Check mySQL version on Mac 10.8.5

Or just call mysql command with --version option.

mysql --version

Filter output in logcat by tagname

Do not depend on ADB shell, just treat it (the adb logcat) a normal linux output and then pip it:

$ adb shell logcat | grep YouTag
# just like: 
$ ps -ef | grep your_proc

How to read PDF files using Java?

PDFBox contains tools for text extraction.

iText has more low-level support for text manipulation, but you'd have to write a considerable amount of code to get text extraction.

iText in Action contains a good overview of the limitations of text extraction from PDF, regardless of the library used (Section 18.2: Extracting and editing text), and a convincing explanation why the library does not have text extraction support. In short, it's relatively easy to write a code that will handle simple cases, but it's basically impossible to extract text from PDF in general.

How to find the operating system version using JavaScript?

You can find the OS name and version in the navigator object, as others have answered. The standard, cross-browser place to find this information is in the navigator.userAgent property. However, user agent strings vary widely by OS and browser.

So, I created a script to encapsulate this logic and report on the most common OSes and browsers in a familiar way, like http://www.whatsmybrowser.org.

I open-sourced the script and uploaded it to github, https://github.com/keithws/browser-report. Pull requests are welcome!

What is the function __construct used for?

__construct was introduced in PHP5 and it is the right way to define your, well, constructors (in PHP4 you used the name of the class for a constructor). You are not required to define a constructor in your class, but if you wish to pass any parameters on object construction then you need one.

An example could go like this:

class Database {
  protected $userName;
  protected $password;
  protected $dbName;

  public function __construct ( $UserName, $Password, $DbName ) {
    $this->userName = $UserName;
    $this->password = $Password;
    $this->dbName = $DbName;
  }
}

// and you would use this as:
$db = new Database ( 'user_name', 'password', 'database_name' );

Everything else is explained in the PHP manual: click here

Get a random boolean in python?

u could try this it produces randomly generated array of true and false :

a=[bool(i) for i in np.array(np.random.randint(0,2,10))]

out: [True, True, True, True, True, False, True, False, True, False]

Restore a deleted file in the Visual Studio Code Recycle Bin

who still facing the problem on linux and didnt find it on trash try this solution

https://github.com/Microsoft/vscode/issues/32078#issuecomment-434393058

find / -name "delete_file_name"

Pretty-print a Map in Java

public void printMapV2 (Map <?, ?> map) {
    StringBuilder sb = new StringBuilder(128);
    sb.append("{");
    for (Map.Entry<?,?> entry : map.entrySet()) {
        if (sb.length()>1) {
            sb.append(", ");
        }
        sb.append(entry.getKey()).append("=").append(entry.getValue());
    }
    sb.append("}");
    System.out.println(sb);
}

Include .so library in apk in android studio

To include native libraries you need:

create "jar" file with special structure containing ".so" files;
include that file in dependencies list.

To create jar file, use the following snippet:

task nativeLibsToJar(type: Zip, description: 'create a jar archive of the native libs') {
    destinationDir file("$buildDir/native-libs")
    baseName 'native-libs'
    extension 'jar'
    from fileTree(dir: 'libs', include: '**/*.so')
    into 'lib/'
}

tasks.withType(Compile) {
    compileTask -> compileTask.dependsOn(nativeLibsToJar)
}

To include resulting file, paste the following line into "dependencies" section in "build.gradle" file:

compile fileTree(dir: "$buildDir/native-libs", include: 'native-libs.jar')

Are there other whitespace codes like &nbsp for half-spaces, em-spaces, en-spaces etc useful in HTML?

I used this Unicode Decimal Code ‌ and worked. more details

jQuery find events handlers registered with an object

To check for events on an element:

var events = $._data(element, "events")

Note that this will only work with direct event handlers, if you are using $(document).on("event-name", "jq-selector", function() { //logic }), you will want to see the getEvents function at the bottom of this answer

For example:

 var events = $._data(document.getElementById("myElemId"), "events")

 var events = $._data($("#myElemId")[0], "events")

Full Example:

<html>
    <head>
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
        <script>
            $(function() {
                $("#textDiv").click(function() {
                    //Event Handling
                });
                var events = $._data(document.getElementById('textDiv'), "events");
                var hasEvents = (events != null);
            });
        </script>
    </head>
    <body>
        <div id="textDiv">Text</div>
    </body>
</html>

A more complete way to check, that includes dynamic listeners, installed with $(document).on

function getEvents(element) {
    var elemEvents = $._data(element, "events");
    var allDocEvnts = $._data(document, "events");
    for(var evntType in allDocEvnts) {
        if(allDocEvnts.hasOwnProperty(evntType)) {
            var evts = allDocEvnts[evntType];
            for(var i = 0; i < evts.length; i++) {
                if($(element).is(evts[i].selector)) {
                    if(elemEvents == null) {
                        elemEvents = {};
                    }
                    if(!elemEvents.hasOwnProperty(evntType)) {
                        elemEvents[evntType] = [];
                    }
                    elemEvents[evntType].push(evts[i]);
                }
            }
        }
    }
    return elemEvents;
}

Example usage:

getEvents($('#myElemId')[0])

Make the image go behind the text and keep it in center using CSS

Make it a background image that is centered.

.wrapper {background:transparent url(yourimage.jpg) no-repeat center center;}

<div class="wrapper">
 ...input boxes and labels and submit button here
</div>

Delete files or folder recursively on Windows CMD

dir /b %temp% >temp.list
for /f "delims=" %%a in (temp.list) do call rundll32.exe advpack.dll,DelNodeRunDLL32 "%temp%\%%a"

Post-increment and Pre-increment concept?

All four answers so far are incorrect, in that they assert a specific order of events.

Believing that "urban legend" has led many a novice (and professional) astray, to wit, the endless stream of questions about Undefined Behavior in expressions.

So.

For the built-in C++ prefix operator,

++x

increments x and produces (as the expression's result) x as an lvalue, while

x++

increments x and produces (as the expression's result) the original value of x.

In particular, for x++ there is no no time ordering implied for the increment and production of original value of x. The compiler is free to emit machine code that produces the original value of x, e.g. it might be present in some register, and that delays the increment until the end of the expression (next sequence point).

Folks who incorrectly believe the increment must come first, and they are many, often conclude from that certain expressions must have well defined effect, when they actually have Undefined Behavior.

Delete specific line number(s) from a text file using sed?

You can delete a particular single line with its line number by

sed -i '33d' file

This will delete the line on 33 line number and save the updated file.

Is key-value observation (KVO) available in Swift?

(Edited to add new info): consider whether using the Combine framework can help you accomplish what you wanted, rather than using KVO

Yes and no. KVO works on NSObject subclasses much as it always has. It does not work for classes that don't subclass NSObject. Swift does not (currently at least) have its own native observation system.

(See comments for how to expose other properties as ObjC so KVO works on them)

See the Apple Documentation for a full example.

how to download image from any web page in java

If you want to save the image and you know its URL you can do this:

try(InputStream in = new URL("http://example.com/image.jpg").openStream()){
    Files.copy(in, Paths.get("C:/File/To/Save/To/image.jpg"));
}

You will also need to handle the IOExceptions which may be thrown.

Binding a Button's visibility to a bool value in ViewModel

2 way conversion in c# from boolean to visibility

using System;
using System.Windows;
using System.Windows.Data;

namespace FaceTheWall.converters
{
    class BooleanToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is Boolean && (bool)value)
            {
                return Visibility.Visible;
            }
            return Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is Visibility && (Visibility)value == Visibility.Visible)
            {
                return true;
            }
            return false;
        }
    }
}

How to stop/shut down an elasticsearch node?

The Head plugin for Elasticsearch provides a great web based front end for Elasticsearch administration, including shutting down nodes. It can run any Elasticsearch commands as well.

Function inside a function.?

X returns (value +3), while Y returns (value*2)

Given a value of 4, this means (4+3) * (4*2) = 7 * 8 = 56.

Although functions are not limited in scope (which means that you can safely 'nest' function definitions), this particular example is prone to errors:

1) You can't call y() before calling x(), because function y() won't actually be defined until x() has executed once.

2) Calling x() twice will cause PHP to redeclare function y(), leading to a fatal error:

Fatal error: Cannot redeclare y()

The solution to both would be to split the code, so that both functions are declared independent of each other:

function x ($y) 
{
  return($y+3);
}

function y ($z)
{
  return ($z*2);
}

This is also a lot more readable.

Running Python from Atom

Download and Install package here: https://atom.io/packages/script

To execute the python command in atom use the below shortcuts:

For Windows/Linux, it's SHIFT + Ctrl + B OR Ctrl + SHIFT + B

If you're on Mac, press ? + I

Locate Git installation folder on Mac OS X

Usually some of the applications have been known to take it from the Xcode.app path also: /Applications/Xcode.app/Contents/Developer/usr/bin/

Coda 2, prefers this path than the soft link at /usr/bin.

Excel CSV. file with more than 1,048,576 rows of data

I would suggest to load the .CSV file in MS-Access.

With MS-Excel you can then create a data connection to this source (without actual loading the records in a worksheet) and create a connected pivot table. You then can have virtually unlimited number of lines in your table (depending on processor and memory: I have now 15 mln lines with 3 Gb Memory).

Additional advantage is that you can now create an aggregate view in MS-Access. In this way you can create overviews from hundreds of millions of lines and then view them in MS-Excel (beware of the 2Gb limitation of NTFS files in 32 bits OS).

hibernate - get id after save object

The session.save(object) returns the id of the object, or you could alternatively call the id getter method after performing a save.

Save() return value:

Serializable save(Object object) throws HibernateException

Returns:

the generated identifier

Getter method example:

UserDetails entity:

@Entity
public class UserDetails {
    @Id
    @GeneratedValue
    private int id;
    private String name;

    // Constructor, Setters & Getters
}

Logic to test the id's :

Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.getTransaction().begin();
UserDetails user1 = new UserDetails("user1");
UserDetails user2 = new UserDetails("user2");

//int userId = (Integer) session.save(user1); // if you want to save the id to some variable

System.out.println("before save : user id's = "+user1.getId() + " , " + user2.getId());

session.save(user1);
session.save(user2);

System.out.println("after save : user id's = "+user1.getId() + " , " + user2.getId());

session.getTransaction().commit();

Output of this code:

before save : user id's = 0 , 0

after save : user id's = 1 , 2

As per this output, you can see that the id's were not set before we save the UserDetails entity, once you save the entities then Hibernate set's the id's for your objects - user1 and user2

Extreme wait-time when taking a SQL Server database offline

In my case, the database was related to an old Sharepoint install. Stopping and disabling related services in the server manager "unhung" the take offline action, which had been running for 40 minutes, and it completed immediately.

You may wish to check if any services are currently utilizing the database.

How to edit log message already committed in Subversion?

svnadmin setlog /path/to/repository -r revision_number --bypass-hooks message_file.txt

Assigning a function to a variable

when you perform y=x() you are actually assigning y to the result of calling the function object x and the function has a return value of None. Function calls in python are performed using (). To assign x to y so you can call y just like you would x you assign the function object x to y like y=x and call the function using y()

AppCompat v7 r21 returning error in values.xml?

my solucion is compile with other version

build.gradle (app)

compileSdkVersion 21

Good Luck

How to my "exe" from PyCharm project

You cannot directly save a Python file as an exe and expect it to work -- the computer cannot automatically understand whatever code you happened to type in a text file. Instead, you need to use another program to transform your Python code into an exe.

I recommend using a program like Pyinstaller. It essentially takes the Python interpreter and bundles it with your script to turn it into a standalone exe that can be run on arbitrary computers that don't have Python installed (typically Windows computers, since Linux tends to come pre-installed with Python).

To install it, you can either download it from the linked website or use the command:

pip install pyinstaller

...from the command line. Then, for the most part, you simply navigate to the folder containing your source code via the command line and run:

pyinstaller myscript.py

You can find more information about how to use Pyinstaller and customize the build process via the documentation.

You don't necessarily have to use Pyinstaller, though. Here's a comparison of different programs that can be used to turn your Python code into an executable.

Git: Remove committed file after push

Get the hash code of last commit.
- git log
Revert the commit
- git revert <hash_code_from_git_log>
Push the changes
- git push

check out in the GHR. you might get what ever you need, hope you this is useful

FormData.append("key", "value") is not working

New in Chrome 50+ and Firefox 39+ (resp. 44+):

formdata.entries() (combine with Array.from() for debugability)
formdata.get(key)
and more very useful methods

Original answer:

What I usually do to 'debug' a FormData object, is just send it (anywhere!) and check the browser logs (eg. Chrome devtools' Network tab).

You don't need a/the same Ajax framework. You don't need any details. Just send it:

var xhr = new XMLHttpRequest;
xhr.open('POST', '/', true);
xhr.send(data);

Easy.

What is the syntax for Typescript arrow functions with generics?

I to use this type of declaration:

const identity: { <T>(arg: T): T } = (arg) => arg;

It allows defining additional props to your function if you ever need to and in some cases, it helps keeping the function body cleaner from the generic definition.

If you don't need the additional props (namespace sort of thing), it can be simplified to:

const identity: <T>(arg: T) => T = (arg) => arg;

Better way to convert file sizes in Python

There is hurry.filesize that will take the size in bytes and make a nice string out if it.

>>> from hurry.filesize import size
>>> size(11000)
'10K'
>>> size(198283722)
'189M'

Or if you want 1K == 1000 (which is what most users assume):

>>> from hurry.filesize import size, si
>>> size(11000, system=si)
'11K'
>>> size(198283722, system=si)
'198M'

It has IEC support as well (but that wasn't documented):

>>> from hurry.filesize import size, iec
>>> size(11000, system=iec)
'10Ki'
>>> size(198283722, system=iec)
'189Mi'

Because it's written by the Awesome Martijn Faassen, the code is small, clear and extensible. Writing your own systems is dead easy.

Here is one:

mysystem = [
    (1024 ** 5, ' Megamanys'),
    (1024 ** 4, ' Lotses'),
    (1024 ** 3, ' Tons'), 
    (1024 ** 2, ' Heaps'), 
    (1024 ** 1, ' Bunches'),
    (1024 ** 0, ' Thingies'),
    ]

Used like so:

>>> from hurry.filesize import size
>>> size(11000, system=mysystem)
'10 Bunches'
>>> size(198283722, system=mysystem)
'189 Heaps'

Using regular expression in css?

I usually use * when I want to get all the strings that contain the wanted characters.

* used in regex, replaces all characters.

Used in SASS or CSS would be something like [id*="s"] and it will get all DOM elements with id "s......".

/* add red color to all div with id s .... elements */

div[id^="s"] {
    color: red;
}

Add new attribute (element) to JSON object using JavaScript

You can also use Object.assign from ECMAScript 2015. It also allows you to add nested attributes at once. E.g.:

const myObject = {};

Object.assign(myObject, {
    firstNewAttribute: {
        nestedAttribute: 'woohoo!'
    }
});

Ps: This will not override the existing object with the assigned attributes. Instead they'll be added. However if you assign a value to an existing attribute then it would be overridden.

Retrieving subfolders names in S3 bucket from boto3

The following works for me... S3 objects:

s3://bucket/
    form1/
       section11/
          file111
          file112
       section12/
          file121
    form2/
       section21/
          file211
          file112
       section22/
          file221
          file222
          ...
      ...
   ...

Using:

from boto3.session import Session
s3client = session.client('s3')
resp = s3client.list_objects(Bucket=bucket, Prefix='', Delimiter="/")
forms = [x['Prefix'] for x in resp['CommonPrefixes']]

we get:

form1/
form2/
...

With:

resp = s3client.list_objects(Bucket=bucket, Prefix='form1/', Delimiter="/")
sections = [x['Prefix'] for x in resp['CommonPrefixes']]

we get:

form1/section11/
form1/section12/

How would I get everything before a : in a string Python

I have benchmarked these various technics under Python 3.7.0 (IPython).

TLDR

fastest (when the split symbol c is known): pre-compiled regex.
fastest (otherwise): s.partition(c)[0].
safe (i.e., when c may not be in s): partition, split.
unsafe: index, regex.

Code

import string, random, re

SYMBOLS = string.ascii_uppercase + string.digits
SIZE = 100

def create_test_set(string_length):
    for _ in range(SIZE):
        random_string = ''.join(random.choices(SYMBOLS, k=string_length))
        yield (random.choice(random_string), random_string)

for string_length in (2**4, 2**8, 2**16, 2**32):
    print("\nString length:", string_length)
    print("  regex (compiled):", end=" ")
    test_set_for_regex = ((re.compile("(.*?)" + c).match, s) for (c, s) in test_set)
    %timeit [re_match(s).group() for (re_match, s) in test_set_for_regex]
    test_set = list(create_test_set(16))
    print("  partition:       ", end=" ")
    %timeit [s.partition(c)[0] for (c, s) in test_set]
    print("  index:           ", end=" ")
    %timeit [s[:s.index(c)] for (c, s) in test_set]
    print("  split (limited): ", end=" ")
    %timeit [s.split(c, 1)[0] for (c, s) in test_set]
    print("  split:           ", end=" ")
    %timeit [s.split(c)[0] for (c, s) in test_set]
    print("  regex:           ", end=" ")
    %timeit [re.match("(.*?)" + c, s).group() for (c, s) in test_set]

Results

String length: 16
  regex (compiled): 156 ns ± 4.41 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
  partition:        19.3 µs ± 430 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
  index:            26.1 µs ± 341 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split (limited):  26.8 µs ± 1.26 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split:            26.3 µs ± 835 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  regex:            128 µs ± 4.02 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)

String length: 256
  regex (compiled): 167 ns ± 2.7 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
  partition:        20.9 µs ± 694 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  index:            28.6 µs ± 2.73 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split (limited):  27.4 µs ± 979 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split:            31.5 µs ± 4.86 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  regex:            148 µs ± 7.05 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

String length: 65536
  regex (compiled): 173 ns ± 3.95 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
  partition:        20.9 µs ± 613 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
  index:            27.7 µs ± 515 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split (limited):  27.2 µs ± 796 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split:            26.5 µs ± 377 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  regex:            128 µs ± 1.5 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)

String length: 4294967296
  regex (compiled): 165 ns ± 1.2 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
  partition:        19.9 µs ± 144 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
  index:            27.7 µs ± 571 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split (limited):  26.1 µs ± 472 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  split:            28.1 µs ± 1.69 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
  regex:            137 µs ± 6.53 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)

No assembly found containing an OwinStartupAttribute Error

you may not have Configuration method in the class you mentioned in

<appSettings>
<add key="owin:AppStartup" value="WebApplication1.App_Start.Startup"/>

How to check if an element is visible with WebDriver

    try{
        if( driver.findElement(By.xpath("//div***")).isDisplayed()){
          System.out.println("Element is Visible");
        }
}
catch(NoSuchElementException e){
   else{
     System.out.println("Element is InVisible");
        }
}

What are the differences between git branch, fork, fetch, merge, rebase and clone?

Fork Vs. Clone - two words that both mean copy

Please see this diagram. _{^{(Originally from http://www.dataschool.io/content/images/2014/Mar/github1.png).}}

.-------------------------.     1. Fork     .-------------------------.
| Your GitHub repo        | <-------------- | Joe's GitHub repo       |
| github.com/you/coolgame |                 | github.com/joe/coolgame |
| ----------------------- | 7. Pull Request | ----------------------- |
| master -> c224ff7       | --------------> | master -> c224ff7 (c)   |
| anidea -> 884faa1 (a)   |                 | anidea -> 884faa1 (b)   |
'-------------------------'                 '-------------------------'
    |                 ^
    | 2. Clone        |
    |                 |
    |                 |
    |                 |
    |                 |
    |                 | 6. Push (anidea => origin/anidea)
    v                 |
.-------------------------.
| Your computer           |  3. Create branch 'anidea'
| $HOME/coolgame          |
| ----------------------- |  4. Update a file
| master -> c224ff7       |
| anidea -> 884faa1       |  5. Commit (to 'anidea')
'-------------------------'

(a) - after you have pushed it
(b) - after Joe has accepted it
(c) - eventually Joe might merge 'anidea' (make 'master -> 884faa1')

Fork

A copy to your remote repo (cloud) that links it to Joe's
A copy you can then clone to your local repo and F*%$-up
When you are done you can push back to your remote
You can then ask Joe if he wants to use it in his project by clicking pull-request

Clone

a copy to your local repo (harddrive)

Sorting HashMap by values

I extends a TreeMap and override entrySet() and values() methods. Key and value need to be Comparable.

Follow the code:

public class ValueSortedMap<K extends Comparable, V extends Comparable> extends TreeMap<K, V> {

    @Override
    public Set<Entry<K, V>> entrySet() {
        Set<Entry<K, V>> originalEntries = super.entrySet();
        Set<Entry<K, V>> sortedEntry = new TreeSet<Entry<K, V>>(new Comparator<Entry<K, V>>() {
            @Override
            public int compare(Entry<K, V> entryA, Entry<K, V> entryB) {
                int compareTo = entryA.getValue().compareTo(entryB.getValue());
                if(compareTo == 0) {
                    compareTo = entryA.getKey().compareTo(entryB.getKey());
                }
                return compareTo;
            }
        });
        sortedEntry.addAll(originalEntries);
        return sortedEntry;
    }

    @Override
    public Collection<V> values() {
        Set<V> sortedValues = new TreeSet<>(new Comparator<V>(){
            @Override
            public int compare(V vA, V vB) {
                return vA.compareTo(vB);
            }
        });
        sortedValues.addAll(super.values());
        return sortedValues;
    }
}

Unit Tests:

public class ValueSortedMapTest {

    @Test
    public void basicTest() {
        Map<String, Integer> sortedMap = new ValueSortedMap<>();
        sortedMap.put("A",3);
        sortedMap.put("B",1);
        sortedMap.put("C",2);

        Assert.assertEquals("{B=1, C=2, A=3}", sortedMap.toString());
    }

    @Test
    public void repeatedValues() {
        Map<String, Double> sortedMap = new ValueSortedMap<>();
        sortedMap.put("D",67.3);
        sortedMap.put("A",99.5);
        sortedMap.put("B",67.4);
        sortedMap.put("C",67.4);

        Assert.assertEquals("{D=67.3, B=67.4, C=67.4, A=99.5}", sortedMap.toString());
    }

}

Post multipart request with Android SDK

Update April 29th 2014:

My answer is kind of old by now and I guess you rather want to use some kind of high level library such as Retrofit.

Based on this blog I came up with the following solution: http://blog.tacticalnuclearstrike.com/2010/01/using-multipartentity-in-android-applications/

You will have to download additional libraries to get MultipartEntity running!

1) Download httpcomponents-client-4.1.zip from http://james.apache.org/download.cgi#Apache_Mime4J and add apache-mime4j-0.6.1.jar to your project.

2) Download httpcomponents-client-4.1-bin.zip from http://hc.apache.org/downloads.cgi and add httpclient-4.1.jar, httpcore-4.1.jar and httpmime-4.1.jar to your project.

3) Use the example code below.

private DefaultHttpClient mHttpClient;


public ServerCommunication() {
    HttpParams params = new BasicHttpParams();
    params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
    mHttpClient = new DefaultHttpClient(params);
}


public void uploadUserPhoto(File image) {

    try {

        HttpPost httppost = new HttpPost("some url");

        MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);  
        multipartEntity.addPart("Title", new StringBody("Title"));
        multipartEntity.addPart("Nick", new StringBody("Nick"));
        multipartEntity.addPart("Email", new StringBody("Email"));
        multipartEntity.addPart("Description", new StringBody(Settings.SHARE.TEXT));
        multipartEntity.addPart("Image", new FileBody(image));
        httppost.setEntity(multipartEntity);

        mHttpClient.execute(httppost, new PhotoUploadResponseHandler());

    } catch (Exception e) {
        Log.e(ServerCommunication.class.getName(), e.getLocalizedMessage(), e);
    }
}

private class PhotoUploadResponseHandler implements ResponseHandler<Object> {

    @Override
    public Object handleResponse(HttpResponse response)
            throws ClientProtocolException, IOException {

        HttpEntity r_entity = response.getEntity();
        String responseString = EntityUtils.toString(r_entity);
        Log.d("UPLOAD", responseString);

        return null;
    }

}

How to mark a method as obsolete or deprecated?

With ObsoleteAttribute you can to show the deprecated method. Obsolete attribute has three constructor:

[Obsolete]: is a no parameter constructor and is a default using this attribute.

[Obsolete(string message)]: in this format you can get message of why this method is deprecated.

[Obsolete(string message, bool error)]: in this format message is very explicit but error means, in compilation time, compiler must be showing error and cause to fail compiling or not.

What does file:///android_asset/www/index.html mean?

The URI "file:///android_asset/" points to YourProject/app/src/main/assets/.

Note: android_asset/ uses the singular (asset) and src/main/assets uses the plural (assets).

Suppose you have a file YourProject/app/src/main/assets/web_thing.html that you would like to display in a WebView. You can refer to it like this:

WebView webViewer = (WebView) findViewById(R.id.webViewer);
webView.loadUrl("file:///android_asset/web_thing.html");

The snippet above could be located in your Activity class, possibly in the onCreate method.

Here is a guide to the overall directory structure of an android project, that helped me figure out this answer.

Setting background colour of Android layout element

The answers above all are static. I thought I would provide a dynamic answer. The two files that will need to be in sync are the relative foo.xml with the layout and activity_bar.java which corresponds to the Java class corresponding to this R.layout.foo.

In foo.xml set an id for the entire layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/foo" .../>

And in activity_bar.java set the color in the onCreate():

public class activity_bar extends AppCompatActivty {

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

            //Set an id to the layout
        RelativeLayout currentLayout = 
                    (RelativeLayout) findViewById(R.id.foo);

        currentLayout.setBackgroundColor(Color.RED);
        ...
    }
    ...
}

I hope this helps.

CSS background opacity with rgba not working in IE 8

this worked for me to solve the problem in IE8:

-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=1)";

Cheers

find the array index of an object with a specific key value in underscore

you can use indexOf method from lodash

var tv = [{id:1},{id:2}]
var voteID = 2;
var data = _.find(tv, function(voteItem){ return voteItem.id == voteID; });
var index=_.indexOf(tv,data);

Entity Framework (EF) Code First Cascade Delete for One-to-Zero-or-One relationship

You could also disable the cascade delete convention in global scope of your application by doing this:

modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>()
modelBuilder.Conventions.Remove<ManyToManyCascadeDeleteConvention>()

Android - shadow on text?

You can do both in code and XML. Only 4 basic things to be set.

shadow color
Shadow Dx - it specifies the X-axis offset of shadow. You can give -/+ values, where -Dx draws a shadow on the left of text and +Dx on the right
shadow Dy - it specifies the Y-axis offset of shadow. -Dy specifies a shadow above the text and +Dy specifies below the text.
shadow radius - specifies how much the shadow should be blurred at the edges. Provide a small value if shadow needs to be prominent. Else otherwise.

e.g.

    android:shadowColor="@color/text_shadow_color"
    android:shadowDx="-2"
    android:shadowDy="2"
    android:shadowRadius="0.01"

This draws a prominent shadow on left-lower side of text. In code, you can add something like this;

    TextView item = new TextView(getApplicationContext());
    item.setText(R.string.text);
    item.setTextColor(getResources().getColor(R.color.general_text_color));
    item.setShadowLayer(0.01f, -2, 2,   getResources().getColor(R.color.text_shadow_color));

jQuery append and remove dynamic table row

Please try that:

<script>
$(document).ready(function(){
    var add = '<tr valign="top"><th scope="row"><label for="customFieldName">Custom Field</label></th><td>';
                add+= '<input type="text" class="code" id="customFieldName" name="customFieldName[]" value="" placeholder="Input Name" />&nbsp;&nbsp;&nbsp;';
                add+= '<input type="text" class="code" id="customFieldValue" name="customFieldValue[]" value="" placeholder="Input Value" />&nbsp;';
                add+= '<a href="javascript:void(0);" class="remCF">Remove</a></td></tr>';

    $(".addCF").click(function(){ $("#customFields").append(add); });

    $("#customFields").on('click','.remCF',function(){
        var inx = $('.remCF').index(this);
        $('tr').eq(inx+1).remove();
    });
});
</script>

ActiveRecord OR query

The MetaWhere plugin is completely amazing.

Easily mix OR's and AND's, join conditions on any association, and even specify OUTER JOIN's!

Post.where({sharing_level: Post::Sharing[:everyone]} | ({sharing_level: Post::Sharing[:friends]} & {user: {followers: current_user} }).joins(:user.outer => :followers.outer}

How to get bean using application context in spring boot

If you are inside of Spring bean (in this case @Controller bean) you shouldn't use Spring context instance at all. Just autowire className bean directly.

BTW, avoid using field injection as it's considered as bad practice.

correct way to use super (argument passing)

As explained in Python's super() considered super, one way is to have class eat the arguments it requires, and pass the rest on. Thus, when the call-chain reaches object, all arguments have been eaten, and object.__init__ will be called without arguments (as it expects). So your code should look like this:

class A(object):
    def __init__(self, *args, **kwargs):
        print "A"
        super(A, self).__init__(*args, **kwargs)

class B(object):
    def __init__(self, *args, **kwargs):
        print "B"
        super(B, self).__init__(*args, **kwargs)

class C(A):
    def __init__(self, arg, *args, **kwargs):
        print "C","arg=",arg
        super(C, self).__init__(*args, **kwargs)

class D(B):
    def __init__(self, arg, *args, **kwargs):
        print "D", "arg=",arg
        super(D, self).__init__(*args, **kwargs)

class E(C,D):
    def __init__(self, arg, *args, **kwargs):
        print "E", "arg=",arg
        super(E, self).__init__(*args, **kwargs)

print "MRO:", [x.__name__ for x in E.__mro__]
E(10, 20, 30)

How do I convert strings between uppercase and lowercase in Java?

Yes. There are methods on the String itself for this.

Note that the result depends on the Locale the JVM is using. Beware, locales is an art in itself.

"Application tried to present modally an active controller"?

I had same problem.I solve it. You can try This code:

[tabBarController setSelectedIndex:1];
[self dismissModalViewControllerAnimated:YES];

How can one run multiple versions of PHP 5.x on a development LAMP server?

Note: The following method will work on windows.

An alternative method (if it is ok to run a single version of PHP at a time) is to define multiple Apache services, each of which will use a different PHP version.

First of all use conditions in the Apache configuration file:

 <ifdefine php54>
    SetEnv PHPRC C:/apache/php54/
    ScriptAlias /php/ "C:/apache/php54/"
    AddType application/x-httpd-php .php
    Action application/x-httpd-php "/php/php-cgi.exe"
</ifdefine>

<ifdefine php55>
    SetEnv PHPRC C:/apache/php55/
    ScriptAlias /php/ "C:/apache/php55/"
    AddType application/x-httpd-php .php
    Action application/x-httpd-php "/php/php-cgi.exe"
</ifdefine>

Now using the httpd.exe create two separate services from command line (elevated to administrator):

httpd.exe -k install -n Apache224_php54 -D php54

httpd.exe -k install -n Apache224_php55 -D php55

Now you can start one of the above services at a time (should shutdown one before starting the other).

If you have previously installed Apache as service you can remove that using below command (replace the service name with the one you have used):

apache -k uninstall -n Apache224

One further note is that I personally use a "notification area icon program" called "Seobiseu" to start and stop services as needed. I have added the two above services to it.

Emulator error: This AVD's configuration is missing a kernel file

I solved this by updating SDK Tools and Platform-tools in the Android SDK Manager to newest version.

$(document).click() not working correctly on iPhone. jquery

Short answer:

<style>
    .clickable-div 
    {
         cursor: pointer;
    }
</style>

Longer answer:

It's important to realize that if you're just using <a> tags everything will work as expected. You can click or drag by mistake on a regular <a> link on an iPhone and everything behaves as the user would expect.

I imagine that you have arbitrary HTML that is not clickable - such as a panel containing text and images that cannot be wrapped with <a>. I found out about this problem when I had such a panel that I wanted to be entirely clickable.

<div class='clickable-div' data-href="http://www.stackoverflow.com">

 ... clickable content here (images/text) ...

</div>

To detect a click anywhere within this div I am using jQuery with a data-href html attribute which is shown above (this attribute is invented by myself and is not a standard jQuery or HTML data attribute.)

$(document).on('click', '.clickable-div', function() {

    document.location = $(this).data('href');

});

This will work on your desktop browser but not iPad no matter how much you click.

You may be tempted to change your event handler from click to click touchstart - and this indeed does trigger the event handler. However if the user wants to drag the page up (to scroll) they'll trigger it too - which is a terrible user experience. [you may have noticed this behavior by sneaky banner ads]

The answer is incredibly simple: Just set the css cursor: pointer.

<style>
    .clickable-div 
    {
         cursor: pointer;
    }
</style>

This had the added benefit for desktop users to indicate the area is clickable with a hand icon.

Thanks to https://stackoverflow.com/a/4910962/16940

Golang read request body

I could use the GetBody from Request package.

Look this comment in source code from request.go in net/http:

GetBody defines an optional func to return a new copy of Body. It is used for client requests when a redirect requires reading the body more than once. Use of GetBody still requires setting Body. For server requests it is unused."

GetBody func() (io.ReadCloser, error)

This way you can get the body request without make it empty.

Sample:

getBody := request.GetBody
copyBody, err := getBody()
if err != nil {
    // Do something return err
}
http.DefaultClient.Do(request)

C# convert int to string with padding zeros?

To pad int i to match the string length of int x, when both can be negative:

i.ToString().PadLeft((int)Math.Log10(Math.Abs(x < 0 ? x * 10 : x)) + 1, '0')

How to use format() on a moment.js duration?

convert duration to ms and then to moment:

moment.utc(duration.as('milliseconds')).format('HH:mm:ss')

mySQL convert varchar to date

select date_format(str_to_date('31/12/2010', '%d/%m/%Y'), '%Y%m');

select date_format(str_to_date('12/31/2011', '%m/%d/%Y'), '%Y%m');

hard to tell from your example

How can I open an Excel file in Python?

Edit:
In the newer version of pandas, you can pass the sheet name as a parameter.

file_name =  # path to file + file name
sheet =  # sheet name or sheet number or list of sheet numbers and names

import pandas as pd
df = pd.read_excel(io=file_name, sheet_name=sheet)
print(df.head(5))  # print first 5 rows of the dataframe

Check the docs for examples on how to pass sheet_name:
https://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_excel.html

Old version:
you can use pandas package as well....

When you are working with an excel file with multiple sheets, you can use:

import pandas as pd
xl = pd.ExcelFile(path + filename)
xl.sheet_names

>>> [u'Sheet1', u'Sheet2', u'Sheet3']

df = xl.parse("Sheet1")
df.head()

df.head() will print first 5 rows of your Excel file

If you're working with an Excel file with a single sheet, you can simply use:

import pandas as pd
df = pd.read_excel(path + filename)
print df.head()

how do I get eclipse to use a different compiler version for Java?

From the menu bar: Project -> Properties -> Java Compiler

Enable project specific settings (checked) Uncheck "use Compliance from execution environment '.... Select the desired "compiler compliance level"

That will allow you to compile "1.5" code using a "1.6" JDK.

If you want to acutally use a 1.5 JDK to produce "1.5" compliant code, then install a suitable 1.5 JDK and tell eclipse where it is installed via:

Window -> preferences -> Installed JREs

And then go back to your project

Project -> properties -> Java Build Path -> libraries

remove the 1.6 system libaries, and: add library... -> JRE System LIbrary -> Alternate JRE -> The JRE you want.

Verify that the correct JRE is on the project's build path, save everything, and enjoy!

Is the size of C "int" 2 bytes or 4 bytes?

Mostly it depends on the platform you are using .It depends from compiler to compiler.Nowadays in most of compilers int is of 4 bytes. If you want to check what your compiler is using you can use sizeof(int).

main()
{
    printf("%d",sizeof(int));
    printf("%d",sizeof(short));
    printf("%d",sizeof(long));
}

The only thing c compiler promise is that size of short must be equal or less than int and size of long must be equal or more than int.So if size of int is 4 ,then size of short may be 2 or 4 but not larger than that.Same is true for long and int. It also says that size of short and long can not be same.

adding multiple entries to a HashMap at once in one statement

    boolean x;
    for (x = false, 
        map.put("One", new Integer(1)), 
        map.put("Two", new Integer(2)),      
        map.put("Three", new Integer(3)); x;);

Ignoring the declaration of x (which is necessary to avoid an "unreachable statement" diagnostic), technically it's only one statement.

Easiest way to toggle 2 classes in jQuery

If your element exposes class A from the start, you can write:

$(element).toggleClass("A B");

This will remove class A and add class B. If you do that again, it will remove class B and reinstate class A.

If you want to match the elements that expose either class, you can use a multiple class selector and write:

$(".A, .B").toggleClass("A B");

Jquery and HTML FormData returns "Uncaught TypeError: Illegal invocation"

My experience:

  var text = $('#myInputField');  
  var myObj = {title: 'Some title', content: text};  
  $.post(myUrl, myObj, callback);

The problem is that I forgot to add .val() to the end of $('#myInputField'); this action makes me waste time trying to figure out what was wrong, causing Illegal Invocation Error, since $('#myInputField') was in a different file than that system pointed out incorrect code. Hope this answer help fellows in the same mistake to avoid to loose time.

Django {% with %} tags within {% if %} {% else %} tags?

if you want to stay DRY, use an include.

{% if foo %}
  {% with a as b %}
    {% include "snipet.html" %}
  {% endwith %} 
{% else %}
  {% with bar as b %}
    {% include "snipet.html" %}
  {% endwith %} 
{% endif %}

or, even better would be to write a method on the model that encapsulates the core logic:

def Patient(models.Model):
    ....
    def get_legally_responsible_party(self):
       if self.age > 18:
          return self
       else:
          return self.parent

Then in the template:

{% with patient.get_legally_responsible_party as p %}
  Do html stuff
{% endwith %}

Then in the future, if the logic for who is legally responsible changes you have a single place to change the logic -- far more DRY than having to change if statements in a dozen templates.

Python Dictionary Comprehension

>>> {i:i for i in range(1, 11)}
{1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9, 10: 10}

SQLSTATE[28000] [1045] Access denied for user 'root'@'localhost' (using password: YES) Symfony2

In your app/config/parameters.yml

# This file is auto-generated during the composer install
parameters:
    database_driver: pdo_mysql
    database_host: 127.0.0.1
    database_port: 3306
    database_name: symfony
    database_user: root
    database_password: "your_password"
    mailer_transport: smtp
    mailer_host: 127.0.0.1
    mailer_user: null
    mailer_password: null
    locale: en
    secret: ThisTokenIsNotSoSecretChangeIt

The value of database_password should be within double or single quotes as in: "your_password" or 'your_password'.

I have seen most of users experiencing this error because they are using password with leading zero or numeric values.

Adding subscribers to a list using Mailchimp's API v3

BATCH LOAD - OK, so after having my previous reply deleted for just using links I have updated with the code I managed to get working. Appreciate anyone to simplify / correct / refine / put in function etc as I'm still learning this stuff, but I got batch member list add working :)

$apikey = "whatever-us99";                            
$list_id = "12ab34dc56";

$email1 = "[email protected]";
$fname1 = "Jack";
$lname1 = "Black";

$email2 = "[email protected]";
$fname2 = "Jill";
$lname2 = "Hill";

$auth = base64_encode( 'user:'.$apikey );

$data1 = array(
    "apikey"        => $apikey,
    "email_address" => $email1,
    "status"        => "subscribed",
    "merge_fields"  => array(                
            'FNAME' => $fname1,
            'LNAME' => $lname1,
    )
);

$data2 = array(
    "apikey"        => $apikey,
    "email_address" => $email2,
    "status"        => "subscribed",                
    "merge_fields"  => array(                
            'FNAME' => $fname2,
            'LNAME' => $lname2,
    )
);

$json_data1 = json_encode($data1);
$json_data2 = json_encode($data2);

$array = array(
    "operations" => array(
        array(
            "method" => "POST",
            "path" => "/lists/$list_id/members/",
            "body" => $json_data1
        ),
        array(
            "method" => "POST",
            "path" => "/lists/$list_id/members/",
            "body" => $json_data2
        )
    )
);

$json_post = json_encode($array);

$ch = curl_init();

$curlopt_url = "https://us99.api.mailchimp.com/3.0/batches";
curl_setopt($ch, CURLOPT_URL, $curlopt_url);

curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json',
'Authorization: Basic '.$auth));
curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/3.0');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $json_post);

print_r($json_post . "\n");
$result = curl_exec($ch);

var_dump($result . "\n");
print_r ($result . "\n");

How to truncate string using SQL server

You can use

LEFT(column, length)

SUBSTRING(column, start index, length)

What's the name for hyphen-separated case?

There is no standardized name.

Libraries like jquery and lodash refer it as kebab-case. So does Vuejs javascript framework. However, I am not sure whether it's safe to declare that it's referred as kebab-case in javascript world.

int *array = new int[n]; what is this function actually doing?

int *array = new int[n];

It declares a pointer to a dynamic array of type int and size n.

A little more detailed answer: new allocates memory of size equal to sizeof(int) * n bytes and return the memory which is stored by the variable array. Also, since the memory is dynamically allocated using new, you've to deallocate it manually by writing (when you don't need anymore, of course):

delete []array;

Otherwise, your program will leak memory of at least sizeof(int) * n bytes (possibly more, depending on the allocation strategy used by the implementation).

How to call a method after bean initialization is complete?

There are three different approaches to consider, as described in the reference

Use init-method attribute

Pros:

Does not require bean to implement an interface.

Cons:

No immediate indication this method is required after construction to ensure the bean is correctly configured.

Implement InitializingBean

Pros:

No need to specify init-method, or turn on component scanning / annotation processing.
Appropriate for beans supplied with a library, where we don't want the application using this library to concern itself with bean lifecycle.

Cons:

More invasive than the init-method approach.

Use JSR-250 @PostConstruct lifecyle annotation

Pros:

Useful when using component scanning to autodetect beans.
Makes it clear that a specific method is to be used for initialisation. Intent is closer to the code.

Cons:

Initialisation no longer centrally specified in configuration.
You must remember to turn on annotation processing (which can sometimes be forgotten)

How to get item's position in a list?

for i in xrange(len(testlist)):
  if testlist[i] == 1:
    print i

xrange instead of range as requested (see comments).

What is parsing in terms that a new programmer would understand?

In linguistics, to divide language into small components that can be analyzed. For example, parsing this sentence would involve dividing it into words and phrases and identifying the type of each component (e.g.,verb, adjective, or noun).

Parsing is a very important part of many computer science disciplines. For example, compilers must parse source code to be able to translate it into object code. Likewise, any application that processes complex commands must be able to parse the commands. This includes virtually all end-user applications.

Parsing is often divided into lexical analysis and semantic parsing. Lexical analysis concentrates on dividing strings into components, called tokens, based on punctuationand other keys. Semantic parsing then attempts to determine the meaning of the string.

http://www.webopedia.com/TERM/P/parse.html

stale element reference: element is not attached to the page document

What is the line which gives exception ??

The reason for this is because the element to which you have referred is removed from the DOM structure

I was facing the same problem while working with IEDriver. The reason was because javascript loaded the element one more time after i have referred so my date reference pointed to an unexisting object even if it was right their on UI. I used the following workaround.

try {
    WebElement date = driver.findElement(By.linkText(Utility.getSheetData(path, 7, 1, 2)));
    date.click();
}
catch(org.openqa.selenium.StaleElementReferenceException ex)
{
    WebElement date = driver.findElement(By.linkText(Utility.getSheetData(path, 7, 1, 2)));
    date.click();
}

See if the same can help you !

In Objective-C, how do I test the object type?

Simple, [yourobject class] it will return the class name of yourobject.

How do I format axis number format to thousands with a comma in matplotlib?

If you like it hacky and short you can also just update the labels

def update_xlabels(ax):
    xlabels = [format(label, ',.0f') for label in ax.get_xticks()]
    ax.set_xticklabels(xlabels)

update_xlabels(ax)
update_xlabels(ax2)

COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better?

I feel the performance characteristics change from one DBMS to another. It's all on how they choose to implement it. Since I have worked extensively on Oracle, I'll tell from that perspective.

COUNT(*) - Fetches entire row into result set before passing on to the count function, count function will aggregate 1 if the row is not null

COUNT(1) - Will not fetch any row, instead count is called with a constant value of 1 for each row in the table when the WHERE matches.

COUNT(PK) - The PK in Oracle is indexed. This means Oracle has to read only the index. Normally one row in the index B+ tree is many times smaller than the actual row. So considering the disk IOPS rate, Oracle can fetch many times more rows from Index with a single block transfer as compared to entire row. This leads to higher throughput of the query.

From this you can see the first count is the slowest and the last count is the fastest in Oracle.

Where does gcc look for C and C++ header files?

`gcc -print-prog-name=cc1plus` -v

This command asks gcc which C++ preprocessor it is using, and then asks that preprocessor where it looks for includes.

You will get a reliable answer for your specific setup.

Likewise, for the C preprocessor:

`gcc -print-prog-name=cpp` -v

When should I use curly braces for ES6 import?

The curly braces are used only for import when export is named. If the export is default then curly braces are not used for import.

How can I create tests in Android Studio?

This answer is for people who are just getting started with Android testing. I will provide two simple examples to help you see how testing works. If you follow along for the next 10 minutes, you will be all set up to start adding your tests to your own app. I think you'll be surprised how easy it is. I certainly was.

Intro to Android Testing

There are two different types of tests that you will do.

Local unit tests. These are run locally on the JVM (Java Virtual Machine). Since they are local, they are fast. You can use them to test the parts of your code that just need Java and not the Android APIs. (Sometimes you can make a fake API object to test more things locally. This is called a mocking. A mock Context is an example.)
Instrumented tests. These tests are run on a real device or in the emulator. That makes them slower than the local tests. However, they are more flexible because you have the full Android API available to you.

Create a new project and you will see the following default folders.

Everything is already there and waiting for you to create your tests. It's all set up already!

How to create local unit tests

Open the ExampleUnitTest file shown in the image above. it should look something like this:

public class ExampleUnitTest {
    @Test
    public void addition_isCorrect() throws Exception {
        assertEquals(4, 2 + 2);
    }
}

Press the double green arrow to run all the tests or the single green arrow to run only one. (In this case there is only one test so they both do the same thing.)

It should pass (as long as 2 + 2 is still 4 when you are reading this answer). Congratulations, you just ran your first test!

Making your own test

Let's write our own test. First add this class to your main app project so that we have something to test:

public class MyClass {
    public int add(int a, int b) {
        return a + b;
    }
}

Now change the addition_isCorrect() method in the test class to be like the following code (or just add another method with a different name):

public class ExampleUnitTest {
    @Test
    public void addition_isCorrect() throws Exception {
        MyClass myClass = new MyClass();
        int result = myClass.add(2, 2);
        int expected = 4;
        assertEquals(expected, result);
    }
}

Run it again and you should see it pass. Congratulations, you just created your own first test! (Well, I guess technically it was mine, but, hey, close enough. What's mine is yours.)

How to create instrumented tests

Open the ExampleInstrumentedTest file. it should look something like this:

@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
    @Test
    public void useAppContext() throws Exception {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getTargetContext();

        assertEquals("com.example.myapp", appContext.getPackageName());
    }
}

Press one of those green buttons again.

As long as you have a real device connected or the emulator set up, it should have started it up and run your app. Congratulations, you just ran your first instrumented test!

Making your own test

The instrumented tests use Espresso to run the tests. It is kind of like your own little robot user that you can have test your app. You can tell it to do something like pressing a button or reading the properties of a TextView.

You can write the instructions for how to do the test by hand, but since we are just starting out, let's use the auto-record function. It's super simple.

First add a button to your UI so that we have something to work with. I did this:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.myapp.MainActivity">

    <Button
        android:id="@+id/myButton"
        android:text="Click me"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</android.support.constraint.ConstraintLayout>

Then press Run > Record Espresso Test in the menu.

After it starts, click the button in the emulator and then to finish choose OK on the Record dialog. It should auto generate the following test code.

@LargeTest
@RunWith(AndroidJUnit4.class)
public class MainActivityTest {

    @Rule
    public ActivityTestRule<MainActivity> mActivityTestRule = new ActivityTestRule<>(MainActivity.class);

    @Test
    public void mainActivityTest() {
        ViewInteraction appCompatButton = onView(
                allOf(withId(R.id.myButton), withText("Click me"), isDisplayed()));
        appCompatButton.perform(click());
    }
}

Great! You just created you first instrumented test! That was super easy. You should probably add an assertion to make it a real test, but that that is pretty easy to do with the recorder, too. Watch this video to go a little deeper.

Further Study

I'd watch the videos first and then read through the documentation. It is all pretty helpful. The last link is to a series of articles that cover some important things to think about when choosing what to test.

Android Testing Patterns (short video series from Android Developers)
Getting Started with Testing (Android docs)
Three Steps to Code Quality via TDD

How to replace master branch in Git, entirely, from another branch?

I found this to be the best way of doing this (I had an issue with my server not letting me delete).

On the server that hosts the origin repository, type the following from a directory inside the repository:

git config receive.denyDeleteCurrent ignore

On your workstation:

git branch -m master vabandoned                 # Rename master on local
git branch -m newBranch master                  # Locally rename branch newBranch to master
git push origin :master                         # Delete the remote's master
git push origin master:refs/heads/master        # Push the new master to the remote
git push origin abandoned:refs/heads/abandoned  # Push the old master to the remote

Back on the server that hosts the origin repository:

git config receive.denyDeleteCurrent true

Credit to the author of blog post http://www.mslinn.com/blog/?p=772

Excel VBA: AutoFill Multiple Cells with Formulas

Based on my Comment here is one way to get what you want done:

Start byt selecting any cell in your range and Press Ctrl + T

This will give you this pop up:

enter image description here

make sure the Where is your table text is correct and click ok you will now have:

enter image description here

Now If you add a column header in D it will automatically be added to the table all the way to the last row:

enter image description here

Now If you enter a formula into this column:

enter image description here

After you enter it, the formula will be auto filled all the way to last row:

enter image description here

Now if you add a new row at the next row under your table:

enter image description here

Once entered it will be resized to the width of your table and all columns with formulas will be added also:

enter image description here

Hope this solves your problem!

How to remove time portion of date in C# in DateTime object only?

None of the above answers solved my problem on winforms.

the easiest way to reach ONLY date is the simple function in Datetime:

DateTime dt = DateTime.now;
String BirthDate = dt.ToShortDateString();

You will only have date in Birthday string .

What's the best practice to round a float to 2 decimals?

I've tried to support the -ve values for @Ivan Stin excellent 2nd method. (Major credit goes to @Ivan Stin for his method)

public static float round(float value, int scale) {
    int pow = 10;
    for (int i = 1; i < scale; i++) {
        pow *= 10;
    }
    float tmp = value * pow;
    float tmpSub = tmp - (int) tmp;

    return ( (float) ( (int) (
            value >= 0
            ? (tmpSub >= 0.5f ? tmp + 1 : tmp)
            : (tmpSub >= -0.5f ? tmp : tmp - 1)
            ) ) ) / pow;

    // Below will only handles +ve values
    // return ( (float) ( (int) ((tmp - (int) tmp) >= 0.5f ? tmp + 1 : tmp) ) ) / pow;
}

Below are the tests cases I've tried. Please let me know if this is not addressing any other cases.

@Test
public void testFloatRound() {
    // +ve values
    Assert.assertEquals(0F, NumberUtils.round(0F), 0);
    Assert.assertEquals(1F, NumberUtils.round(1F), 0);
    Assert.assertEquals(23.46F, NumberUtils.round(23.4567F), 0);
    Assert.assertEquals(23.45F, NumberUtils.round(23.4547F), 0D);
    Assert.assertEquals(1.00F, NumberUtils.round(0.49999999999999994F + 0.5F), 0);
    Assert.assertEquals(123.12F, NumberUtils.round(123.123F), 0);
    Assert.assertEquals(0.12F, NumberUtils.round(0.123F), 0);
    Assert.assertEquals(0.55F, NumberUtils.round(0.55F), 0);
    Assert.assertEquals(0.55F, NumberUtils.round(0.554F), 0);
    Assert.assertEquals(0.56F, NumberUtils.round(0.556F), 0);
    Assert.assertEquals(123.13F, NumberUtils.round(123.126F), 0);
    Assert.assertEquals(123.15F, NumberUtils.round(123.15F), 0);
    Assert.assertEquals(123.17F, NumberUtils.round(123.1666F), 0);
    Assert.assertEquals(123.46F, NumberUtils.round(123.4567F), 0);
    Assert.assertEquals(123.87F, NumberUtils.round(123.8711F), 0);
    Assert.assertEquals(123.15F, NumberUtils.round(123.15123F), 0);
    Assert.assertEquals(123.89F, NumberUtils.round(123.8909F), 0);
    Assert.assertEquals(124.00F, NumberUtils.round(123.9999F), 0);
    Assert.assertEquals(123.70F, NumberUtils.round(123.7F), 0);
    Assert.assertEquals(123.56F, NumberUtils.round(123.555F), 0);
    Assert.assertEquals(123.00F, NumberUtils.round(123.00F), 0);
    Assert.assertEquals(123.50F, NumberUtils.round(123.50F), 0);
    Assert.assertEquals(123.93F, NumberUtils.round(123.93F), 0);
    Assert.assertEquals(123.93F, NumberUtils.round(123.9312F), 0);
    Assert.assertEquals(123.94F, NumberUtils.round(123.9351F), 0);
    Assert.assertEquals(123.94F, NumberUtils.round(123.9350F), 0);
    Assert.assertEquals(123.94F, NumberUtils.round(123.93501F), 0);
    Assert.assertEquals(99.99F, NumberUtils.round(99.99F), 0);
    Assert.assertEquals(100.00F, NumberUtils.round(99.999F), 0);
    Assert.assertEquals(100.00F, NumberUtils.round(99.9999F), 0);

    // -ve values
    Assert.assertEquals(-123.94F, NumberUtils.round(-123.93501F), 0);
    Assert.assertEquals(-123.00F, NumberUtils.round(-123.001F), 0);
    Assert.assertEquals(-0.94F, NumberUtils.round(-0.93501F), 0);
    Assert.assertEquals(-1F, NumberUtils.round(-1F), 0);
    Assert.assertEquals(-0.50F, NumberUtils.round(-0.50F), 0);
    Assert.assertEquals(-0.55F, NumberUtils.round(-0.55F), 0);
    Assert.assertEquals(-0.55F, NumberUtils.round(-0.554F), 0);
    Assert.assertEquals(-0.56F, NumberUtils.round(-0.556F), 0);
    Assert.assertEquals(-0.12F, NumberUtils.round(-0.1234F), 0);
    Assert.assertEquals(-0.12F, NumberUtils.round(-0.123456789F), 0);
    Assert.assertEquals(-0.13F, NumberUtils.round(-0.129F), 0);
    Assert.assertEquals(-99.99F, NumberUtils.round(-99.99F), 0);
    Assert.assertEquals(-100.00F, NumberUtils.round(-99.999F), 0);
    Assert.assertEquals(-100.00F, NumberUtils.round(-99.9999F), 0);
}

Simplest/cleanest way to implement a singleton in JavaScript

You can return the same instance in every new execution -

function Singleton() {
    // lazy 
    if (Singleton.prototype.myInstance == undefined) {
        Singleton.prototype.myInstance = { description: "I am the instance"};
    }
    return Singleton.prototype.myInstance;
}

a = new Singleton();
b = new Singleton();
console.log(a); // { description: "I am the instance"};
console.log(b); // { description: "I am the instance"};
console.log(a==b); // true

What are database constraints?

Constraints are part of a database schema definition.

A constraint is usually associated with a table and is created with a CREATE CONSTRAINT or CREATE ASSERTION SQL statement.

They define certain properties that data in a database must comply with. They can apply to a column, a whole table, more than one table or an entire schema. A reliable database system ensures that constraints hold at all times (except possibly inside a transaction, for so called deferred constraints).

Common kinds of constraints are:

not null - each value in a column must not be NULL
unique - value(s) in specified column(s) must be unique for each row in a table
primary key - value(s) in specified column(s) must be unique for each row in a table and not be NULL; normally each table in a database should have a primary key - it is used to identify individual records
foreign key - value(s) in specified column(s) must reference an existing record in another table (via it's primary key or some other unique constraint)
check - an expression is specified, which must evaluate to true for constraint to be satisfied

Display List in a View MVC

Your action method considers model type asList<string>. But, in your view you are waiting for IEnumerable<Standings.Models.Teams>. You can solve this problem with changing the model in your view to List<string>.

But, the best approach would be to return IEnumerable<Standings.Models.Teams> as a model from your action method. Then you haven't to change model type in your view.

But, in my opinion your models are not correctly implemented. I suggest you to change it as:

public class Team
{
    public int Position { get; set; }
    public string HomeGround {get; set;}
    public string NickName {get; set;}
    public int Founded { get; set; }
    public string Name { get; set; }
}

Then you must change your action method as:

public ActionResult Index()
{
    var model = new List<Team>();

    model.Add(new Team { Name = "MU"});
    model.Add(new Team { Name = "Chelsea"});
    ...

    return View(model);
}

And, your view:

@model IEnumerable<Standings.Models.Team>

@{
     ViewBag.Title = "Standings";
}

@foreach (var item in Model)
{
    <div>
        @item.Name
        <hr />
    </div>
}

Changing date format in R

This is really easy using package lubridate. All you have to do is tell R what format your date is already in. It then converts it into the standard format

nzd$date <- dmy(nzd$date)

that's it.

Auto code completion on Eclipse

Use the Ctrl+Space shortcut for getting all possible autocomplete options available in a particular context in the editor.

Auto Complete will also allow you to insert custom code templates into the editor, with placeholders for various inputs. For instance, attempting to auto complete the word "test" in a Java editor, in the context of a class body, will allow you to create a unit test that uses JUnit; you'll have to code the body of the method though. Some code templates like the former, come out of the box.

Configuration options of interest

Auto-activation delay. If the list of auto complete options is taking too long to appear, the delay can be reduced from Windows -> Preferences -> Java -> Editor -> Content Assist -> Auto Activation delay (specify the reduced delay here).
Auto activation trigger for Java. Accessible in the same pane, this happens to be the . character by default. When you have just keyed in typeA. and you expect to see relevant members that can be accessed, the auto completion list will automatically popup with the appropriate members, on this trigger.
Proposal types. If you do not want to see proposals of a particular variety, you can disable them from Windows -> Preferences -> Java -> Editor -> Content Assist -> Advanced. I typically switch off proposals of most kinds except Java and Template proposals. Hitting Ctrl+Space multiple times will cycle you through proposals of various kinds.
Template Proposals. These are different from your run of the mill proposals. You could add your code templates in here; it can be accessed from Windows -> Preferences -> Java -> Editor -> Templates. Configuration of existing templates is allowed and so is addition of new ones. Reserve usage however for the tedious typing tasks that do not have a template yet.

jQuery - select the associated label element of a input field

You shouldn't rely on the order of elements by using prev or next. Just use the for attribute of the label, as it should correspond to the ID of the element you're currently manipulating:

var label = $("label[for='" + $(this).attr('id') + "']");

However, there are some cases where the label will not have for set, in which case the label will be the parent of its associated control. To find it in both cases, you can use a variation of the following:

var label = $('label[for="' + $(this).attr('id') + '"]');

if(label.length <= 0) {
    var parentElem = $(this).parent(),
        parentTagName = parentElem.get(0).tagName.toLowerCase();

    if(parentTagName == "label") {
        label = parentElem;
    }
}

I hope this helps!

Manually map column names with class properties

Note that Dapper object mapping isn't case sensitive, so you can name your properties like this:

public class Person 
{
    public int Person_Id { get; set; }
    public string First_Name { get; set; }
    public string Last_Name { get; set; }
}

Or keep the Person class and use a PersonMap:

  public class PersonMap 
        {
            public int Person_Id { get; set; }
            public string First_Name { get; set; }
            public string Last_Name { get; set; }
            public Person Map(){
              return new Person{
                PersonId = Person_Id,
                FirstName = First_Name,
                LastName = Last_Name
               }               
            }
        }

And then, in the query result:

var person = conn.Query<PersonMap>(sql).Select(x=>x.Map()).ToList();

Chrome & Safari Error::Not allowed to load local resource: file:///D:/CSS/Style.css

The solution is already answered here above (long ago).

But the implicit question "why does it work in FF and IE but not in Chrome and Safari" is found in the error text "Not allowed to load local resource": Chrome and Safari seem to use a more strict implementation of sandboxing (for security reasons) than the other two (at this time 2011).

This applies for local access. In a (normal) server environment (apache ...) the file would simply not have been found.

How to determine the encoding of text?

If you know the some content of the file you can try to decode it with several encoding and see which is missing. In general there is no way since a text file is a text file and those are stupid ;)

How to convert CSV file to multiline JSON?

You can use Pandas DataFrame to achieve this, with the following Example:

import pandas as pd
csv_file = pd.DataFrame(pd.read_csv("path/to/file.csv", sep = ",", header = 0, index_col = False))
csv_file.to_json("/path/to/new/file.json", orient = "records", date_format = "epoch", double_precision = 10, force_ascii = True, date_unit = "ms", default_handler = None)

Bash Templating: How to build configuration files from templates with Bash?

To follow up on plockc's answer on this page, here is a dash-suitable version, for those of you looking to avoid bashisms.

eval "cat <<EOF >outputfile
$( cat template.in )
EOF
" 2> /dev/null

release Selenium chromedriver.exe from memory

You should apply close before than quit

driver.close()
driver.quit()

Importing class from another file

Your problem is basically that you never specified the right path to the file.

Try instead, from your main script:

from folder.file import Klasa

Or, with from folder import file:

from folder import file
k = file.Klasa()

Or again:

import folder.file as myModule
k = myModule.Klasa()

How can I convert comma separated string into a List<int>

TimeStamp on file name using PowerShell

You can insert arbitrary PowerShell script code in a double-quoted string by using a subexpression, for example, $() like so:

"C:\temp\mybackup $(get-date -f yyyy-MM-dd).zip"

And if you are getting the path from somewhere else - already as a string:

$dirName  = [io.path]::GetDirectoryName($path)
$filename = [io.path]::GetFileNameWithoutExtension($path)
$ext      = [io.path]::GetExtension($path)
$newPath  = "$dirName\$filename $(get-date -f yyyy-MM-dd)$ext"

And if the path happens to be coming from the output of Get-ChildItem:

Get-ChildItem *.zip | Foreach {
  "$($_.DirectoryName)\$($_.BaseName) $(get-date -f yyyy-MM-dd)$($_.extension)"}

Hibernate Query By Example and Projections

Can I see your User class? This is just using restrictions below. I don't see why Restrictions would be really any different than Examples (I think null fields get ignored by default in examples though).

getCurrentSession().createCriteria(User.class)
.setProjection( Projections.distinct( Projections.projectionList()
.add( Projections.property("name"), "name")
.add( Projections.property("city"), "city")))
.add( Restrictions.eq("city", "TEST")))
.setResultTransformer(Transformers.aliasToBean(User.class))
.list();

I've never used the alaistToBean, but I just read about it. You could also just loop over the results..

List<Object> rows = criteria.list();
for(Object r: rows){
  Object[] row = (Object[]) r;
  Type t = ((<Type>) row[0]);
}

If you have to you can manually populate User yourself that way.

Its sort of hard to look into the issue without some more information to diagnose the issue.

What is the purpose of meshgrid in Python / NumPy?

Courtesy of Microsoft Excel:

Check if string contains a value in array

  $search = "web"
    $owned_urls = array('website1.com', 'website2.com', 'website3.com');
          foreach ($owned_urls as $key => $value) {
         if (stristr($value, $search) == '') {
        //not fount
        }else{
      //found
       }

this is the best approach search for any substring , case-insensitive and fast

just like like im mysql

ex:

select * from table where name = "%web%"

Implementing a simple file download servlet

Assuming you have access to servlet as below

http://localhost:8080/myapp/download?id=7

I need to create a servlet and register it to web.xml

web.xml

<servlet>
     <servlet-name>DownloadServlet</servlet-name>
     <servlet-class>com.myapp.servlet.DownloadServlet</servlet-class>
</servlet>
<servlet-mapping>
     <servlet-name>DownloadServlet</servlet-name>
     <url-pattern>/download</url-pattern>
</servlet-mapping>

DownloadServlet.java

public class DownloadServlet extends HttpServlet {


    protected void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         String id = request.getParameter("id");

         String fileName = "";
         String fileType = "";
         // Find this file id in database to get file name, and file type

         // You must tell the browser the file type you are going to send
         // for example application/pdf, text/plain, text/html, image/jpg
         response.setContentType(fileType);

         // Make sure to show the download dialog
         response.setHeader("Content-disposition","attachment; filename=yourcustomfilename.pdf");

         // Assume file name is retrieved from database
         // For example D:\\file\\test.pdf

         File my_file = new File(fileName);

         // This should send the file to browser
         OutputStream out = response.getOutputStream();
         FileInputStream in = new FileInputStream(my_file);
         byte[] buffer = new byte[4096];
         int length;
         while ((length = in.read(buffer)) > 0){
            out.write(buffer, 0, length);
         }
         in.close();
         out.flush();
    }
}

How to give Jenkins more heap space when it´s started as a service under Windows?

In your Jenkins installation directory there is a jenkins.xml, where you can set various options. Add the parameter -Xmx with the size you want to the arguments-tag (or increase the size if its already there).

Ukkonen's suffix tree algorithm in plain English

How do I make a C++ macro behave like a function?

I know you said "ignore what the macro does", but people will find this question by searching based on the title, so I think discussion of further techniques to emulate functions with macros are warranted.

Closest I know of is:

#define MACRO(X,Y) \
do { \
    auto MACRO_tmp_1 = (X); \
    auto MACRO_tmp_2 = (Y); \
    using std::cout; \
    using std::endl; \
    cout << "1st arg is:" << (MACRO_tmp_1) << endl;    \
    cout << "2nd arg is:" << (MACRO_tmp_2) << endl;    \
    cout << "Sum is:" << (MACRO_tmp_1 + MACRO_tmp_2) << endl; \
} while(0)

This does the following:

Works correctly in each of the stated contexts.
Evaluates each of its arguments exactly once, which is a guaranteed feature of a function call (assuming in both cases no exceptions in any of those expressions).
Acts on any types, by use of "auto" from C++0x. This is not yet standard C++, but there's no other way to get the tmp variables necessitated by the single-evaluation rule.
Doesn't require the caller to have imported names from namespace std, which the original macro does, but a function would not.

However, it still differs from a function in that:

In some invalid uses it may give different compiler errors or warnings.
It goes wrong if X or Y contain uses of 'MACRO_tmp_1' or 'MACRO_tmp_2' from the surrounding scope.
Related to the namespace std thing: a function uses its own lexical context to look up names, whereas a macro uses the context of its call site. There's no way to write a macro that behaves like a function in this respect.
It can't be used as the return expression of a void function, which a void expression (such as the comma solution) can. This is even more of an issue when the desired return type is not void, especially when used as an lvalue. But the comma solution can't include using declarations, because they're statements, so pick one or use the ({ ... }) GNU extension.

Why is "1000000000000000 in range(1000000000000001)" so fast in Python 3?

Try x-1 in (i for i in range(x)) for large x values, which uses a generator comprehension to avoid invoking the range.__contains__ optimisation.

Add Foreign Key to existing table

How to fix Error Code: 1005. Can't create table 'mytable.#sql-7fb1_7d3a' (errno: 150) in mysql.

alter your table and add an index to it..

ALTER TABLE users ADD INDEX index_name (index_column)

Now add the constraint

ALTER TABLE foreign_key_table
ADD CONSTRAINT foreign_key_name FOREIGN KEY (foreign_key_column)
REFERENCES primary_key_table (primary_key_column) ON DELETE NO ACTION
ON UPDATE CASCADE;

Note if you don't add an index it wont work.

After battling with it for about 6 hours I came up with the solution I hope this save a soul.

List of Timezone IDs for use with FindTimeZoneById() in C#?

You will find complete list of time zone with its GMToffsets here and you can use "Name of Time Zone" column value to find time zone by ID

e.g

TimeZoneInfo objTimeZoneInfo = TimeZoneInfo.FindTimeZoneById("Dateline Standard Time");

You will get time zone info class that contains dateline standard time time zone which is used for GMT-12:00.

Why XML-Serializable class need a parameterless constructor

During an object's de-serialization, the class responsible for de-serializing an object creates an instance of the serialized class and then proceeds to populate the serialized fields and properties only after acquiring an instance to populate.

You can make your constructor private or internal if you want, just so long as it's parameterless.

How to get summary statistics by group

take a look at the plyr package. Specifically, ddply

ddply(df, .(group), summarise, mean=mean(dt), sum=sum(dt))

Unfamiliar symbol in algorithm: what does ? mean?

Can be read, "For all s such that s does not equal s[start]"

how to resolve DTS_E_OLEDBERROR. in ssis

I had a similar issue with my OLE DB Command and I resolved it by setting the ValidateExternalMetadata property within the component to False.

Apache shutdown unexpectedly

That is because IIS is automatically running on your machine. IIS occupied both port 80 and 443.

I uninstalled IIS for using Apache httpd.

CASCADE DELETE just once

If I understand correctly, you should be able to do what you want by dropping the foreign key constraint, adding a new one (which will cascade), doing your stuff, and recreating the restricting foreign key constraint.

For example:

testing=# create table a (id integer primary key);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "a_pkey" for table "a"
CREATE TABLE
testing=# create table b (id integer references a);
CREATE TABLE

-- put some data in the table
testing=# insert into a values(1);
INSERT 0 1
testing=# insert into a values(2);
INSERT 0 1
testing=# insert into b values(2);
INSERT 0 1
testing=# insert into b values(1);
INSERT 0 1

-- restricting works
testing=# delete from a where id=1;
ERROR:  update or delete on table "a" violates foreign key constraint "b_id_fkey" on table "b"
DETAIL:  Key (id)=(1) is still referenced from table "b".

-- find the name of the constraint
testing=# \d b;
       Table "public.b"
 Column |  Type   | Modifiers 
--------+---------+-----------
 id     | integer | 
Foreign-key constraints:
    "b_id_fkey" FOREIGN KEY (id) REFERENCES a(id)

-- drop the constraint
testing=# alter table b drop constraint b_a_id_fkey;
ALTER TABLE

-- create a cascading one
testing=# alter table b add FOREIGN KEY (id) references a(id) on delete cascade; 
ALTER TABLE

testing=# delete from a where id=1;
DELETE 1
testing=# select * from a;
 id 
----
  2
(1 row)

testing=# select * from b;
 id 
----
  2
(1 row)

-- it works, do your stuff.
-- [stuff]

-- recreate the previous state
testing=# \d b;
       Table "public.b"
 Column |  Type   | Modifiers 
--------+---------+-----------
 id     | integer | 
Foreign-key constraints:
    "b_id_fkey" FOREIGN KEY (id) REFERENCES a(id) ON DELETE CASCADE

testing=# alter table b drop constraint b_id_fkey;
ALTER TABLE
testing=# alter table b add FOREIGN KEY (id) references a(id) on delete restrict; 
ALTER TABLE

Of course, you should abstract stuff like that into a procedure, for the sake of your mental health.

Transfer data from one HTML file to another

The old fashioned way of setting a global variable that persist between pages is to set the data in a Cookie. The modern way is to use Local Storage, which has a good browser support (IE8+, Firefox 3.5+, Chrome 4+, Android 2+, iPhone 2+). Using localStorage is as easy as using an array:

localStorage["key"] = value;

... in another page ...
value = localStorage["key"];

You can also attach event handlers to listen for changes, though the event API is slightly different between browsers. More on the topic.

Keep the order of the JSON keys during JSON conversion to CSV

patchFor(answer @gary) :

$ git diff JSONObject.java                                                         
diff --git a/JSONObject.java b/JSONObject.java
index e28c9cd..e12b7a0 100755
--- a/JSONObject.java
+++ b/JSONObject.java
@@ -32,7 +32,7 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.Collection;
 import java.util.Enumeration;
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Iterator;
 import java.util.Locale;
 import java.util.Map;
@@ -152,7 +152,9 @@ public class JSONObject {
      * Construct an empty JSONObject.
      */
     public JSONObject() {
-        this.map = new HashMap<String, Object>();
+//      this.map = new HashMap<String, Object>();
+        // I want to keep order of the given data:
+        this.map = new LinkedHashMap<String, Object>();
     }

     /**
@@ -243,7 +245,7 @@ public class JSONObject {
      * @throws JSONException
      */
     public JSONObject(Map<String, Object> map) {
-        this.map = new HashMap<String, Object>();
+        this.map = new LinkedHashMap<String, Object>();
         if (map != null) {
             Iterator<Entry<String, Object>> i = map.entrySet().iterator();
             while (i.hasNext()) {

How to put more than 1000 values into an Oracle IN clause

Put the values in a temporary table and then do a select where id in (select id from temptable)

How do I clone a generic list in C#?

If you only care about value types...

And you know the type:

List<int> newList = new List<int>(oldList);

If you don't know the type before, you'll need a helper function:

List<T> Clone<T>(IEnumerable<T> oldList)
{
    return newList = new List<T>(oldList);
}

The just:

List<string> myNewList = Clone(myOldList);

What is the difference between 'typedef' and 'using' in C++11?

The using syntax has an advantage when used within templates. If you need the type abstraction, but also need to keep template parameter to be possible to be specified in future. You should write something like this.

template <typename T> struct whatever {};

template <typename T> struct rebind
{
  typedef whatever<T> type; // to make it possible to substitue the whatever in future.
};

rebind<int>::type variable;

template <typename U> struct bar { typename rebind<U>::type _var_member; }

But using syntax simplifies this use case.

template <typename T> using my_type = whatever<T>;

my_type<int> variable;
template <typename U> struct baz { my_type<U> _var_member; }

Error: Module not specified (IntelliJ IDEA)

For IntelliJ IDEA 2019.3.4 (Ultimate Edition), the following worked for me:

Find the Environment variables for your project.
Specify, from the dropdowns, the values of "Use class path of module:" and "JRE" as in the attached screenshot.

Multiple Image Upload PHP form with one input

extract($_POST);
$error=array();
$extension=array("jpeg","jpg","png","gif");
foreach($_FILES["files"]["tmp_name"] as $key=>$tmp_name) {
    $file_name=$_FILES["files"]["name"][$key];
    $file_tmp=$_FILES["files"]["tmp_name"][$key];
    $ext=pathinfo($file_name,PATHINFO_EXTENSION);

    if(in_array($ext,$extension)) {
        if(!file_exists("photo_gallery/".$txtGalleryName."/".$file_name)) {
            move_uploaded_file($file_tmp=$_FILES["files"]["tmp_name"][$key],"photo_gallery/".$txtGalleryName."/".$file_name);
        }
        else {
            $filename=basename($file_name,$ext);
            $newFileName=$filename.time().".".$ext;
            move_uploaded_file($file_tmp=$_FILES["files"]["tmp_name"][$key],"photo_gallery/".$txtGalleryName."/".$newFileName);
        }
    }
    else {
        array_push($error,"$file_name, ");
    }
}

and you must check your HTML code

<form action="create_photo_gallery.php" method="post" enctype="multipart/form-data">
    <table width="100%">
        <tr>
            <td>Select Photo (one or multiple):</td>
            <td><input type="file" name="files[]" multiple/></td>
        </tr>
        <tr>
            <td colspan="2" align="center">Note: Supported image format: .jpeg, .jpg, .png, .gif</td>
        </tr>
        <tr>
            <td colspan="2" align="center"><input type="submit" value="Create Gallery" id="selectedButton"/></td>
        </tr>
    </table>
</form>

How do I check to see if my array includes an object?

Array's include?method accepts any object, not just a string. This should work:

@suggested_horses = [] 
@suggested_horses << Horse.first(:offset => rand(Horse.count)) 
while @suggested_horses.length < 8 
  horse = Horse.first(:offset => rand(Horse.count)) 
  @suggested_horses << horse unless @suggested_horses.include?(horse)
end

Array#include? documentation

Rename specific column(s) in pandas

A much faster implementation would be to use list-comprehension if you need to rename a single column.

df.columns = ['log(gdp)' if x=='gdp' else x for x in df.columns]

If the need arises to rename multiple columns, either use conditional expressions like:

df.columns = ['log(gdp)' if x=='gdp' else 'cap_mod' if x=='cap' else x for x in df.columns]

Or, construct a mapping using a dictionary and perform the list-comprehension with it's get operation by setting default value as the old name:

col_dict = {'gdp': 'log(gdp)', 'cap': 'cap_mod'}   ## key?old name, value?new name

df.columns = [col_dict.get(x, x) for x in df.columns]

Timings:

%%timeit
df.rename(columns={'gdp':'log(gdp)'}, inplace=True)
10000 loops, best of 3: 168 µs per loop

%%timeit
df.columns = ['log(gdp)' if x=='gdp' else x for x in df.columns]
10000 loops, best of 3: 58.5 µs per loop

Change Select List Option background colour on hover in html

No, it's not possible.

It's really, if not use native selects, if you create custom select widget from html elements, t.e. "li".

Powershell: A positional parameter cannot be found that accepts argument "xxx"

In my case it was the distinction between –(En dash) and -(Hyphen) as in:

Add-Type –Path "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"

and:

Add-Type -Path "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"

Dashes, Hyphens, and Minus signs oh my!

WCF gives an unsecured or incorrectly secured fault error

Although your problem was solved with one of the above solutions, for the benefit of others, here's another option.

You also can get this exception when incorrect credentials are passed to a basic endpoint (SOAP 1.1) that uses username message credentials as you are. For example, if you are calling the service from code and do something like this:

var service = new TestService();

service.ClientCredentials.UserName.UserName = "InvalidUser";
service.ClientCredentials.UserName.Password = "InvalidPass";

This is different from a WSHTTP endpoint (SOAP 1.2) that throws an AccessDeniedException when invalid credentials are passed through. I personally find the message contained herein a little misleading (it certainly cost me a few minutes the first time I encountered it for this reason) but the underlying cause was clear once I consulted the WCF Diagnostic Trace Logs.

How do you use variables in a simple PostgreSQL script?

DO $$
DECLARE  
   a integer := 10;  
   b integer := 20;  
   c integer;  
BEGIN  
   c := a + b;
    RAISE NOTICE'Value of c: %', c;
END $$;

Is it possible to change a UIButtons background color?

This isn't as elegant as sub-classing UIButton, however if you just want something quick - what I did was create custom button, then a 1px by 1px image with the colour I'd want the button to be, and set the background of the button to that image for the highlighted state - works for my needs.

Find all paths between two graph nodes

Finding all possible paths is a hard problem, since there are exponential number of simple paths. Even finding the kth shortest path [or longest path] are NP-Hard.

One possible solution to find all paths [or all paths up to a certain length] from s to t is BFS, without keeping a visited set, or for the weighted version - you might want to use uniform cost search

Note that also in every graph which has cycles [it is not a DAG] there might be infinite number of paths between s to t.

Remove all html tags from php string

use this regex: /<[^<]+?>/g

$val = preg_replace('/<[^<]+?>/g', ' ', $row_get_Business['business_description']);

$businessDesc = substr(val,0,110);

from your example should stay: Ref no: 30001

UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in range(128)

This will work:

 >>>print(unicodedata.normalize('NFD', re.sub("[\(\[].*?[\)\]]", "", "bats\xc3\xa0")).encode('ascii', 'ignore'))

Output:

>>>bats

Regular expression for not allowing spaces in the input field

This will help to find the spaces in the beginning, middle and ending:

var regexp = /\s/g

How to scroll to an element?

Using findDOMNode is going to be deprecated eventually.

The preferred method is to use callback refs.

github eslint

Call an activity method from a fragment

From fragment to activty:

((YourActivityClassName)getActivity()).yourPublicMethod();

From activity to fragment:

FragmentManager fm = getSupportFragmentManager();

//if you added fragment via layout xml
YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentById(R.id.your_fragment_id);
fragment.yourPublicMethod();

If you added fragment via code and used a tag string when you added your fragment, use findFragmentByTag instead:

YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentByTag("yourTag");

Java Convert GMT/UTC to Local time doesn't work as expected

I strongly recommend using Joda Time http://joda-time.sourceforge.net/faq.html

How to download dependencies in gradle

This version builds on Robert Elliot's, but I'm not 100% sure of its efficacy.

// There are a few dependencies added by one of the Scala plugins that this cannot reach.
task downloadDependencies {
  description "Pre-downloads *most* dependencies"
  doLast {
    configurations.getAsMap().each { name, config ->
      println "Retrieving dependencies for $name"
      try {
        config.files
      } catch (e) {
        project.logger.info e.message // some cannot be resolved, silentlyish skip them
      }
    }
  }
}

I tried putting it into configuration instead of action (by removing doLast) and it broke zinc. I worked around it, but the end result was the same with or without. So, I left it as an explicit state. It seems to work enough to reduce the dependencies that have to be downloaded later, but not eliminate them in my case. I think one of the Scala plugins adds dependencies later.

How to read specific lines from a file (by line number)?

If you want to read specific lines, such as line starting after some threshold line then you can use the following codes, file = open("files.txt","r") lines = file.readlines() ## convert to list of lines datas = lines[11:] ## raed the specific lines

Python Dictionary contains List as Value - How to update?

for i,j in dictionary .items():
    if i=='C1':
        c=[]
        for k in j:
            j=k+10
            c.append(j)
            dictionary .update({i:c})

How to find the Center Coordinate of Rectangle?

We can calculate using mid point of line formula,

centre (x,y) =  new Point((boundRect.tl().x+boundRect.br().x)/2,(boundRect.tl().y+boundRect.br().y)/2)

How to recursively list all the files in a directory in C#?

In .NET 4.5, at least, there's this version that is much shorter and has the added bonus of evaluating any file criteria for inclusion in the list:

public static IEnumerable<string> GetAllFiles(string path, 
                                              Func<FileInfo, bool> checkFile = null)
{
    string mask = Path.GetFileName(path);
    if (string.IsNullOrEmpty(mask)) mask = "*.*";
    path = Path.GetDirectoryName(path);
    string[] files = Directory.GetFiles(path, mask, SearchOption.AllDirectories);

    foreach (string file in files)
    {
        if (checkFile == null || checkFile(new FileInfo(file)))
            yield return file;
    }
}

Use like this:

var list = GetAllFiles(mask, (info) => Path.GetExtension(info.Name) == ".html").ToList();

How to count down in for loop?

First I recommand you can try use print and observe the action:

for i in range(0, 5, 1):
    print i

the result:

You can understand the function principle. In fact, range scan range is from 0 to 5-1. It equals 0 <= i < 5

When you really understand for-loop in python, I think its time we get back to business. Let's focus your problem.

You want to use a DECREMENT for-loop in python. I suggest a for-loop tutorial for example.

for i in range(5, 0, -1):
    print i

the result:

Thus it can be seen, it equals 5 >= i > 0

You want to implement your java code in python:

for (int index = last-1; index >= posn; index--)

It should code this:

for i in range(last-1, posn-1, -1)

Difference between InvariantCulture and Ordinal string comparison

InvariantCulture

Uses a "standard" set of character orderings (a,b,c, ... etc.). This is in contrast to some specific locales, which may sort characters in different orders ('a-with-acute' may be before or after 'a', depending on the locale, and so on).

Ordinal

On the other hand, looks purely at the values of the raw byte(s) that represent the character.

There's a great sample at http://msdn.microsoft.com/en-us/library/e6883c06.aspx that shows the results of the various StringComparison values. All the way at the end, it shows (excerpted):

StringComparison.InvariantCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.Ordinal:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is greater than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

You can see that where InvariantCulture yields (U+0069, U+0049, U+00131), Ordinal yields (U+0049, U+0069, U+00131).

Efficiently sorting a numpy array in descending order?

For short arrays I suggest using np.argsort() by finding the indices of the sorted negatived array, which is slightly faster than reversing the sorted array:

In [37]: temp = np.random.randint(1,10, 10)

In [38]: %timeit np.sort(temp)[::-1]
100000 loops, best of 3: 4.65 µs per loop

In [39]: %timeit temp[np.argsort(-temp)]
100000 loops, best of 3: 3.91 µs per loop

Unable to copy file - access to the path is denied

First go to location of the file. Then right click on the folder of the file -> Properties -> Unchecked Read Only Option and apply to files and its sub folders. It resolved my issue. Happy Coding!

Reading and writing to serial port in C on Linux

1) I'd add a /n after init. i.e. write( USB, "init\n", 5);

2) Double check the serial port configuration. Odds are something is incorrect in there. Just because you don't use ^Q/^S or hardware flow control doesn't mean the other side isn't expecting it.

3) Most likely: Add a "usleep(100000); after the write(). The file-descriptor is set not to block or wait, right? How long does it take to get a response back before you can call read? (It has to be received and buffered by the kernel, through system hardware interrupts, before you can read() it.) Have you considered using select() to wait for something to read()? Perhaps with a timeout?

Edited to Add:

Do you need the DTR/RTS lines? Hardware flow control that tells the other side to send the computer data? e.g.

int tmp, serialLines;

cout << "Dropping Reading DTR and RTS\n";
ioctl ( readFd, TIOCMGET, & serialLines );
serialLines &= ~TIOCM_DTR;
serialLines &= ~TIOCM_RTS;
ioctl ( readFd, TIOCMSET, & serialLines );
usleep(100000);
ioctl ( readFd, TIOCMGET, & tmp );
cout << "Reading DTR status: " << (tmp & TIOCM_DTR) << endl;
sleep (2);

cout << "Setting Reading DTR and RTS\n";
serialLines |= TIOCM_DTR;
serialLines |= TIOCM_RTS;
ioctl ( readFd, TIOCMSET, & serialLines );
ioctl ( readFd, TIOCMGET, & tmp );
cout << "Reading DTR status: " << (tmp & TIOCM_DTR) << endl;

Selecting the first "n" items with jQuery

Use lt pseudo selector:

$("a:lt(n)")

This matches the elements before the nth one (the nth element excluded). Numbering starts from 0.

How to change the color of a CheckBox?

If your minSdkVersion is 21+ use android:buttonTint attribute to update the color of a checkbox:

<CheckBox
  ...
  android:buttonTint="@color/tint_color" />

In projects that use AppCompat library and support Android versions below 21 you can use a compat version of the buttonTint attribute:

<CheckBox
  ...
  app:buttonTint="@color/tint_color" />

In this case if you want to subclass a CheckBox don't forget to use AppCompatCheckBox instead.

PREVIOUS ANSWER:

You can change CheckBoxs drawable using android:button="@drawable/your_check_drawable" attribute.

How do I use LINQ Contains(string[]) instead of Contains(string)

The best solution I found was to go ahead and create a Table-Valued Function in SQL that produces the results, such as ::

CREATE function [dbo].[getMatches](@textStr nvarchar(50)) returns @MatchTbl table(
Fullname nvarchar(50) null,
ID nvarchar(50) null
)
as begin
declare @SearchStr nvarchar(50);
set @SearchStr = '%' + @textStr + '%';
insert into @MatchTbl 
select (LName + ', ' + FName + ' ' + MName) AS FullName, ID = ID from employees where LName like @SearchStr;
return;
end

GO

select * from dbo.getMatches('j')

Then, you simply drag the function into your LINQ.dbml designer and call it like you do your other objects. The LINQ even knows the columns of your stored function. I call it out like this ::

Dim db As New NobleLINQ
Dim LNameSearch As String = txt_searchLName.Text
Dim hlink As HyperLink

For Each ee In db.getMatches(LNameSearch)
   hlink = New HyperLink With {.Text = ee.Fullname & "<br />", .NavigateUrl = "?ID=" & ee.ID}
   pnl_results.Controls.Add(hlink)
Next

Incredibly simple and really utlizes the power of SQL and LINQ in the application...and you can, of course, generate any table valued function you want for the same effects!

Using Notepad++ to validate XML against an XSD

In Notepad++ go to Plugins > Plugin manager > Show Plugin Manager then find Xml Tools plugin. Tick the box and click Install
Open XML document you want to validate and click Ctrl+Shift+Alt+M (Or use Menu if this is your preference Plugins > XML Tools > Validate Now).
Following dialog will open:
Click on .... Point to XSD file and I am pretty sure you'll be able to handle things from here.

Hope this saves you some time.

EDIT: Plugin manager was not included in some versions of Notepad++ because many users didn't like commercials that it used to show. If you want to keep an older version, however still want plugin manager, you can get it on github, and install it by extracting the archive and copying contents to plugins and updates folder.
In version 7.7.1 plugin manager is back under a different guise... Plugin Admin so now you can simply update notepad++ and have it back.

Wireshark vs Firebug vs Fiddler - pros and cons?

Fiddler is the winner every time when comparing to Charles.

The "customize rules" feature of fiddler is unparalleled in any http debugger. The ability to write code to manipulate http requests and responses on-the-fly is invaluable to me and the work I do in web development.

There are so many features to fiddler that charles just does not have, and likely won't ever have. Fiddler is light-years ahead.

Split a String into an array in Swift?

I found an Interesting case, that

method 1

var data:[String] = split( featureData ) { $0 == "\u{003B}" }

When I used this command to split some symbol from the data that loaded from server, it can split while test in simulator and sync with test device, but it won't split in publish app, and Ad Hoc

It take me a lot of time to track this error, It might cursed from some Swift Version, or some iOS Version or neither

It's not about the HTML code also, since I try to stringByRemovingPercentEncoding and it's still not work

addition 10/10/2015

in Swift 2.0 this method has been changed to

var data:[String] = featureData.split {$0 == "\u{003B}"}

method 2

var data:[String] = featureData.componentsSeparatedByString("\u{003B}")

When I used this command, it can split the same data that load from server correctly

Conclusion, I really suggest to use the method 2

string.componentsSeparatedByString("")

How can I remove non-ASCII characters but leave periods and spaces using Python?

An easy way to change to a different codec, is by using encode() or decode(). In your case, you want to convert to ASCII and ignore all symbols that are not supported. For example, the Swedish letter å is not an ASCII character:

    >>>s = u'Good bye in Swedish is Hej d\xe5'
    >>>s = s.encode('ascii',errors='ignore')
    >>>print s
    Good bye in Swedish is Hej d

Edit:

Python3: str -> bytes -> str

>>>"Hej då".encode("ascii", errors="ignore").decode()
'hej d'

Python2: unicode -> str -> unicode

>>> u"hej då".encode("ascii", errors="ignore").decode()
u'hej d'

Python2: str -> unicode -> str (decode and encode in reverse order)

>>> "hej d\xe5".decode("ascii", errors="ignore").encode()
'hej d'

Get img thumbnails from Vimeo?

Using jQuery jsonp request:

<script type="text/javascript">
    $.ajax({
        type:'GET',
        url: 'http://vimeo.com/api/v2/video/' + video_id + '.json',
        jsonp: 'callback',
        dataType: 'jsonp',
        success: function(data){
            var thumbnail_src = data[0].thumbnail_large;
            $('#thumb_wrapper').append('<img src="' + thumbnail_src + '"/>');
        }
    });
</script>

<div id="thumb_wrapper"></div>

How can I group data with an Angular filter?

I originally used Plantface's answer, but I didn't like how the syntax looked in my view.

I reworked it to use $q.defer to post-process the data and return a list on unique teams, which is then uses as the filter.

http://plnkr.co/edit/waWv1donzEMdsNMlMHBa?p=preview

View

<ul>
  <li ng-repeat="team in teams">{{team}}
    <ul>
      <li ng-repeat="player in players | filter: {team: team}">{{player.name}}</li> 
    </ul>
  </li>
</ul>

Controller

app.controller('MainCtrl', function($scope, $q) {

  $scope.players = []; // omitted from SO for brevity

  // create a deferred object to be resolved later
  var teamsDeferred = $q.defer();

  // return a promise. The promise says, "I promise that I'll give you your
  // data as soon as I have it (which is when I am resolved)".
  $scope.teams = teamsDeferred.promise;

  // create a list of unique teams. unique() definition omitted from SO for brevity
  var uniqueTeams = unique($scope.players, 'team');

  // resolve the deferred object with the unique teams
  // this will trigger an update on the view
  teamsDeferred.resolve(uniqueTeams);

});

Should I declare Jackson's ObjectMapper as a static field?

Yes, that is safe and recommended.

The only caveat from the page you referred is that you can't be modifying configuration of the mapper once it is shared; but you are not changing configuration so that is fine. If you did need to change configuration, you would do that from the static block and it would be fine as well.

EDIT: (2013/10)

With 2.0 and above, above can be augmented by noting that there is an even better way: use ObjectWriter and ObjectReader objects, which can be constructed by ObjectMapper. They are fully immutable, thread-safe, meaning that it is not even theoretically possible to cause thread-safety issues (which can occur with ObjectMapper if code tries to re-configure instance).

Postgresql: password authentication failed for user "postgres"

Edit the pg_hba.conf file, e.g. with sudo emacs /etc/postgresql/9.3/main/pg_hba.conf

Change all authentication methods to trust. Change Unix Password for "postgres" user. Restart Server. Login with psql -h localhost -U postgres and use the just set Unix password. If it works you can re-set the pg_hba.conf file to the default values.

Jquery/Ajax call with timer

If you want to set something on a timer, you can use JavaScript's setTimeout or setInterval methods:

setTimeout ( expression, timeout );
setInterval ( expression, interval );

Where expression is a function and timeout and interval are integers in milliseconds. setTimeout runs the timer once and runs the expression once whereas setInterval will run the expression every time the interval passes.

So in your case it would work something like this:

setInterval(function() {
    //call $.ajax here
}, 5000); //5 seconds

As far as the Ajax goes, see jQuery's ajax() method. If you run an interval, there is nothing stopping you from calling the same ajax() from other places in your code.

If what you want is for an interval to run every 30 seconds until a user initiates a form submission...and then create a new interval after that, that is also possible:

setInterval() returns an integer which is the ID of the interval.

var id = setInterval(function() {
    //call $.ajax here
}, 30000); // 30 seconds

If you store that ID in a variable, you can then call clearInterval(id) which will stop the progression.

Then you can reinstantiate the setInterval() call after you've completed your ajax form submission.

MySQL: Get column name or alias from query

You could also use MySQLdb.cursors.DictCursor. This turns your result set into a python list of python dictionaries, although it uses a special cursor, thus technically less portable than the accepted answer. Not sure about speed. Here's the edited original code that uses this.

#!/usr/bin/python -u

import MySQLdb
import MySQLdb.cursors

#===================================================================
# connect to mysql
#===================================================================

try:
    db = MySQLdb.connect(host='myhost', user='myuser', passwd='mypass', db='mydb', cursorclass=MySQLdb.cursors.DictCursor)
except MySQLdb.Error, e:
    print 'Error %d: %s' % (e.args[0], e.args[1])
    sys.exit(1)

#===================================================================
# query select from table
#===================================================================

cursor = db.cursor()

sql = 'SELECT ext, SUM(size) AS totalsize, COUNT(*) AS filecount FROM fileindex GROUP BY ext ORDER BY totalsize DESC;'

cursor.execute(sql)
all_rows = cursor.fetchall()

print len(all_rows) # How many rows are returned.
for row in all_rows: # While loops always make me shudder!
    print '%s %s %s\n' % (row['ext'], row['totalsize'], row['filecount'])

cursor.close()
db.close()

Standard dictionary functions apply, for example, len(row[0]) to count the number of columns for the first row, list(row[0]) for a list of column names (for the first row), etc. Hope this helps!

Spring 3 MVC resources and tag <mvc:resources />

As said by @Nancom

<mvc:resources location="/resources/" mapping="/resource/**"/>

So for clarity lets our image is in

resources/images/logo.png"

The location attribute of the mvc:resources tag defines the base directory location of static resources that you want to serve. It can be images path that are available under the src/main/webapp/resources/images/ directory; you may wonder why we have given only /resources/ as the location value instead of src/main/webapp/resources/images/. This is because we consider the resources directory as the base directory for all resources, we can have multiple sub-directories under resources directory to put our images and other static resource files.

The second attribute, mapping, just indicates the request path that needs to be mapped to this resources directory. In our case, we have assigned /resource/** as the mapping value. So, if any web request starts with the /resource request path, then it will be mapped to the resources directory, and the /** symbol indicates the recursive look for any resource files underneath the base resources directory.

So for url like http://localhost:8080/webstore/resource/images/logo.png. So, while serving this web request, Spring MVC will consider /resource/images/logo.png as the request path. So, it will try to map /resource to the base directory specified by the location attribute, resources. From this directory, it will try to look for the remaining path of the URL, which is /images/logo.png. Since we have the images directory under the resources directory, Spring can easily locate the image file from the images directory.

 <mvc:resources location="/resources/" mapping="/resource/**"/>

gives us for given [requests] -> [resource mapping]:

http://localhost:8080/webstore/resource/images/logo.png -> searches in resources/images/logo.png

http://localhost:8080/webstore/resource/images/small/picture.png -> searches in resources/images/small/picture.png

http://localhost:8080/webstore/resource/css/main.css -> searches in resources/css/main.css

http://localhost:8080/webstore/resource/pdf/index.pdf -> searches in resources/pdf/index.pdf

Embed an External Page Without an Iframe?

Why not use PHP! It's all server side:

<?php print file_get_contents("http://foo.com")?>

If you own both sites, you may need to ok this transaction with full declaration of headers at the server end. Works beautifully.

PHP check file extension

pathinfo is what you're looking for

PHP.net

$file_parts = pathinfo($filename);

switch($file_parts['extension'])
{
    case "jpg":
    break;

    case "exe":
    break;

    case "": // Handle file extension for files ending in '.'
    case NULL: // Handle no file extension
    break;
}

height style property doesn't work in div elements

You try to set the height property of an inline element, which is not possible. You can try to make it a block element, or perhaps you meant to alter the line-height property?

Tar archiving that takes input from a list of files

On Solaris, you can use the option -I to read the filenames that you would normally state on the command line from a file. In contrast to the command line, this can create tar archives with hundreds of thousands of files (just did that).

So the example would read

tar -cvf allfiles.tar -I mylist.txt

Why use Ruby's attr_accessor, attr_reader and attr_writer?

Not all attributes of an object are meant to be directly set from outside the class. Having writers for all your instance variables is generally a sign of weak encapsulation and a warning that you're introducing too much coupling between your classes.

As a practical example: I wrote a design program where you put items inside containers. The item had attr_reader :container, but it didn't make sense to offer a writer, since the only time the item's container should change is when it's placed in a new one, which also requires positioning information.

How to disable/enable a button with a checkbox if checked

brbcoding have been able to help me with the appropriate coding i needed, here is it

HTML

<input type="checkbox" id="checkme"/>
  <input type="submit" name="sendNewSms" class="inputButton" disabled="disabled" id="sendNewSms" value=" Send " />

Javascript

 var checker = document.getElementById('checkme');
 var sendbtn = document.getElementById('sendNewSms');
 // when unchecked or checked, run the function
 checker.onchange = function(){
if(this.checked){
    sendbtn.disabled = false;
} else {
    sendbtn.disabled = true;
}

}

Laravel is there a way to add values to a request array

You can also use below code

$request->request->set(key, value).

Fits better for me.

C dynamically growing array

There are a couple of options I can think of.

Linked List. You can use a linked list to make a dynamically growing array like thing. But you won't be able to do array[100] without having to walk through 1-99 first. And it might not be that handy for you to use either.
Large array. Simply create an array with more than enough space for everything
Resizing array. Recreate the array once you know the size and/or create a new array every time you run out of space with some margin and copy all the data to the new array.
Linked List Array combination. Simply use an array with a fixed size and once you run out of space, create a new array and link to that (it would be wise to keep track of the array and the link to the next array in a struct).

It is hard to say what option would be best in your situation. Simply creating a large array is ofcourse one of the easiest solutions and shouldn't give you much problems unless it's really large.

a href link for entire div in HTML/CSS

This can be done in many ways. a. Using nested inside a tag.

<a href="link1.html">
   <div> Something in the div </div>
 </a>

b. Using the Inline JavaScript Method

<div onclick="javascript:window.location.href='link1.html' "> 
  Some Text 
</div>

c. Using jQuery inside tag

HTML:

<div class="demo" > Some text here </div>

jQuery:

$(".demo").click( function() {
  window.location.href="link1.html";
 });

Oracle PL/SQL : remove "space characters" from a string

Since you're comfortable with regular expressions, you probably want to use the REGEXP_REPLACE function. If you want to eliminate anything that matches the [:space:] POSIX class

REGEXP_REPLACE( my_value, '[[:space:]]', '' )


SQL> ed
Wrote file afiedt.buf

  1  select '|' ||
  2         regexp_replace( 'foo ' || chr(9), '[[:space:]]', '' ) ||
  3         '|'
  4*   from dual
SQL> /

'|'||
-----
|foo|

If you want to leave one space in place for every set of continuous space characters, just add the + to the regular expression and use a space as the replacement character.

with x as (
  select 'abc 123  234     5' str
    from dual
)
select regexp_replace( str, '[[:space:]]+', ' ' )
  from x

What is the difference between XAMPP or WAMP Server & IIS?

XAMPP is more powerful and resource taking than WAMP.
WAMP provides support for MySQL and PHP.
XAMPP provides support for MYSQL, PHP and PERL

XAMPP also has SSL feature while WAMP doesnt.
If your applications need to deal with native web apps only, Go for WAMP. If you need advanced features as stated above, go for XAMPP.

As of priority, you cant run both together with default installation as XAMPP gets a higher priority and it takes up ports. So WAMP cant be run in parallel with XAMPP.

Request format is unrecognized for URL unexpectedly ending in

For the record I was getting this error when I moved an old app from one server to another. I added the <add name="HttpGet"/> <add name="HttpPost"/> elements to the web.config, which changed the error to:

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at BitMeter2.DataBuffer.incrementCurrent(Int64 val)
   at BitMeter2.DataBuffer.WindOn(Int64 count, Int64 amount)
   at BitMeter2.DataHistory.windOnBuffer(DataBuffer buffer, Int64 totalAmount, Int32 increments)
   at BitMeter2.DataHistory.NewData(Int64 downloadValue, Int64 uploadValue)
   at BitMeter2.frmMain.tickProcessing(Boolean fromTimerEvent)

In order to fix this error I had to add the ScriptHandlerFactory lines to web.config:

  <system.webServer>
    <handlers>
      <remove name="ScriptHandlerFactory" />
      <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    </handlers>
  </system.webServer>

Why it worked without these lines on one web server and not the other I don't know.

'Conda' is not recognized as internal or external command

In addition to adding C:\Users\yourusername\Anaconda3 and C:\Users\yourusername\Anaconda3\Scripts, as recommended by Raja (above), also add C:\Users\yourusername\Anaconda3\Library\bin to your path variable. This will prevent an SSL error that is bound to happen if you're performing this on a fresh install of Anaconda.

Are arrays in PHP copied as value or as reference to new variables, and when passed to functions?

For the second part of your question, see the array page of the manual, which states (quoting) :

Array assignment always involves value copying. Use the reference operator to copy an array by reference.

And the given example :

<?php
$arr1 = array(2, 3);
$arr2 = $arr1;
$arr2[] = 4; // $arr2 is changed,
             // $arr1 is still array(2, 3)

$arr3 = &$arr1;
$arr3[] = 4; // now $arr1 and $arr3 are the same
?>

For the first part, the best way to be sure is to try ;-)

Consider this example of code :

function my_func($a) {
    $a[] = 30;
}

$arr = array(10, 20);
my_func($arr);
var_dump($arr);

It'll give this output :

array
  0 => int 10
  1 => int 20

Which indicates the function has not modified the "outside" array that was passed as a parameter : it's passed as a copy, and not a reference.

If you want it passed by reference, you'll have to modify the function, this way :

function my_func(& $a) {
    $a[] = 30;
}

And the output will become :

array
  0 => int 10
  1 => int 20
  2 => int 30

As, this time, the array has been passed "by reference".

Don't hesitate to read the References Explained section of the manual : it should answer some of your questions ;-)

How to retrieve checkboxes values in jQuery

You can also return all selected checkboxes value in comma separated string. This will also make it easier for you when you send it as a parameter to SQL

Here is a sample that return all selected checkboxes values that have the name "chkboxName" in comma separate string

And here is the javascript

function showSelectedValues()
{
  alert($("input[name=chkboxName]:checked").map(function () {
    return this.value;
  }).get().join(","));
}

Here is the HTML sample

<html>
  <head>
 </head>
 <body>
  <div>
   <input name="chkboxName" type="checkbox" value="one_name" checked>
   <input name="chkboxName" type="checkbox" value="one_name1">
   <input name="chkboxName" type="checkbox" value="one_name2">
  </div>  
 </body>
 </html>

Change Text Color of Selected Option in a Select Box

<html>
  <style>
.selectBox{
 color:White;
}
.optionBox{
  color:black;
}

</style>
<body>
<select class = "selectBox">
  <option class = "optionBox">One</option>
  <option class = "optionBox">Two</option>
  <option class = "optionBox">Three</option>
</select>

How can I convert tabs to spaces in every file of a directory?

You can use the generally available pr command (man page here). For example, to convert tabs to four spaces, do this:

pr -t -e=4 file > file.expanded

-t suppresses headers
-e=num expands tabs to num spaces

To convert all files in a directory tree recursively, while skipping binary files:

#!/bin/bash
num=4
shopt -s globstar nullglob
for f in **/*; do
  [[ -f "$f" ]]   || continue # skip if not a regular file
  ! grep -qI "$f" && continue # skip binary files
  pr -t -e=$num "$f" > "$f.expanded.$$" && mv "$f.expanded.$$" "$f"
done

The logic for skipping binary files is from this post.

NOTE:

Doing this could be dangerous in a git or svn repo
This is not the right solution if you have code files that have tabs embedded in string literals

What is the difference between supervised learning and unsupervised learning?

Supervised learning

You have input x and a target output t. So you train the algorithm to generalize to the missing parts. It is supervised because the target is given. You are the supervisor telling the algorithm: For the example x, you should output t!

Unsupervised learning

Although segmentation, clustering and compression are usually counted in this direction, I have a hard time to come up with a good definition for it.

Let's take auto-encoders for compression as an example. While you only have the input x given, it is the human engineer how tells the algorithm that the target is also x. So in some sense, this is not different from supervised learning.

And for clustering and segmentation, I'm not too sure if it really fits the definition of machine learning (see other question).

How to check if array is not empty?

If you are talking about Python's actual array (available through import array from array), then the principle of least astonishment applies and you can check whether it is empty the same way you'd check if a list is empty.

from array import array
an_array = array('i') # an array of ints

if an_array:
    print("this won't be printed")

an_array.append(3)

if an_array:
    print("this will be printed")

Running ASP.Net on a Linux based server

So I know this is an older question but I think it could stand an updated answer.

Microsoft has officially released asp.net vnext and its open source and deploy-able to both Linux and Mac. Its all still pretty new but does rely on the latest builds of mono and thus currently needs you to compile the mono-framework but in time I suspect that it will be easier to access as various linux distros release updated versions of mono. This is a how to setup guide

This information may be somewhat volatile and with updates is due to change.

Update ASP.NET CORE 11/10/2017

asp.net vnext is now known as asp.net core.
asp.net core is being treated as a high priority in Microsoft due in part to its use with microservice architecture and docker and container technologies
It has become much more compatible with existing .net libraries due to .net standard 2.0.
It performs well when compared to other technology stacks such as go and node.js

How to run a .jar in mac?

You don't need JDK to run Java based programs. JDK is for development which stands for Java Development Kit.

You need JRE which should be there in Mac.

Try: java -jar Myjar_file.jar

EDIT: According to this article, for Mac OS 10

The Java runtime is no longer installed automatically as part of the OS installation.

Then, you need to install JRE to your machine.

CURL and HTTPS, "Cannot resolve host"

add yourlocalhost
ex. 127.0.0.1 cards.localhost in the /etc/hosts directory. Now restart apache server

Python main call within class

Well, first, you need to actually define a function before you can run it (and it doesn't need to be called main). For instance:

class Example(object):
    def run(self):
        print "Hello, world!"

if __name__ == '__main__':
    Example().run()

You don't need to use a class, though - if all you want to do is run some code, just put it inside a function and call the function, or just put it in the if block:

def main():
    print "Hello, world!"

if __name__ == '__main__':
    main()

if __name__ == '__main__':
    print "Hello, world!"

Android setOnClickListener method - How does it work?

That what manual says about setOnClickListener method is:

public void setOnClickListener (View.OnClickListener l)

Added in API level 1 Register a callback to be invoked when this view is clicked. If this view is not clickable, it becomes clickable.

Parameters

l View.OnClickListener: The callback that will run

And normally you have to use it like this

public class ExampleActivity extends Activity implements OnClickListener {
    protected void onCreate(Bundle savedValues) {
        ...
        Button button = (Button)findViewById(R.id.corky);
        button.setOnClickListener(this);
    }

    // Implement the OnClickListener callback
    public void onClick(View v) {
      // do something when the button is clicked
    }
    ...
}

Take a look at this lesson as well Building a Simple Calculator using Android Studio.

How do you setLayoutParams() for an ImageView?

An ImageView gets setLayoutParams from View which uses ViewGroup.LayoutParams. If you use that, it will crash in most cases so you should use getLayoutParams() which is in View.class. This will inherit the parent View of the ImageView and will work always. You can confirm this here: ImageView extends view

Assuming you have an ImageView defined as 'image_view' and the width/height int defined as 'thumb_size'

The best way to do this:

ViewGroup.LayoutParams iv_params_b = image_view.getLayoutParams();
iv_params_b.height = thumb_size;
iv_params_b.width = thumb_size;
image_view.setLayoutParams(iv_params_b);

Using local makefile for CLion instead of CMake

Newest version has better support literally for any generated Makefiles, through the compiledb

Three steps:

install compiledb
```
pip install compiledb
```
run a dry make
```
compiledb -n make 
```
(do the autogen, configure if needed)
there will be a compile_commands.json file generated open the project and you will see CLion will load info from the json file. If you your CLion still try to find CMakeLists.txt and cannot read compile_commands.json, try to remove the entire folder, re-download the source files, and redo step 1,2,3

Orignal post: Working with Makefiles in CLion using Compilation DB

Format date as dd/MM/yyyy using pipes

The only thing that worked for me was inspired from here: https://stackoverflow.com/a/35527407/2310544

For pure dd/MM/yyyy, this worked for me, with angular 2 beta 16:

{{ myDate | date:'d'}}/{{ myDate | date:'MM'}}/{{ myDate | date:'y'}}

How do I break out of nested loops in Java?

If it is inside some function why don't you just return it:

for (Type type : types) {
    for (Type t : types2) {
         if (some condition) {
            return value;
         }
    }
}

Add borders to cells in POI generated Excel File

In the newer apache poi versions:

XSSFCellStyle style = workbook.createCellStyle();
style.setBorderTop(BorderStyle.MEDIUM);
style.setBorderBottom(BorderStyle.MEDIUM);
style.setBorderLeft(BorderStyle.MEDIUM);
style.setBorderRight(BorderStyle.MEDIUM);

How to remove specific element from an array using python

Using filter() and lambda would provide a neat and terse method of removing unwanted values:

newEmails = list(filter(lambda x : x != '[email protected]', emails))

This does not modify emails. It creates the new list newEmails containing only elements for which the anonymous function returned True.

Laravel Eloquent where field is X or null

It sounds like you need to make use of advanced where clauses.

Given that search in field1 and field2 is constant we will leave them as is, but we are going to adjust your search in datefield a little.

Try this:

$query = Model::where('field1', 1)
    ->whereNull('field2')
    ->where(function ($query) {
        $query->where('datefield', '<', $date)
            ->orWhereNull('datefield');
    }
);

If you ever need to debug a query and see why it isn't working, it can help to see what SQL it is actually executing. You can chain ->toSql() to the end of your eloquent query to generate the SQL.

Shell script to get the process ID on Linux

You can use the command killall:

$ killall ruby

How to filter an array from all elements of another array

The following examples use new Set() to create a filtered array that has only unique elements:

Array with primitive data types: string, number, boolean, null, undefined, symbol:

const a = [1, 2, 3, 4];
const b = [3, 4, 5];
const c = Array.from(new Set(a.concat(b)));

Array with objects as items:

const a = [{id:1}, {id: 2}, {id: 3}, {id: 4}];
const b = [{id: 3}, {id: 4}, {id: 5}];
const stringifyObject = o => JSON.stringify(o);
const parseString = s => JSON.parse(s);
const c = Array.from(new Set(a.concat(b).map(stringifyObject)), parseString);

C# DataTable.Select() - How do I format the filter criteria to include null?

try this:

var result = from r in myDataTable.AsEnumerable()  
            where r.Field<string>("Name") != "n/a" &&  
                  r.Field<string>("Name") != "" select r;  
DataTable dtResult = result.CopyToDataTable();

How do I import a namespace in Razor View Page?

"using MyNamespace" works in MVC3 RTM. Hope this helps.

Programs & Examples On #Twitter feed

Check mySQL version on Mac 10.8.5

Filter output in logcat by tagname

How to read PDF files using Java?

How to find the operating system version using JavaScript?

What is the function __construct used for?

Get a random boolean in python?

Restore a deleted file in the Visual Studio Code Recycle Bin

Pretty-print a Map in Java

Include .so library in apk in android studio

Are there other whitespace codes like &nbsp for half-spaces, em-spaces, en-spaces etc useful in HTML?

jQuery find events handlers registered with an object

Make the image go behind the text and keep it in center using CSS

Delete files or folder recursively on Windows CMD

Post-increment and Pre-increment concept?

Delete specific line number(s) from a text file using sed?

Is key-value observation (KVO) available in Swift?

how to download image from any web page in java

Binding a Button's visibility to a bool value in ViewModel

How to stop/shut down an elasticsearch node?

Function inside a function.?

Running Python from Atom

Locate Git installation folder on Mac OS X

Excel CSV. file with more than 1,048,576 rows of data

hibernate - get id after save object

Extreme wait-time when taking a SQL Server database offline

How to edit log message already committed in Subversion?

Assigning a function to a variable

AppCompat v7 r21 returning error in values.xml?

How to my "exe" from PyCharm project

Git: Remove committed file after push

FormData.append("key", "value") is not working

What is the syntax for Typescript arrow functions with generics?

Better way to convert file sizes in Python

Using regular expression in css?

Add new attribute (element) to JSON object using JavaScript

Retrieving subfolders names in S3 bucket from boto3

How would I get everything before a : in a string Python

TLDR

Code

Results

No assembly found containing an OwinStartupAttribute Error

How to check if an element is visible with WebDriver

What are the differences between git branch, fork, fetch, merge, rebase and clone?

Sorting HashMap by values

Post multipart request with Android SDK

How to mark a method as obsolete or deprecated?

What does file:///android_asset/www/index.html mean?

Setting background colour of Android layout element

CSS background opacity with rgba not working in IE 8

find the array index of an object with a specific key value in underscore

Entity Framework (EF) Code First Cascade Delete for One-to-Zero-or-One relationship

Android - shadow on text?

jQuery append and remove dynamic table row

ActiveRecord OR query

How to get bean using application context in spring boot

correct way to use super (argument passing)

How do I convert strings between uppercase and lowercase in Java?

"Application tried to present modally an active controller"?

How can one run multiple versions of PHP 5.x on a development LAMP server?

Emulator error: This AVD's configuration is missing a kernel file

$(document).click() not working correctly on iPhone. jquery

Golang read request body

C# convert int to string with padding zeros?

How to use format() on a moment.js duration?

mySQL convert varchar to date

How can I open an Excel file in Python?

how do I get eclipse to use a different compiler version for Java?

Is the size of C "int" 2 bytes or 4 bytes?

adding multiple entries to a HashMap at once in one statement

Easiest way to toggle 2 classes in jQuery

Jquery and HTML FormData returns "Uncaught TypeError: Illegal invocation"

Django {% with %} tags within {% if %} {% else %} tags?

Python Dictionary Comprehension

SQLSTATE[28000] [1045] Access denied for user 'root'@'localhost' (using password: YES) Symfony2

Adding subscribers to a list using Mailchimp's API v3

How to truncate string using SQL server

What's the name for hyphen-separated case?

int *array = new int[n]; what is this function actually doing?

How to call a method after bean initialization is complete?