTypeFactory().constructType(t));
        } catch (Exception e) {
            log.error("converting failed! aMap: {}, class: {}", getJsonString(aMap), t.getClass().getSimpleName(), e);
        }
        return null;
    }

How do I close a tkinter window?

import Tkinter as tk

def quit(root):
    root.destroy()

root = tk.Tk()
tk.Button(root, text="Quit", command=lambda root=root:quit(root)).pack()
root.mainloop()

How to create an Array, ArrayList, Stack and Queue in Java?

Just a small correction to the first answer in this thread.

Even for Stack, you need to create new object with generics if you are using Stack from java util packages.

Right usage:
    Stack<Integer> s = new Stack<Integer>();
    Stack<String> s1 = new Stack<String>();

    s.push(7);
    s.push(50);

    s1.push("string");
    s1.push("stack");

if used otherwise, as mentioned in above post, which is:

    /*
    Stack myStack = new Stack();
    // add any type of elements (String, int, etc..)
    myStack.push("Hello");
    myStack.push(1);
    */

Although this code works fine, has unsafe or unchecked operations which results in error.

DB2 SQL error sqlcode=-104 sqlstate=42601

You miss the from clause

SELECT *  from TCCAWZTXD.TCC_COIL_DEMODATA WHERE CURRENT_INSERTTIME  BETWEEN(CURRENT_TIMESTAMP)-5 minutes AND CURRENT_TIMESTAMP

Oracle 11g Express Edition for Windows 64bit?

It's not available yet. See this thread on the official forum.

Replace specific characters within strings

      library(stringi)

            group <- c('12357e', '12575e', '12575e', ' 197e18',  'e18947')

            pattern <- "e"  
            replacement <-  ""  
            group <- str_replace(group, pattern, replacement)      
            group    

[1] "12357"  "12575"  "12575"  " 19718" "18947"

Python - Locating the position of a regex match in a string?

re.Match objects have a number of methods to help you with this:

>>> m = re.search("is", String)
>>> m.span()
(2, 4)
>>> m.start()
2
>>> m.end()
4

How to convert file to base64 in JavaScript?

TypeScript version

const file2Base64 = (file:File):Promise<string> => {
    return new Promise<string> ((resolve,reject)=> {
         const reader = new FileReader();
         reader.readAsDataURL(file);
         reader.onload = () => resolve(reader.result.toString());
         reader.onerror = error => reject(error);
     })
    }

Check if a variable is of function type

There are several ways so I will summarize them all

Best way is:
```
function foo(v) {if (v instanceof Function) {/* do something */} };
```
Most performant (no string comparison) and elegant solution - the instanceof operator has been supported in browsers for a very long time, so don't worry - it will work in IE 6.
Next best way is:
```
function foo(v) {if (typeof v === "function") {/* do something */} };
```
disadvantage of typeof is that it is susceptible to silent failure, bad, so if you have a typo (e.g. "finction") - in this case the `if` will just return false and you won't know you have an error until later in your code

The next best way is:


function isFunction(functionToCheck) {
    var getType = {};
    return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
}

This has no advantage over solution #1 or #2 but is a lot less readable. An improved version of this is


function isFunction(x) {
    return Object.prototype.toString.call(x) == '[object Function]';
}

but still lot less semantic than solution #1

How to redirect cin and cout to files?

If your input file is in.txt, you can use freopen to set stdin file as in.txt

freopen("in.txt","r",stdin);

if you want to do the same with your output:

freopen("out.txt","w",stdout);

this will work for std::cin (if using c++), printf, etc...

This will also help you in debugging your code in clion, vscode

How do I remove leading whitespace in Python?

To remove everything before a certain character, use a regular expression:

re.sub(r'^[^a]*', '')

to remove everything up to the first 'a'. [^a] can be replaced with any character class you like, such as word characters.

Sqlite: CURRENT_TIMESTAMP is in GMT, not the timezone of the machine

SELECT datetime(CURRENT_TIMESTAMP, 'localtime')

Find text string using jQuery?

If you just want the node closest to the text you're searching for, you could use this:

$('*:contains("my text"):last');

This will even work if your HTML looks like this:

<p> blah blah <strong>my <em>text</em></strong></p>

Using the above selector will find the <strong> tag, since that's the last tag which contains that entire string.

Unable to launch the IIS Express Web server, Failed to register URL, Access is denied

I solved this issue by killing all instances of iexplorer and iexplorer*32. It looks like Internet Explorer was still in memory holding the port open even though the application window was closed.

Why does z-index not work?

Make sure that this element you would like to control with z-index does not have a parent with z-index property, because element is in a lower stacking context due to its parent’s z-index level.

Here's an example:

<section class="content">            
    <div class="modal"></div>
</section>

<div class="side-tab"></div>

// CSS //
.content {
    position: relative;
    z-index: 1;
}

.modal {
    position: fixed;
    z-index: 100;
}

.side-tab {
    position: fixed;
    z-index: 5;
}

In the example above, the modal has a higher z-index than the content, although the content will appear on top of the modal because "content" is the parent with a z-index property.

Here's an article that explains 4 reasons why z-index might not work: https://coder-coder.com/z-index-isnt-working/

"Press Any Key to Continue" function in C

You can try more system indeppended method: system("pause");

fork and exec in bash

How about:

(sleep 5; echo "Hello World") &

How do you uninstall all dependencies listed in package.json (NPM)?

(Don't replicate these steps till you read everything)

For me all mentioned solutions didn't work. Soo I went to /usr/lib and run there

for package in `ls node_modules`; do sudo npm uninstall $package; done;

But it also removed the npm package and only half of the packages (till it reached letter n).

So I tried to install node again by the node guide.

# Using Ubuntu
curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
sudo apt-get install -y nodejs

But it didn't install npm again.

So I decided to reinstall whole node sudo apt-get remove nodejs And again install by the guide above.

Now is NPM again working but the global modules are still there. So I checked the content of the directory /usr/lib/node_modules and seems the only important here is npm. So I edited the command above to uninstall everything except npm

for package in $(ls node_modules); do if [ "$package" != "npm" ]; then sudo npm uninstall $package; fi; done;

It removed all modules what were not prefixed @. Soo I extended the loop for subdirectories.

for package in $(ls node_modules); do if [  ${package:0:1} = \@ ]; then 
        for innerPackage in $(ls node_modules/${package}); do
                sudo npm uninstall "$package/$innerPackage";
        done;
fi; done;

My /usr/lib/node_modules now contains only npm and linked packages.

Can I pass parameters in computed properties in Vue.Js

You can use methods, but I prefer still to use computed properties instead of methods, if they're not mutating data or do not have external effects.

You can pass arguments to computed properties this way (not documented, but suggested by maintainers, don't remember where):

computed: {
   fullName: function () {
      var vm = this;
      return function (salut) {
          return salut + ' ' + vm.firstName + ' ' + vm.lastName;  
      };
   }
}

EDIT: Please do not use this solution, it only complicates code without any benefits.

Eclipse Generate Javadoc Wizard: what is "Javadoc Command"?

Had this problem and solved typing this : C:\Program Files (x86)\Java\jdk1.7.0_51\bin\javadoc.exe

What arguments are passed into AsyncTask<arg1, arg2, arg3>?

I'm too late to the party but thought this might help someone.

How to check encoding of a CSV file

You can use Notepad++ to evaluate a file's encoding without needing to write code. The evaluated encoding of the open file will display on the bottom bar, far right side. The encodings supported can be seen by going to Settings -> Preferences -> New Document/Default Directory and looking in the drop down.

How to JSON serialize sets?

You can create a custom encoder that returns a list when it encounters a set. Here's an example:

>>> import json
>>> class SetEncoder(json.JSONEncoder):
...    def default(self, obj):
...       if isinstance(obj, set):
...          return list(obj)
...       return json.JSONEncoder.default(self, obj)
... 
>>> json.dumps(set([1,2,3,4,5]), cls=SetEncoder)
'[1, 2, 3, 4, 5]'

You can detect other types this way too. If you need to retain that the list was actually a set, you could use a custom encoding. Something like return {'type':'set', 'list':list(obj)} might work.

To illustrated nested types, consider serializing this:

>>> class Something(object):
...    pass
>>> json.dumps(set([1,2,3,4,5,Something()]), cls=SetEncoder)

This raises the following error:

TypeError: <__main__.Something object at 0x1691c50> is not JSON serializable

This indicates that the encoder will take the list result returned and recursively call the serializer on its children. To add a custom serializer for multiple types, you can do this:

>>> class SetEncoder(json.JSONEncoder):
...    def default(self, obj):
...       if isinstance(obj, set):
...          return list(obj)
...       if isinstance(obj, Something):
...          return 'CustomSomethingRepresentation'
...       return json.JSONEncoder.default(self, obj)
... 
>>> json.dumps(set([1,2,3,4,5,Something()]), cls=SetEncoder)
'[1, 2, 3, 4, 5, "CustomSomethingRepresentation"]'

How to clear all <div>s’ contents inside a parent <div>?

jQuery recommend you use ".empty()",".remove()",".detach()"

if you needed delete all element in element, use this code :

$('#target_id').empty();

if you needed delete all element, Use this code:

$('#target_id').remove();

i and jQuery group not recommend for use SET FUNCTION like .html() .attr() .text() , what is that? it's IF YOU WANT TO SET ANYTHING YOU NEED

ref :https://learn.jquery.com/using-jquery-core/manipulating-elements/

How to prevent a browser from storing passwords

I tested the many solutions and finally I came with this solution.

HTML Code

<input type="text" name="UserName" id="UserName" placeholder="UserName" autocomplete="off" />
<input type="text" name="Password" id="Password" placeholder="Password" autocomplete="off"/>

CSS Code

#Password {
    text-security: disc;
    -webkit-text-security: disc;
    -moz-text-security: disc;
}

JavaScript Code

window.onload = function () {
    init();
}

function init() {
    var x = document.getElementsByTagName("input")["Password"];
    var style = window.getComputedStyle(x);
    console.log(style);

    if (style.webkitTextSecurity) {
        // Do nothing
    } else {
        x.setAttribute("type", "password");
    }
}

How to build x86 and/or x64 on Windows from command line with CMAKE?

try use CMAKE_GENERATOR_PLATFORM

e.g.

// x86
cmake -DCMAKE_GENERATOR_PLATFORM=x86 . 

// x64
cmake -DCMAKE_GENERATOR_PLATFORM=x64 .

Find duplicate entries in a column

Try this query.. It uses the Analytic function SUM:

SELECT * FROM
(  
 SELECT SUM(1) OVER(PARTITION BY ctn_no) cnt, A.*
 FROM table1 a 
 WHERE s_ind ='Y'   
)
WHERE cnt > 2

Am not sure why you are identifying a record as a duplicate if the ctn_no repeats more than 2 times. FOr me it repeats more than once it is a duplicate. In this case change the las part of the query to WHERE cnt > 1

IntelliJ: Error:java: error: release version 5 not supported

In IntelliJ, the default maven compiler version is less than version 5, which is not supported, so we have to manually change the version of the maven compiler.

We have two ways to define version.

First way:

<properties>
  <maven.compiler.target>1.8</maven.compiler.target>
  <maven.compiler.source>1.8</maven.compiler.source>
</properties>

Second way:

<build>
  <plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
            <source>8</source>
            <target>8</target>
        </configuration>
    </plugin>
  </plugins>
</build>

Input group - two inputs close to each other

Create a input-group-glue class with this:

_x000D_

.input-group-glue {_x000D_
  width: 0;_x000D_
  display: table-cell;_x000D_
}_x000D_
_x000D_
.input-group-glue + .form-control {_x000D_
  border-left: none;_x000D_
}

_x000D_

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<div class="input-group">_x000D_
  <input type="text" class="form-control" value="test1" />_x000D_
  <span class="input-group-glue"></span>_x000D_
  <input type="text" class="form-control" value="test2" />_x000D_
  <span class="input-group-glue"></span>_x000D_
  <input type="text" class="form-control" value="test2" />_x000D_
</div>

_x000D_

How to use componentWillMount() in React Hooks?

React Lifecycle methods in hooks

for simple visual reference follow this image

As you can simply see in the above picture that for ComponentWillUnmount, you have to do like this

 useEffect(() => {
    return () => {
        console.log('componentWillUnmount');
    };
   }, []);

How to save password when using Subversion from the console

I had to edit ~/.subversion/servers. I set store-plaintext-passwords = yes (was no previously). That did the trick. It might be considered insecure though.

Replace part of a string in Python?

Use the replace() method on string:

>>> stuff = "Big and small"
>>> stuff.replace( " and ", "/" )
'Big/small'

About .bash_profile, .bashrc, and where should alias be written in?

The reason you separate the login and non-login shell is because the .bashrc file is reloaded every time you start a new copy of Bash. The .profile file is loaded only when you either log in or use the appropriate flag to tell Bash to act as a login shell.

Personally,

I put my PATH setup into a .profile file (because I sometimes use other shells);
I put my Bash aliases and functions into my .bashrc file;

I put this

#!/bin/bash
#
# CRM .bash_profile Time-stamp: "2008-12-07 19:42"
#
# echo "Loading ${HOME}/.bash_profile"
source ~/.profile # get my PATH setup
source ~/.bashrc  # get my Bash aliases

in my .bash_profile file.

Oh, and the reason you need to type bash again to get the new alias is that Bash loads your .bashrc file when it starts but it doesn't reload it unless you tell it to. You can reload the .bashrc file (and not need a second shell) by typing

source ~/.bashrc

which loads the .bashrc file as if you had typed the commands directly to Bash.

How to receive POST data in django

res = request.GET['paymentid'] will raise a KeyError if paymentid is not in the GET data.

Your sample php code checks to see if paymentid is in the POST data, and sets $payID to '' otherwise:

$payID = isset($_POST['paymentid']) ? $_POST['paymentid'] : ''

The equivalent in python is to use the get() method with a default argument:

payment_id = request.POST.get('payment_id', '')

while debugging, this is what I see in the response.GET: <QueryDict: {}>, request.POST: <QueryDict: {}>

It looks as if the problem is not accessing the POST data, but that there is no POST data. How are you are debugging? Are you using your browser, or is it the payment gateway accessing your page? It would be helpful if you shared your view.

Once you are managing to submit some post data to your page, it shouldn't be too tricky to convert the sample php to python.

How to obtain Certificate Signing Request

To manually generate a Certificate, you need a Certificate Signing Request (CSR) file from your Mac. To create a CSR file, follow the instructions below to create one using Keychain Access.

Create a CSR file. In the Applications folder on your Mac, open the Utilities folder and launch Keychain Access.

Within the Keychain Access drop down menu, select Keychain Access > Certificate Assistant > Request a Certificate from a Certificate Authority.

In the Certificate Information window, enter the following information: In the User Email Address field, enter your email address. In the Common Name field, create a name for your private key (e.g., John Doe Dev Key). The CA Email Address field should be left empty. In the "Request is" group, select the "Saved to disk" option. Click Continue within Keychain Access to complete the CSR generating process.

What is the C++ function to raise a number to a power?

Many answers have suggested pow() or similar alternatives or their own implementations. However, given the examples (2^1, 2^2 and 2^3) in your question, I would guess whether you only need to raise 2 to an integer power. If this is the case, I would suggest you to use 1 << n for 2^n.

Easiest way to parse a comma delimited string to some kind of object I can loop through to access the individual values?

Sometimes the columns will have commas within themselves, such as:

"Some item", "Another Item", "Also, One more item"

In these cases, splitting on "," will break some columns. Maybe an easier way, but I just made my own method (as a bonus, handles spaces after commas and returns an IList):

private IList<string> GetColumns(string columns)
{
    IList<string> list = new List<string>();

    if (!string.IsNullOrWhiteSpace(columns))
    {
        if (columns[0] != '\"')
        {
            // treat as just one item
            list.Add(columns);
        }
        else
        {
            bool gettingItemName = true;
            bool justChanged = false;
            string itemName = string.Empty;

            for (int index = 1; index < columns.Length; index++)
            {
                justChanged = false;
                if (subIndustries[index] == '\"')
                {
                    gettingItemName = !gettingItemName;
                    justChanged = true;
                }

                if ((gettingItemName == false) &&
                (justChanged == true))
                {
                    list.Add(itemName);
                    itemName = string.Empty;
                    justChanged = false;
                }

                if ((gettingItemName == true) && (justChanged == false))
                {
                    itemName += columns[index];
                }
            }
        }
    }

    return list;
}

How to Calculate Execution Time of a Code Snippet in C++

Windows provides QueryPerformanceCounter() function, and Unix has gettimeofday() Both functions can measure at least 1 micro-second difference.

How do I compute derivative using Numpy?

You have four options

Finite differences require no external tools but are prone to numerical error and, if you're in a multivariate situation, can take a while.

Symbolic differentiation is ideal if your problem is simple enough. Symbolic methods are getting quite robust these days. SymPy is an excellent project for this that integrates well with NumPy. Look at the autowrap or lambdify functions or check out Jensen's blogpost about a similar question.

Automatic derivatives are very cool, aren't prone to numeric errors, but do require some additional libraries (google for this, there are a few good options). This is the most robust but also the most sophisticated/difficult to set up choice. If you're fine restricting yourself to numpy syntax then Theano might be a good choice.

Here is an example using SymPy

In [1]: from sympy import *
In [2]: import numpy as np
In [3]: x = Symbol('x')
In [4]: y = x**2 + 1
In [5]: yprime = y.diff(x)
In [6]: yprime
Out[6]: 2·x

In [7]: f = lambdify(x, yprime, 'numpy')
In [8]: f(np.ones(5))
Out[8]: [ 2.  2.  2.  2.  2.]

How to check if $_GET is empty?

I would use the following if statement because it is easier to read (and modify in the future)


if(!isset($_GET) || !is_array($_GET) || count($_GET)==0) {
   // empty, let's make sure it's an empty array for further reference
   $_GET=array();
   // or unset it 
   // or set it to null
   // etc...
}

Add Favicon to Website

Simply put a file named favicon.ico in the webroot.

If you want to know more, please start reading:

Favicon on Wikipedia
Favicon Generator
How to add a Favicon by W3C (from 2005 though)

How to write a basic swap function in Java

  class Swap2Values{
    public static void main(String[] args){
       int a = 20, b = 10;

       //before swaping
       System.out.print("Before Swapping the values of a and b are: a = "+a+", b = "+b);

       //swapping
       a = a + b;
       b = a - b;
       a = a - b;

       //after swapping
      System.out.print("After Swapping the values of a and b are: a = "+a+", b = "+b);
    }
  }

Get item in the list in Scala?

Use parentheses:

data(2)

But you don't really want to do that with lists very often, since linked lists take time to traverse. If you want to index into a collection, use Vector (immutable) or ArrayBuffer (mutable) or possibly Array (which is just a Java array, except again you index into it with (i) instead of [i]).

VBA Convert String to Date

Try using Replace to see if it will work for you. The problem as I see it which has been mentioned a few times above is the CDate function is choking on the periods. You can use replace to change them to slashes. To answer your question about a Function in vba that can parse any date format, there is not any you have very limited options.

Dim current as Date, highest as Date, result() as Date 
For Each itemDate in DeliveryDateArray
    Dim tempDate As String
    itemDate = IIf(Trim(itemDate) = "", "0", itemDate) 'Added per OP's request.
    tempDate = Replace(itemDate, ".", "/")
    current = Format(CDate(tempDate),"dd/mm/yyyy")
    if current > highest then 
        highest = current 
    end if 
    ' some more operations an put dates into result array 
Next itemDate 
'After activating final sheet... 
Range("A1").Resize(UBound(result), 1).Value = Application.Transpose(result)

How can I add private key to the distribution certificate?

This site explain step by step that what you need to do Certificates, Identifiers & Profiles and as your question

"Valid Signing identity not found"?

You need the private key that were used to sign the code base with provisioning profile. . If you don't have then you can generate a new signing request on the iOS developer portal.

For Export:

Xcode -> Organizer, select your team. Click Export. Specify a filename and a password, and click Save.`

For Import:

Xcode -> Organizer, select your team. Click Import. Select the file containing your code signing assets. Enter the password for the file, and click Open.

What is a vertical tab?

In the medical industry, VT is used as the start of frame character in the MLLP/LLP/HLLP protocols that are used to frame HL-7 data, which has been a standard for medical exchange since the late 80s and is still in wide use.

Conditionally Remove Dataframe Rows with R

Logic index:

d<-d[!(d$A=="B" & d$E==0),]

pip cannot install anything

This is the full text of the blog post linked below:

If you've tried installing a package with pip recently, you may have encountered this error:

Could not fetch URL https://pypi.python.org/simple/Django/: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/Django/ when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Could not fetch URL https://pypi.python.org/simple/: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/ when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Cannot fetch index base URL https://pypi.python.org/simple/
  Could not fetch URL https://pypi.python.org/simple/Django/1.5.1: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/Django/1.5.1 when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Could not fetch URL https://pypi.python.org/simple/Django/: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/Django/ when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Could not find any downloads that satisfy the requirement Django==1.5.1 (from -r requirements.txt (line 1))
No distributions at all found for Django==1.5.1 (from -r requirements.txt (line 1))
Storing complete log in /Users/paul/.pip/pip.log

This seems to be an issue with an old version of OpenSSL being incompatible with pip 1.3.1. If you're using a non-stock Python distribution (notably EPD 7.3), you're very likely to have a setup that isn't going to work with pip 1.3.1 without a shitload of work.

The easy workaround for now, is to install pip 1.2.1, which does not require SSL:

curl -O https://pypi.python.org/packages/source/p/pip/pip-1.2.1.tar.gz
tar xvfz pip-1.2.1.tar.gz
cd pip-1.2.1
python setup.py install

If you are using EPD, and you're not using it for a class where things might break, you may want to consider installing the new incarnation: Enthought Canopy. I know they were aware of the issues caused by the previous version of OpenSSL, and would imagine they are using a new version now that should play nicely with pip 1.3.1.

SQL Server - In clause with a declared variable

DECLARE @IDQuery VARCHAR(MAX)
SET @IDQuery = 'SELECT ID FROM SomeTable WHERE Condition=Something'
DECLARE @ExcludedList TABLE(ID VARCHAR(MAX))
INSERT INTO @ExcludedList EXEC(@IDQuery)    
SELECT * FROM A WHERE Id NOT IN (@ExcludedList)

I know I'm responding to an old post but I wanted to share an example of how to use Variable Tables when one wants to avoid using dynamic SQL. I'm not sure if its the most efficient way, however this has worked in the past for me when dynamic SQL was not an option.

Can VS Code run on Android?

To date, there isn't a native VS Code editor for android, but projects do exist like Microsoft/monaco-editor which aim to provide a native experience in the browser.

CodeSandbox is a sophisticated online editor built around Monaco

Finding the max value of an attribute in an array of objects

var max = 0;                
jQuery.map(arr, function (obj) {
  if (obj.attr > max)
    max = obj.attr;
});

What bitrate is used for each of the youtube video qualities (360p - 1080p), in regards to flowplayer?

Looking at this official google link: Youtube Live encoder settings, bitrates and resolutions they have this table:

                   240p       360p        480p        720p        1080p
Resolution      426 x 240   640 x 360   854x480     1280x720    1920x1080
Video Bitrates                   
Maximum         700 Kbps    1000 Kbps   2000 Kbps   4000 Kbps   6000 Kbps
Recommended     400 Kbps    750 Kbps    1000 Kbps   2500 Kbps   4500 Kbps
Minimum         300 Kbps    400 Kbps    500 Kbps    1500 Kbps   3000 Kbps

It would appear as though this is the case, although the numbers dont sync up to the google table above:

// the bitrates, video width and file names for this clip
      bitrates: [
        { url: "bbb-800.mp4", width: 480, bitrate: 800 }, //360p video
        { url: "bbb-1200.mp4", width: 720, bitrate: 1200 }, //480p video
        { url: "bbb-1600.mp4", width: 1080, bitrate: 1600 } //720p video
      ],

wait until all threads finish their work in java

Use this in your main thread: while(!executor.isTerminated()); Put this line of code after starting all the threads from executor service. This will only start the main thread after all the threads started by executors are finished. Make sure to call executor.shutdown(); before the above loop.

append multiple values for one key in a dictionary

You would be best off using collections.defaultdict (added in Python 2.5). This allows you to specify the default object type of a missing key (such as a list).

So instead of creating a key if it doesn't exist first and then appending to the value of the key, you cut out the middle-man and just directly append to non-existing keys to get the desired result.

A quick example using your data:

>>> from collections import defaultdict
>>> data = [(2010, 2), (2009, 4), (1989, 8), (2009, 7)]
>>> d = defaultdict(list)
>>> d
defaultdict(<type 'list'>, {})
>>> for year, month in data:
...     d[year].append(month)
... 
>>> d
defaultdict(<type 'list'>, {2009: [4, 7], 2010: [2], 1989: [8]})

This way you don't have to worry about whether you've seen a digit associated with a year or not. You just append and forget, knowing that a missing key will always be a list. If a key already exists, then it will just be appended to.

Finding all possible permutations of a given string in python

This program does not eliminate the duplicates, but I think it is one of the most efficient approaches:

s=raw_input("Enter a string: ")
print "Permutations :\n",s
size=len(s)
lis=list(range(0,size))
while(True):
    k=-1
    while(k>-size and lis[k-1]>lis[k]):
        k-=1
    if k>-size:
        p=sorted(lis[k-1:])
        e=p[p.index(lis[k-1])+1]
        lis.insert(k-1,'A')
        lis.remove(e)
        lis[lis.index('A')]=e
        lis[k:]=sorted(lis[k:])
        list2=[]
        for k in lis:
                list2.append(s[k])
        print "".join(list2)
    else:
                break

UTL_FILE.FOPEN() procedure not accepting path for directory?

For utl_file.open(location,filename,mode) , we need to give directory name for location but not path. For Example:DATA_FILE_DIR , this is the directory name and check out the directory path for that particular directory name.

What is the difference between screenX/Y, clientX/Y and pageX/Y?

pageX/Y gives the coordinates relative to the <html> element in CSS pixels.
clientX/Y gives the coordinates relative to the viewport in CSS pixels.
screenX/Y gives the coordinates relative to the screen in device pixels.

Regarding your last question if calculations are similar on desktop and mobile browsers... For a better understanding - on mobile browsers - we need to differentiate two new concept: the layout viewport and visual viewport. The visual viewport is the part of the page that's currently shown onscreen. The layout viewport is synonym for a full page rendered on a desktop browser (with all the elements that are not visible on the current viewport).

On mobile browsers the pageX and pageY are still relative to the page in CSS pixels so you can obtain the mouse coordinates relative to the document page. On the other hand clientX and clientY define the mouse coordinates in relation to the visual viewport.

There is another stackoverflow thread here regarding the differences between the visual viewport and layout viewport : Difference between visual viewport and layout viewport?

Another good resource: http://www.quirksmode.org/mobile/viewports2.html

mysql delete under safe mode

Googling around, the popular answer seems to be "just turn off safe mode":

SET SQL_SAFE_UPDATES = 0;
DELETE FROM instructor WHERE salary BETWEEN 13000 AND 15000;
SET SQL_SAFE_UPDATES = 1;

If I'm honest, I can't say I've ever made a habit of running in safe mode. Still, I'm not entirely comfortable with this answer since it just assumes you should go change your database config every time you run into a problem.

So, your second query is closer to the mark, but hits another problem: MySQL applies a few restrictions to subqueries, and one of them is that you can't modify a table while selecting from it in a subquery.

Quoting from the MySQL manual, Restrictions on Subqueries:

In general, you cannot modify a table and select from the same table in a subquery. For example, this limitation applies to statements of the following forms:
DELETE FROM t WHERE ... (SELECT ... FROM t ...);
UPDATE t ... WHERE col = (SELECT ... FROM t ...);
{INSERT|REPLACE} INTO t (SELECT ... FROM t ...);
Exception: The preceding prohibition does not apply if you are using a subquery for the modified table in the FROM clause. Example:
UPDATE t ... WHERE col = (SELECT * FROM (SELECT ... FROM t...) AS _t ...);
Here the result from the subquery in the FROM clause is stored as a temporary table, so the relevant rows in t have already been selected by the time the update to t takes place.

That last bit is your answer. Select target IDs in a temporary table, then delete by referencing the IDs in that table:

DELETE FROM instructor WHERE id IN (
  SELECT temp.id FROM (
    SELECT id FROM instructor WHERE salary BETWEEN 13000 AND 15000
  ) AS temp
);

SQLFiddle demo.

Is there a job scheduler library for node.js?

I am the auhor of node-runnr . It have a very simple approach to create job. Also its very easy and clear to declare time and interval. For example, to execute a job at every 10min 20sec,

Runnr.addIntervalJob('10:20', function(){...}, 'myjob')

To do a job at 10am and 3pm daily,

Runnr.addDailyJob(['10:0:0', '15:0:0'], function(){...}, 'myjob')

Its that simple. For further detail: https://github.com/Saquib764/node-runnr

How to iterate over a column vector in Matlab?

for i=1:length(list)
  elm = list(i);
  //do something with elm.

How do I remove a single breakpoint with GDB?

Try these (reference):

clear linenum
clear filename:linenum

Determining image file size + dimensions via Javascript?

Check the uploaded image size using Javascript

<script type="text/javascript">
    function check(){
      var imgpath=document.getElementById('imgfile');
      if (!imgpath.value==""){
        var img=imgpath.files[0].size;
        var imgsize=img/1024; 
        alert(imgsize);
      }
    }
</script>

Html code

<form method="post" enctype="multipart/form-data" onsubmit="return check();">
<input type="file" name="imgfile" id="imgfile"><br><input type="submit">
</form>

How to make tesseract to recognize only numbers, when they are mixed with letters?

I made it a bit different (with tess-two). Maybe it will be useful for somebody.

So you need to initialize first the API.

TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(datapath, language, ocrEngineMode);

Then set the following variables

baseApi.setPageSegMode(TessBaseAPI.PageSegMode.PSM_SINGLE_LINE);
baseApi.setVariable(TessBaseAPI.VAR_CHAR_BLACKLIST, "!?@#$%&*()<>_-+=/:;'\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
baseApi.setVariable(TessBaseAPI.VAR_CHAR_WHITELIST, ".,0123456789");
baseApi.setVariable("classify_bln_numeric_mode", "1");

In this way the engine will check only the numbers.

How to check visibility of software keyboard in Android?

It has been forever in terms of the computer but this question is still unbelievably relevant! So I've taken the above answers and have combined and refined them a bit...

public interface OnKeyboardVisibilityListener {
    void onVisibilityChanged(boolean visible);
}

public final void setKeyboardListener(final OnKeyboardVisibilityListener listener) {
    final View activityRootView = ((ViewGroup) getActivity().findViewById(android.R.id.content)).getChildAt(0);
    activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

        private boolean wasOpened;

    private final Rect r = new Rect();

        @Override
        public void onGlobalLayout() {
            activityRootView.getWindowVisibleDisplayFrame(r);

            int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
            boolean isOpen = heightDiff > 100;
            if (isOpen == wasOpened) {
                logDebug("Ignoring global layout change...");
                return;
            }

            wasOpened = isOpen;
            listener.onVisibilityChanged(isOpen);
        }
    });
}

It works for me.

MySQL order by before group by

Just to recap, the standard solution uses an uncorrelated subquery and looks like this:

SELECT x.*
  FROM my_table x
  JOIN (SELECT grouping_criteria,MAX(ranking_criterion) max_n FROM my_table GROUP BY grouping_criteria) y
    ON y.grouping_criteria = x.grouping_criteria
   AND y.max_n = x.ranking_criterion;

If you're using an ancient version of MySQL, or a fairly small data set, then you can use the following method:

SELECT x.*
  FROM my_table x
  LEFT
  JOIN my_table y
    ON y.joining_criteria = x.joining_criteria
   AND y.ranking_criteria < x.ranking_criteria
 WHERE y.some_non_null_column IS NULL;

ng: command not found while creating new project using angular-cli

If you have a MacOS computer (mine is MOJAVE 10.14.2), just add these lines to the end of your ~/.bash_profile file:

export ANGULAR=~/.nvm/versions/node/v10.8.0/bin/ng
export PATH=$ANGULAR:$PATH

Notice that v10.8.0 is the version of my installed Node.js. To get which version is yours, run this:

node --version

When done, reload it via your terminal/bash:

cd ~
source .bash_profile

After doing these steps you should be able to run your ng binary file.

sql delete statement where date is greater than 30 days

Use DATEADD in your WHERE clause:

...
WHERE date < DATEADD(day, -30, GETDATE())

You can also use abbreviation d or dd instead of day.

Update Query with INNER JOIN between tables in 2 different databases on 1 server

which may be useful

Update
    A INNER JOIN B ON A.COL1=B.COL3
SET
    A.COL2='CHANGED', A.COL4=B.COL4,......
WHERE ....;

How to un-commit last un-pushed git commit without losing the changes

For the case: "This has not been pushed, only committed." - if you use IntelliJ (or another JetBrains IDE) and you haven't pushed changes yet you can do next.

Go to Version control window (Alt + 9/Command + 9) - "Log" tab.
Right-click on a commit before your last one.
Reset current branch to here
pick Soft (!!!)
push the Reset button in the bottom of the dialog window.

Done.

This will "uncommit" your changes and return your git status to the point before your last local commit. You will not lose any changes you made.

Check if input is number or letter javascript

Try this:

if(parseInt("0"+x, 10) > 0){/* x is integer */}

How to detect a textbox's content has changed

I'd like to ask why you are trying to detect when the content of the textbox changed in real time?

An alternative would be to set a timer (via setIntval?) and compare last saved value to the current one and then reset a timer. This would guarantee catching ANY change, whether caused by keys, mouse, some other input device you didn't consider, or even JavaScript changing the value (another possiblity nobody mentioned) from a different part of the app.

Convert comma separated string of ints to int array

I don't see why taking out the enumerator explicitly offers you any advantage over using a foreach. There's also no need to call AsEnumerable on chunks.

Python list / sublist selection -1 weirdness

If you want to get a sub list including the last element, you leave blank after colon:

>>> ll=range(10)
>>> ll
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> ll[5:]
[5, 6, 7, 8, 9]
>>> ll[:]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Adding one day to a date

The following code get the first day of January of current year (but it can be a another date) and add 365 days to that day (but it can be N number of days) using DateTime class and its method modify() and format():

echo (new DateTime((new DateTime())->modify('first day of January this year')->format('Y-m-d')))->modify('+365 days')->format('Y-m-d');

CURL ERROR: Recv failure: Connection reset by peer - PHP Curl

This is a firewall issue, if you are using a VMware application, make sure the firewall on the antivirus is turned off or allowing connections.

If this server is on a secure network, please have a look at firewall rules of the server.

Thanks Ganesh PNS

Raise an error manually in T-SQL to jump to BEGIN CATCH block

you can use raiserror. Read more details here

--from MSDN

BEGIN TRY
    -- RAISERROR with severity 11-19 will cause execution to 
    -- jump to the CATCH block.
    RAISERROR ('Error raised in TRY block.', -- Message text.
               16, -- Severity.
               1 -- State.
               );
END TRY
BEGIN CATCH
    DECLARE @ErrorMessage NVARCHAR(4000);
    DECLARE @ErrorSeverity INT;
    DECLARE @ErrorState INT;

    SELECT 
        @ErrorMessage = ERROR_MESSAGE(),
        @ErrorSeverity = ERROR_SEVERITY(),
        @ErrorState = ERROR_STATE();

    -- Use RAISERROR inside the CATCH block to return error
    -- information about the original error that caused
    -- execution to jump to the CATCH block.
    RAISERROR (@ErrorMessage, -- Message text.
               @ErrorSeverity, -- Severity.
               @ErrorState -- State.
               );
END CATCH;

EDIT If you are using SQL Server 2012+ you can use throw clause. Here are the details.

Get value of multiselect box using jQuery or pure JS

var data=[];
var $el=$("#my-select");
$el.find('option:selected').each(function(){
    data.push({value:$(this).val(),text:$(this).text()});
});
console.log(data)

Please initialize the log4j system properly warning

None of answered method solve the problem which log4j.properties file is not found for non-maven jsf web project in NetBeans. So the answer is:

Create a folder named resources in project root folder (outermost folder).
Right click project in projects explorer in left menu, select properties.
Open Sources in Categories, add that folder in Source Package Folders.
Open Run in Categories and add this to VM options: Dlog4j.configuration=resources/log4j.properties
Click Ok, build and deploy project as you like, that's it.

I wrote special pattern in log4j file to check whether log4j is used my file:

# Root Logger Option
log4j.rootLogger=INFO, console

# Redirect Log Messages To Console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Target=System.out
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%-5p | %d{yyyy-MM-dd HH:mm:ss} | [%t] %C{2} xxxx (%F:%L) - %m%n

I checked it because if you use BasicConfigurator.configure(); in your code in log4j use predefined pattern.

How do you do relative time in Rails?

Something like this would work.

def relative_time(start_time)
  diff_seconds = Time.now - start_time
  case diff_seconds
    when 0 .. 59
      puts "#{diff_seconds} seconds ago"
    when 60 .. (3600-1)
      puts "#{diff_seconds/60} minutes ago"
    when 3600 .. (3600*24-1)
      puts "#{diff_seconds/3600} hours ago"
    when (3600*24) .. (3600*24*30) 
      puts "#{diff_seconds/(3600*24)} days ago"
    else
      puts start_time.strftime("%m/%d/%Y")
  end
end

WPF: ItemsControl with scrollbar (ScrollViewer)

Put your ScrollViewer in a DockPanel and set the DockPanel MaxHeight property

[...]
<DockPanel MaxHeight="700">
  <ScrollViewer VerticalScrollBarVisibility="Auto">
   <ItemsControl ItemSource ="{Binding ...}">
     [...]
   </ItemsControl>
  </ScrollViewer>
</DockPanel>
[...]

PHP mysql insert date format

You must make sure that the date format is YYYY-MM-DD on your jQuery output. I can see jQuery returns MM-DD-YYYY, which is not the valid MySQL date format and this is why it returns an error.

To convert it to the right one you could do this:

$dateFormated = split('/', $date);
$date = $dateFormated[2].'-'.$dateFormated[0].'-'.$dateFormated[1];

Then you will get formatted date that will be valid MySQL format, which is YYYY-MM-DD, i.e. 2012-08-25

I would also recommend using mysql_real_escape_string as you insert data into database to prevent SQL injections as a quick solution or better use PDO or MySQLi.

Your insert query using mysql_real_escape_string should rather look like this:

$sql = mysql_query( "INSERT INTO user_date VALUE( '', '" .mysql_real_escape_string($name). "', '" .mysql_real_escape_string($date). "'" ) or die ( mysql_error() );

The program can't start because cygwin1.dll is missing... in Eclipse CDT

This error message means that Windows isn't able to find "cygwin1.dll". The Programs that the Cygwin gcc create depend on this DLL. The file is part of cygwin , so most likely it's located in C:\cygwin\bin. To fix the problem all you have to do is add C:\cygwin\bin (or the location where cygwin1.dll can be found) to your system path. Alternatively you can copy cygwin1.dll into your Windows directory.

There is a nice tool called DependencyWalker that you can download from http://www.dependencywalker.com . You can use it to check dependencies of executables, so if you inspect your generated program it tells you which dependencies are missing and which are resolved.

How can I configure Logback to log different levels for a logger to different destinations?

okay, here is my favorite xml way of doing it. I do this for the eclipse version so I can

click on stuff to take me to the log statements and
see info and below in black and warn/severe in red

and for some reason SO is not showing this all properly but most seems to be there...

<configuration scan="true" scanPeriod="30 seconds">

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">      
          <evaluator class="ch.qos.logback.classic.boolex.GEventEvaluator"> 
            <expression>
               e.level.toInt() &lt;= INFO.toInt()
            </expression>
          </evaluator>
          <OnMismatch>DENY</OnMismatch>
          <OnMatch>NEUTRAL</OnMatch>
        </filter>

        <encoder>
            <pattern>%date{ISO8601} %X{sessionid}-%X{user} %caller{1} %-4level: %message%n</pattern>
        </encoder>
    </appender>

    <appender name="STDERR" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> 
            <level>warn</level>
        </filter>

        <encoder>
            <pattern>%date{ISO8601} %X{sessionid}-%X{user} %caller{1} %-4level: %message%n</pattern>
        </encoder>
        <target>System.err</target>
    </appender>

    <root>
        <level value="INFO" />
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="STDERR"/>
    </root>
</configuration>

How to get response using cURL in PHP

The crux of the solution is setting

CURLOPT_RETURNTRANSFER => true

then

$response = curl_exec($ch);

CURLOPT_RETURNTRANSFER tells PHP to store the response in a variable instead of printing it to the page, so $response will contain your response. Here's your most basic working code (I think, didn't test it):

// init curl object        
$ch = curl_init();

// define options
$optArray = array(
    CURLOPT_URL => 'http://www.google.com',
    CURLOPT_RETURNTRANSFER => true
);

// apply those options
curl_setopt_array($ch, $optArray);

// execute request and get response
$result = curl_exec($ch);

Can't Find Theme.AppCompat.Light for New Android ActionBar Support

The accepted solution used to work for me once, but not now. I had to re-create a hello-world of the same kind (!) in a new workspace, made it compile, and then copied all directories, including .hg and .hgignore. hg diff shows:

-        android:targetSdkVersion="19" />
+        android:targetSdkVersion="21" />

Binary file libs/android-support-v4.jar has changed

It looks like Eclipse wants to compile for API 21 and fails to do anything with API 19. Darkly.

How may I reference the script tag that loaded the currently-executing script?

Probably the easiest thing to do would be to give your scrip tag an id attribute.

Windows equivalent of linux cksum command

In combination of answers of @Cassian and @Hllitec and from https://stackoverflow.com/a/42706309/1001717 here my solution, where I put (only!) the checksum value into a variable for further processing:

for /f "delims=" %i in ('certutil -v -hashfile myPackage.nupkg SHA256 ^| find /i /v "sha256" ^| find /i /v "certutil"') do set myVar=%i

To test the output you can add a piped echo command with the var:

for /f "delims=" %i in ('certutil -v -hashfile myPackage.nupkg SHA256 ^| find /i /v "sha256" ^| find /i /v "certutil"') do set myVar=%i | echo %myVar%

A bit off-topic, but FYI: I used this before uploading my NuGet package to Artifactory. BTW. as alternative you can use JFrog CLI, where checksum is calculated automatically.

Run bash command on jenkins pipeline

The Groovy script you provided is formatting the first line as a blank line in the resultant script. The shebang, telling the script to run with /bin/bash instead of /bin/sh, needs to be on the first line of the file or it will be ignored.

So instead, you should format your Groovy like this:

stage('Setting the variables values') {
    steps {
         sh '''#!/bin/bash
                 echo "hello world" 
         '''
    }
}

And it will execute with /bin/bash.

How to recover the deleted files using "rm -R" command in linux server?

Not possible with standard unix commands. You might have luck with a file recovery utility. Also, be aware, using rm changes the table of contents to mark those blocks as available to be overwritten, so simply using your computer right now risks those blocks being overwritten permanently. If it's critical data, you should turn off the computer before the file sectors gets overwritten. Good luck!

Some restore utility: http://www.ubuntugeek.com/recover-deleted-files-with-foremostscalpel-in-ubuntu.html

Forum where this was previously answered: http://webcache.googleusercontent.com/search?q=cache:m4hiPw-_GekJ:ubuntuforums.org/archive/index.php/t-1134955.html+&cd=1&hl=en&ct=clnk&gl=us

How to convert a Kotlin source file to a Java source file

To convert a Kotlin source file to a Java source file you need to (when you in Android Studio):

Press Cmd-Shift-A on a Mac, or press Ctrl-Shift-A on a Windows machine.
Type the action you're looking for: Kotlin Bytecode and choose Show Kotlin Bytecode from menu.

Press Decompile button on the top of Kotlin Bytecode panel.

Now you get a Decompiled Java file along with Kotlin file in a adjacent tab:

Should each and every table have a primary key?

Disagree with the suggested answer. The short answer is: NO.

The purpose of the primary key is to uniquely identify a row on the table in order to form a relationship with another table. Traditionally, an auto-incremented integer value is used for this purpose, but there are variations to this.

There are cases though, for example logging time-series data, where the existence of a such key is simply not needed and just takes up memory. Making a row unique is simply ...not required!

A small example: Table A: LogData

Columns:  DateAndTime, UserId, AttribA, AttribB, AttribC etc...

No Primary Key needed.

Table B: User

Columns: Id, FirstName, LastName etc.

Primary Key (Id) needed in order to be used as a "foreign key" to LogData table.

Auto refresh code in HTML using meta tags

You're using smart quotes. That is, instead of standard quotation marks ("), you are using curly quotes (”). This happens automatically with Microsoft Word and other word processors to make things look prettier, but it also mangles HTML. Make sure to code in a plain text editor, like Notepad or Notepad2.

<html>
  <head>
    <title>HTML in 10 Simple Steps or Less</title>
    <meta http-equiv="refresh" content="5"> <!-- See the difference? -->
  </head>
  <body>
  </body>
</html>

Determine the number of NA values in a column

In the interests of completeness you can also use the useNA argument in table. For example table(df$col, useNA="always") will count all of non NA cases and the NA ones.

Python equivalent for HashMap

You need a dict:

my_dict = {'cheese': 'cake'}

Example code (from the docs):

>>> a = dict(one=1, two=2, three=3)
>>> b = {'one': 1, 'two': 2, 'three': 3}
>>> c = dict(zip(['one', 'two', 'three'], [1, 2, 3]))
>>> d = dict([('two', 2), ('one', 1), ('three', 3)])
>>> e = dict({'three': 3, 'one': 1, 'two': 2})
>>> a == b == c == d == e
True

You can read more about dictionaries here.

Is there a SELECT ... INTO OUTFILE equivalent in SQL Server Management Studio?

In SSMS, "Query" menu item... "Results to"... "Results to File"

Shortcut = CTRL+shift+F

You can set it globally too

"Tools"... "Options"... "Query Results"... "SQL Server".. "Default destination" drop down

Edit: after comment

In SSMS, "Query" menu item... "SQLCMD" mode

This allows you to run "command line" like actions.

A quick test in my SSMS 2008

:OUT c:\foo.txt
SELECT * FROM sys.objects

Edit, Sep 2012

:OUT c:\foo.txt
SET NOCOUNT ON;SELECT * FROM sys.objects

Marquee text in Android

Just put these params to your TextView - It works :D

android:singleLine="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"
android:scrollHorizontally="true"
android:focusable="true"
android:focusableInTouchMode="true"

And you also need to setSelected(true):

my_TextView.setSelected(true);

Greetings, Christopher

What does the "~" (tilde/squiggle/twiddle) CSS selector mean?

It is General sibling combinator and is explained in @Salaman's answer very well.

What I did miss is Adjacent sibling combinator which is + and is closely related to ~.

example would be

.a + .b {
  background-color: #ff0000;
}

<ul>
  <li class="a">1st</li>
  <li class="b">2nd</li>
  <li>3rd</li>
  <li class="b">4th</li>
  <li class="a">5th</li>
</ul>

Matches elements that are .b
Are adjacent to .a
After .a in HTML

In example above it will mark 2nd li but not 4th.

_x000D_

   .a + .b {_x000D_
     background-color: #ff0000;_x000D_
   }

_x000D_

<ul>_x000D_
  <li class="a">1st</li>_x000D_
  <li class="b">2nd</li>_x000D_
  <li>3rd</li>_x000D_
  <li class="b">4th</li>_x000D_
  <li class="a">5th</li>_x000D_
</ul>

_x000D_

JSFiddle

JavaScript global event mechanism

How to Catch Unhandled Javascript Errors

Assign the window.onerror event to an event handler like:

<script type="text/javascript">
window.onerror = function(msg, url, line, col, error) {
   // Note that col & error are new to the HTML 5 spec and may not be 
   // supported in every browser.  It worked for me in Chrome.
   var extra = !col ? '' : '\ncolumn: ' + col;
   extra += !error ? '' : '\nerror: ' + error;

   // You can view the information in an alert to see things working like this:
   alert("Error: " + msg + "\nurl: " + url + "\nline: " + line + extra);

   // TODO: Report this error via ajax so you can keep track
   //       of what pages have JS issues

   var suppressErrorAlert = true;
   // If you return true, then error alerts (like in older versions of 
   // Internet Explorer) will be suppressed.
   return suppressErrorAlert;
};
</script>

As commented in the code, if the return value of window.onerror is true then the browser should suppress showing an alert dialog.

When does the window.onerror Event Fire?

In a nutshell, the event is raised when either 1.) there is an uncaught exception or 2.) a compile time error occurs.

uncaught exceptions

throw "some messages"

call_something_undefined();

cross_origin_iframe.contentWindow.document;, a security exception

compile error

<script>{</script>

<script>for(;)</script>

<script>"oops</script>

setTimeout("{", 10);, it will attempt to compile the first argument as a script

Browsers supporting window.onerror

Chrome 13+
Firefox 6.0+
Internet Explorer 5.5+
Opera 11.60+
Safari 5.1+

Screenshot:

Example of the onerror code above in action after adding this to a test page:

<script type="text/javascript">
call_something_undefined();
</script>

Javascript alert showing error information detailed by the window.onerror event

Example for AJAX error reporting

var error_data = {
    url: document.location.href,
};

if(error != null) {
    error_data['name'] = error.name; // e.g. ReferenceError
    error_data['message'] = error.line;
    error_data['stack'] = error.stack;
} else {
    error_data['msg'] = msg;
    error_data['filename'] = filename;
    error_data['line'] = line;
    error_data['col'] = col;
}

var xhr = new XMLHttpRequest();

xhr.open('POST', '/ajax/log_javascript_error');
xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.onload = function() {
    if (xhr.status === 200) {
        console.log('JS error logged');
    } else if (xhr.status !== 200) {
        console.error('Failed to log JS error.');
        console.error(xhr);
        console.error(xhr.status);
        console.error(xhr.responseText);
    }
};
xhr.send(JSON.stringify(error_data));

JSFiddle:

https://jsfiddle.net/nzfvm44d/

References:

converting date time to 24 hour format

Try this:

Date date=new Date("12/12/11 8:22:09 PM");    
System.out.println("Time in 24Hours ="+new SimpleDateFormat("HH:mm").format(date));

How to show the last queries executed on MySQL?

You can do the flowing thing for monitoring mysql query logs.

Open mysql configuration file my.cnf

sudo nano /etc/mysql/my.cnf

Search following lines under a [mysqld] heading and uncomment these lines to enable log

general_log_file        = /var/log/mysql/mysql.log
general_log             = 1

Restart your mysql server for reflect changes

sudo service mysql start

Monitor mysql server log with following command in terminal

tail -f /var/log/mysql/mysql.log

How to call Stored Procedure in a View?

Easiest solution that I might have found is to create a table from the data you get from the SP. Then create a view from that:

Insert this at the last step when selecting data from the SP. SELECT * into table1 FROM #Temp

create view vw_view1 as select * from table1

How do I use arrays in C++?

Assignment

For no particular reason, arrays cannot be assigned to one another. Use std::copy instead:

#include <algorithm>

// ...

int a[8] = {2, 3, 5, 7, 11, 13, 17, 19};
int b[8];
std::copy(a + 0, a + 8, b);

This is more flexible than what true array assignment could provide because it is possible to copy slices of larger arrays into smaller arrays. std::copy is usually specialized for primitive types to give maximum performance. It is unlikely that std::memcpy performs better. If in doubt, measure.

Although you cannot assign arrays directly, you can assign structs and classes which contain array members. That is because array members are copied memberwise by the assignment operator which is provided as a default by the compiler. If you define the assignment operator manually for your own struct or class types, you must fall back to manual copying for the array members.

Parameter passing

Arrays cannot be passed by value. You can either pass them by pointer or by reference.

Pass by pointer

Since arrays themselves cannot be passed by value, usually a pointer to their first element is passed by value instead. This is often called "pass by pointer". Since the size of the array is not retrievable via that pointer, you have to pass a second parameter indicating the size of the array (the classic C solution) or a second pointer pointing after the last element of the array (the C++ iterator solution):

#include <numeric>
#include <cstddef>

int sum(const int* p, std::size_t n)
{
    return std::accumulate(p, p + n, 0);
}

int sum(const int* p, const int* q)
{
    return std::accumulate(p, q, 0);
}

As a syntactic alternative, you can also declare parameters as T p[], and it means the exact same thing as T* p in the context of parameter lists only:

int sum(const int p[], std::size_t n)
{
    return std::accumulate(p, p + n, 0);
}

You can think of the compiler as rewriting T p[] to T *p in the context of parameter lists only. This special rule is partly responsible for the whole confusion about arrays and pointers. In every other context, declaring something as an array or as a pointer makes a huge difference.

Unfortunately, you can also provide a size in an array parameter which is silently ignored by the compiler. That is, the following three signatures are exactly equivalent, as indicated by the compiler errors:

int sum(const int* p, std::size_t n)

// error: redefinition of 'int sum(const int*, size_t)'
int sum(const int p[], std::size_t n)

// error: redefinition of 'int sum(const int*, size_t)'
int sum(const int p[8], std::size_t n)   // the 8 has no meaning here

Pass by reference

Arrays can also be passed by reference:

int sum(const int (&a)[8])
{
    return std::accumulate(a + 0, a + 8, 0);
}

In this case, the array size is significant. Since writing a function that only accepts arrays of exactly 8 elements is of little use, programmers usually write such functions as templates:

template <std::size_t n>
int sum(const int (&a)[n])
{
    return std::accumulate(a + 0, a + n, 0);
}

Note that you can only call such a function template with an actual array of integers, not with a pointer to an integer. The size of the array is automatically inferred, and for every size n, a different function is instantiated from the template. You can also write quite useful function templates that abstract from both the element type and from the size.

Splitting strings using a delimiter in python

So, your input is 'dan|warrior|54' and you want "warrior". You do this like so:

>>> dan = 'dan|warrior|54'
>>> dan.split('|')[1]
"warrior"

How to get commit history for just one branch?

I know it's very late for this one... But here is a (not so simple) oneliner to get what you were looking for:

git show-branch --all 2>/dev/null | grep -E "\[$(git branch | grep -E '^\*' | awk '{ printf $2 }')" | tail -n+2 | sed -E "s/^[^\[]*?\[/[/"

We are listing commits with branch name and relative positions to actual branch states with git show-branch (sending the warnings to /dev/null).
Then we only keep those with our branch name inside the bracket with grep -E "\[$BRANCH_NAME".
Where actual $BRANCH_NAME is obtained with git branch | grep -E '^\*' | awk '{ printf $2 }' (the branch with a star, echoed without that star).
From our results, we remove the redundant line at the beginning with tail -n+2.
And then, we fianlly clean up the output by removing everything preceding [$BRANCH_NAME] with sed -E "s/^[^\[]*?\[/[/".

Rendering a template variable as HTML

If you don't want the HTML to be escaped, look at the safe filter and the autoescape tag:

safe:

{{ myhtml |safe }}

autoescape:

{% autoescape off %}
    {{ myhtml }}
{% endautoescape %}

CSS z-index not working (position absolute)

This is because of the Stacking Context, setting a z-index will make it apply to all children as well.

You could make the two <div>s siblings instead of descendants.

<div class="absolute"></div>
<div id="relative"></div>

http://jsfiddle.net/P7c9q/3/

Most efficient way to get table row count

Following is the most performant way to find the next AUTO_INCREMENT value for a table. This is quick even on databases housing millions of tables, because it does not require querying the potentially large information_schema database.

mysql> SHOW TABLE STATUS LIKE 'table_name';
// Look for the Auto_increment column

However, if you must retrieve this value in a query, then to the information_schema database you must go.

SELECT `AUTO_INCREMENT`
FROM   INFORMATION_SCHEMA.TABLES
WHERE  TABLE_SCHEMA = 'DatabaseName'
AND    TABLE_NAME   = 'TableName';

Insert new column into table in sqlite?

I was facing the same problem and the second method proposed in the accepted answer, as noted in the comments, can be problematic when dealing with foreign keys.

My workaround is to export the database to a sql file making sure that the INSERT statements include column names. I do it using DB Browser for SQLite which has an handy feature for that. After that you just have to edit the create table statement and insert the new column where you want it and recreate the db.

In *nix like systems is just something along the lines of

cat db.sql | sqlite3 database.db

I don't know how feasible this is with very big databases, but it worked in my case.

Convert object of any type to JObject with Json.NET

JObject implements IDictionary, so you can use it that way. For ex,

var cycleJson  = JObject.Parse(@"{""name"":""john""}");

//add surname
cycleJson["surname"] = "doe";

//add a complex object
cycleJson["complexObj"] = JObject.FromObject(new { id = 1, name = "test" });

So the final json will be

{
  "name": "john",
  "surname": "doe",
  "complexObj": {
    "id": 1,
    "name": "test"
  }
}

You can also use dynamic keyword

dynamic cycleJson  = JObject.Parse(@"{""name"":""john""}");
cycleJson.surname = "doe";
cycleJson.complexObj = JObject.FromObject(new { id = 1, name = "test" });

What's the difference between 'int?' and 'int' in C#?

int belongs to System.ValueType and cannot have null as a value. When dealing with databases or other types where the elements can have a null value, it might be useful to check if the element is null. That is when int? comes into play. int? is a nullable type which can have values ranging from -2147483648 to 2147483648 and null.

Reference: https://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx

What is the meaning of "operator bool() const"

As the others have said, it's for type conversion, in this case to a bool. For example:

class A {
    bool isItSafe;

public:
    operator bool() const
    {
        return isItSafe;
    }

    ...
};

Now I can use an object of this class as if it's a boolean:

A a;
...
if (a) {
    ....
}

How to use if-else option in JSTL

I got away with simply using two if tags, thought I'd add an answer in case it's of use to anyone else:

<c:if test="${condition}">
  ...
</c:if>
<c:if test="${!condition}">
  ...
</c:if>

whilst technically not an if-else per se, the behaviour is the same and avoids the clunky approach of using the choose tag, so depending on how complex your requirement is this might be preferable.

How do I raise the same Exception with a custom message in Python?

If you're lucky enough to only support python 3.x, this really becomes a thing of beauty :)

raise from

We can chain the exceptions using raise from.

try:
    1 / 0
except ZeroDivisionError as e:
    raise Exception('Smelly socks') from e

In this case, the exception your caller would catch has the line number of the place where we raise our exception.

Traceback (most recent call last):
  File "test.py", line 2, in <module>
    1 / 0
ZeroDivisionError: division by zero

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "test.py", line 4, in <module>
    raise Exception('Smelly socks') from e
Exception: Smelly socks

Notice the bottom exception only has the stacktrace from where we raised our exception. Your caller could still get the original exception by accessing the __cause__ attribute of the exception they catch.

with_traceback

Or you can use with_traceback.

try:
    1 / 0
except ZeroDivisionError as e:
    raise Exception('Smelly socks').with_traceback(e.__traceback__)

Using this form, the exception your caller would catch has the traceback from where the original error occurred.

Traceback (most recent call last):
  File "test.py", line 2, in <module>
    1 / 0
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 4, in <module>
    raise Exception('Smelly socks').with_traceback(e.__traceback__)
  File "test.py", line 2, in <module>
    1 / 0
Exception: Smelly socks

Notice the bottom exception has the line where we performed the invalid division as well as the line where we reraise the exception.

How to revert initial git commit?

You just need to delete the branch you are on. You can't use git branch -D as this has a safety check against doing this. You can use update-ref to do this.

git update-ref -d HEAD

Do not use rm -rf .git or anything like this as this will completely wipe your entire repository including all other branches as well as the branch that you are trying to reset.

how to convert date to a format `mm/dd/yyyy`

Use CONVERT with the Value specifier of 101, whilst casting your data to date:

CONVERT(VARCHAR(10), CAST(Created_TS AS DATE), 101)

Programs & Examples On #Rexx

how to bind datatable to datagridview in c#

How can jQuery deferred be used?

Convert Enum to String

how to convert a string to a bool

Creating a textarea with auto-resize

How to change the icon of an Android app in Eclipse?

Redirect to Action by parameter mvc

Loading existing .html file with android WebView

How to convert integer to decimal in SQL Server query?

imagecreatefromjpeg and similar functions are not working in PHP

How to use NULL or empty string in SQL

Finding the position of bottom of a div with jquery

Gridview with two columns and auto resized images

Android: Is it possible to display video thumbnails?

Convert String[] to comma separated string in java

When I run `npm install`, it returns with `ERR! code EINTEGRITY` (npm 5.3.0)

Display calendar to pick a date in java

Which websocket library to use with Node.js?

Property 'catch' does not exist on type 'Observable<any>'

background-size in shorthand background property (CSS3)

Download history stock prices automatically from yahoo finance in python

How to bind list to dataGridView?

java.lang.UnsupportedClassVersionError: Bad version number in .class file?

Error message "unreported exception java.io.IOException; must be caught or declared to be thrown"

How do I deal with special characters like \^$.?*|+()[{ in my regex?

How to search and replace text in a file?

Copy entire directory contents to another directory?

CORS jQuery AJAX request

Does C# support multiple inheritance?

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

Deserialize JSON array(or list) in C#

WRONGTYPE Operation against a key holding the wrong kind of value php

MySQL INNER JOIN select only one row from second table

How many bits or bytes are there in a character?

Why does overflow:hidden not work in a <td>?

Add jars to a Spark Job - spark-submit

ClassPath:

Separation character:

File distribution:

Accepted URI's for files

Affected options:

Ansible: create a user with sudo privileges

Conditional Logic on Pandas DataFrame

PLS-00201 - identifier must be declared

Get GMT Time in Java

cannot be cast to java.lang.Comparable

How to float a div over Google Maps?

How can I make Bootstrap 4 columns all the same height?

ES6 Class Multiple inheritance

Expressions vs declarations

Using class expressions to create mixins

More elegant "ps aux | grep -v grep"

How to display UTF-8 characters in phpMyAdmin?

How do I restart my C# WinForm Application?

set gvim font in .vimrc file

How can I output leading zeros in Ruby?

Download and install an ipa from self hosted url on iOS

Repair all tables in one go

Using Chrome, how to find to which events are bound to an element

Have Excel formulas that return 0, make the result blank

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