SyntaxFix

Programs & Examples On #Libqxt

LibQxt is an extension library for the Qt framework.

Get Category name from Post ID

here you go get_the_category( $post->ID ); will return the array of categories of that post you need to loop through the array

$category_detail=get_the_category('4');//$post->ID
foreach($category_detail as $cd){
echo $cd->cat_name;
}

get_the_category

How to create a global variable?

if you want to use it in all of your classes you can use:

public var yourVariable = "something"

if you want to use just in one class you can use :

var yourVariable = "something"

Uncaught Typeerror: cannot read property 'innerHTML' of null

run the code after your html structure in the body statement 

    <html>
    <body>
    <p>asdasd</p>
    <p>asdasd</p>
    <p>asdasd</p>
    <script src="myfile.js"></script>
    </body>
    </html>

Convert varchar2 to Date ('MM/DD/YYYY') in PL/SQL

First you convert VARCHAR to DATE and then back to CHAR. I do this almost every day and never found any better way.

select TO_CHAR(TO_DATE(DOJ,'MM/DD/YYYY'), 'MM/DD/YYYY') from EmpTable

How to get page content using cURL?

this is how: 

   /**
     * Get a web file (HTML, XHTML, XML, image, etc.) from a URL.  Return an
     * array containing the HTTP server response header fields and content.
     */
    function get_web_page( $url )
    {
        $user_agent='Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0';

        $options = array(

            CURLOPT_CUSTOMREQUEST  =>"GET",        //set request type post or get
            CURLOPT_POST           =>false,        //set to GET
            CURLOPT_USERAGENT      => $user_agent, //set user agent
            CURLOPT_COOKIEFILE     =>"cookie.txt", //set cookie file
            CURLOPT_COOKIEJAR      =>"cookie.txt", //set cookie jar
            CURLOPT_RETURNTRANSFER => true,     // return web page
            CURLOPT_HEADER         => false,    // don't return headers
            CURLOPT_FOLLOWLOCATION => true,     // follow redirects
            CURLOPT_ENCODING       => "",       // handle all encodings
            CURLOPT_AUTOREFERER    => true,     // set referer on redirect
            CURLOPT_CONNECTTIMEOUT => 120,      // timeout on connect
            CURLOPT_TIMEOUT        => 120,      // timeout on response
            CURLOPT_MAXREDIRS      => 10,       // stop after 10 redirects
        );

        $ch      = curl_init( $url );
        curl_setopt_array( $ch, $options );
        $content = curl_exec( $ch );
        $err     = curl_errno( $ch );
        $errmsg  = curl_error( $ch );
        $header  = curl_getinfo( $ch );
        curl_close( $ch );

        $header['errno']   = $err;
        $header['errmsg']  = $errmsg;
        $header['content'] = $content;
        return $header;
    }

Example

//Read a web page and check for errors:

$result = get_web_page( $url );

if ( $result['errno'] != 0 )
    ... error: bad url, timeout, redirect loop ...

if ( $result['http_code'] != 200 )
    ... error: no page, no permissions, no service ...

$page = $result['content'];

Understanding timedelta

why do I have to pass seconds = uptime to timedelta

Because timedelta objects can be passed seconds, milliseconds, days, etc... so you need to specify what are you passing in (this is why you use the explicit key). Typecasting to int is superfluous as they could also accept floats.

and why does the string casting works so nicely that I get HH:MM:SS ?

It's not the typecasting that formats, is the internal __str__ method of the object. In fact you will achieve the same result if you write:

print datetime.timedelta(seconds=int(uptime))

How to get all properties values of a JavaScript Object (without knowing the keys)?

If you have access to Underscore.js, you can use the _.values function like this:

_.values({one : 1, two : 2, three : 3}); // return [1, 2, 3]

How to resolve ambiguous column names when retrieving results?

@Jason. You are correct except that php is the culprit and not mysql. If you put your JOIN in Mysql Workbench you will get three columns with the exact same name (one for each table) but not with the same data (some will be null if that table has no match for the JOIN).

In php if you use MYSQL_NUM in mysql_fetch_array() then you will get all columns. The problem is when you use mysql_fetch_array() with MYSQL_ASSOC. Then, inside that function, php is building the return value like so:

$row['dup'] = [value from table1]

and later on...

$row['dup'] = [value from table2]

...

$row['dup'] = [value from table3]

So you will get only the value from table3. The problem is that a result set from mysql can contain columns with the same name but associative arrays in php don't allow duplicate keys in arrays. When the data is saved in associative arrays, in php, some information is silently lost...

@selector() in Swift?

Just in case somebody else have the same problem I had with NSTimer where none of the other answers fixed the issue, is really important to mention that, if you are using a class that do not inherits from NSObject either directly or deep in the hierarchy(e.g. manually created swift files), none of the other answers will work even when is specified as follows:

let timer = NSTimer(timeInterval: 1, target: self, selector: "test", 
                    userInfo: nil, repeats: false)
func test () {}

Without changing anything else other than just making the class inherit from NSObject I stopped getting the "Unrecognized selector" Error and got my logic working as expected.

how to fix stream_socket_enable_crypto(): SSL operation failed with code 1

How to fix on Laravel 7:

Download the latest cacert.pem file from cURL website.

wget https://curl.haxx.se/ca/cacert.pem

Edit php.ini (you can do php --ini to find it), update (or create if they don't exist already) those two lines:

curl.cainfo="/path/to/downloaded/cacert.pem"
...
openssl.cafile="/path/to/downloaded/cacert.pem"

Those lines should already exist but commented out, so uncomment them and edit both values with the path to the downloaded cacert.pem

Restart PHP and Nginx/Apache.

Edit: You may need to chown/chmod the downloaded certificate file so PHP (and its user) can read it.

source

Best way to split string into lines

  • If it looks ugly, just remove the unnecessary ToCharArray call.

  • If you want to split by either \n or \r, you've got two options:

    • Use an array literal – but this will give you empty lines for Windows-style line endings \r\n:

      var result = text.Split(new [] { '\r', '\n' });

    • Use a regular expression, as indicated by Bart:

      var result = Regex.Split(text, "\r\n|\r|\n");

  • If you want to preserve empty lines, why do you explicitly tell C# to throw them away? (StringSplitOptions parameter) – use StringSplitOptions.None instead.

How to insert current_timestamp into Postgres via python

 
from datetime import datetime as dt

then use this in your code:

cur.execute('INSERT INTO my_table (dt_col) VALUES (%s)', (dt.now(),))

"The remote certificate is invalid according to the validation procedure." using Gmail SMTP server

The code from the accepted answer helped me to debug the issue. I then realized that the SN field of the certificate argument wasn't the same as what I thought was my SMTP server. By setting the Host property of the SmtpClient instance to the SN value of the certificate I was able to fix the issue.

The instance of entity type cannot be tracked because another instance of this type with the same key is already being tracked

I had the same issue (EF Core) while setting up xUnit tests. What 'fixed' it for me in testing was looping through the change tracker entities after setting up the seed data.

  • at the bottom of the SeedAppDbContext() method.

I set up a Test Mock Context:

/// <summary>
/// Get an In memory version of the app db context with some seeded data
/// </summary>
public static AppDbContext GetAppDbContext(string dbName)
{
    //set up the options to use for this dbcontext
    var options = new DbContextOptionsBuilder<AppDbContext>()
        .UseInMemoryDatabase(databaseName: dbName)
        //.UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking)
        .Options;

    var dbContext = new AppDbContext(options);
    dbContext.SeedAppDbContext();
    return dbContext;
}

Extension method to add some seed data:

  • and detach entities in foreach loop at bottom of method.
    public static void SeedAppDbContext(this AppDbContext appDbContext)
    {
       // add companies
       var c1 = new Company() { Id = 1, CompanyName = "Fake Company One", ContactPersonName = "Contact one", eMail = "[email protected]", Phone = "0123456789", AdminUserId = "" };
       c1.Address = new Address() { Id = 1, AddressL1 = "Field Farm", AddressL2 = "Some Lane", City = "some city", PostalCode = "AB12 3CD" };
       appDbContext.CompanyRecords.Add(c1);
                        
       var nc1 = new Company() { Id = 2, CompanyName = "Test Company 2", ContactPersonName = "Contact two", eMail = "[email protected]", Phone = "0123456789", Address = new Address() { }, AdminUserId = "" };
       nc1.Address = new Address() { Id = 2, AddressL1 = "The Barn", AddressL2 = "Some Lane", City = "some city", PostalCode = "AB12 3CD" };
       appDbContext.CompanyRecords.Add(nc1);

       //....and so on....
            
       //last call to commit everything to the memory db
       appDbContext.SaveChanges();

       //and then to detach everything 
       foreach (var entity in appDbContext.ChangeTracker.Entries())
       {
           entity.State = EntityState.Detached;
       }
    }

The controller put method

The .ConvertTo<>() Method is an extension method from ServiceStack

 [HttpPut]
public async Task<IActionResult> PutUpdateCompany(CompanyFullDto company)
{
    if (0 == company.Id)
        return BadRequest();
    try
    {
        Company editEntity = company.ConvertTo<Company>();
        
        //Prior to detaching an error thrown on line below (another instance with id)
        var trackedEntity = _appDbContext.CompanyRecords.Update(editEntity);
        

        await _appDbContext.SaveChangesAsync();
    }
    catch (DbUpdateConcurrencyException dbError)
    {
        if (!CompanyExists(company.Id))
            return NotFound();
        else
            return BadRequest(dbError);
    }
    catch (Exception Error)
    {
        return BadRequest(Error);
    }
    return Ok();
}

and the test:

    [Fact]
    public async Task PassWhenEditingCompany()
    {
        var _appDbContext = AppDbContextMocker.GetAppDbContext(nameof(CompaniesController));
        var _controller = new CompaniesController(null, _appDbContext);

        //Arrange
        const string companyName = "Fake Company One";
        const string contactPerson = "Contact one";

        const string newCompanyName = "New Fake Company One";
        const string newContactPersonName = "New Contact Person";

        //Act
        var getResult = _controller.GetCompanyById(1);
        var getEntity = (getResult.Result.Result as OkObjectResult).Value;
        var entityDto = getEntity as CompanyFullDto;


        //Assert
        Assert.Equal(companyName, entityDto.CompanyName);
        Assert.Equal(contactPerson, entityDto.ContactPersonName);
        Assert.Equal(1, entityDto.Id);

        //Arrange
        Company entity = entityDto.ConvertTo<Company>();
        entity.CompanyName = newCompanyName;
        entity.ContactPersonName = newContactPersonName;
        CompanyFullDto entityDtoUpd = entity.ConvertTo<CompanyFullDto>();

        //Act
        var result = await _controller.PutUpdateCompany(entityDtoUpd) as StatusCodeResult;

        //Assert           
        Assert.True(result.StatusCode == 200);

        //Act
        getResult = _controller.GetCompanyById(1);
        getEntity = (getResult.Result.Result as OkObjectResult).Value;
        
        entityDto = getEntity as CompanyFullDto;
        
        //Assert
        Assert.Equal(1, entityDto.Id); // didn't add a new record
        Assert.Equal(newCompanyName, entityDto.CompanyName); //updated the name
        Assert.Equal(newContactPersonName, entityDto.ContactPersonName); //updated the contact

//make sure to dispose of the _appDbContext otherwise running the full test will fail.
_appDbContext.Dispose();
    }

Send SMTP email using System.Net.Mail via Exchange Online (Office 365)

Have you seen this? Sending email using Smtp.mail.microsoftonline.com

Setting the UseDefaultCredentials after setting the Credentials would be resetting your Credentials property.

Implement specialization in ER diagram

So I assume your permissions table has a foreign key reference to admin_accounts table. If so because of referential integrity you will only be able to add permissions for account ids exsiting in the admin accounts table. Which also means that you wont be able to enter a user_account_id [assuming there are no duplicates!]

How to upgrade Git to latest version on macOS?

I prefer not to alter the path hierarchy, but instead deal with git specifically...knowing that I'm never going to use old git to do what new git will now manage. This is a brute force solution.

NOTE: I installed XCode on Yosemite (10.10.2) clean first.

I then installed from the binary available on git-scm.com. 

$ which git
/usr/bin/git
$ cd /usr/bin
$ sudo ln -sf /usr/local/git/bin/git
$ sudo ln -sf /usr/local/git/bin/git-credential-osxkeychain
$ sudo ln -sf /usr/local/git/bin/git-cvsserver
$ sudo ln -sf /usr/local/git/bin/git-receive-pack
$ sudo ln -sf /usr/local/git/bin/git-shell
$ sudo ln -sf /usr/local/git/bin/git-upload-archive
$ sudo ln -sf /usr/local/git/bin/git-upload-pack
$ ls -la
(you should see your new symlinks)

The listener supports no services

You need to add your ORACLE_HOME definition in your listener.ora file. Right now its not registered with any ORACLE_HOME.

Sample listener.ora

abc =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = abc.kma.com)(PORT = 1521))
    )
  )

SID_LIST_abc =
  (SID_LIST =
    (SID_DESC =
      (ORACLE_HOME= /abc/DbTier/11.2.0)
      (SID_NAME = abc)
    )
  )

WARNING: Exception encountered during context initialization - cancelling refresh attempt
  1. To closed ideas,
  2. To remove all folder and file C:/Users/UserName/.m2/org/*,
  3. Open ideas and update Maven project,(right click on project -> maven->update maven project)
  4. After that update the project.

Java FileWriter how to write to next Line

.newLine() is the best if your system property line.separator is proper . and sometime you don't want to change the property runtime . So alternative solution is appending \n

How do I extract a substring from a string until the second space is encountered?

Something like this:

int i = str.IndexOf(' ');
i = str.IndexOf(' ', i + 1);
return str.Substring(i);

How to return multiple values?

You can do something like this:

public class Example
{
    public String name;
    public String location;

    public String[] getExample()
    {
        String ar[] = new String[2];
        ar[0]= name;
        ar[1] =  location;
        return ar; //returning two values at once
    }
}

SVN Error: Commit blocked by pre-commit hook (exit code 1) with output: Error: n/a (6)

I got the error as, "svn: Commit blocked by pre-commit hook (exit code 1) with output: Failed with exception: Lost connection to MySQL server at 'reading initial communication packet', system error: 104."

I tried 'svn commit' after 'svn cleanup'. And It works fine!.

jQuery - find child with a specific class

Based on your comment, moddify this:

$( '.bgHeaderH2' ).html (); // will return whatever is inside the DIV

to:

$( '.bgHeaderH2', $( this ) ).html (); // will return whatever is inside the DIV

More about selectors: https://api.jquery.com/category/selectors/

JDK on OSX 10.7 Lion

You can download the 10.7 Lion JDK from http://connect.apple.com.

  1. Sign in and click the java section on the right.

  2. The jdk is installed into a different location then previous. This will result in IDEs (such as Eclipse) being unable to locate source code and javadocs.

  3. At the time of writing the JDK ended up here:

    /Library/Java/JavaVirtualMachines/1.6.0_26-b03-383.jdk/Contents/Home

  4. Open up eclipse preferences and go to Java --> Installed JREs page

  5. Rather than use the "JVM Contents (MacOS X Default) we will need to use the JDK location

  6. At the time of writing Search is not aware of the new JDK location; we we will need to click on the Add button

  7. From the Add JRE wizard choose "MacOS X VM" for the JRE Type

  8. For the JRE Definition Page we need to fill in the following:

    • JRE Home: /Library/Java/JavaVirtualMachines/1.6.0_26-b03-383.jdk/Contents/Home

  9. The other fields will now auto fill, with the default JRE name being "Home". You can quickly correct this to something more meaningful:

    • JRE name: System JDK

  10. Finish the wizard and return to the Installed JREs page

  11. Choose "System JDK" from the list

  12. You can now develop normally with:

    • javadocs correctly shown for base classes
    • source code correctly shown when debugging

Check if an apt-get package is installed and then install it if it's not on Linux

In Bash:

PKG="emacs"
dpkg-query -l $PKG > /dev/null || sudo apt install $PKG

Note that you can have a string with several packages in PKG.

JavaScript: Upload file

Pure JS

You can use fetch optionally with await-try-catch

let photo = document.getElementById("image-file").files[0];
let formData = new FormData();
     
formData.append("photo", photo);
fetch('/upload/image', {method: "POST", body: formData});

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async function SavePhoto(inp) 
{
    let user = { name:'john', age:34 };
    let formData = new FormData();
    let photo = inp.files[0];      
         
    formData.append("photo", photo);
    formData.append("user", JSON.stringify(user)); 
    
    const ctrl = new AbortController()    // timeout
    setTimeout(() => ctrl.abort(), 5000);
    
    try {
       let r = await fetch('/upload/image', 
         {method: "POST", body: formData, signal: ctrl.signal}); 
       console.log('HTTP response code:',r.status); 
    } catch(e) {
       console.log('Huston we have problem...:', e);
    }
    
}
_x000D_ 
<input id="image-file" type="file" onchange="SavePhoto(this)" >
<br><br>
Before selecting the file open chrome console > network tab to see the request details.
<br><br>
<small>Because in this example we send request to https://stacksnippets.net/upload/image the response code will be 404 ofcourse...</small>

<br><br>
(in stack overflow snippets there is problem with error handling, however in <a href="https://jsfiddle.net/Lamik/b8ed5x3y/5/">jsfiddle version</a> for 404 errors 4xx/5xx are <a href="https://stackoverflow.com/a/33355142/860099">not throwing</a> at all but we can read response status which contains code)
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Old school approach - xhr

let photo = document.getElementById("image-file").files[0];  // file from input
let req = new XMLHttpRequest();
let formData = new FormData();

formData.append("photo", photo);                                
req.open("POST", '/upload/image');
req.send(formData);

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function SavePhoto(e) 
{
    let user = { name:'john', age:34 };
    let xhr = new XMLHttpRequest();
    let formData = new FormData();
    let photo = e.files[0];      
    
    formData.append("user", JSON.stringify(user));   
    formData.append("photo", photo);
    
    xhr.onreadystatechange = state => { console.log(xhr.status); } // err handling
    xhr.timeout = 5000;
    xhr.open("POST", '/upload/image'); 
    xhr.send(formData);
}
_x000D_ 
<input id="image-file" type="file" onchange="SavePhoto(this)" >
<br><br>
Choose file and open chrome console > network tab to see the request details.
<br><br>
<small>Because in this example we send request to https://stacksnippets.net/upload/image the response code will be 404 ofcourse...</small>

<br><br>
(the stack overflow snippets, has some problem with error handling - the xhr.status is zero (instead of 404) which is similar to situation when we run script from file on <a href="https://stackoverflow.com/a/10173639/860099">local disc</a> - so I provide also js fiddle version which shows proper http error code <a href="https://jsfiddle.net/Lamik/k6jtq3uh/2/">here</a>)
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SUMMARY

  • In server side you can read original file name (and other info) which is automatically included to request by browser in filename formData parameter.
  • You do NOT need to set request header Content-Type to multipart/form-data - this will be set automatically by browser.
  • Instead of /upload/image you can use full address like http://.../upload/image.
  • If you want to send many files in single request use multiple attribute: <input multiple type=... />, and attach all chosen files to formData in similar way (e.g. photo2=...files[2];... formData.append("photo2", photo2);)
  • You can include additional data (json) to request e.g. let user = {name:'john', age:34} in this way: formData.append("user", JSON.stringify(user));
  • You can set timeout: for fetch using AbortController, for old approach by xhr.timeout= milisec
  • This solutions should work on all major browsers.

How to set scope property with ng-init?

I had some trouble with $scope.$watch but after a lot of testing I found out that my data-ng-model="User.UserName" was badly named and after I changed it to data-ng-model="UserName" everything worked fine. I expect it to be the . in the name causing the issue.

Random word generator- Python

Reading a local word list

If you're doing this repeatedly, I would download it locally and pull from the local file. *nix users can use /usr/share/dict/words.

Example:

word_file = "/usr/share/dict/words"
WORDS = open(word_file).read().splitlines()

Pulling from a remote dictionary

If you want to pull from a remote dictionary, here are a couple of ways. The requests library makes this really easy (you'll have to pip install requests):

import requests

word_site = "https://www.mit.edu/~ecprice/wordlist.10000"

response = requests.get(word_site)
WORDS = response.content.splitlines()

Alternatively, you can use the built in urllib2.

import urllib2

word_site = "https://www.mit.edu/~ecprice/wordlist.10000"

response = urllib2.urlopen(word_site)
txt = response.read()
WORDS = txt.splitlines()

How do you execute SQL from within a bash script?

I've used the jdbcsql project on Sourceforge.

On *nix systems, this will create a csv stream of results to standard out:

java -Djava.security.egd=file///dev/urandom -jar jdbcsql.jar -d oracledb_SID -h $host -p 1521 -U some_username -m oracle -P "$PW" -f excel -s "," "$1"

Note that adding the -Djava.security.egd=file///dev/urandom increases performance greatly

Windows commands are similar: see http://jdbcsql.sourceforge.net/

How to list all Git tags?

Listing the available tags in Git is straightforward. Just type git tag (with optional -l or --list).

$ git tag
v5.5
v6.5

You can also search for tags that match a particular pattern.

$ git tag -l "v1.8.5*"
v1.8.5
v1.8.5-rc0
v1.8.5-rc1
v1.8.5-rc2

Getting latest tag on git repository

The command finds the most recent tag that is reachable from a commit. If the tag points to the commit, then only the tag is shown. Otherwise, it suffixes the tag name with the number of additional commits on top of the tagged object and the abbreviated object name of the most recent commit.

git describe

With --abbrev set to 0, the command can be used to find the closest tagname without any suffix:

git describe --abbrev=0

Other examples:

git describe --abbrev=0 --tags # gets tag from current branch
git describe --tags `git rev-list --tags --max-count=1` // gets tags across all branches, not just the current branch

How to prune local git tags that don't exist on remote

To put it simple, if you are trying to do something like git fetch -p -t, it will not work starting with git version 1.9.4.

However, there is a simple workaround that still works in latest versions:

git tag -l | xargs git tag -d  // remove all local tags
git fetch -t                   // fetch remote tags

Best dynamic JavaScript/JQuery Grid

Have a look at agiletoolkit.org as this has a simple to use CRUD which supports 2,4,6,7,9,10 and 12 out of the box (uses Ajax to defender the grid when adding,deleting data and it integrates with jquery.

I would post some examples but on an iPad at the moment.

Center image using text-align center?

I came across this post, and it worked for me:

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img {_x000D_
  position: absolute;_x000D_
  top: 0;_x000D_
  bottom: 0;_x000D_
  left: 0;_x000D_
  right: 0;_x000D_
  margin: auto;_x000D_
}
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<div style="border: 1px solid black; position:relative; min-height: 200px">_x000D_
  <img src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-icon.png?v=c78bd457575a">_x000D_
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</div>
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(Vertical and horizontal alignment)

Best way to generate a random float in C#

Any reason not to use Random.NextDouble and then cast to float? That will give you a float between 0 and 1.

If you want a different form of "best" you'll need to specify your requirements. Note that Random shouldn't be used for sensitive matters such as finance or security - and you should generally reuse an existing instance throughout your application, or one per thread (as Random isn't thread-safe).

EDIT: As suggested in comments, to convert this to a range of float.MinValue, float.MaxValue:

// Perform arithmetic in double type to avoid overflowing
double range = (double) float.MaxValue - (double) float.MinValue;
double sample = rng.NextDouble();
double scaled = (sample * range) + float.MinValue;
float f = (float) scaled;

EDIT: Now you've mentioned that this is for unit testing, I'm not sure it's an ideal approach. You should probably test with concrete values instead - making sure you test with samples in each of the relevant categories - infinities, NaNs, denormal numbers, very large numbers, zero, etc.

Change User Agent in UIWebView

Taking everything this is how it was solved for me:

- (void)viewDidLoad {
    NSURL *url = [NSURL URLWithString: @"http://www.amazon.com"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setValue:@"Foobar/1.0" forHTTPHeaderField:@"User-Agent"];
    [webView loadRequest:request];
}

Thanks Everyone.

ImportError: cannot import name NUMPY_MKL

If you look at the line which is causing the error, you'll see this:

from numpy._distributor_init import NUMPY_MKL  # requires numpy+mkl

This line comment states the dependency as numpy+mkl (numpy with Intel Math Kernel Library). This means that you've installed the numpy by pip, but the scipy was installed by precompiled archive, which expects numpy+mkl.

This problem can be easy solved by installation for numpy+mkl from whl file from here.

ImportError: No Module named simplejson

@noskio is correct... it just means that simplejson isn't found on your system and you need to install it for Python older than 2.6. one way is to use the setuptools easy_install tool. with it, you can install it as easily as: easy_install simplejson

UPDATE (Feb 2014): this is probably old news to many of you, but pip is a more modern tool that works in a similar way (i.e., pip install simplejson), only it can also uninstall apps.

Enable 'xp_cmdshell' SQL Server

For me, the only way on SQL 2008 R2 was this :

EXEC sp_configure 'Show Advanced Options', 1    
RECONFIGURE **WITH OVERRIDE**    
EXEC sp_configure 'xp_cmdshell', 1    
RECONFIGURE **WITH OVERRIDE**

"starting Tomcat server 7 at localhost has encountered a prob"

In Servers view double-click on Tomcat and change HTTP port in Ports section to something else. Or in Package Explorer navigate to Servers Tomcat and change Connector port part inside server.xml file.

What is the meaning of the term "thread-safe"?

Thread-safe-code works as specified, even when entered simultaneously by different threads. This often means, that internal data-structures or operations that should run uninterrupted are protected against different modifications at the same time.

How to create a JavaScript callback for knowing when an image is loaded?

Image.onload() will often work.

To use it, you'll need to be sure to bind the event handler before you set the src attribute.

Related Links:

Example Usage:

_x000D_
_x000D_ 
    window.onload = function () {_x000D_
_x000D_
        var logo = document.getElementById('sologo');_x000D_
_x000D_
        logo.onload = function () {_x000D_
            alert ("The image has loaded!");  _x000D_
        };_x000D_
_x000D_
        setTimeout(function(){_x000D_
            logo.src = 'https://edmullen.net/test/rc.jpg';         _x000D_
        }, 5000);_x000D_
    };
_x000D_ 
 <html>_x000D_
    <head>_x000D_
    <title>Image onload()</title>_x000D_
    </head>_x000D_
    <body>_x000D_
_x000D_
    <img src="#" alt="This image is going to load" id="sologo"/>_x000D_
_x000D_
    <script type="text/javascript">_x000D_
_x000D_
    </script>_x000D_
    </body>_x000D_
    </html>
_x000D_
_x000D_
_x000D_

jQuery: How to capture the TAB keypress within a Textbox

Working example in jQuery 1.9:

$('body').on('keydown', '#textbox', function(e) {
    if (e.which == 9) {
        e.preventDefault();
        // do your code
    }
});

How can I protect my .NET assemblies from decompilation?

Host your service in any cloud service provider.

Forgot Oracle username and password, how to retrieve?

  1. Open your SQL command line and type the following:

    SQL> connect / as sysdba

  2. Once connected,you can enter the following query to get details of username and password:

    SQL> select username,password from dba_users;

  3. This will list down the usernames,but passwords would not be visible.But you can identify the particular username and then change the password for that user. For changing the password,use the below query:

    SQL> alter user username identified by password;

  4. Here username is the name of user whose password you want to change and password is the new password.

MySQL: NOT LIKE

categories_posts and categories_news start with substring 'categories_' then it is enough to check that developer_configurations_cms.cfg_name_unique starts with 'categories' instead of check if it contains the given substring. Translating all that into a query:

SELECT *
    FROM developer_configurations_cms

    WHERE developer_configurations_cms.cat_id = '1'
    AND developer_configurations_cms.cfg_variables LIKE '%parent_id=2%'
    AND developer_configurations_cms.cfg_name_unique NOT LIKE 'categories%'

Show animated GIF

 
public class aiubMain {
public static void main(String args[]) throws MalformedURLException{
    //home frame = new home();
    java.net.URL imgUrl2 = home.class.getResource("Campus.gif");

Icon icon = new ImageIcon(imgUrl2);
JLabel label = new JLabel(icon);

JFrame f = new JFrame("Animation");
f.getContentPane().add(label);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}

Requery a subform from another form?

You must use the name of the subform control, not the name of the subform, though these are often the same:

 Forms![MainForm]![subform control name Name].Form.Requery

Or, if you are on the main form:

 Me.[subform control name Name].Form.Requery

More Info: http://www.mvps.org/access/forms/frm0031.htm

How do I get information about an index and table owner in Oracle?

The following helped me as I didn't have DBA access and also wanted the column names.

See: https://dataedo.com/kb/query/oracle/list-table-indexes

select ind.table_owner || '.' || ind.table_name as "TABLE",
       ind.index_name,
       LISTAGG(ind_col.column_name, ',')
            WITHIN GROUP(order by ind_col.column_position) as columns,
       ind.index_type,
       ind.uniqueness
from sys.all_indexes ind
join sys.all_ind_columns ind_col
           on ind.owner = ind_col.index_owner
           and ind.index_name = ind_col.index_name
where ind.table_owner not in ('ANONYMOUS','CTXSYS','DBSNMP','EXFSYS',
       'MDSYS', 'MGMT_VIEW','OLAPSYS','OWBSYS','ORDPLUGINS', 'ORDSYS',
       'SI_INFORMTN_SCHEMA','SYS','SYSMAN','SYSTEM', 'TSMSYS','WK_TEST',
       'WKPROXY','WMSYS','XDB','APEX_040000','APEX_040200',
       'DIP', 'FLOWS_30000','FLOWS_FILES','MDDATA', 'ORACLE_OCM', 'XS$NULL',
       'SPATIAL_CSW_ADMIN_USR', 'SPATIAL_WFS_ADMIN_USR', 'PUBLIC',
       'LBACSYS', 'OUTLN', 'WKSYS', 'APEX_PUBLIC_USER')
    -- AND ind.table_name='TableNameGoesHereIfYouWantASpecificTable'
group by ind.table_owner,
         ind.table_name,
         ind.index_name,
         ind.index_type,
         ind.uniqueness 
order by ind.table_owner,
         ind.table_name;

Combine hover and click functions (jQuery)?

 
$("#target").hover(function(){
  $(this).click();
}).click(function(){
  //common function
});

How to change Elasticsearch max memory size

In elasticsearch path home dir i.e. typically /usr/share/elasticsearch, There is a config file bin/elasticsearch.in.sh. Edit parameter ES_MIN_MEM, ES_MAX_MEM in this file to change -Xms2g, -Xmx4g respectively. And Please make sure you have restarted the node after this config change.

Send a SMS via intent

This is another solution using SMSManager:

SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage("PhoneNumber-example:+989147375410", null, "SMS Message Body", null, null);

HTML form action and onsubmit issues

Try

onsubmit="return checkRegistration()"

Eclipse Error: "Failed to connect to remote VM"

In my case i turn Windows Firewall off

1- Open Windows Firewall by clicking the Start button Picture of the Start button, and then clicking Control Panel. In the search box, type firewall, and then click Windows Firewall.

2- Click Turn Windows Firewall on or off. Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

3- Click Turn off Windows Firewall (not recommended) under each network location that you want to stop trying to protect, and then click OK. Was this page helpful?

Some times you need also

  1. To stop all Vpn client services (fortiClient ,vpn Client ...)
  2. To stop Antivirus Firewall ( exemple Kaspersky => Configuration => Anti-Hacker)

How to remove youtube branding after embedding video in web page?

You can add ?modestbranding=1 to your url. That will remove the logo.

modestbranding (supported players: AS3, HTML5)

This parameter lets you use a YouTube player that does not show a YouTube logo. Set the parameter value to 1 to prevent the YouTube logo from displaying in the control bar. Note that a small YouTube text label will still display in the upper-right corner of a paused video when the user's mouse pointer hovers over the player.

&showinfo=0 will remove the title bar.

showinfo (supported players: AS3, AS2, HTML5)

Values: 0 or 1. The parameter's default value is 1. If you set the parameter value to 0, then the player will not display information like the video title and uploader before the video starts playing.

You can find all options on the Google Developers website.

Note:

It doesn't fully remove the logo. There is still a small logo on the bottom left.

showinfo is deprecated and will be ignored after September 25, 2018: https://developers.google.com/youtube/player_parameters

Executable directory where application is running from?

 
Dim P As String = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().CodeBase)
P = New Uri(P).LocalPath

How to unzip a file in Powershell?

In PowerShell v5+, there is an Expand-Archive command (as well as Compress-Archive) built in:

Expand-Archive c:\a.zip -DestinationPath c:\a

How can I remove jenkins completely from linux

First - stop Jenkins service:

sudo service jenkins stop

Next - delete:

sudo apt-get remove --purge jenkins

If you used separate server for Jenkins, some GCP or AWS - just delete this server. Here is a video how to uninstall Jenkins from GCP Compute Engine https://youtu.be/D2HUFAc_Trw

How do I load an HTML page in a <div> using JavaScript?

You can use the jQuery : 

$("#topBar").on("click",function(){
        $("#content").load("content.html");
});

How to link to part of the same document in Markdown?

Github automatically parses anchor tags out of your headers. So you can do the following:

[Custom foo description](#foo)

# Foo

In the above case, the Foo header has generated an anchor tag with the name foo

Note: just one # for all heading sizes, no space between # and anchor name, anchor tag names must be lowercase, and delimited by dashes if multi-word.

[click on this link](#my-multi-word-header)

### My Multi Word Header

Update

Works out of the box with pandoc too.

Can I apply the required attribute to <select> fields in HTML5?

You can use the selected attribute for the option element to select a choice by default. You can use the required attribute for the select element to ensure that the user selects something.

In Javascript, you can check the selectedIndex property to get the index of the selected option, or you can check the value property to get the value of the selected option.

According to the HTML5 spec, selectedIndex "returns the index of the first selected item, if any, or -1 if there is no selected item. And value "returns the value of the first selected item, if any, or the empty string if there is no selected item." So if selectedIndex = -1, then you know they haven't selected anything.

<button type="button" onclick="displaySelection()">What did I pick?</button>
<script>
    function displaySelection()
    {
        var mySelect = document.getElementById("someSelectElement");
        var mySelection = mySelect.selectedIndex;
        alert(mySelection);
    }
</script>

Can I use multiple versions of jQuery on the same page?

Absolutely, yes you can. This link contains details about how you can achieve that: https://api.jquery.com/jquery.noconflict/.

converting epoch time with milliseconds to datetime

Use datetime.datetime.fromtimestamp:

>>> import datetime
>>> s = 1236472051807 / 1000.0
>>> datetime.datetime.fromtimestamp(s).strftime('%Y-%m-%d %H:%M:%S.%f')
'2009-03-08 09:27:31.807000'

%f directive is only supported by datetime.datetime.strftime, not by time.strftime.

UPDATE Alternative using %, str.format:

>>> import time
>>> s, ms = divmod(1236472051807, 1000)  # (1236472051, 807)
>>> '%s.%03d' % (time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(s)), ms)
'2009-03-08 00:27:31.807'
>>> '{}.{:03d}'.format(time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(s)), ms)
'2009-03-08 00:27:31.807'

Skipping every other element after the first

 
def skip_elements(elements):
  new_list = []
  for index,element in enumerate(elements):
    if index == 0:
      new_list.append(element)
    elif (index % 2) == 0: 
      new_list.append(element)
  return new_list

Also can use for loop + enumerate. elif (index % 2) == 0: ## Checking if number is even, not odd cause indexing starts from zero not 1.

How to parse a month name (string) to an integer for comparison in C#?

If you use the DateTime.ParseExact()-method that several people have suggested, you should carefully consider what you want to happen when the application runs in a non-English environment!

In Denmark, which of ParseExact("Januar", ...) and ParseExact("January", ...) should work and which should fail?

That will be the difference between CultureInfo.CurrentCulture and CultureInfo.InvariantCulture.

How to switch databases in psql?

If you want to switch to a specific database on startup, try

/Applications/Postgres.app/Contents/Versions/9.5/bin/psql vigneshdb;

By default, Postgres runs on the port 5432. If it runs on another, make sure to pass the port in the command line.

/Applications/Postgres.app/Contents/Versions/9.5/bin/psql -p2345 vigneshdb;

By a simple alias, we can make it handy.

Create an alias in your .bashrc or .bash_profile

function psql()
{
    db=vigneshdb
    if [ "$1" != ""]; then
            db=$1
    fi
    /Applications/Postgres.app/Contents/Versions/9.5/bin/psql -p5432 $1
}

Run psql in command line, it will switch to default database; psql anotherdb, it will switch to the db with the name in argument, on startup.

Bootstrap 3 collapse accordion: collapse all works but then cannot expand all while maintaining data-parent

Updated Answer

Trying to open multiple panels of a collapse control that is setup as an accordion i.e. with the data-parent attribute set, can prove quite problematic and buggy (see this question on multiple panels open after programmatically opening a panel)

Instead, the best approach would be to:

  1. Allow each panel to toggle individually
  2. Then, enforce the accordion behavior manually where appropriate.

To allow each panel to toggle individually, on the data-toggle="collapse" element, set the data-target attribute to the .collapse panel ID selector (instead of setting the data-parent attribute to the parent control. You can read more about this in the question Modify Twitter Bootstrap collapse plugin to keep accordions open.

Roughly, each panel should look like this:

<div class="panel panel-default">
   <div class="panel-heading">
         <h4 class="panel-title"
             data-toggle="collapse" 
             data-target="#collapseOne">
             Collapsible Group Item #1
         </h4>
    </div>
    <div id="collapseOne" 
         class="panel-collapse collapse">
        <div class="panel-body"></div>
    </div>
</div>

To manually enforce the accordion behavior, you can create a handler for the collapse show event which occurs just before any panels are displayed. Use this to ensure any other open panels are closed before the selected one is shown (see this answer to multiple panels open). You'll also only want the code to execute when the panels are active. To do all that, add the following code:

$('#accordion').on('show.bs.collapse', function () {
    if (active) $('#accordion .in').collapse('hide');
});

Then use show and hide to toggle the visibility of each of the panels and data-toggle to enable and disable the controls.

$('#collapse-init').click(function () {
    if (active) {
        active = false;
        $('.panel-collapse').collapse('show');
        $('.panel-title').attr('data-toggle', '');
        $(this).text('Enable accordion behavior');
    } else {
        active = true;
        $('.panel-collapse').collapse('hide');
        $('.panel-title').attr('data-toggle', 'collapse');
        $(this).text('Disable accordion behavior');
    }
});

Working demo in jsFiddle

CSS selector last row from main table

Your tables should have as immediate children just tbody and thead elements, with the rows within*. So, amend the HTML to be:

<table border="1" width="100%" id="test">
  <tbody>
    <tr>
     <td>
      <table border="1" width="100%">
        <tbody>
          <tr>
            <td>table 2</td>
          </tr>
        </tbody>
      </table>
     </td>
    </tr> 
    <tr><td>table 1</td></tr>
    <tr><td>table 1</td></tr>
    <tr><td>table 1</td></tr>
  </tbody>
</table>

Then amend your selector slightly to this:

#test > tbody > tr:last-child { background:#ff0000; }

See it in action here. That makes use of the child selector, which:

...separates two selectors and matches only those elements matched by the second selector that are direct children of elements matched by the first.

So, you are targeting only direct children of tbody elements that are themselves direct children of your #test table.

Alternative solution

The above is the neatest solution, as you don't need to over-ride any styles. The alternative would be to stick with your current set-up, and over-ride the background style for the inner table, like this:

#test tr:last-child { background:#ff0000; }
#test table tr:last-child { background:transparent; }

* It's not mandatory but most (all?) browsers will add these in, so it's best to make it explicit. As @BoltClock states in the comments:

...it's now set in stone in HTML5, so for a browser to be compliant it basically must behave this way.

How to put a link on a button with bootstrap?

Combining the above answers i find a simply solution that probably will help you too:

<button type="submit" onclick="location.href = 'your_link';">Login</button>

by just adding inline JS code you can transform a button in a link and keeping his design.

iptables block access to port 8000 except from IP address

Another alternative is;

sudo iptables -A INPUT -p tcp --dport 8000 -s ! 1.2.3.4 -j DROP

I had similar issue that 3 bridged virtualmachine just need access eachother with different combination, so I have tested this command and it works well.

Edit**

According to Fernando comment and this link exclamation mark (!) will be placed before than -s parameter:

sudo iptables -A INPUT -p tcp --dport 8000 ! -s 1.2.3.4 -j DROP

MD5 hashing in Android

this is working perfectly for me, I used this to get MD5 on LIST Array(then convert it to JSON object), but if you only need to apply it on your data. type format, replace JsonObject with yours.

Especially if you have a mismatch with python MD5 implementation use this!

private static String md5(List<AccelerationSensor> sensor) {

    Gson gson= new Gson();
    byte[] JsonObject = new byte[0];
    try {
        JsonObject = gson.toJson(sensor).getBytes("UTF-8");
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }

    MessageDigest m = null;

    try {
        m = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }

    byte[] thedigest = m.digest(JsonObject);
    String hash = String.format("%032x", new BigInteger(1, thedigest));
    return hash;


}

Understanding colors on Android (six characters)

Going off the answer from @BlondeFurious, here is some Java code to get each hexadecimal value from 100% to 0% alpha:

for (double i = 1; i >= 0; i -= 0.01) {
    i = Math.round(i * 100) / 100.0d;
    int alpha = (int) Math.round(i * 255);
    String hex = Integer.toHexString(alpha).toUpperCase();
    if (hex.length() == 1)
        hex = "0" + hex;
    int percent = (int) (i * 100);
    System.out.println(String.format("%d%% — %s", percent, hex));
}

Output:

100% — FF
99% — FC
98% — FA
97% — F7
96% — F5
95% — F2
94% — F0
93% — ED
92% — EB
91% — E8
90% — E6
89% — E3
88% — E0
87% — DE
86% — DB
85% — D9
84% — D6
83% — D4
82% — D1
81% — CF
80% — CC
79% — C9
78% — C7
77% — C4
76% — C2
75% — BF
74% — BD
73% — BA
72% — B8
71% — B5
70% — B3
69% — B0
68% — AD
67% — AB
66% — A8
65% — A6
64% — A3
63% — A1
62% — 9E
61% — 9C
60% — 99
59% — 96
58% — 94
57% — 91
56% — 8F
55% — 8C
54% — 8A
53% — 87
52% — 85
51% — 82
50% — 80
49% — 7D
48% — 7A
47% — 78
46% — 75
45% — 73
44% — 70
43% — 6E
42% — 6B
41% — 69
40% — 66
39% — 63
38% — 61
37% — 5E
36% — 5C
35% — 59
34% — 57
33% — 54
32% — 52
31% — 4F
30% — 4D
29% — 4A
28% — 47
27% — 45
26% — 42
25% — 40
24% — 3D
23% — 3B
22% — 38
21% — 36
20% — 33
19% — 30
18% — 2E
17% — 2B
16% — 29
15% — 26
14% — 24
13% — 21
12% — 1F
11% — 1C
10% — 1A
9% — 17
8% — 14
7% — 12
6% — 0F
5% — 0D
4% — 0A
3% — 08
2% — 05
1% — 03
0% — 00

A JavaScript version is below:

_x000D_
_x000D_ 
var text = document.getElementById('text');_x000D_
for (var i = 1; i >= 0; i -= 0.01) {_x000D_
    i = Math.round(i * 100) / 100;_x000D_
    var alpha = Math.round(i * 255);_x000D_
    var hex = (alpha + 0x10000).toString(16).substr(-2).toUpperCase();_x000D_
    var perc = Math.round(i * 100);_x000D_
    text.innerHTML += perc + "% — " + hex + " (" + alpha + ")</br>";_x000D_
}
_x000D_ 
<div id="text"></div>
_x000D_
_x000D_
_x000D_

You can also just Google "number to hex" where 'number' is any value between 0 and 255.

How do I insert datetime value into a SQLite database?

Read This: 1.2 Date and Time Datatype best data type to store date and time is:

TEXT best format is: yyyy-MM-dd HH:mm:ss

Then read this page; this is best explain about date and time in SQLite. I hope this help you

R command for setting working directory to source file location in Rstudio

 
dirname(rstudioapi::getActiveDocumentContext()$path)

works for me but if you don't want to use rstudioapi and you are not in a proyect, you can use the symbol ~ in your path. The symbol ~ refers to the default RStudio working directory (at least on Windows).

RStudio options

If your RStudio working directory is "D:/Documents", setwd("~/proyect1") is the same as setwd("D:/Documents/proyect1").

Once you set that, you can navigate to a subdirectory: read.csv("DATA/mydata.csv"). Is the same as read.csv("D:/Documents/proyect1/DATA/mydata.csv").

If you want to navigate to a parent folder, you can use "../". For example: read.csv("../olddata/DATA/mydata.csv") which is the same as read.csv("D:/Documents/oldata/DATA/mydata.csv")

This is the best way for me to code scripts, no matter what computer you are using.

Position absolute but relative to parent

 
#father {
   position: relative;
}

#son1 {
   position: absolute;
   top: 0;
}

#son2 {
   position: absolute;
   bottom: 0;
}

This works because position: absolute means something like "use top, right, bottom, left to position yourself in relation to the nearest ancestor who has position: absolute or position: relative."

So we make #father have position: relative, and the children have position: absolute, then use top and bottom to position the children.

How to update the constant height constraint of a UIView programmatically?

If you have a view with multiple constrains, a much easier way without having to create multiple outlets would be:

In interface builder, give each constraint you wish to modify an identifier:

enter image description here

Then in code you can modify multiple constraints like so:

for constraint in self.view.constraints {
    if constraint.identifier == "myConstraint" {
       constraint.constant = 50
    }
}
myView.layoutIfNeeded()

You can give multiple constrains the same identifier thus allowing you to group together constrains and modify all at once.

Exporting the values in List to excel

The most straightforward way (in my opinion) would be to simply put together a CSV file. If you want to get into formatting and actually writing to a *.xlsx file, there are more complicated solutions (and APIs) to do that for you.

How to change an Android app's name?

change the app string resource to your new activity

How to browse localhost on Android device?

I had similar issue but I could not resolve it using static ip address or changing firewall settings. I found a useful utility which can be configured in a minute.

We can host our local web server on cloud for free. On exposing it on cloud we get a different URL which we can use instead of localhost and access the webserver from anywhere.

The utility is ngrok https://ngrok.com/download Steps:

  1. Signup
  2. Download
  3. Extract the file and double click to run it, this will open a command prompt
  4. Type "ngrok.exe http 80" without quotes to host for example XAMPP apache server which runs on port 80.
  5. Copy the new url name generated on the cmd prompt for e.g. if it is like this "fafb42f.ngrok.io"

URL like : http://localhost/php/test.php Should be modified like this : http://fafb42f.ngrok.io/php/test.php

Now this URL can be accessed from phone.

How do I delete rows in a data frame?

The key idea is you form a set of the rows you want to remove, and keep the complement of that set.

In R, the complement of a set is given by the '-' operator.

So, assuming the data.frame is called myData:

myData[-c(2, 4, 6), ]   # notice the -

Of course, don't forget to "reassign" myData if you wanted to drop those rows entirely---otherwise, R just prints the results.

myData <- myData[-c(2, 4, 6), ]

How do I build an import library (.lib) AND a DLL in Visual C++?

OK, so I found the answer from http://binglongx.wordpress.com/2009/01/26/visual-c-does-not-generate-lib-file-for-a-dll-project/ says that this problem was caused by not exporting any symbols and further instructs on how to export symbols to create the lib file. To do so, add the following code to your .h file for your DLL.

#ifdef BARNABY_EXPORTS
#define BARNABY_API __declspec(dllexport)
#else
#define BARNABY_API __declspec(dllimport)
#endif

Where BARNABY_EXPORTS and BARNABY_API are unique definitions for your project. Then, each function you export you simply precede by:

BARNABY_API int add(){
}

This problem could have been prevented either by clicking the Export Symbols box on the new project DLL Wizard or by voting yes for lobotomies for computer programmers.

What is the difference between Hibernate and Spring Data JPA

Hibernate is a JPA implementation, while Spring Data JPA is a JPA data access abstraction. Spring Data JPA cannot work without a JPA provider.

Spring Data offers a solution to the DDD Repository pattern or the legacy GenericDao custom implementations. It can also generate JPA queries on your behalf through method name conventions.

With Spring Data, you may use Hibernate, EclipseLink, or any other JPA provider. A very interesting benefit of using Spring or Java EE is that you can control transaction boundaries declaratively using the @Transactional annotation.

Spring JDBC is much more lightweight, and it's intended for native querying, and if you only intend to use JDBC alone, then you are better off using Spring JDBC to deal with the JDBC verbosity.

Therefore, Hibernate and Spring Data are complementary rather than competitors.

How does internationalization work in JavaScript?

You can also try another library - https://github.com/wikimedia/jquery.i18n .

In addition to parameter replacement and multiple plural forms, it has support for gender a rather unique feature of custom grammar rules that some languages need.

Values of disabled inputs will not be submitted

Yes, all browsers should not submit the disabled inputs, as they are read-only.

More information (section 17.12.1)

Attribute definitions

disabled [CI] When set for a form control, this Boolean attribute disables the control for user input. When set, the disabled attribute has the following effects on an element:

  • Disabled controls do not receive focus.
  • Disabled controls are skipped in tabbing navigation.
  • Disabled controls cannot be successful.

The following elements support the disabled attribute: BUTTON, INPUT, OPTGROUP, OPTION, SELECT, and TEXTAREA.

This attribute is inherited but local declarations override the inherited value.

How disabled elements are rendered depends on the user agent. For example, some user agents "gray out" disabled menu items, button labels, etc.

In this example, the INPUT element is disabled. Therefore, it cannot receive user input nor will its value be submitted with the form.

<INPUT disabled name="fred" value="stone">

Note. The only way to modify dynamically the value of the disabled attribute is through a script.

How to shrink temp tablespace in oracle?

Oh My Goodness! Look at the size of my temporary table space! Or... how to shrink temporary tablespaces in Oracle.

Yes I ran a query to see how big my temporary tablespace is: 

SQL> SELECT tablespace_name, file_name, bytes
2  FROM dba_temp_files WHERE tablespace_name like 'TEMP%';

TABLESPACE_NAME   FILE_NAME                                 BYTES
----------------- -------------------------------- --------------
TEMP              /the/full/path/to/temp01.dbf     13,917,200,000

The first question you have to ask is why the temporary tablespace is so large. You may know the answer to this off the top of your head. It may be due to a large query that you just run with a sort that was a mistake (I have done that more than once.) It may be due to some other exceptional circumstance. If that is the case then all you need to do to clean up is to shrink the temporary tablespace and move on in life.

But what if you don't know? Before you decide to shrink you may need to do some investigation into the causes of the large tablespace. If this happens on a regular basis then it is possible that your database just needs that much space.

The dynamic performance view

V$TEMPSEG_USAGE

can be very useful in determining the cause.

Maybe you just don't care about the cause and you just need to shrink it. This is your third day on the job. The data in the database is only 200MiB if data and the temporary tablespace is 13GiB - Just shrink it and move on. If it grows again then we will look into the cause. In the mean time I am out of space on that disk volume and I just need the space back.

Let's take a look at shrinking it. It will depend a little on what version of Oracle you are running and how the temporary tablespace was set up.
Oracle will do it's best to keep you from making any horrendous mistakes so we will just try the commands and if they don't work we will shrink in a new way.

First let's try to shrink the datafile. If we can do that then we get back the space and we can worry about why it grew tomorrow.

SQL>
SQL> alter database tempfile '/the/full/path/to/temp01.dbf' resize 256M; 
alter database tempfile '/the/full/path/to/temp01.dbf' resize 256M
*   
ERROR at line 1:
ORA-03297: file contains used data beyond requested RESIZE value

Depending on the error message you may want to try this with different sizes that are smaller than the current site of the file. I have had limited success with this. Oracle will only shrink the file if the temporary tablespace is at the head of the file and if it is smaller than the size you specify. Some old Oracle documentation (they corrected this) said that you could issue the command and the error message would tell you what size you could shrink to. By the time I started working as a DBA this was not true. You just had to guess and re-run the command a bunch of times and see if it worked.

Alright. That didn't work. How about this.

SQL> alter tablespace YOUR_TEMP_TABLESPACE_NAME shrink space keep 256M;

If you are in 11g (Maybee in 10g too) this is it! If it works you may want to go back to the previous command and give it some more tries.

But what if that fails. If the temporary tablespace is the default temporary that was set up when the database was installed then you may need to do a lot more work. At this point I usually re-evaluate if I really need that space back. After all disk space only costs $X.XX a GiB. Usually I don't want to make changes like this during production hours. That means working at 2AM AGAIN! (Not that I really object to working at 2AM - it is just that... Well I like to sleep too. And my wife likes to have me at home at 2AM... not roaming the downtown streets at 4AM trying to remember where I parked my car 3 hours earlier. I have heard of that "telecommuting" thing. I just worry that I will get half way through and then my internet connectivity will fail - then I have to rush downtown to fix it all before folks show up in the morning to use the database.)

Ok... Back to the serious stuff... If the temporary tablespace you want to shrink is your default temporary tablespace, you will have to first create a new temporary tablespace, set it as the default temporary tablespace then drop your old default temporary tablespace and recreate it. Afterwords drop the second temporary table created. 

SQL> CREATE TEMPORARY TABLESPACE temp2
2  TEMPFILE '/the/full/path/to/temp2_01.dbf' SIZE 5M REUSE
3  AUTOEXTEND ON NEXT 1M MAXSIZE unlimited
4  EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;

Tablespace created.

SQL> ALTER DATABASE DEFAULT TEMPORARY TABLESPACE temp2;

Database altered.

SQL> DROP TABLESPACE temp INCLUDING CONTENTS AND DATAFILES;

Tablespace dropped.


SQL> CREATE TEMPORARY TABLESPACE temp
2  TEMPFILE '/the/full/path/to/temp01.dbf' SIZE 256M REUSE
3  AUTOEXTEND ON NEXT 128M MAXSIZE unlimited
4  EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;

Tablespace created.

SQL> ALTER DATABASE DEFAULT TEMPORARY TABLESPACE temp;

Database altered.

SQL> DROP TABLESPACE temp2 INCLUDING CONTENTS AND DATAFILES;

Tablespace dropped.

Hopefully one of these things will help!

How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

I tried everything. Reinstalling Tomcat is what finally worked. Here's what I've checked before reinstalling.

Make sure your environmental variables look like this. 

$ echo $JAVA_HOME
C:\Program Files\Java\jdk1.7.0_51\
$ echo $JRE_HOME
C:\Program Files\Java\jdk1.7.0_51\jre\bin

Make sure Eclipse is using the same jre you set JAVA_HOME to (if JAVA_HOME is not set it will look at JRE_HOME). Window > Prefrences > Java > Installed JREs (the checked one is the default one)

If you made any changes to any of your tomcat files especially catalina.bat or startup.bat, then you may be telling tomcat to look at a different version of java than the one you set to JAVA_HOME C:\Program Files (x86)\Apache\apache-tomcat-7.0.26\bin

SQL Insert Multiple Rows

We will import the CSV file into the destination table in the simplest form. I placed my sample CSV file on the C: drive and now we will create a table which we will import data from the CSV file.

DROP TABLE IF EXISTS Sales 

CREATE TABLE [dbo].[Sales](
    [Region] [varchar](50) ,
    [Country] [varchar](50) ,
    [ItemType] [varchar](50) NULL,
    [SalesChannel] [varchar](50) NULL,
    [OrderPriority] [varchar](50) NULL,
    [OrderDate]  datetime,
    [OrderID] bigint NULL,
    [ShipDate] datetime,
    [UnitsSold]  float,
    [UnitPrice] float,
    [UnitCost] float,
    [TotalRevenue] float,
    [TotalCost]  float,
    [TotalProfit] float
)

The following BULK INSERT statement imports the CSV file to the Sales table.

BULK INSERT Sales
FROM 'C:\1500000 Sales Records.csv'
WITH (FIRSTROW = 2,
    FIELDTERMINATOR = ',',
    ROWTERMINATOR='\n' );

What is the difference between Unidirectional and Bidirectional JPA and Hibernate associations?

In terms of coding, a bidirectional relationship is more complex to implement because the application is responsible for keeping both sides in synch according to JPA specification 5 (on page 42). Unfortunately the example given in the specification does not give more details, so it does not give an idea of the level of complexity.

When not using a second level cache it is usually not a problem to do not have the relationship methods correctly implemented because the instances get discarded at the end of the transaction.

When using second level cache, if anything gets corrupted because of wrongly implemented relationship handling methods, this means that other transactions will also see the corrupted elements (the second level cache is global).

A correctly implemented bi-directional relationship can make queries and the code simpler, but should not be used if it does not really make sense in terms of business logic.

How to configure heroku application DNS to Godaddy Domain?

You can't use the naked domain of your-domain.com if it is not redirected to the www.your-domain.com. Heroku use the www.yourdomain.com which act here as a subdomain. So when you follow the default instruction to use your-domain.com then you will need to assign both of them.

We can actually assign only the naked domain without the www.your-domain.com. Use only your-domain.com when the domain's dns provider (NameServers) support ALIAS or ANAME for the @ Record to example.herokuapp.com without CNAME www.your-domain.com to it.

It will let you to point www.your-domain.com to other hosting separately (independent).

How do you round a number to two decimal places in C#?

Try this:

twoDec = Math.Round(val, 2)

Validation failed for one or more entities while saving changes to SQL Server Database using Entity Framework

As an improvement to both Praveen and Tony, I use an override:

public partial class MyDatabaseEntities : DbContext
{
    public override int SaveChanges()
    {
        try
        {
            return base.SaveChanges();
        }
        catch (DbEntityValidationException dbEx)
        {
            foreach (var validationErrors in dbEx.EntityValidationErrors)
            {
                foreach (var validationError in validationErrors.ValidationErrors)
                {
                    Trace.TraceInformation("Class: {0}, Property: {1}, Error: {2}",
                        validationErrors.Entry.Entity.GetType().FullName,
                        validationError.PropertyName,
                        validationError.ErrorMessage);
                }
            }

            throw;  // You can also choose to handle the exception here...
        }
    }
}

Remove duplicate values from JS array

In ECMAScript 6 (aka ECMAScript 2015), Set can be used to filter out duplicates. Then it can be converted back to an array using the spread operator.

var names = ["Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl"],
    unique = [...new Set(names)];

How to run ssh-add on windows?

Original answer using git's start-ssh-agent

Make sure you have Git installed and have git's cmd folder in your PATH. For example, on my computer the path to git's cmd folder is C:\Program Files\Git\cmd

Make sure your id_rsa file is in the folder c:\users\yourusername\.ssh

Restart your command prompt if you haven't already, and then run start-ssh-agent. It will find your id_rsa and prompt you for the passphrase

Update 2019 - A better solution if you're using Windows 10: OpenSSH is available as part of Windows 10 which makes using SSH from cmd/powershell much easier in my opinion. It also doesn't rely on having git installed, unlike my previous solution.

  1. Open Manage optional features from the start menu and make sure you have Open SSH Client in the list. If not, you should be able to add it.

  2. Open Services from the start Menu

  3. Scroll down to OpenSSH Authentication Agent > right click > properties

  4. Change the Startup type from Disabled to any of the other 3 options. I have mine set to Automatic (Delayed Start)

  5. Open cmd and type where ssh to confirm that the top listed path is in System32. Mine is installed at C:\Windows\System32\OpenSSH\ssh.exe. If it's not in the list you may need to close and reopen cmd.

Once you've followed these steps, ssh-agent, ssh-add and all other ssh commands should now work from cmd. To start the agent you can simply type ssh-agent.

  1. Optional step/troubleshooting: If you use git, you should set the GIT_SSH environment variable to the output of where ssh which you ran before (e.g C:\Windows\System32\OpenSSH\ssh.exe). This is to stop inconsistencies between the version of ssh you're using (and your keys are added/generated with) and the version that git uses internally. This should prevent issues that are similar to this

Some nice things about this solution:

  • You won't need to start the ssh-agent every time you restart your computer
  • Identities that you've added (using ssh-add) will get automatically added after restarts. (It works for me, but you might possibly need a config file in your c:\Users\User\.ssh folder)
  • You don't need git!
  • You can register any rsa private key to the agent. The other solution will only pick up a key named id_rsa

Hope this helps

execute shell command from android

 
Process p;
StringBuffer output = new StringBuffer();
try {
    p = Runtime.getRuntime().exec(params[0]);
    BufferedReader reader = new BufferedReader(
            new InputStreamReader(p.getInputStream()));
    String line = "";
    while ((line = reader.readLine()) != null) {
        output.append(line + "\n");
        p.waitFor();
    }
} 
catch (IOException e) {
    e.printStackTrace();
} catch (InterruptedException e) {
    e.printStackTrace();
}
String response = output.toString();
return response;

When tracing out variables in the console, How to create a new line?

You need to add the new line character \n:

console.log('line one \nline two')

would display:

line one

line two

What are queues in jQuery?

To understand queue method, you have to understand how jQuery does animation. If you write multiple animate method calls one after the other, jQuery creates an 'internal' queue and adds these method calls to it. Then it runs those animate calls one by one.

Consider following code.

function nonStopAnimation()
{
    //These multiple animate calls are queued to run one after
    //the other by jQuery.
    //This is the reason that nonStopAnimation method will return immeidately
    //after queuing these calls. 
    $('#box').animate({ left: '+=500'}, 4000);
    $('#box').animate({ top: '+=500'}, 4000);
    $('#box').animate({ left: '-=500'}, 4000);

    //By calling the same function at the end of last animation, we can
    //create non stop animation. 
    $('#box').animate({ top: '-=500'}, 4000 , nonStopAnimation);
}

The 'queue'/'dequeue' method gives you control over this 'animation queue'.

By default the animation queue is named 'fx'. I have created a sample page here which has various examples which will illustrate how the queue method could be used.

http://jsbin.com/zoluge/1/edit?html,output

Code for above sample page:

$(document).ready(function() {
    $('#nonStopAnimation').click(nonStopAnimation);

    $('#stopAnimationQueue').click(function() {
        //By default all animation for particular 'selector'
        //are queued in queue named 'fx'.
        //By clearning that queue, you can stop the animation.
        $('#box').queue('fx', []);
    });

    $('#addAnimation').click(function() {
        $('#box').queue(function() {
            $(this).animate({ height : '-=25'}, 2000);
            //De-queue our newly queued function so that queues
            //can keep running.
            $(this).dequeue();
        });
    });

    $('#stopAnimation').click(function() {
        $('#box').stop();
    });

    setInterval(function() {
        $('#currentQueueLength').html(
         'Current Animation Queue Length for #box ' + 
          $('#box').queue('fx').length
        );
    }, 2000);
});

function nonStopAnimation()
{
    //These multiple animate calls are queued to run one after
    //the other by jQuery.
    $('#box').animate({ left: '+=500'}, 4000);
    $('#box').animate({ top: '+=500'}, 4000);
    $('#box').animate({ left: '-=500'}, 4000);
    $('#box').animate({ top: '-=500'}, 4000, nonStopAnimation);
}

Now you may ask, why should I bother with this queue? Normally, you wont. But if you have a complicated animation sequence which you want to control, then queue/dequeue methods are your friend.

Also see this interesting conversation on jQuery group about creating a complicated animation sequence.

http://groups.google.com/group/jquery-en/browse_thread/thread/b398ad505a9b0512/f4f3e841eab5f5a2?lnk=gst

Demo of the animation:

http://www.exfer.net/test/jquery/tabslide/

Let me know if you still have questions.

How to assign an action for UIImageView object in Swift

Swift 4 Code

Step 1 In ViewdidLoad()

   let pictureTap = UITapGestureRecognizer(target: self, action: #selector(MyInfoTableViewController.imageTapped))
       userImageView.addGestureRecognizer(pictureTap)
       userImageView.isUserInteractionEnabled = true

Step 2 Add Following Function

@objc func imageTapped() {

        let imageView = userImageView
        let newImageView = UIImageView(image: imageView?.image)
        newImageView.frame = UIScreen.main.bounds
        newImageView.backgroundColor = UIColor.black
        newImageView.contentMode = .scaleAspectFit
        newImageView.isUserInteractionEnabled = true
        let tap = UITapGestureRecognizer(target: self, action: #selector(dismissFullscreenImage))
        newImageView.addGestureRecognizer(tap)
        self.view.addSubview(newImageView)

        self.navigationController?.isNavigationBarHidden = true
        self.tabBarController?.tabBar.isHidden = true

    }

It's Tested And Working Properly

git push says "everything up-to-date" even though I have local changes

Another situation that is important to be aware of: The sort of default state for git is that you are working in the "master" branch. And for a lot of situations, you'll just hang out in that as your main working branch (although some people get fancy and do other things).

Anyway, that's just one branch. So a situation I might get into is:

My active branch is actually NOT the master branch. ... But I habitually do the command: git push (and I had previously done git push origin master, so it's a shortcut for THAT).

So I'm habitually pushing the master branch to the shared repo ... which is probably a good clean thing, in my case ...

But I have forgotten that the changes I have been working on are not yet IN the master branch !!!

So therefore everytime I try git push, and I see "Everything up to date", I want to scream, but of course, it is not git's fault! It's mine.

So instead, I merge my branch into master, and then do push, and everything is happy again.

webpack: Module not found: Error: Can't resolve (with relative path)

Had the same issue with module not found. Turns out I had a component import Picture from './Picture/Picture'; at the very bottom of all the imports. When I moved it below import React, { Component } from 'react';, it worked.

What is the default access specifier in Java?

The default visibility is known as “package-private” (though you can't use this explicitly), which means the field will be accessible from inside the same package to which the class belongs.

As mdma pointed out, it isn't true for interface members though, for which the default is "public".

See Java's Access Specifiers

How can I pull from remote Git repository and override the changes in my local repository?

Provided that the remote repository is origin, and that you're interested in master:

git fetch origin
git reset --hard origin/master

This tells it to fetch the commits from the remote repository, and position your working copy to the tip of its master branch.

All your local commits not common to the remote will be gone.

Remove x-axis label/text in chart.js

(this question is a duplicate of In chart.js, Is it possible to hide x-axis label/text of bar chart if accessing from mobile?) They added the option, 2.1.4 (and maybe a little earlier) has it

var myLineChart = new Chart(ctx, {
    type: 'line',
    data: data,
    options: {
        scales: {
            xAxes: [{
                ticks: {
                    display: false
                }
            }]
        }
    }
}

C++ String Concatenation operator<<

For string concatenation in C++, you should use the + operator. 

nametext = "Your name is" + name;

"A namespace cannot directly contain members such as fields or methods"

The snippet you're showing doesn't seem to be directly responsible for the error.

This is how you can CAUSE the error:

namespace MyNameSpace
{
   int i; <-- THIS NEEDS TO BE INSIDE THE CLASS

   class MyClass
   {
      ...
   }
}

If you don't immediately see what is "outside" the class, this may be due to misplaced or extra closing bracket(s) }.

SELECT * FROM X WHERE id IN (...) with Dapper ORM

In my experience, the most friendly way of dealing with this is to have a function that converts a string into a table of values.

There are many splitter functions available on the web, you'll easily find one for whatever if your flavour of SQL.

You can then do...

SELECT * FROM table WHERE id IN (SELECT id FROM split(@list_of_ids))

Or

SELECT * FROM table INNER JOIN (SELECT id FROM split(@list_of_ids)) AS list ON list.id = table.id

(Or similar)

The point of test %eax %eax

CMP subtracts the operands and sets the flags. Namely, it sets the zero flag if the difference is zero (operands are equal).

TEST sets the zero flag, ZF, when the result of the AND operation is zero. If two operands are equal, their bitwise AND is zero when both are zero. TEST also sets the sign flag, SF, when the most significant bit is set in the result, and the parity flag, PF, when the number of set bits is even.

JE [Jump if Equals] tests the zero flag and jumps if the flag is set. JE is an alias of JZ [Jump if Zero] so the disassembler cannot select one based on the opcode. JE is named such because the zero flag is set if the arguments to CMP are equal.

So,

TEST %eax, %eax
JE   400e77 <phase_1+0x23>

jumps if the %eax is zero.

List all of the possible goals in Maven 2?

Lets make it very simple:

Maven Lifecycles: 1. Clean 2. Default (build) 3. Site

Maven Phases of the Default Lifecycle: 1. Validate 2. Compile 3. Test 4. Package 5. Verify 6. Install 7. Deploy

Note: Don't mix or get confused with maven goals with maven lifecycle.

See Maven Build Lifecycle Basics1

SQL How to remove duplicates within select query?

You mention that there are date duplicates, but it appears they're quite unique down to the precision of seconds.

Can you clarify what precision of date you start considering dates duplicate - day, hour, minute?

In any case, you'll probably want to floor your datetime field. You didn't indicate which field is preferred when removing duplicates, so this query will prefer the last name in alphabetical order.

 SELECT MAX(owner_name), 
        --floored to the second
        dateadd(second,datediff(second,'2000-01-01',start_date),'2000-01-01') AS StartDate
 From   MyTable
 GROUP BY dateadd(second,datediff(second,'2000-01-01',start_date),'2000-01-01')

Get ID from URL with jQuery

 
var url = window.location.pathname;
var id = url.substring(url.lastIndexOf('/') + 1);

Modify a Column's Type in sqlite3

It is possible by dumping, editing and reimporting the table.

This script will do it for you (Adapt the values at the start of the script to your needs):

#!/bin/bash

DB=/tmp/synapse/homeserver.db
TABLE="public_room_list_stream"
FIELD=visibility
OLD="BOOLEAN NOT NULL"
NEW="INTEGER NOT NULL"
TMP=/tmp/sqlite_$TABLE.sql

echo "### create dump"
echo ".dump '$TABLE'" | sqlite3 "$DB" >$TMP

echo "### editing the create statement"
sed -i "s|$FIELD $OLD|$FIELD $NEW|g" $TMP

read -rsp $'Press any key to continue deleting and recreating the table $TABLE ...\n' -n1 key 

echo "### rename the original to '$TABLE"_backup"'"
sqlite3 "$DB" "PRAGMA busy_timeout=20000; ALTER TABLE '$TABLE' RENAME TO '$TABLE"_backup"'"

echo "### delete the old indexes"
for idx in $(echo "SELECT name FROM sqlite_master WHERE type == 'index' AND tbl_name LIKE '$TABLE""%';" | sqlite3 $DB); do
  echo "DROP INDEX '$idx';" | sqlite3 $DB
done

echo "### reinserting the edited table"
cat $TMP | sqlite3 $DB

file_get_contents("php://input") or $HTTP_RAW_POST_DATA, which one is better to get the body of JSON request?

file_get_contents(php://input) - gets the raw POST data and you need to use this when you write APIs and need XML/JSON/... input that cannot be decoded to $_POST by PHP some example :

send by post JSON string 

<input type="button" value= "click" onclick="fn()">
<script>
 function fn(){


    var js_obj = {plugin: 'jquery-json', version: 2.3};

    var encoded = JSON.stringify( js_obj );

var data= encoded


    $.ajax({
  type: "POST",
  url: '1.php',
  data: data,
  success: function(data){
    console.log(data);
  }

});

    }
</script>

1.php

//print_r($_POST); //empty!!! don't work ... 
var_dump( file_get_contents('php://input'));

Detect Safari using jQuery

 
//Check if Safari
  function isSafari() {
      return /^((?!chrome).)*safari/i.test(navigator.userAgent);
  }
//Check if MAC
     if(navigator.userAgent.indexOf('Mac')>1){
        alert(isSafari());
     }

http://jsfiddle.net/s1o943gb/10/

Returning an empty array

In a single line you could do:

private static File[] bar(){
    return new File[]{};
}

WPF Datagrid Get Selected Cell Value

When I faced this problem, I approached it like this: I created a DataRowView, grabbed the column index, and then used that in the row's ItemArray

DataRowView dataRow = (DataRowView)dataGrid1.SelectedItem;
int index = dataGrid1.CurrentCell.Column.DisplayIndex;
string cellValue = dataRow.Row.ItemArray[index].ToString();

How do I purge a linux mail box with huge number of emails?

alternative way:

mail -N
d *
quit

-N Inhibits the initial display of message headers when reading mail or editing a mail folder.
d * delete all mails

Ansible - Use default if a variable is not defined

Not totally related, but you can also check for both undefined AND empty (for e.g my_variable:) variable. (NOTE: only works with ansible version > 1.9, see: link)

- name: Create user
  user:
    name: "{{ ((my_variable == None) | ternary('default_value', my_variable)) \
    if my_variable is defined else 'default_value' }}"

How do I save a String to a text file using Java?

Use FileUtils.writeStringToFile() from Apache Commons IO. No need to reinvent this particular wheel.

How to figure out the SMTP server host?

Quick example:

On Ubuntu, if you are interested, for instance, in Gmail then open the Terminal and type:

nslookup -q=mx gmail.com

"Comparison method violates its general contract!"

If compareParents(s1, s2) == -1 then compareParents(s2, s1) == 1 is expected. With your code it's not always true.

Specifically if s1.getParent() == s2 && s2.getParent() == s1. It's just one of the possible problems.

convert UIImage to NSData

Try one of the following, depending on your image format:

UIImageJPEGRepresentation

Returns the data for the specified image in JPEG format.

NSData * UIImageJPEGRepresentation (
   UIImage *image,
   CGFloat compressionQuality
);

UIImagePNGRepresentation

Returns the data for the specified image in PNG format

NSData * UIImagePNGRepresentation (
   UIImage *image
);

Here the docs.

EDIT:

if you want to access the raw bytes that make up the UIImage, you could use this approach:

CGDataProviderRef provider = CGImageGetDataProvider(image.CGImage);
NSData* data = (id)CFBridgingRelease(CGDataProviderCopyData(provider));
const uint8_t* bytes = [data bytes];

This will give you the low-level representation of the image RGB pixels. (Omit the CFBridgingRelease bit if you are not using ARC).

Sending a mail from a linux shell script

Another option for in a bash script:

mailbody="Testmail via bash script"
echo "From: [email protected]" > /tmp/mailtest
echo "To: [email protected]" >> /tmp/mailtest
echo "Subject: Mailtest subject" >> /tmp/mailtest
echo "" >> /tmp/mailtest
echo $mailbody >> /tmp/mailtest
cat /tmp/mailtest | /usr/sbin/sendmail -t
  • The file /tmp/mailtest is overwritten everytime this script is used.
  • The location of sendmail may differ per system.
  • When using this in a cron script, you have to use the absolute path for the sendmail command.

What are Covering Indexes and Covered Queries in SQL Server?

If all the columns requested in the select list of query, are available in the index, then the query engine doesn't have to lookup the table again which can significantly increase the performance of the query. Since all the requested columns are available with in the index, the index is covering the query. So, the query is called a covering query and the index is a covering index.

A clustered index can always cover a query, if the columns in the select list are from the same table.

The following links can be helpful, if you are new to index concepts:

How to fix: Error device not found with ADB.exe

For me, I have to Revoke USB debugging authorizations in Developer Options. Here is the steps:

  1. Turn off USB Debugging,
  2. Revoke USB debugging authorizations,
  3. Plug the cable back in,
  4. Turn on USB Debugging

Shift column in pandas dataframe up by one?

 
In [44]: df['gdp'] = df['gdp'].shift(-1)

In [45]: df
Out[45]: 
   y  gdp  cap
0  1    3    5
1  2    7    9
2  8    4    2
3  3    7    7
4  6  NaN    7

In [46]: df[:-1]                                                                                                                                                                                                                                                                                                               
Out[46]: 
   y  gdp  cap
0  1    3    5
1  2    7    9
2  8    4    2
3  3    7    7

How do I ALTER a PostgreSQL table and make a column unique?

Or, have the DB automatically assign a constraint name using:

ALTER TABLE foo ADD UNIQUE (thecolumn);

Gem Command not found

The following command installs ruby gem for ubuntu:

apt-get install libgemplugin-ruby

I did it after ruby was installed.

Force youtube embed to start in 720p

The first example below does not work for me, but the second one does (in Chrome).

<iframe width="720" height="405" src="//www.youtube.com/embed/GX_c566xYcQ?rel=0&vq=hd1080" frameborder="0" allowfullscreen="1"></iframe>
<iframe width="720" height="405" src="//youtube.com/v/IplDUxTQxsE?rel=0&vq=hd1080" frameborder="0" allowfullscreen="1"></iframe>

I believe the first one uses the new HTML5 youtube player whereas the bottom one (which works) uses the older flash player. However, the second one doesn't seem to load correctly in Safari/Firefox etc so probably not usable.

How can I Remove .DS_Store files from a Git repository?

Combining benzado and webmat's answers, updating with git rm, not failing on files found that aren't in repo, and making it paste-able generically for any user:

# remove any existing files from the repo, skipping over ones not in repo
find . -name .DS_Store -print0 | xargs -0 git rm --ignore-unmatch
# specify a global exclusion list
git config --global core.excludesfile ~/.gitignore
# adding .DS_Store to that list
echo .DS_Store >> ~/.gitignore

How do I exit a foreach loop in C#?

Just use the statement:

break;

How to install beautiful soup 4 with python 2.7 on windows

 
easy_install BeautifulSoup4

or 

easy_install BeautifulSoup

to install easy_install 

http://pypi.python.org/pypi/setuptools#files

MIT vs GPL license

You are correct that the GPL is more restrictive than the MIT license.

You cannot include GPL code in a MIT licensed product. If you distribute a combined work that combines GPL and MIT code (except in some particular situations, e.g. 'mere aggregation'), that distribution must be compliant with the GPL.

You can include MIT licensed code in a GPL product. The whole combined work must be distributed in a way compliant with the GPL. If you have made changes to the MIT parts of the code, you would be required to publish the source for those changes if you distribute an application that contains GPL and MIT code.

If you are the copyright owner of the GPL code, you can of course choose to release that code under the MIT license instead - in that case it's your code and you can publish it under as many licenses as you want.

Passing Variable through JavaScript from one html page to another page

Without reading your code but just your scenario, I would solve by using localStorage. Here's an example, I'll use prompt() for short.

On page1: 

window.onload = function() {
   var getInput = prompt("Hey type something here: ");
   localStorage.setItem("storageName",getInput);
}

On page2: 

window.onload = alert(localStorage.getItem("storageName"));

You can also use cookies but localStorage allows much more spaces, and they aren't sent back to servers when you request pages.

How to create a batch file to run cmd as administrator

You can use a shortcut that links to the batch file. Just go into properties for the shortcut and select advanced, then "run as administrator".

Then just make the batch file hidden, and run the shortcut.

This way, you can even set your own icon for the shortcut.

Sockets - How to find out what port and address I'm assigned

The comment in your code is wrong. INADDR_ANY doesn't put server's IP automatically'. It essentially puts 0.0.0.0, for the reasons explained in mark4o's answer.

Crop image in PHP

Improved Crop image functionality in PHP on the fly. 

http://www.example.com/cropimage.php?filename=a.jpg&newxsize=100&newysize=200&constrain=1

Code in cropimage.php 

$basefilename = @basename(urldecode($_REQUEST['filename']));

$path = 'images/';
$outPath = 'crop_images/';
$saveOutput = false; // true/false ("true" if you want to save images in out put folder)
$defaultImage = 'no_img.png'; // change it with your default image

$basefilename = $basefilename;
$w = $_REQUEST['newxsize'];
$h = $_REQUEST['newysize'];

if ($basefilename == "") {
    $img = $path . $defaultImage;
    $percent = 100;
} else {
    $img = $path . $basefilename;

    $len = strlen($img);
    $ext = substr($img, $len - 3, $len);
    $img2 = substr($img, 0, $len - 3) . strtoupper($ext);
    if (!file_exists($img)) $img = $img2;
    if (file_exists($img)) {
        $percent = @$_GET['percent'];
        $constrain = @$_GET['constrain'];
        $w = $w;
        $h = $h;
    } else if (file_exists($path . $basefilename)) {
        $img = $path . $basefilename;
        $percent = $_GET['percent'];
        $constrain = $_GET['constrain'];
        $w = $w;
        $h = $h;
    } else {

        $img = $path . 'no_img.png';    // change with your default image
        $percent = @$_GET['percent'];
        $constrain = @$_GET['constrain'];
        $w = $w;
        $h = $h;

    }

}

// get image size of img
$x = @getimagesize($img);

// image width
$sw = $x[0];
// image height
$sh = $x[1];

if ($percent > 0) {
    // calculate resized height and width if percent is defined
    $percent = $percent * 0.01;
    $w = $sw * $percent;
    $h = $sh * $percent;
} else {
    if (isset ($w) AND !isset ($h)) {
        // autocompute height if only width is set
        $h = (100 / ($sw / $w)) * .01;
        $h = @round($sh * $h);
    } elseif (isset ($h) AND !isset ($w)) {
        // autocompute width if only height is set
        $w = (100 / ($sh / $h)) * .01;
        $w = @round($sw * $w);
    } elseif (isset ($h) AND isset ($w) AND isset ($constrain)) {
        // get the smaller resulting image dimension if both height
        // and width are set and $constrain is also set
        $hx = (100 / ($sw / $w)) * .01;
        $hx = @round($sh * $hx);

        $wx = (100 / ($sh / $h)) * .01;
        $wx = @round($sw * $wx);

        if ($hx < $h) {
            $h = (100 / ($sw / $w)) * .01;
            $h = @round($sh * $h);
        } else {
            $w = (100 / ($sh / $h)) * .01;
            $w = @round($sw * $w);
        }
    }
}

$im = @ImageCreateFromJPEG($img) or // Read JPEG Image
$im = @ImageCreateFromPNG($img) or // or PNG Image
$im = @ImageCreateFromGIF($img) or // or GIF Image
$im = false; // If image is not JPEG, PNG, or GIF

if (!$im) {
    // We get errors from PHP's ImageCreate functions...
    // So let's echo back the contents of the actual image.
    readfile($img);
} else {
    // Create the resized image destination
    $thumb = @ImageCreateTrueColor($w, $h);
    // Copy from image source, resize it, and paste to image destination
    @ImageCopyResampled($thumb, $im, 0, 0, 0, 0, $w, $h, $sw, $sh);

    //Other format imagepng()

    if ($saveOutput) { //Save image
        $save = $outPath . $basefilename;
        @ImageJPEG($thumb, $save);
    } else { // Output resized image
        header("Content-type: image/jpeg");
        @ImageJPEG($thumb);
    }
}

How to cut an entire line in vim and paste it?

There are several ways to cut a line, all controlled by the d key in normal mode. If you are using visual mode (the v key) you can just hit the d key once you have highlighted the region you want to cut. Move to the location you would like to paste and hit the p key to paste.

It's also worth mentioning that you can copy/cut/paste from registers. Suppose you aren't sure when or where you want to paste the text. You could save the text to up to 24 registers identified by an alphabetical letter. Just prepend your command with ' (single quote) and the register letter (a thru z). For instance you could use the visual mode (v key) to select some text and then type 'ad to cut the text and store it in register 'a'. Once you navigate to the location where you want to paste the text you would type 'ap to paste the contents of register a.

Counting Line Numbers in Eclipse

A very simple plugin for counting actual lines of source code is step counter eclipse plugin. Please download and try.

github link

Place the downloaded jar file under eclipse\plugin folder and restart eclipse.

Rightclick and select step counter enter image description here

Step Result enter image description here

Call Javascript function from URL/address bar

Using Eddy's answer worked very well as I had kind of the same problem. Just call your url with the parameters : "www.mypage.html#myAnchor"

Then, in mypage.html :

$(document).ready(function(){
  var hash = window.location.hash;
  if(hash.length > 0){
    // your action with the hash
  }
});

Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?

If you had added some native C code in your project this answer could be helpful.

I had added some native C code in android project.

Now i was trying to access that code which was returning native string to me, before processing the the string i had set its default value as nullptr. Now upon retrieving its value in java code ran into this issue.

As our native C code is out from java directory so getting no clue of exact line of code which is creating the issue. So i would suggest you to check your .cpp file and try to find any clue there.

Hope so you will get rid of the issue soon. :)

How to add column if not exists on PostgreSQL?

With Postgres 9.6 this can be done using the option if not exists

ALTER TABLE table_name ADD COLUMN IF NOT EXISTS column_name INTEGER;

JQuery wait for page to finish loading before starting the slideshow?

If you pass jQuery a function, it will not run until the page has loaded:

<script type="text/javascript">
$(function() {
    //your header rotation code goes here
});
</script>

UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 1

I was getting the same type of error, and I found that the console is not capable of displaying the string in another language. Hence I made the below code changes to set default_charset as UTF-8. 

data_head = [('\x81\xa1\x8fo\x89\xef\x82\xa2\x95\xdb\x8f\xd8\x90\xa7\x93x\x81\xcb3\x8c\x8e\x8cp\x91\xb1\x92\x86(\x81\x86\x81\xde\x81\x85)\x81\xa1\x8f\x89\x89\xf1\x88\xc8\x8aO\x81A\x82\xa8\x8b\xe0\x82\xcc\x90S\x94z\x82\xcd\x88\xea\x90\xd8\x95s\x97v\x81\xa1\x83}\x83b\x83v\x82\xcc\x82\xa8\x8e\x8e\x82\xb5\x95\xdb\x8c\xaf\x82\xc5\x8fo\x89\xef\x82\xa2\x8am\x92\xe8\x81\xa1', 'shift_jis')]
default_charset = 'UTF-8' #can also try 'ascii' or other unicode type
print ''.join([ unicode(lin[0], lin[1] or default_charset) for lin in data_head ])

Possible to change where Android Virtual Devices are saved?

You can change the .ini file for the new AVD:

target=android-7
path=C:\Users\username\.android\avd\VIRTUAL_DEVICE_NAME.avd

I don't know how to specify where the .ini file should be stored :)

How to escape double quotes in a title attribute

Using &quot; is the way to do it. I tried your second code snippet, and it works in both Firefox and Internet Explorer.

ASP.Net 2012 Unobtrusive Validation with jQuery

Add a reference to Microsoft.JScript in your application in your web.config as below :

<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.5">
      <assemblies>
        <add assembly="Microsoft.JScript, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
      </assemblies>
    </compilation>
    <httpRuntime targetFramework="4.5"/>
  </system.web>
  <appSettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="none"/>
  </appSettings>
</configuration>

How to load an ImageView by URL in Android?

I have recently found a thread here, as I have to do a similar thing for a listview with images, but the principle is simple, as you can read in the first sample class shown there (by jleedev). You get the Input stream of the image (from web)

private InputStream fetch(String urlString) throws MalformedURLException, IOException {
    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpGet request = new HttpGet(urlString);
    HttpResponse response = httpClient.execute(request);
    return response.getEntity().getContent();
}

Then you store the image as Drawable and you can pass it to the ImageView (via setImageDrawable). Again from the upper code snippet take a look at the entire thread. 

InputStream is = fetch(urlString);
Drawable drawable = Drawable.createFromStream(is, "src");

How can I find the link URL by link text with XPath?

Too late for you, but for anyone else with the same question...

//a[contains(text(), 'programming')]/@href

Of course, 'programming' can be any text fragment.

Conditional formatting based on another cell's value

One more example:

If you have Column from A to D, and need to highlight the whole line (e.g. from A to D) if B is "Complete", then you can do it following:

"Custom formula is":  =$B:$B="Completed" 
Background Color:     red 
Range:                A:D

Of course, you can change Range to A:T if you have more columns.

If B contains "Complete", use search as following: 

"Custom formula is":  =search("Completed",$B:$B) 
Background Color:     red 
Range:                A:D

How to find Google's IP address?

If all you are trying to do is find the IP address that corresponds to a domain name, like google.com, this is very easy on every machine connected to the Internet.

Simply run the ping command from any command prompt. Typing something like

ping google.com

will give you (among other things) that information.

preg_match(); - Unknown modifier '+'

Try this code:

preg_match('/[a-zA-Z]+<\/a>.$/', $lastgame, $match);
print_r($match);

Using / as a delimiter means you also need to escape it here, like so: <\/a>.

UPDATE

preg_match('/<a.*<a.*>(.*)</', $lastgame, $match);
echo'['.$match[1].']';

Might not be the best way...

fatal error LNK1104: cannot open file 'kernel32.lib'

I had a differnt problem on Windows 10 with Visual Studio 2017 but with the same effects. I think my problems came down to VS being installed onto a drive other than "C:\". I solved the problem by Reinstalling Windows 10 SDK

First I had to uninstall the Windows SDK (there were two versions installed). Then ran the executable. Once installed, ran visual studio and it worked fine.

Is it possible to use pip to install a package from a private GitHub repository?

If you want to install dependencies from a requirements file within a CI server or alike, you can do this:

git config --global credential.helper 'cache'
echo "protocol=https
host=example.com
username=${GIT_USER}
password=${GIT_PASS}
" | git credential approve
pip install -r requirements.txt

In my case, I used GIT_USER=gitlab-ci-token and GIT_PASS=${CI_JOB_TOKEN}.

This method has a clear advantage. You have a single requirements file which contains all of your dependencies.

Evaluate empty or null JSTL c tags

You can use 

    ${var == null}

alternatively.

What is memoization and how can I use it in Python?

Just wanted to add to the answers already provided, the Python decorator library has some simple yet useful implementations that can also memoize "unhashable types", unlike functools.lru_cache.

Print the data in ResultSet along with column names

For those who wanted more better version of the resultset printing as util class This was really helpful for printing resultset and does many things from a single util... thanks to Hami Torun!

In this class printResultSet uses ResultSetMetaData in a generic way have a look at it..


import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.StringJoiner;

public final class DBTablePrinter {

    /**
     * Column type category for CHAR, VARCHAR
     * and similar text columns.
     */
    public static final int CATEGORY_STRING = 1;
    /**
     * Column type category for TINYINT, SMALLINT,
     * INT and BIGINT columns.
     */
    public static final int CATEGORY_INTEGER = 2;
    /**
     * Column type category for REAL, DOUBLE,
     * and DECIMAL columns.
     */
    public static final int CATEGORY_DOUBLE = 3;
    /**
     * Column type category for date and time related columns like
     * DATE, TIME, TIMESTAMP etc.
     */
    public static final int CATEGORY_DATETIME = 4;
    /**
     * Column type category for BOOLEAN columns.
     */
    public static final int CATEGORY_BOOLEAN = 5;
    /**
     * Column type category for types for which the type name
     * will be printed instead of the content, like BLOB,
     * BINARY, ARRAY etc.
     */
    public static final int CATEGORY_OTHER = 0;
    /**
     * Default maximum number of rows to query and print.
     */
    private static final int DEFAULT_MAX_ROWS = 10;
    /**
     * Default maximum width for text columns
     * (like a VARCHAR) column.
     */
    private static final int DEFAULT_MAX_TEXT_COL_WIDTH = 150;

    /**
     * Overloaded method that prints rows from table tableName
     * to standard out using the given database connection
     * conn. Total number of rows will be limited to
     * {@link #DEFAULT_MAX_ROWS} and
     * {@link #DEFAULT_MAX_TEXT_COL_WIDTH} will be used to limit
     * the width of text columns (like a VARCHAR column).
     *
     * @param conn      Database connection object (java.sql.Connection)
     * @param tableName Name of the database table
     */
    public static void printTable(Connection conn, String tableName) {
        printTable(conn, tableName, DEFAULT_MAX_ROWS, DEFAULT_MAX_TEXT_COL_WIDTH);
    }

    /**
     * Overloaded method that prints rows from table tableName
     * to standard out using the given database connection
     * conn. Total number of rows will be limited to
     * maxRows and
     * {@link #DEFAULT_MAX_TEXT_COL_WIDTH} will be used to limit
     * the width of text columns (like a VARCHAR column).
     *
     * @param conn      Database connection object (java.sql.Connection)
     * @param tableName Name of the database table
     * @param maxRows   Number of max. rows to query and print
     */
    public static void printTable(Connection conn, String tableName, int maxRows) {
        printTable(conn, tableName, maxRows, DEFAULT_MAX_TEXT_COL_WIDTH);
    }

    /**
     * Overloaded method that prints rows from table tableName
     * to standard out using the given database connection
     * conn. Total number of rows will be limited to
     * maxRows and
     * maxStringColWidth will be used to limit
     * the width of text columns (like a VARCHAR column).
     *
     * @param conn              Database connection object (java.sql.Connection)
     * @param tableName         Name of the database table
     * @param maxRows           Number of max. rows to query and print
     * @param maxStringColWidth Max. width of text columns
     */
    public static void printTable(Connection conn, String tableName, int maxRows, int maxStringColWidth) {
        if (conn == null) {
            System.err.println("DBTablePrinter Error: No connection to database (Connection is null)!");
            return;
        }
        if (tableName == null) {
            System.err.println("DBTablePrinter Error: No table name (tableName is null)!");
            return;
        }
        if (tableName.length() == 0) {
            System.err.println("DBTablePrinter Error: Empty table name!");
            return;
        }
        if (maxRows 
     * ResultSet to standard out using {@link #DEFAULT_MAX_TEXT_COL_WIDTH}
     * to limit the width of text columns.
     *
     * @param rs The ResultSet to print
     */
    public static void printResultSet(ResultSet rs) {
        printResultSet(rs, DEFAULT_MAX_TEXT_COL_WIDTH);
    }

    /**
     * Overloaded method to print rows of a 
     * ResultSet to standard out using maxStringColWidth
     * to limit the width of text columns.
     *
     * @param rs                The ResultSet to print
     * @param maxStringColWidth Max. width of text columns
     */
    public static void printResultSet(ResultSet rs, int maxStringColWidth) {
        try {
            if (rs == null) {
                System.err.println("DBTablePrinter Error: Result set is null!");
                return;
            }
            if (rs.isClosed()) {
                System.err.println("DBTablePrinter Error: Result Set is closed!");
                return;
            }
            if (maxStringColWidth  columns = new ArrayList(columnCount);

            // List of table names. Can be more than one if it is a joined
            // table query
            List tableNames = new ArrayList(columnCount);

            // Get the columns and their meta data.
            // NOTE: columnIndex for rsmd.getXXX methods STARTS AT 1 NOT 0
            for (int i = 1; i  maxStringColWidth) {
                                value = value.substring(0, maxStringColWidth - 3) + "...";
                            }
                            break;
                    }

                    // Adjust the column width
                    c.setWidth(value.length() > c.getWidth() ? value.length() : c.getWidth());
                    c.addValue(value);
                } // END of for loop columnCount
                rowCount++;

            } // END of while (rs.next)

            /*
            At this point we have gone through meta data, get the
            columns and created all Column objects, iterated over the
            ResultSet rows, populated the column values and adjusted
            the column widths.
            We cannot start printing just yet because we have to prepare
            a row separator String.
             */

            // For the fun of it, I will use StringBuilder
            StringBuilder strToPrint = new StringBuilder();
            StringBuilder rowSeparator = new StringBuilder();

            /*
            Prepare column labels to print as well as the row separator.
            It should look something like this:
            +--------+------------+------------+-----------+  (row separator)
            | EMP_NO | BIRTH_DATE | FIRST_NAME | LAST_NAME |  (labels row)
            +--------+------------+------------+-----------+  (row separator)
             */

            // Iterate over columns
            for (Column c : columns) {
                int width = c.getWidth();

                // Center the column label
                String toPrint;
                String name = c.getLabel();
                int diff = width - name.length();

                if ((diff % 2) == 1) {
                    // diff is not divisible by 2, add 1 to width (and diff)
                    // so that we can have equal padding to the left and right
                    // of the column label.
                    width++;
                    diff++;
                    c.setWidth(width);
                }

                int paddingSize = diff / 2; // InteliJ says casting to int is redundant.

                // Cool String repeater code thanks to user102008 at stackoverflow.com

                String padding = new String(new char[paddingSize]).replace("\0", " ");

                toPrint = "| " + padding + name + padding + " ";
                // END centering the column label

                strToPrint.append(toPrint);

                rowSeparator.append("+");
                rowSeparator.append(new String(new char[width + 2]).replace("\0", "-"));
            }

            String lineSeparator = System.getProperty("line.separator");

            // Is this really necessary ??
            lineSeparator = lineSeparator == null ? "\n" : lineSeparator;

            rowSeparator.append("+").append(lineSeparator);

            strToPrint.append("|").append(lineSeparator);
            strToPrint.insert(0, rowSeparator);
            strToPrint.append(rowSeparator);

            StringJoiner sj = new StringJoiner(", ");
            for (String name : tableNames) {
                sj.add(name);
            }

            String info = "Printing " + rowCount;
            info += rowCount > 1 ? " rows from " : " row from ";
            info += tableNames.size() > 1 ? "tables " : "table ";
            info += sj.toString();

            System.out.println(info);

            // Print out the formatted column labels
            System.out.print(strToPrint.toString());

            String format;

            // Print out the rows
            for (int i = 0; i 
     * Integers should not be truncated so column widths should
     * be adjusted without a column width limit. Text columns should be
     * left justified and can be truncated to a max. column width etc...

     * 

     * See also: 
     * java.sql.Types
     *
     * @param type Generic SQL type
     * @return The category this type belongs to
     */
    private static int whichCategory(int type) {
        switch (type) {
            case Types.BIGINT:
            case Types.TINYINT:
            case Types.SMALLINT:
            case Types.INTEGER:
                return CATEGORY_INTEGER;

            case Types.REAL:
            case Types.DOUBLE:
            case Types.DECIMAL:
                return CATEGORY_DOUBLE;

            case Types.DATE:
            case Types.TIME:
            case Types.TIME_WITH_TIMEZONE:
            case Types.TIMESTAMP:
            case Types.TIMESTAMP_WITH_TIMEZONE:
                return CATEGORY_DATETIME;

            case Types.BOOLEAN:
                return CATEGORY_BOOLEAN;

            case Types.VARCHAR:
            case Types.NVARCHAR:
            case Types.LONGVARCHAR:
            case Types.LONGNVARCHAR:
            case Types.CHAR:
            case Types.NCHAR:
                return CATEGORY_STRING;

            default:
                return CATEGORY_OTHER;
        }
    }

    /**
     * Represents a database table column.
     */
    private static class Column {

        /**
         * Column label.
         */
        private String label;

        /**
         * Generic SQL type of the column as defined in
         * 
         * java.sql.Types
         * .
         */
        private int type;

        /**
         * Generic SQL type name of the column as defined in
         * 
         * java.sql.Types
         * .
         */
        private String typeName;

        /**
         * Width of the column that will be adjusted according to column label
         * and values to be printed.
         */
        private int width = 0;

        /**
         * Column values from each row of a ResultSet.
         */
        private List values = new ArrayList();

        /**
         * Flag for text justification using String.format.
         * Empty string ("") to justify right,
         * dash (-) to justify left.
         *
         * @see #justifyLeft()
         */
        private String justifyFlag = "";

        /**
         * Column type category. The columns will be categorised according
         * to their column types and specific needs to print them correctly.
         */
        private int typeCategory = 0;

        /**
         * Constructs a new Column with a column label,
         * generic SQL type and type name (as defined in
         * 
         * java.sql.Types
         * )
         *
         * @param label    Column label or name
         * @param type     Generic SQL type
         * @param typeName Generic SQL type name
         */
        public Column(String label, int type, String typeName) {
            this.label = label;
            this.type = type;
            this.typeName = typeName;
        }

        /**
         * Returns the column label
         *
         * @return Column label
         */
        public String getLabel() {
            return label;
        }

        /**
         * Returns the generic SQL type of the column
         *
         * @return Generic SQL type
         */
        public int getType() {
            return type;
        }

        /**
         * Returns the generic SQL type name of the column
         *
         * @return Generic SQL type name
         */
        public String getTypeName() {
            return typeName;
        }

        /**
         * Returns the width of the column
         *
         * @return Column width
         */
        public int getWidth() {
            return width;
        }

        /**
         * Sets the width of the column to width
         *
         * @param width Width of the column
         */
        public void setWidth(int width) {
            this.width = width;
        }

        /**
         * Adds a String representation (value)
         * of a value to this column object's {@link #values} list.
         * These values will come from each row of a
         * 
         * ResultSet
         *  of a database query.
         *
         * @param value The column value to add to {@link #values}
         */
        public void addValue(String value) {
            values.add(value);
        }

        /**
         * Returns the column value at row index i.
         * Note that the index starts at 0 so that getValue(0)
         * will get the value for this column from the first row
         * of a 
         * ResultSet.
         *
         * @param i The index of the column value to get
         * @return The String representation of the value
         */
        public String getValue(int i) {
            return values.get(i);
        }

        /**
         * Returns the value of the {@link #justifyFlag}. The column
         * values will be printed using String.format and
         * this flag will be used to right or left justify the text.
         *
         * @return The {@link #justifyFlag} of this column
         * @see #justifyLeft()
         */
        public String getJustifyFlag() {
            return justifyFlag;
        }

        /**
         * Sets {@link #justifyFlag} to "-" so that
         * the column value will be left justified when printed with
         * String.format. Typically numbers will be right
         * justified and text will be left justified.
         */
        public void justifyLeft() {
            this.justifyFlag = "-";
        }

        /**
         * Returns the generic SQL type category of the column
         *
         * @return The {@link #typeCategory} of the column
         */
        public int getTypeCategory() {
            return typeCategory;
        }

        /**
         * Sets the {@link #typeCategory} of the column
         *
         * @param typeCategory The type category
         */
        public void setTypeCategory(int typeCategory) {
            this.typeCategory = typeCategory;
        }
    }
}

This is the scala version of doing this... which will print column names and data as well in a generic way...

def printQuery(res: ResultSet): Unit = {
    val rsmd = res.getMetaData
    val columnCount = rsmd.getColumnCount
    var rowCnt = 0
    val s = StringBuilder.newBuilder
    while (res.next()) {

      s.clear()
      if (rowCnt == 0) {
        s.append("| ")
        for (i <- 1 to columnCount) {
          val name = rsmd.getColumnName(i)
          s.append(name)
          s.append("| ")
        }
        s.append("\n")
      }
      rowCnt += 1
      s.append("| ")
      for (i <- 1 to columnCount) {
        if (i > 1)
          s.append(" | ")
        s.append(res.getString(i))
      }
      s.append(" |")
      System.out.println(s)
    }
    System.out.println(s"TOTAL: $rowCnt rows")
  }

How to use std::sort to sort an array in C++

 
//sort by number
bool sortByStartNumber(Player &p1, Player &p2) {
    return p1.getStartNumber() < p2.getStartNumber();
}
//sort by string
bool sortByName(Player &p1, Player &p2) {
    string s1 = p1.getFullName();
    string s2 = p2.getFullName();
    return s1.compare(s2) == -1;
}

SQL Server - SELECT FROM stored procedure

You must read about OPENROWSET and OPENQUERY

SELECT  * 
INTO    #tmp FROM    
OPENQUERY(YOURSERVERNAME, 'EXEC MyProc @parameters')

What is the best way to update the entity in JPA

It depends on number of entities which are going to be updated, if you have large number of entities using JPA Query Update statement is better as you dont have to load all the entities from database, if you are going to update just one entity then using find and update is fine.

jQuery equivalent to Prototype array.last()

When dealing with a jQuery object, .last() will do just that, filter the matched elements to only the last one in the set.

Of course, you can wrap a native array with jQuery leading to this:

var a = [1,2,3,4];
var lastEl = $(a).last()[0];

slf4j: how to log formatted message, object array, exception

In addition to @Ceki 's answer, If you are using logback and setup a config file in your project (usually logback.xml), you can define the log to plot the stack trace as well using 

<encoder>
    <pattern>%date |%-5level| [%thread] [%file:%line] - %msg%n%ex{full}</pattern> 
</encoder>

the %ex in pattern is what makes the difference

Processing Symbol Files in Xcode

It downloads the (debug) symbols from the device, so it becomes possible to debug on devices with that specific iOS version and also to symbolicate crash reports that happened on that iOS version.

Since symbols are CPU specific, the above only works if you have imported the symbols not only for a specific iOS device but also for a specific CPU type. The currently CPU types needed are armv7 (e.g. iPhone 4, iPhone 4s), armv7s (e.g. iPhone 5) and arm64 (e.g. iPhone 5s).

So if you want to symbolicate a crash report that happened on an iPhone 5 with armv7s and only have the symbols for armv7 for that specific iOS version, Xcode won't be able to (fully) symbolicate the crash report.

GitHub authentication failing over https, returning wrong email address

GitHub's support determined the root of the issue right away: Two-factor authorization.

To use GitHub over the shell with https, create an OAuth token. As the page notes, I did have to remove my username and password credentials from Keychain but with osx-keychain in place, the token is stored as the password and things work exactly as they would over https without two-factor authorization in place.

Adding header for HttpURLConnection

Step 1: Get HttpURLConnection object

URL url = new URL(urlToConnect);
HttpURLConnection httpUrlConnection = (HttpURLConnection) url.openConnection();

Step 2: Add headers to the HttpURLConnection using setRequestProperty method.

Map<String, String> headers = new HashMap<>();

headers.put("X-CSRF-Token", "fetch");
headers.put("content-type", "application/json");

for (String headerKey : headers.keySet()) {
    httpUrlConnection.setRequestProperty(headerKey, headers.get(headerKey));
}

Reference link

Remove scrollbars from textarea

For MS IE 10 you'll probably find you need to do the following:

-ms-overflow-style: none

See the following:

https://msdn.microsoft.com/en-us/library/hh771902(v=vs.85).aspx

Get only specific attributes with from Laravel Collection

this seems to work, but not sure if it's optimized for performance or not.

$request->user()->get(['id'])->groupBy('id')->keys()->all();

output:

array:2 [
  0 => 4
  1 => 1
]

JavaFX "Location is required." even though it is in the same package

This problem can be caused by incorrect path to the FXML file.

If you're using absolute paths (my/package/views/view.fxml), you have to precede then with a slash:

getClass().getResource("/my/package/views/view.fxml")

You can use relative paths as well:

getClass().getResource("views/view.fxml")

Submit HTML form on self page

You can leave action attribute blank. The form will automatically submit itself in the same page.

<form action="">

According to the w3c specification, action attribute must be non-empty valid url in general. There is also an explanation for some situations in which the action attribute may be left empty.

The action of an element is the value of the element’s formaction attribute, if the element is a Submit Button and has such an attribute, or the value of its form owner’s action attribute, if it has one, or else the empty string.

So they both still valid and works:

<form action="">
<form action="FULL_URL_STRING_OF_CURRENT_PAGE">

If you are sure your audience is using html5 browsers, you can even omit the action attribute:

<form>

How to style readonly attribute with CSS?

 
input[readonly], input:read-only {
    /* styling info here */
}

Shoud cover all the cases for a readonly input field...

How do I link to part of a page? (hash?)

You have two options:

You can either put an anchor in your document as follows:

<a name="ref"></a>

Or else you give an id to a any HTML element:

<h1 id="ref">Heading</h1>

Then simply append the hash #ref to the URL of your link to jump to the desired reference. Example:

<a href="document.html#ref">Jump to ref in document.html</a>

How to check if there exists a process with a given pid in Python?

In Windows, you can do it in this way:

import ctypes
PROCESS_QUERY_INFROMATION = 0x1000
def checkPid(pid):
    processHandle = ctypes.windll.kernel32.OpenProcess(PROCESS_QUERY_INFROMATION, 0,pid)
    if processHandle == 0:
        return False
    else:
        ctypes.windll.kernel32.CloseHandle(processHandle)
    return True

First of all, in this code you try to get a handle for process with pid given. If the handle is valid, then close the handle for process and return True; otherwise, you return False. Documentation for OpenProcess: https://msdn.microsoft.com/en-us/library/windows/desktop/ms684320%28v=vs.85%29.aspx

Bound method error

The syntax problem is shadowing method and variable names. In the current version sort_word_list() is a method, and sorted_word_list is a variable, whereas num_words is both. Also, list.sort() modifies the list and replaces it with a sorted version; the sorted(list) function actually returns a new list.

But I suspect this indicates a design problem. What's the point of calls like 

test.parser()
test.sort_word_list()
test.num_words()

which don't do anything? You should probably just have the methods figure out whether the appropriate counting and/or sorting has been done, and, if appropriate, do the count or sort and otherwise just return something.

E.G.,

def sort_word_list(self):
   if self.sorted_word_list is not None:
      self.sorted_word_list = sorted(self.word_list)
   return self.sorted_word_list

(Alternately, you could use properties.)

Java Ordered Map

Is there an object that acts like a Map for storing and accessing key/value pairs, but can return an ordered list of keys and an ordered list of values, such that the key and value lists are in the same order?

You're looking for java.util.LinkedHashMap. You'll get a list of Map.Entry<K,V> pairs, which always get iterated in the same order. That order is the same as the order by which you put the items in. Alternatively, use the java.util.SortedMap, where the keys must either have a natural ordering or have it specified by a Comparator.

How to create JSON Object using String?

In contrast to what the accepted answer proposes, the documentation says that for JSONArray() you must use put(value) no add(value).

https://developer.android.com/reference/org/json/JSONArray.html#put(java.lang.Object)

(Android API 19-27. Kotlin 1.2.50)

SUM of grouped COUNT in SQL Query

Please run as below :

Select sum(count) 
  from (select Name, 
               count(Name) as Count 
          from YourTable
      group by Name);  -- 6

How to handle ETIMEDOUT error?

In case if you are using node js, then this could be the possible solution

const express = require("express");
const app = express();
const server = app.listen(8080);
server.keepAliveTimeout = 61 * 1000;

https://medium.com/hk01-tech/running-eks-in-production-for-2-years-the-kubernetes-journey-at-hk01-68130e603d76

Rails 3 execute custom sql query without a model

How about this :

@client = TinyTds::Client.new(
      :adapter => 'mysql2',
      :host => 'host',
      :database => 'siteconfig_development',
      :username => 'username',
      :password => 'password'

sql = "SELECT * FROM users"

result = @client.execute(sql)

results.each do |row|
puts row[0]
end

You need to have TinyTds gem installed, since you didn't specify it in your question I didn't use Active Record

Chrome:The website uses HSTS. Network errors...this page will probably work later

I encounter same error, and incognito mode also has same issue. I resolve this issue by clear Chrome history.

How do I create a Bash alias?

I think it's proper way:

1) Go to teminal. open ~/.bashrc. Add if not exists

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

2) open ~/.bash_aliases. If not exists: touch ~/.bash_aliases && open ~/.bash_aliases

3) To add new alias rather
- edit .bash_aliases file and restart terminal or print source ~/.bash_aliases
- print echo "alias clr='clear'" >> ~/.bash_aliases && source ~/.bash_aliases where your alias is alias clr='clear'.

4) Add line source ~/.bash_aliases to ~/.bash_profile file. It needs to load aliases in each init of terminal.

Convert 24 Hour time to 12 Hour plus AM/PM indication Oracle SQL

For the 24-hour time, you need to use HH24 instead of HH.

For the 12-hour time, the AM/PM indicator is written as A.M. (if you want periods in the result) or AM (if you don't). For example:

SELECT invoice_date,
       TO_CHAR(invoice_date, 'DD-MM-YYYY HH24:MI:SS') "Date 24Hr",
       TO_CHAR(invoice_date, 'DD-MM-YYYY HH:MI:SS AM') "Date 12Hr"
  FROM invoices
;

For more information on the format models you can use with TO_CHAR on a date, see http://docs.oracle.com/cd/E16655_01/server.121/e17750/ch4datetime.htm#NLSPG004.

How to remove extension from string (only real extension!)

This works when there is multiple parts to an extension and is both short and efficient:

function removeExt($path)
{
    $basename = basename($path);
    return strpos($basename, '.') === false ? $path : substr($path, 0, - strlen($basename) + strlen(explode('.', $basename)[0]));
}

echo removeExt('https://example.com/file.php');
// https://example.com/file
echo removeExt('https://example.com/file.tar.gz');
// https://example.com/file
echo removeExt('file.tar.gz');
// file
echo removeExt('file');
// file

JPanel setBackground(Color.BLACK) does nothing

In order to completely set the background to a given color :

1) set first the background color

2) call method "Clear(0,0,this.getWidth(),this.getHeight())" (width and height of the component paint area)

I think it is the basic procedure to set the background... I've had the same problem.

Another usefull hint : if you want to draw BUT NOT in a specific zone (something like a mask or a "hole"), call the setClip() method of the graphics with the "hole" shape (any shape) and then call the Clear() method (background should previously be set to the "hole" color).

You can make more complicated clip zones by calling method clip() (any times you want) AFTER calling method setClip() to have intersections of clipping shapes.

I didn't find any method for unions or inversions of clip zones, only intersections, too bad...

Hope it helps

ValueError: shape mismatch: objects cannot be broadcast to a single shape

This particular error implies that one of the variables being used in the arithmetic on the line has a shape incompatible with another on the same line (i.e., both different and non-scalar). Since n and the output of np.add.reduce() are both scalars, this implies that the problem lies with xm and ym, the two of which are simply your x and y inputs minus their respective means.

Based on this, my guess is that your x and y inputs have different shapes from one another, making them incompatible for element-wise multiplication.

** Technically, it's not that variables on the same line have incompatible shapes. The only problem is when two variables being added, multiplied, etc., have incompatible shapes, whether the variables are temporary (e.g., function output) or not. Two variables with different shapes on the same line are fine as long as something else corrects the issue before the mathematical expression is evaluated.

What is the purpose of mvnw and mvnw.cmd files?

Command mvnw uses Maven that is by default downloaded to ~/.m2/wrapper on the first use.

URL with Maven is specified in each project at .mvn/wrapper/maven-wrapper.properties:

distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.3.9/apache-maven-3.3.9-bin.zip

To update or change Maven version invoke the following (remember about --non-recursive for multi-module projects):

./mvnw io.takari:maven:wrapper -Dmaven=3.3.9

or just modify .mvn/wrapper/maven-wrapper.properties manually.

To generate wrapper from scratch using Maven (you need to have it already in PATH run:

mvn io.takari:maven:wrapper -Dmaven=3.3.9

How to set MimeBodyPart ContentType to "text/html"?

Don't know why (the method is not documented), but by looking at the source code, this line should do it :

mime_body_part.setHeader("Content-Type", "text/html");

NPM vs. Bower vs. Browserify vs. Gulp vs. Grunt vs. Webpack

OK, they all have got some similarities, they do the same things for you in different and similar ways, I divide them in 3 main groups as below:

1) Module bundlers

webpack and browserify as popular ones, work like task runners but with more flexibility, aslo it will bundle everything together as your setting, so you can point to the result as bundle.js for example in one single file including the CSS and Javascript, for more details of each, look at the details below:

webpack

webpack is a module bundler for modern JavaScript applications. When webpack processes your application, it recursively builds a dependency graph that includes every module your application needs, then packages all of those modules into a small number of bundles - often only one - to be loaded by the browser.

It is incredibly configurable, but to get started you only need to understand Four Core Concepts: entry, output, loaders, and plugins.

This document is intended to give a high-level overview of these concepts, while providing links to detailed concept specific use-cases.

more here

browserify

Browserify is a development tool that allows us to write node.js-style modules that compile for use in the browser. Just like node, we write our modules in separate files, exporting external methods and properties using the module.exports and exports variables. We can even require other modules using the require function, and if we omit the relative path it’ll resolve to the module in the node_modules directory.

more here

2) Task runners

gulp and grunt are task runners, basically what they do, creating tasks and run them whenever you want, for example you install a plugin to minify your CSS and then run it each time to do minifying, more details about each:

gulp

gulp.js is an open-source JavaScript toolkit by Fractal Innovations and the open source community at GitHub, used as a streaming build system in front-end web development. It is a task runner built on Node.js and Node Package Manager (npm), used for automation of time-consuming and repetitive tasks involved in web development like minification, concatenation, cache busting, unit testing, linting, optimization etc. gulp uses a code-over-configuration approach to define its tasks and relies on its small, single-purposed plugins to carry them out. gulp ecosystem has 1000+ such plugins made available to choose from.

more here

grunt

Grunt is a JavaScript task runner, a tool used to automatically perform frequently used tasks such as minification, compilation, unit testing, linting, etc. It uses a command-line interface to run custom tasks defined in a file (known as a Gruntfile). Grunt was created by Ben Alman and is written in Node.js. It is distributed via npm. Presently, there are more than five thousand plugins available in the Grunt ecosystem.

more here

3) Package managers

package managers, what they do is managing plugins you need in your application and install them for you through github etc using package.json, very handy to update you modules, install them and sharing your app across, more details for each:

npm

npm is a package manager for the JavaScript programming language. It is the default package manager for the JavaScript runtime environment Node.js. It consists of a command line client, also called npm, and an online database of public packages, called the npm registry. The registry is accessed via the client, and the available packages can be browsed and searched via the npm website.

more here

bower

Bower can manage components that contain HTML, CSS, JavaScript, fonts or even image files. Bower doesn’t concatenate or minify code or do anything else - it just installs the right versions of the packages you need and their dependencies. To get started, Bower works by fetching and installing packages from all over, taking care of hunting, finding, downloading, and saving the stuff you’re looking for. Bower keeps track of these packages in a manifest file, bower.json.

more here

and the most recent package manager that shouldn't be missed, it's young and fast in real work environment compare to npm which I was mostly using before, for reinstalling modules, it do double checks the node_modules folder to check the existence of the module, also seems installing the modules takes less time:

yarn

Yarn is a package manager for your code. It allows you to use and share code with other developers from around the world. Yarn does this quickly, securely, and reliably so you don’t ever have to worry.

Yarn allows you to use other developers’ solutions to different problems, making it easier for you to develop your software. If you have problems, you can report issues or contribute back, and when the problem is fixed, you can use Yarn to keep it all up to date.

Code is shared through something called a package (sometimes referred to as a module). A package contains all the code being shared as well as a package.json file which describes the package.

more here

How to mute an html5 video player using jQuery

If you don't want to jQuery, here's the vanilla JavaScript:

///Mute
var video = document.getElementById("your-video-id");
video.muted= true;

//Unmute
var video = document.getElementById("your-video-id");
video.muted= false;

It will work for audio too, just put the element's id and it will work (and change the var name if you want, to 'media' or something suited for both audio/video as you like).

How to resolve "local edit, incoming delete upon update" message

Short version:

$ svn st
!  +  C foo
      >   local edit, incoming delete upon update
!  +  C bar
      >   local edit, incoming delete upon update
$ touch foo bar
$ svn revert foo bar
$ rm foo bar

If the conflict is about directories instead of files then replace touch with mkdir and rm with rm -r.

Note: the same procedure also work for the following situation:

$ svn st
!     C foo
      >   local delete, incoming delete upon update
!     C bar
      >   local delete, incoming delete upon update

Long version:

This happens when you edit a file while someone else deleted the file and commited first. As a good svn citizen you do an update before a commit. Now you have a conflict. Realising that deleting the file is the right thing to do you delete the file from your working copy. Instead of being content svn now complains that the local files are missing and that there is a conflicting update which ultimately wants to see the files deleted. Good job svn.

Should svn resolve not work, for whatever reason, you can do the following:

Initial situation: Local files are missing, update is conflicting.

$ svn st
!  +  C foo
      >   local edit, incoming delete upon update
!  +  C bar
      >   local edit, incoming delete upon update

Recreate the conflicting files:

$ touch foo bar

If the conflict is about directories then replace touch with mkdir.

New situation: Local files to be added to the repository (yeah right, svn, whatever you say), update still conflicting.

$ svn st
A  +  C foo
      >   local edit, incoming delete upon update
A  +  C bar
      >   local edit, incoming delete upon update

Revert the files to the state svn likes them (that means deleted):

$ svn revert foo bar

New situation: Local files not known to svn, update no longer conflicting.

$ svn st
?       foo
?       bar

Now we can delete the files:

$ rm foo bar

If the conflict is about directories then replace rm with rm -r.

svn no longer complains:

$ svn st

Done.

How to add "class" to host element?

Here's how I did it (Angular 7):

In the component, add an input: 

@Input() componentClass: string = '';

Then in the component's HTML template add something like:

<div [ngClass]="componentClass">...</div>

And finally in the HTML template where you instance the component:

<root componentClass="someclass someotherclass">...</root>

Disclaimer: I'm fairly new to Angular, so I might be just getting lucky here!

Can a website detect when you are using Selenium with chromedriver?

Write an html page with the following code. You will see that in the DOM selenium applies a webdriver attribute in the outerHTML

_x000D_
_x000D_ 
<html>_x000D_
<head>_x000D_
  <script type="text/javascript">_x000D_
  <!--_x000D_
    function showWindow(){_x000D_
      javascript:(alert(document.documentElement.outerHTML));_x000D_
    }_x000D_
  //-->_x000D_
  </script>_x000D_
</head>_x000D_
<body>_x000D_
  <form>_x000D_
    <input type="button" value="Show outerHTML" onclick="showWindow()">_x000D_
  </form>_x000D_
</body>_x000D_
</html>
_x000D_
_x000D_
_x000D_

undefined offset PHP error

Undefined offset error in PHP is Like 'ArrayIndexOutOfBoundException' in Java.

example:

<?php
$arr=array('Hello','world');//(0=>Hello,1=>world)
echo $arr[2];
?>

error: Undefined offset 2

It means you're referring to an array key that doesn't exist. "Offset" refers to the integer key of a numeric array, and "index" refers to the string key of an associative array.

Clone contents of a GitHub repository (without the folder itself)

to clone git repo into the current and empty folder (no git init) and if you do not use ssh:

git clone https://github.com/accountName/repoName.git .

Submit form using AJAX and jQuery

This is what ended up working.

$("select").change(function(){
    $.get("/page.html?" + $(this).parent("form").find(":input").serialize()); 
});

How to wait till the response comes from the $http request, in angularjs?

FYI, this is using Angularfire so it may vary a bit for a different service or other use but should solve the same isse $http has. I had this same issue only solution that fit for me the best was to combine all services/factories into a single promise on the scope. On each route/view that needed these services/etc to be loaded I put any functions that require loaded data inside the controller function i.e. myfunct() and the main app.js on run after auth i put 

myservice.$loaded().then(function() {$rootScope.myservice = myservice;});

and in the view I just did

ng-if="myservice" ng-init="somevar=myfunct()"

in the first/parent view element/wrapper so the controller can run everything inside

myfunct()

without worrying about async promises/order/queue issues. I hope that helps someone with the same issues I had.

Debugging Spring configuration

If you use Spring Boot, you can also enable a “debug” mode by starting your application with a --debug flag.

java -jar myapp.jar --debug

You can also specify debug=true in your application.properties.

When the debug mode is enabled, a selection of core loggers (embedded container, Hibernate, and Spring Boot) are configured to output more information. Enabling the debug mode does not configure your application to log all messages with DEBUG level.

Alternatively, you can enable a “trace” mode by starting your application with a --trace flag (or trace=true in your application.properties). Doing so enables trace logging for a selection of core loggers (embedded container, Hibernate schema generation, and the whole Spring portfolio).

https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-logging.html

Are loops really faster in reverse?

It used to be said that --i was faster (in C++) because there is only one result, the decremented value. i-- needs to store the decremented value back to i and also retain the original value as the result (j = i--;). In most compilers this used up two registers rather than one which could cause another variable to have to be written to memory rather than retained as a register variable.

I agree with those others that have said it makes no difference these days.

Pass by pointer & Pass by reference

A reference is semantically the following:

T& <=> *(T * const)

const T& <=> *(T const * const)

T&& <=> [no C equivalent] (C++11)

As with other answers, the following from the C++ FAQ is the one-line answer: references when possible, pointers when needed.

An advantage over pointers is that you need explicit casting in order to pass NULL. It's still possible, though. Of the compilers I've tested, none emit a warning for the following:

int* p() {
    return 0;
}
void x(int& y) {
  y = 1;
}
int main() {
   x(*p());
}

u'\ufeff' in Python string

The Unicode character U+FEFF is the byte order mark, or BOM, and is used to tell the difference between big- and little-endian UTF-16 encoding. If you decode the web page using the right codec, Python will remove it for you. Examples:

#!python2
#coding: utf8
u = u'ABC'
e8 = u.encode('utf-8')        # encode without BOM
e8s = u.encode('utf-8-sig')   # encode with BOM
e16 = u.encode('utf-16')      # encode with BOM
e16le = u.encode('utf-16le')  # encode without BOM
e16be = u.encode('utf-16be')  # encode without BOM
print 'utf-8     %r' % e8
print 'utf-8-sig %r' % e8s
print 'utf-16    %r' % e16
print 'utf-16le  %r' % e16le
print 'utf-16be  %r' % e16be
print
print 'utf-8  w/ BOM decoded with utf-8     %r' % e8s.decode('utf-8')
print 'utf-8  w/ BOM decoded with utf-8-sig %r' % e8s.decode('utf-8-sig')
print 'utf-16 w/ BOM decoded with utf-16    %r' % e16.decode('utf-16')
print 'utf-16 w/ BOM decoded with utf-16le  %r' % e16.decode('utf-16le')

Note that EF BB BF is a UTF-8-encoded BOM. It is not required for UTF-8, but serves only as a signature (usually on Windows).

Output:

utf-8     'ABC'
utf-8-sig '\xef\xbb\xbfABC'
utf-16    '\xff\xfeA\x00B\x00C\x00'    # Adds BOM and encodes using native processor endian-ness.
utf-16le  'A\x00B\x00C\x00'
utf-16be  '\x00A\x00B\x00C'

utf-8  w/ BOM decoded with utf-8     u'\ufeffABC'    # doesn't remove BOM if present.
utf-8  w/ BOM decoded with utf-8-sig u'ABC'          # removes BOM if present.
utf-16 w/ BOM decoded with utf-16    u'ABC'          # *requires* BOM to be present.
utf-16 w/ BOM decoded with utf-16le  u'\ufeffABC'    # doesn't remove BOM if present.

Note that the utf-16 codec requires BOM to be present, or Python won't know if the data is big- or little-endian.