Adding machineKey to web.config on web-farm sites

Make sure to learn from the padding oracle asp.net vulnerability that just happened (you applied the patch, right? ...) and use protected sections to encrypt the machine key and any other sensitive configuration.

An alternative option is to set it in the machine level web.config, so its not even in the web site folder.

To generate it do it just like the linked article in David's answer.

Having links relative to root?

A root-relative URL starts with a / character, to look something like <a href="/directoryInRoot/fileName.html">link text</a>.

The link you posted: <a href="fruits/index.html">Back to Fruits List</a> is linking to an html file located in a directory named fruits, the directory being in the same directory as the html page in which this link appears.

To make it a root-relative URL, change it to:

<a href="/fruits/index.html">Back to Fruits List</a>

Edited in response to question, in comments, from OP:

So doing / will make it relative to www.example.com, is there a way to specify what the root is, e.g what if i want the root to be www.example.com/fruits in www.example.com/fruits/apples/apple.html?

Yes, prefacing the URL, in the href or src attributes, with a / will make the path relative to the root directory. For example, given the html page at www.example.com/fruits/apples.html, the a of href="/vegetables/carrots.html" will link to the page www.example.com/vegetables/carrots.html.

The base tag element allows you to specify the base-uri for that page (though the base tag would have to be added to every page in which it was necessary for to use a specific base, for this I'll simply cite the W3's example:

For example, given the following BASE declaration and A declaration:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<HTML>
 <HEAD>
   <TITLE>Our Products</TITLE>
   <BASE href="http://www.aviary.com/products/intro.html">
 </HEAD>

 <BODY>
   <P>Have you seen our <A href="../cages/birds.gif">Bird Cages</A>?
 </BODY>
</HTML>

the relative URI "../cages/birds.gif" would resolve to:

http://www.aviary.com/cages/birds.gif

Example quoted from: http://www.w3.org/TR/html401/struct/links.html#h-12.4.

Razor MVC Populating Javascript array with Model Array

JSON syntax is pretty much the JavaScript syntax for coding your object. Therefore, in terms of conciseness and speed, your own answer is the best bet.

I use this approach when populating dropdown lists in my KnockoutJS model. E.g.

var desktopGrpViewModel = {
    availableComputeOfferings: ko.observableArray(@Html.Raw(JsonConvert.SerializeObject(ViewBag.ComputeOfferings))),
    desktopGrpComputeOfferingSelected: ko.observable(),
};
ko.applyBindings(desktopGrpViewModel);

...

<select name="ComputeOffering" class="form-control valid" id="ComputeOffering" data-val="true" 
data-bind="options: availableComputeOffering,
           optionsText: 'Name',
           optionsValue: 'Id',
           value: desktopGrpComputeOfferingSelect,
           optionsCaption: 'Choose...'">
</select>

Note that I'm using Json.NET NuGet package for serialization and the ViewBag to pass data.

SQL Server: use CASE with LIKE

One of the first things you need to learn about SQL (and relational databases) is that you shouldn't store multiple values in a single field.

You should create another table and store one value per row.

This will make your querying easier, and your database structure better.

select 
    case when exists (select countryname from itemcountries where yourtable.id=itemcountries.id and countryname = @country) then 'national' else 'regional' end
from yourtable

Angular 4 Pipe Filter

Pipes in Angular 2+ are a great way to transform and format data right from your templates.

Pipes allow us to change data inside of a template; i.e. filtering, ordering, formatting dates, numbers, currencies, etc. A quick example is you can transfer a string to lowercase by applying a simple filter in the template code.

List of Built-in Pipes from API List ^Examples

{{ user.name | uppercase }}

Example of Angular version 4.4.7. ng version

Custom Pipes which accepts multiple arguments.

HTML « *ngFor="let student of students | jsonFilterBy:[searchText, 'name'] "
TS   « transform(json: any[], args: any[]) : any[] { ... }

Filtering the content using a Pipe « json-filter-by.pipe.ts

import { Pipe, PipeTransform, Injectable } from '@angular/core';

@Pipe({ name: 'jsonFilterBy' })
@Injectable()
export class JsonFilterByPipe implements PipeTransform {

  transform(json: any[], args: any[]) : any[] {
    var searchText = args[0];
    var jsonKey = args[1];

    // json = undefined, args = (2) [undefined, "name"]
    if(searchText == null || searchText == 'undefined') return json;
    if(jsonKey    == null || jsonKey    == 'undefined') return json;

    // Copy all objects of original array into new Array.
    var returnObjects = json;
    json.forEach( function ( filterObjectEntery ) {

      if( filterObjectEntery.hasOwnProperty( jsonKey ) ) {
        console.log('Search key is available in JSON object.');

        if ( typeof filterObjectEntery[jsonKey] != "undefined" && 
        filterObjectEntery[jsonKey].toLowerCase().indexOf(searchText.toLowerCase()) > -1 ) {
            // object value contains the user provided text.
        } else {
            // object didn't match a filter value so remove it from array via filter
            returnObjects = returnObjects.filter(obj => obj !== filterObjectEntery);
        }
      } else {
        console.log('Search key is not available in JSON object.');
      }

    })
    return returnObjects;
  }
}

Add to @NgModule « Add JsonFilterByPipe to your declarations list in your module; if you forget to do this you'll get an error no provider for jsonFilterBy. If you add to module then it is available to all the component's of that module.

@NgModule({
  imports: [
    CommonModule,
    RouterModule,
    FormsModule, ReactiveFormsModule,
  ],
  providers: [ StudentDetailsService ],
  declarations: [
    UsersComponent, UserComponent,

    JsonFilterByPipe,
  ],
  exports : [UsersComponent, UserComponent]
})
export class UsersModule {
    // ...
}

File Name: users.component.ts and StudentDetailsService is created from this link.

import { MyStudents } from './../../services/student/my-students';
import { Component, OnInit, OnDestroy } from '@angular/core';
import { StudentDetailsService } from '../../services/student/student-details.service';

@Component({
  selector: 'app-users',
  templateUrl: './users.component.html',
  styleUrls: [ './users.component.css' ],

  providers:[StudentDetailsService]
})
export class UsersComponent implements OnInit, OnDestroy  {

  students: MyStudents[];
  selectedStudent: MyStudents;

  constructor(private studentService: StudentDetailsService) { }

  ngOnInit(): void {
    this.loadAllUsers();
  }
  ngOnDestroy(): void {
    // ONDestroy to prevent memory leaks
  }

  loadAllUsers(): void {
    this.studentService.getStudentsList().then(students => this.students = students);
  }

  onSelect(student: MyStudents): void {
    this.selectedStudent = student;
  }

}

File Name: users.component.html

<div>
    <br />
    <div class="form-group">
        <div class="col-md-6" >
            Filter by Name: 
            <input type="text" [(ngModel)]="searchText" 
                   class="form-control" placeholder="Search By Category" />
        </div>
    </div>

    <h2>Present are Students</h2>
    <ul class="students">
    <li *ngFor="let student of students | jsonFilterBy:[searchText, 'name'] " >
        <a *ngIf="student" routerLink="/users/update/{{student.id}}">
            <span class="badge">{{student.id}}</span> {{student.name | uppercase}}
        </a>
    </li>
    </ul>
</div>

In Excel, how do I extract last four letters of a ten letter string?

No need to use a macro. Supposing your first string is in A1.

=RIGHT(A1, 4)

Drag this down and you will get your four last characters.

Edit: To be sure, if you ever have sequences like 'ABC DEF' and want the last four LETTERS and not CHARACTERS you might want to use trimspaces()

=RIGHT(TRIMSPACES(A1), 4)

Edit: As per brettdj's suggestion, you may want to check that your string is actually 4-character long or more:

=IF(TRIMSPACES(A1)>=4, RIGHT(TRIMSPACES(A1), 4), TRIMSPACES(A1))

What design patterns are used in Spring framework?

Factory Method patter: BeanFactory for creating instance of an object Singleton : instance type can be singleton for a context Prototype : instance type can be prototype. Builder pattern: you can also define a method in a class who will be responsible for creating complex instance.

Force re-download of release dependency using Maven

When you added it to X, you should have incremented X's version number i.e X-1.2
Then X-1.2 should have been installed/deployed and you should have changed your projects dependency on X to be dependent on the new version X-1.2

How can I find last row that contains data in a specific column?

Sub test()
    MsgBox Worksheets("sheet_name").Range("A65536").End(xlUp).Row
End Sub

This is looking for a value in column A because of "A65536".

How to create a connection string in asp.net c#

Demo :

<connectionStrings>
<add name="myConnectionString" connectionString="server=localhost;database=myDb;uid=myUser;password=myPass;" />
</connectionStrings>

Based on your question:

<connectionStrings>
    <add name="itmall" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=D:\19-02\ABCC\App_Data\abcc.mdf;Integrated Security=True;User Instance=True" />
    </connectionStrings>

Refer links:

http://www.connectionstrings.com/store-connection-string-in-webconfig/

Retrive connection string from web.config file:

write the below code in your file where you want;

string connstring=ConfigurationManager.ConnectionStrings["itmall"].ConnectionString;

SqlConnection con = new SqlConnection(connstring);

or you can go in your way like

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["itmall"].ConnectionString);

Note:

The "name" which you gave in web.config file and name which you used in connection string must be same(like "itmall" in this solution.)

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

If you're wondering why this optimization was added to range.__contains__, and why it wasn't added to xrange.__contains__ in 2.7:

First, as Ashwini Chaudhary discovered, issue 1766304 was opened explicitly to optimize [x]range.__contains__. A patch for this was accepted and checked in for 3.2, but not backported to 2.7 because "xrange has behaved like this for such a long time that I don't see what it buys us to commit the patch this late." (2.7 was nearly out at that point.)

Meanwhile:

Originally, xrange was a not-quite-sequence object. As the 3.1 docs say:

Range objects have very little behavior: they only support indexing, iteration, and the len function.

This wasn't quite true; an xrange object actually supported a few other things that come automatically with indexing and len,^* including __contains__ (via linear search). But nobody thought it was worth making them full sequences at the time.

Then, as part of implementing the Abstract Base Classes PEP, it was important to figure out which builtin types should be marked as implementing which ABCs, and xrange/range claimed to implement collections.Sequence, even though it still only handled the same "very little behavior". Nobody noticed that problem until issue 9213. The patch for that issue not only added index and count to 3.2's range, it also re-worked the optimized __contains__ (which shares the same math with index, and is directly used by count).^** This change went in for 3.2 as well, and was not backported to 2.x, because "it's a bugfix that adds new methods". (At this point, 2.7 was already past rc status.)

So, there were two chances to get this optimization backported to 2.7, but they were both rejected.

_{* In fact, you even get iteration for free with indexing alone, but in 2.3 xrange objects got a custom iterator.}

_{** The first version actually reimplemented it, and got the details wrong—e.g., it would give you MyIntSubclass(2) in range(5) == False. But Daniel Stutzbach's updated version of the patch restored most of the previous code, including the fallback to the generic, slow _PySequence_IterSearch that pre-3.2 range.__contains__ was implicitly using when the optimization doesn't apply.}

PyCharm error: 'No Module' when trying to import own module (python script)

The answer that worked for me was indeed what OP mentions in his 2015 update: uncheck these two boxes in your Python run config:

"Add content roots to PYTHONPATH"
"Add source roots to PYTHONPATH"

I already had the run config set to use the proper venv, so PyCharm doing additional work to add things to the path was not necessary. Instead it was causing errors.

How to convert date into this 'yyyy-MM-dd' format in angular 2

You can also try this.

consider today's date '28 Dec 2018'(for example)

 this.date = new Date().toISOString().slice(0,10);

new Date() we get as: Fri Dec 28 2018 11:44:33 GMT+0530 (India Standard Time)

toISOString will convert to : 2018-12-28T06:15:27.479Z

slice(0,10) we get only first 10 characters as date which contains yyyy-mm-dd : 2018-12-28.

Why do I need to configure the SQL dialect of a data source?

A dialect is a form of the language that is spoken by a particular group of people.

Here, in context of hibernate framework, When hibernate wants to talk(using queries) with the database it uses dialects.

The SQL dialect's are derived from the Structured Query Language which uses human-readable expressions to define query statements.
A hibernate dialect gives information to the framework of how to convert hibernate queries(HQL) into native SQL queries.

The dialect of hibernate can be configured using below property:

hibernate.dialect

Here, is a complete list of hibernate dialects.

Note: The dialect property of hibernate is not mandatory.

The zip() function in Python 3

The zip() function in Python 3 returns an iterator. That is the reason why when you print test1 you get - <zip object at 0x1007a06c8>. From documentation -

Make an iterator that aggregates elements from each of the iterables.

But once you do - list(test1) - you have exhausted the iterator. So after that anytime you do list(test1) would only result in empty list.

In case of test2, you have already created the list once, test2 is a list, and hence it will always be that list.

Angular 4: no component factory found,did you add it to @NgModule.entryComponents?

Add that component to entryComponents in @NgModule of your app's module:

entryComponents:[ConfirmComponent],

as well as Declarations:

declarations: [
    AppComponent,
    ConfirmComponent
]

How do I run a file on localhost?

Think of it this way.

Anything that you type after localhost/ is the path inside the root directory of your server(www or htdocs).

You don't need to specify the complete path of the file you want to run but just the path after the root folder because putting localhost/ takes you inside the root folder itself.

Get table column names in MySQL?

It's also interesting to note that you can use
EXPLAIN table_name which is synonymous with DESCRIBE table_name and SHOW COLUMNS FROM table_name although EXPLAIN is more commonly used to obtain information about the query execution plan.

How to connect to a remote MySQL database with Java?

On Ubuntu, after creating localhost and '%' versions of the user, and granting appropriate access to database.tables for both, I had to comment out the 'bind-address' in /etc/mysql/mysql.conf.d/mysql.cnf and restart mysql as sudo.

bind-address = 127.0.0.1

Problems with installation of Google App Engine SDK for php in OS X

It's likely that the download was corrupted if you are getting an error with the disk image. Go back to the downloads page at https://developers.google.com/appengine/downloads and look at the SHA1 checksum. Then, go to your Terminal app on your mac and run the following:

openssl sha1 [put the full path to the file here without brackets]

For example:

openssl sha1 /Users/me/Desktop/myFile.dmg

If you get a different value than the one on the Downloads page, you know your file is not properly downloaded and you should try again.

C/C++ include header file order

I don't think there's a recommended order, as long as it compiles! What's annoying is when some headers require other headers to be included first... That's a problem with the headers themselves, not with the order of includes.

My personal preference is to go from local to global, each subsection in alphabetical order, i.e.:

h file corresponding to this cpp file (if applicable)
headers from the same component,
headers from other components,
system headers.

My rationale for 1. is that it should prove that each header (for which there is a cpp) can be #included without prerequisites (terminus technicus: header is "self-contained"). And the rest just seems to flow logically from there.

How to change color of the back arrow in the new material theme?

You can achieve it through code. Obtain the back arrow drawable, modify its color with a filter, and set it as back button.

final Drawable upArrow = getResources().getDrawable(R.drawable.abc_ic_ab_back_mtrl_am_alpha);
upArrow.setColorFilter(getResources().getColor(R.color.grey), PorterDuff.Mode.SRC_ATOP);
getSupportActionBar().setHomeAsUpIndicator(upArrow);

Revision 1:

Starting from API 23 (Marshmallow) the drawable resource abc_ic_ab_back_mtrl_am_alpha is changed to abc_ic_ab_back_material.

EDIT:

You can use this code to achieve the results you want:

toolbar.getNavigationIcon().setColorFilter(getResources().getColor(R.color.blue_gray_15), PorterDuff.Mode.SRC_ATOP);

How to customize the back button on ActionBar

I did the below code onCreate() and worked with me

getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_yourindicator);

Must JDBC Resultsets and Statements be closed separately although the Connection is closed afterwards?

What you have done is perfect and very good practice.

The reason I say its good practice... For example, if for some reason you are using a "primitive" type of database pooling and you call connection.close(), the connection will be returned to the pool and the ResultSet/Statement will never be closed and then you will run into many different new problems!

So you can't always count on connection.close() to clean up.

I hope this helps :)

One line ftp server in python

I dont know about a one-line FTP server, but if you do

python -m SimpleHTTPServer

It'll run an HTTP server on 0.0.0.0:8000, serving files out of the current directory. If you're looking for a way to quickly get files off a linux box with a web browser, you cant beat it.

Spark : how to run spark file from spark shell

You can use either sbt or maven to compile spark programs. Simply add the spark as dependency to maven

<repository>
      <id>Spark repository</id>
      <url>http://www.sparkjava.com/nexus/content/repositories/spark/</url>
</repository>

And then the dependency:

<dependency>
      <groupId>spark</groupId>
      <artifactId>spark</artifactId>
      <version>1.2.0</version>
</dependency>

In terms of running a file with spark commands: you can simply do this:

echo"
   import org.apache.spark.sql.*
   ssc = new SQLContext(sc)
   ssc.sql("select * from mytable").collect
" > spark.input

Now run the commands script:

cat spark.input | spark-shell

Determining image file size + dimensions via Javascript?

Service workers have access to header informations, including the Content-Length header.

Service workers are a bit complicated to understand, so I've built a small library called sw-get-headers.

Than you need to:

subscribe to the library's response event
identify the image's url among all the network requests
here you go, you can read the Content-Length header!

Note that your website needs to be on HTTPS to use Service Workers, the browser needs to be compatible with Service Workers and the images must be on the same origin as your page.

What version of javac built my jar?

A jar is merely a container. It is a file archive a la tar. While a jar may have interesting information contained within it's META-INF hierarchy, it has no obligation to specify the vintage of the classes within it's contents. For that, one must examine the class files therein.

As as Peter Lawrey mentioned in comment to the original question, you can't necessarily know which JDK release built a given class file, but you can find out the byte code class version of the class file contained in a jar.

Yes, this kinda sucks, but the first step is to extract one or more classes from the jar. For example:

$ jar xf log4j-1.2.15.jar

On Linux, Mac OS X or Windows with Cygwin installed, the file(1) command knows the class version.

$ file ./org/apache/log4j/Appender.class
./org/apache/log4j/Appender.class: compiled Java class data, version 45.3

Or alternatively, using javap from the JDK as @jikes.thunderbolt aptly points out:

$ javap -v ./org/apache/log4j/Appender.class | grep major
 major version: 45

For Windows environments without either file or grep

> javap -v ./org/apache/log4j/Appender.class | findstr major
 major version: 45

FWIW, I will concur that javap will tell a whole lot more about a given class file than the original question asked.

Anyway, a different class version, for example:

$ file ~/bin/classes/P.class
/home/dave/bin/classes/P.class: compiled Java class data, version 50.0

The class version major number corresponds to the following Java JDK versions:

45.3 = Java 1.1
46 = Java 1.2
47 = Java 1.3
48 = Java 1.4
49 = Java 5
50 = Java 6
51 = Java 7
52 = Java 8
53 = Java 9
54 = Java 10
55 = Java 11
56 = Java 12
57 = Java 13
58 = Java 14

Show git diff on file in staging area

You can also use git diff HEAD file to show the diff for a specific file.

See the EXAMPLE section under git-diff(1)

ArrayBuffer to base64 encoded string

By my side, using Chrome navigator, I had to use DataView() to read an arrayBuffer

function _arrayBufferToBase64( tabU8A ) {
var binary = '';
let lecteur_de_donnees = new DataView(tabU8A);
var len = lecteur_de_donnees.byteLength;
var chaine = '';
var pos1;
for (var i = 0; i < len; i++) {
    binary += String.fromCharCode( lecteur_de_donnees.getUint8( i ) );
}
chaine = window.btoa( binary )
return chaine;}

No suitable records were found verify your bundle identifier is correct

Chek your app ID in the Apple Developer Center. Then, use exactly the same name in Bundler Identifier.

How to save data file into .RData?

There are three ways to save objects from your R session:

Saving all objects in your R session:

The save.image() function will save all objects currently in your R session:

save.image(file="1.RData")

These objects can then be loaded back into a new R session using the load() function:

load(file="1.RData")

Saving some objects in your R session:

If you want to save some, but not all objects, you can use the save() function:

save(city, country, file="1.RData")

Again, these can be reloaded into another R session using the load() function:

load(file="1.RData")

Saving a single object

If you want to save a single object you can use the saveRDS() function:

saveRDS(city, file="city.rds")
saveRDS(country, file="country.rds")

You can load these into your R session using the readRDS() function, but you will need to assign the result into a the desired variable:

city <- readRDS("city.rds")
country <- readRDS("country.rds")

But this also means you can give these objects new variable names if needed (i.e. if those variables already exist in your new R session but contain different objects):

city_list <- readRDS("city.rds")
country_vector <- readRDS("country.rds")

Fit image to table cell [Pure HTML]

It's all about display: block :)

Updated:

Ok so you have the table, tr and td tags:

<table>
  <tr>
    <td>
      <!-- your image goes here -->
    </td>
  </tr>
</table>

Lets say your table or td (whatever define your width) has property width: 360px;. Now, when you try to replace the html comment with the actual image and set that image property for example width: 100%; which should fully fill out the td cell you will face the problem.

The problem is that your table cell (td) isn't properly filled with the image. You'll notice the space at the bottom of the cell which your image doesn't cover (it's like 5px of padding).

How to solve this in a simpliest way?

You are working with the tables, right? You just need to add the display property to your image so that it has the following:

img {
  width: 100%;
  display: block;
}

How display only years in input Bootstrap Datepicker?

$("#year").datepicker( {
    format: "yyyy",
    viewMode: "years", 
    minViewMode: "years"
}).on('changeDate', function(e){
    $(this).datepicker('hide');
});

How to use zIndex in react-native

UPDATE: Supposedly, zIndex has been added to the react-native library. I've been trying to get it to work without success. Check here for details of the fix.

Center a H1 tag inside a DIV

You can add line-height:51px to #AlertDiv h1 if you know it's only ever going to be one line. Also add text-align:center to #AlertDiv.

#AlertDiv {
    top:198px;
    left:365px;
    width:62px;
    height:51px;
    color:white;
    position:absolute;
    text-align:center;
    background-color:black;
}

#AlertDiv h1 {
    margin:auto;
    line-height:51px;
    vertical-align:middle;
}

The demo below also uses negative margins to keep the #AlertDiv centered on both axis, even when the window is resized.

Demo: jsfiddle.net/KaXY5

OrderBy descending in Lambda expression?

Try this:

List<int> list = new List<int>();
list.Add(1);
list.Add(5);
list.Add(4);
list.Add(3);
list.Add(2);

foreach (var item in list.OrderByDescending(x => x))
{
    Console.WriteLine(item);                
}

Javascript add method to object

This all depends on how you're creating Foo, and how you intend to use .bar().

First, are you using a constructor-function for your object?

var myFoo = new Foo();

If so, then you can extend the Foo function's prototype property with .bar, like so:

function Foo () { /*...*/ }
Foo.prototype.bar = function () { /*...*/ };

var myFoo = new Foo();
myFoo.bar();

In this fashion, each instance of Foo now has access to the SAME instance of .bar.
To wit: .bar will have FULL access to this, but will have absolutely no access to variables within the constructor function:

function Foo () { var secret = 38; this.name = "Bob"; }
Foo.prototype.bar = function () { console.log(secret); };
Foo.prototype.otherFunc = function () { console.log(this.name); };

var myFoo = new Foo();
myFoo.otherFunc(); // "Bob";
myFoo.bar(); // error -- `secret` is undefined...
             // ...or a value of `secret` in a higher/global scope

In another way, you could define a function to return any object (not this), with .bar created as a property of that object:

function giveMeObj () {
    var private = 42,
        privateBar = function () { console.log(private); },
        public_interface = {
            bar : privateBar
        };

    return public_interface;
}

var myObj = giveMeObj();
myObj.bar(); // 42

In this fashion, you have a function which creates new objects.
Each of those objects has a .bar function created for them.
Each .bar function has access, through what is called closure, to the "private" variables within the function that returned their particular object.
Each .bar still has access to this as well, as this, when you call the function like myObj.bar(); will always refer to myObj (public_interface, in my example Foo).

The downside to this format is that if you are going to create millions of these objects, that's also millions of copies of .bar, which will eat into memory.

You could also do this inside of a constructor function, setting this.bar = function () {}; inside of the constructor -- again, upside would be closure-access to private variables in the constructor and downside would be increased memory requirements.

So the first question is:
Do you expect your methods to have access to read/modify "private" data, which can't be accessed through the object itself (through this or myObj.X)?

and the second question is: Are you making enough of these objects so that memory is going to be a big concern, if you give them each their own personal function, instead of giving them one to share?

For example, if you gave every triangle and every texture their own .draw function in a high-end 3D game, that might be overkill, and it would likely affect framerate in such a delicate system...

If, however, you're looking to create 5 scrollbars per page, and you want each one to be able to set its position and keep track of if it's being dragged, without letting every other application have access to read/set those same things, then there's really no reason to be scared that 5 extra functions are going to kill your app, assuming that it might already be 10,000 lines long (or more).

Select subset of columns in data.table R

You can do

dt[, !c("V1","V2","V3","V5")]

to get

            V4         V6         V7        V8         V9        V10
 1: 0.88612076 0.94727825 0.50502208 0.6702523 0.24186706 0.96263313
 2: 0.11121752 0.13969145 0.19092645 0.9589867 0.27968190 0.07796870
 3: 0.50179822 0.10641301 0.08540322 0.3297847 0.03643195 0.18082180
 4: 0.09787517 0.07312777 0.88077548 0.3218041 0.75826099 0.55847774
 5: 0.73475574 0.96644484 0.58261312 0.9921499 0.78962675 0.04976212
 6: 0.88861117 0.85690337 0.27723130 0.3662264 0.50881663 0.67402625
 7: 0.33933983 0.83392047 0.30701697 0.6138122 0.85107176 0.58609504
 8: 0.89907094 0.61389815 0.19957386 0.3968331 0.78876682 0.90546328
 9: 0.54136123 0.08274569 0.25190790 0.1920462 0.15142604 0.12134807
10: 0.36511064 0.88117171 0.05730210 0.9441072 0.40125023 0.62828674

How do you compare structs for equality in C?

if the 2 structures variable are initialied with calloc or they are set with 0 by memset so you can compare your 2 structures with memcmp and there is no worry about structure garbage and this will allow you to earn time

Looping Over Result Sets in MySQL

Something like this should do the trick (However, read after the snippet for more info)

CREATE PROCEDURE GetFilteredData()
BEGIN
  DECLARE bDone INT;

  DECLARE var1 CHAR(16);    -- or approriate type
  DECLARE Var2 INT;
  DECLARE Var3 VARCHAR(50);

  DECLARE curs CURSOR FOR  SELECT something FROM somewhere WHERE some stuff;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET bDone = 1;

  DROP TEMPORARY TABLE IF EXISTS tblResults;
  CREATE TEMPORARY TABLE IF NOT EXISTS tblResults  (
    --Fld1 type,
    --Fld2 type,
    --...
  );

  OPEN curs;

  SET bDone = 0;
  REPEAT
    FETCH curs INTO var1,, b;

    IF whatever_filtering_desired
       -- here for whatever_transformation_may_be_desired
       INSERT INTO tblResults VALUES (var1, var2, var3 ...);
    END IF;
  UNTIL bDone END REPEAT;

  CLOSE curs;
  SELECT * FROM tblResults;
END

A few things to consider...

Concerning the snippet above:

may want to pass part of the query to the Stored Procedure, maybe particularly the search criteria, to make it more generic.
If this method is to be called by multiple sessions etc. may want to pass a Session ID of sort to create a unique temporary table name (actually unnecessary concern since different sessions do not share the same temporary file namespace; see comment by Gruber, below)
A few parts such as the variable declarations, the SELECT query etc. need to be properly specified

More generally: trying to avoid needing a cursor.

I purposely named the cursor variable curs[e], because cursors are a mixed blessing. They can help us implement complicated business rules that may be difficult to express in the declarative form of SQL, but it then brings us to use the procedural (imperative) form of SQL, which is a general feature of SQL which is neither very friendly/expressive, programming-wise, and often less efficient performance-wise.

Maybe you can look into expressing the transformation and filtering desired in the context of a "plain" (declarative) SQL query.

Bootstrap Carousel Full Screen

This is how I did it. This makes the images in the slideshow take up the full screen if it´s aspect ratio allows it, othervice it scales down.

.carousel {
    height: 100vh;
    width: 100%;
    overflow:hidden;
}
.carousel .carousel-inner {
    height:100%;    
}

To allways get a full screen slideshow, no matter screen aspect ratio, you can also use object-fit: (doesn´t work in IE or Edge)

.carousel .carousel-inner img {
    display:block;
    object-fit: cover;
}

How to enter newline character in Oracle?

begin   
   dbms_output.put_line( 'hello' ||chr(13) || chr(10) || 'world' );
end;

How can I align text directly beneath an image?

This centers the "A" below the image:

<div style="text-align:center">
  <asp:Image ID="Image1" runat="server" ImageUrl="~/Images/opentoselect.gif" />
  <br />
  A
</div>

That is ASP.Net and it would render the HTML as:

<div style="text-align:center">
<img id="Image1" src="Images/opentoselect.gif" style="border-width:0px;" />
<br />
A
</div>

Use Toast inside Fragment

When making a toast in fragment do as following:

Toast.makeText(getActivity(),"Message", Toast.LENGTH_SHORT).show();

When class is extending fragment it is necessary to use getActivity() since fragment is a subclass of activity.

Cheerse

Map implementation with duplicate keys

just to be complete, Apache Commons Collections also has a MultiMap. The downside of course is that Apache Commons does not use Generics.

Identifying Exception Type in a handler Catch Block

UPDATED: assuming C# 6, the chances are that your case can be expressed as an exception filter. This is the ideal approach from a performance perspective assuming your requirement can be expressed in terms of it, e.g.:

try
{
}
catch ( Web2PDFException ex ) when ( ex.Code == 52 )
{
}

Assuming C# < 6, the most efficient is to catch a specific Exception type and do handling based on that. Any catch-all handling can be done separately

try
{
}
catch ( Web2PDFException ex )
{
}

try
{
}
catch ( Web2PDFException ex )
{
}
catch ( Exception ex )
{
}

or (if you need to write a general handler - which is generally a bad idea, but if you're sure it's best for you, you're sure):

 if( err is Web2PDFException)
 {
 }

or (in certain cases if you need to do some more complex type hierarchy stuff that cant be expressed with is)

 if( err.GetType().IsAssignableFrom(typeof(Web2PDFException)))
 {
 }

~~or switch to VB.NET or F# and use is or Type.IsAssignableFrom in Exception Filters~~

ASP.net vs PHP (What to choose)

This is impossible to answer and has been brought up many many times before. Do a search, read those threads, then pick the framework you and your team have experience with.

How to pass an array into a SQL Server stored procedure

Use a table-valued parameter for your stored procedure.

When you pass it in from C# you'll add the parameter with the data type of SqlDb.Structured.

See here: http://msdn.microsoft.com/en-us/library/bb675163.aspx

Example:

// Assumes connection is an open SqlConnection object.
using (connection)
{
// Create a DataTable with the modified rows.
DataTable addedCategories =
  CategoriesDataTable.GetChanges(DataRowState.Added);

// Configure the SqlCommand and SqlParameter.
SqlCommand insertCommand = new SqlCommand(
    "usp_InsertCategories", connection);
insertCommand.CommandType = CommandType.StoredProcedure;
SqlParameter tvpParam = insertCommand.Parameters.AddWithValue(
    "@tvpNewCategories", addedCategories);
tvpParam.SqlDbType = SqlDbType.Structured;

// Execute the command.
insertCommand.ExecuteNonQuery();
}

Resetting MySQL Root Password with XAMPP on Localhost

Steps:

Open your phpMyadmin dashboard
go to user accounts
on the user section Get the root user and click [ Edit privileges ]
in the top section you will find change password button [ click on it ]
make a good pass and fill 2 pass field .
now hit the Go button.

7 . now open your xampp dir ( c:/xampp ) --> 8 . to phpMyadmin dir [C:\xampp\phpMyAdmin]

open [ config.inc.php ] file with any text editor

10 .find [ $cfg['Servers'][$i]['auth_type'] = 'config'; ]line and replace 'config' to ‘cookie’

go to [ $cfg['Servers'][$i]['AllowNoPassword'] = true; ] this line change ‘true’ to ‘false’.

last : save the file .

here is a video link in case you want to see it in Action [ click Here ]

git still shows files as modified after adding to .gitignore

Simply add git rm -r --cached <folder_name/file_name>

Sometimes, you update the .gitignore file after the commit command of files. So, the files get cached in the memory. To remove the cached files, use the above command.

Remove Item from ArrayList

You can remove elements from ArrayList using ListIterator,

ListIterator listIterator = List_Of_Array.listIterator();

 /* Use void remove() method of ListIterator to remove an element from List.
     It removes the last element returned by next or previous methods.
 */
listIterator.next();

//remove element returned by last next method
listIterator.remove();//remove element at 1st position
listIterator.next();
listIterator.next();
listIterator.remove();//remove element at 3rd position
listIterator.next();
listIterator.next();
listIterator.remove();//remove element at 5th position

What is the basic difference between the Factory and Abstract Factory Design Patterns?

I think we can understand the difference between these two by seeing a Java8 example code:

  interface Something{}

  interface OneWhoCanProvideSomething {
     Something getSomething();
  }

  interface OneWhoCanProvideCreatorsOfSomething{
     OneWhoCanProvideSomething getCreator();
  }


public class AbstractFactoryExample {

    public static void main(String[] args) {
        //I need something
        //Let's create one
        Something something = new Something() {};

        //Or ask someone (FACTORY pattern)
        OneWhoCanProvideSomething oneWhoCanProvideSomethingOfTypeA = () -> null;
        OneWhoCanProvideSomething oneWhoCanProvideSomethingOfTypeB = () -> null;

        //Or ask someone who knows soemone who can create something (ABSTRACT FACTORY pattern)
        OneWhoCanProvideCreatorsOfSomething oneWhoCanProvideCreatorsOfSomething = () -> null;

        //Same thing, but you don't need to write you own interfaces
        Supplier<Something> supplierOfSomething = () -> null;
        Supplier<Supplier<Something>> supplierOfSupplier = () -> null;
    }

}

Now the question is which way of creation should you use and why: The first way (no pattern, just plain constructor): creating by yourself is not a good idea, you have to do all the work, and your client code is tied to the particular implementation.

The second way (using Factory pattern): provides you the benefit that you can pass any type of implementation, which can provide different type of something based on some condition (maybe a parameter passed to creational method).

The third way (using Abstract Factory pattern): This gives you more flexibility. You can find different types of creators of something based on some condition (maybe a parameter passed).

Note that you can always get away with Factory pattern by combining two conditions together (which slightly increases code complexity, and coupling), I guess that's why we rarely see real life use cases of Abstract Factory pattern.

UTF-8 all the way through

I'd like to add one thing to chazomaticus' excellent answer:

Don't forget the META tag either (like this, or the HTML4 or XHTML version of it):

<meta charset="utf-8">

That seems trivial, but IE7 has given me problems with that before.

I was doing everything right; the database, database connection and Content-Type HTTP header were all set to UTF-8, and it worked fine in all other browsers, but Internet Explorer still insisted on using the "Western European" encoding.

It turned out the page was missing the META tag. Adding that solved the problem.

Edit:

The W3C actually has a rather large section dedicated to I18N. They have a number of articles related to this issue – describing the HTTP, (X)HTML and CSS side of things:

They recommend using both the HTTP header and HTML meta tag (or XML declaration in case of XHTML served as XML).

Can we rely on String.isEmpty for checking null condition on a String in Java?

Use StringUtils.isEmpty instead, it will also check for null.

Examples are:

 StringUtils.isEmpty(null)      = true
 StringUtils.isEmpty("")        = true
 StringUtils.isEmpty(" ")       = false
 StringUtils.isEmpty("bob")     = false
 StringUtils.isEmpty("  bob  ") = false

See more on official Documentation on String Utils.

Run a single migration file

If you want to run a specific migration, do

$ rake db:migrate:up VERSION=20080906120000

If you want to run migrations multiple times, do

# use the STEP parameter if you need to go more than one version back
$ rake db:migrate:redo STEP=3

If you want to run a single migration multiple times, do

# this is super useful
$ rake db:migrate:redo VERSION=20080906120000

(you can find the version number in the filename of your migration)

Edit: You can also simply rename your migration file, Eg:

20151013131830_my_migration.rb -> 20151013131831_my_migration.rb

Then migrate normally, this will treat the migration as a new one (usefull if you want to migrate on a remote environment (such as staging) on which you have less control.

Edit 2: You can also just nuke the migration entry in the database. Eg:

rails_c> q = "delete from schema_migrations where version = '20151013131830'"
rails_c> ActiveRecord::Base.connection.execute(q)

rake db:migrate will then rerun the up method of the nuked migrations.

Error: free(): invalid next size (fast):

I encountered such a situation where code was circumventing STL's api and writing to the array unsafely when someone resizes it. Adding the assert here caught it:

void Logo::add(const QVector3D &v, const QVector3D &n)
{
 GLfloat *p = m_data.data() + m_count;
 *p++ = v.x();
 *p++ = v.y();
 *p++ = v.z();
 *p++ = n.x();
 *p++ = n.y();
 *p++ = n.z();
 m_count += 6;
 Q_ASSERT( m_count <= m_data.size() );
}

How to pass arguments to addEventListener listener function?

I was stuck in this as I was using it in a loop for finding elements and adding listner to it. If you're using it in a loop, then this will work perfectly

for (var i = 0; i < states_array.length; i++) {
     var link = document.getElementById('apply_'+states_array[i].state_id);
     link.my_id = i;
     link.addEventListener('click', function(e) {   
        alert(e.target.my_id);        
        some_function(states_array[e.target.my_id].css_url);
     });
}

Android camera android.hardware.Camera deprecated

 if ( getActivity().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {

          CameraManager cameraManager=(CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);


           try {
               String cameraId = cameraManager.getCameraIdList()[0];
               cameraManager.setTorchMode(cameraId,true);
           } catch (CameraAccessException e) {
               e.printStackTrace();
           }


 }

Combine multiple Collections into a single logical Collection?

If you're using at least Java 8, see my other answer.

If you're already using Google Guava, see Sean Patrick Floyd's answer.

If you're stuck at Java 7 and don't want to include Google Guava, you can write your own (read-only) Iterables.concat() using no more than Iterable and Iterator:

Constant number

public static <E> Iterable<E> concat(final Iterable<? extends E> iterable1,
                                     final Iterable<? extends E> iterable2) {
    return new Iterable<E>() {
        @Override
        public Iterator<E> iterator() {
            return new Iterator<E>() {
                final Iterator<? extends E> iterator1 = iterable1.iterator();
                final Iterator<? extends E> iterator2 = iterable2.iterator();

                @Override
                public boolean hasNext() {
                    return iterator1.hasNext() || iterator2.hasNext();
                }

                @Override
                public E next() {
                    return iterator1.hasNext() ? iterator1.next() : iterator2.next();
                }
            };
        }
    };
}

Variable number

@SafeVarargs
public static <E> Iterable<E> concat(final Iterable<? extends E>... iterables) {
    return concat(Arrays.asList(iterables));
}

public static <E> Iterable<E> concat(final Iterable<Iterable<? extends E>> iterables) {
    return new Iterable<E>() {
        final Iterator<Iterable<? extends E>> iterablesIterator = iterables.iterator();

        @Override
        public Iterator<E> iterator() {
            return !iterablesIterator.hasNext() ? Collections.emptyIterator()
                                                : new Iterator<E>() {
                Iterator<? extends E> iterableIterator = nextIterator();

                @Override
                public boolean hasNext() {
                    return iterableIterator.hasNext();
                }

                @Override
                public E next() {
                    final E next = iterableIterator.next();
                    findNext();
                    return next;
                }

                Iterator<? extends E> nextIterator() {
                    return iterablesIterator.next().iterator();
                }

                Iterator<E> findNext() {
                    while (!iterableIterator.hasNext()) {
                        if (!iterablesIterator.hasNext()) {
                            break;
                        }
                        iterableIterator = nextIterator();
                    }
                    return this;
                }
            }.findNext();
        }
    };
}

How to search all loaded scripts in Chrome Developer Tools?

Open a new Search pane in Developer Tools by:

pressing Ctrl+Shift+F (Cmd+Option+I on mac)
clicking the overflow menu (?) in DevTools,
clicking the overflow menu in the Console (?) and choosing the Search option

You can search across all your scripts with support for regular expressions and case sensitivity.

Click any match to load that file/section in the scripts panel.

Search all files - results

Make sure 'Search in anonymous and content scripts' is checked in the DevTools Preferences (F1). This will return results from within iframes and HTML inline scripts:

Getting windbg without the whole WDK?

The standalone MSI file of windbg can be downloaded from here. The version is 6.12.0002.633 (x86). http://download.microsoft.com/download/A/6/A/A6AC035D-DA3F-4F0C-ADA4-37C8E5D34E3D/setup/WinSDKDebuggingTools/dbg_x86.msi

How to redirect from one URL to another URL?

Since you tagged the question with javascript and html...

For a purely HTML solution, you can use a meta tag in the header to "refresh" the page, specifying a different URL:

<meta HTTP-EQUIV="REFRESH" content="0; url=http://www.yourdomain.com/somepage.html">

If you can/want to use JavaScript, you can set the location.href of the window:

<script type="text/javascript">
    window.location.href = "http://www.yourdomain.com/somepage.html";
</script>

Declare a dictionary inside a static class

Old question, but I found this useful. Turns out, there's also a specialized class for a Dictionary using a string for both the key and the value:

private static readonly StringDictionary SegmentSyntaxErrorCodes = new StringDictionary
{
    { "1", "Unrecognized segment ID" },
    { "2", "Unexpected segment" }
};

Edit: Per Chris's comment below, using Dictionary<string, string> over StringDictionary is generally preferred but will depend on your situation. If you're dealing with an older code base, you might be limited to the StringDictionary. Also, note that the following line:

myDict["foo"]

will return null if myDict is a StringDictionary, but an exception will be thrown in case of Dictionary<string, string>. See the SO post he mentioned for more information, which is the source of this edit.

Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

Upgrade MySql driver to Connector/Python 8.0.17 or greater than 8.0.17, Those who are using greater than MySQL 5.5 version

How to use the start command in a batch file?

An extra pair of rabbits' ears should do the trick.

start "" "C:\Program...

START regards the first quoted parameter as the window-title, unless it's the only parameter - and any switches up until the executable name are regarded as START switches.

ERROR: permission denied for relation tablename on Postgres while trying a SELECT as a readonly user

Try to add

GRANT USAGE ON SCHEMA public to readonly;

You probably were not aware that one needs to have the requisite permissions to a schema, in order to use objects in the schema.

Throw keyword in function's signature

To add a bit more value to all the other answer's to this question, one should invest a few minutes in the question: What is the output of the following code?

#include <iostream>
void throw_exception() throw(const char *)
{
    throw 10;
}
void my_unexpected(){
    std::cout << "well - this was unexpected" << std::endl;
}
int main(int argc, char **argv){
    std::set_unexpected(my_unexpected);
    try{
        throw_exception();
    }catch(int x){
        std::cout << "catch int: " << x << std::endl;
    }catch(...){
        std::cout << "catch ..." << std::endl;
    }
}

Answer: As noted here, the program calls std::terminate() and thus none of the exception handlers will get called.

Details: First my_unexpected() function is called, but since it doesn't re-throw a matching exception type for the throw_exception() function prototype, in the end, std::terminate() is called. So the full output looks like this:

user@user:~/tmp$ g++ -o except.test except.test.cpp
user@user:~/tmp$ ./except.test
well - this was unexpected
terminate called after throwing an instance of 'int'
Aborted (core dumped)

How to convert interface{} to string?

You don't need to use a type assertion, instead just use the %v format specifier with Sprintf:

hostAndPort := fmt.Sprintf("%v:%v", arguments["<host>"], arguments["<port>"])

is there something like isset of php in javascript/jQuery?

Some parts of each of these answers work. I compiled them all down into a function "isset" just like the question was asking and works like it does in PHP.

// isset helper function 
var isset = function(variable){
    return typeof(variable) !== "undefined" && variable !== null && variable !== '';
}

Here is a usage example of how to use it:

var example = 'this is an example';
if(isset(example)){
    console.log('the example variable has a value set');
}

It depends on the situation you need it for but let me break down what each part does:

typeof(variable) !== "undefined" checks if the variable is defined at all
variable !== null checks if the variable is null (some people explicitly set null and don't think if it is set to null that that is correct, in that case, remove this part)
variable !== '' checks if the variable is set to an empty string, you can remove this if an empty string counts as set for your use case

Hope this helps someone :)

Pandas get the most frequent values of a column

To get the n most frequent values, just subset .value_counts() and grab the index:

# get top 10 most frequent names
n = 10
dataframe['name'].value_counts()[:n].index.tolist()

React Native fixed footer

The best way is to use justifyContent property

<View style={{flexDirection:'column',justifyContent:'flex-end'}}>
     <View>
        <Text>fixed footer</Text>
    </View>
</View>

if you have multiple view elements on screen, then you can use

<View style={{flexDirection:'column',justifyContent:'space-between'}}>
     <View>
        <Text>view 1</Text>
    </View>
    <View>
        <Text>view 2</Text>
    </View>
    <View>
        <Text>fixed footer</Text>
    </View>
</View>

How to set ID using javascript?

Do you mean like this?

var hello1 = document.getElementById('hello1');
hello1.id = btoa(hello1.id);

To further the example, say you wanted to get all elements with the class 'abc'. We can use querySelectorAll() to accomplish this:

HTML

<div class="abc"></div>
<div class="abc"></div>

var abcElements = document.querySelectorAll('.abc');

// Set their ids
for (var i = 0; i < abcElements.length; i++)
    abcElements[i].id = 'abc-' + i;

This will assign the ID 'abc-<index number>' to each element. So it would come out like this:

<div class="abc" id="abc-0"></div>
<div class="abc" id="abc-1"></div>

To create an element and assign an id we can use document.createElement() and then appendChild().

var div = document.createElement('div');
div.id = 'hello1';

var body = document.querySelector('body');
body.appendChild(div);

Update

You can set the id on your element like this if your script is in your HTML file.

<input id="{{str(product["avt"]["fto"])}}" >
<span>New price :</span>
<span class="assign-me">

<script type="text/javascript">
    var s = document.getElementsByClassName('assign-me')[0];
    s.id = btoa({{str(produit["avt"]["fto"])}});
</script>

Your requirements still aren't 100% clear though.

How to use glyphicons in bootstrap 3.0

Bootstrap 3 requires span tag not i

<span class="glyphicon glyphicon-search"></span>`

How to update each dependency in package.json to the latest version?

If you don't want to install global npm-check-updates you can simply run that:

node -e "const pk = JSON.parse(require('fs').readFileSync('package.json', 'utf-8'));require('child_process').spawn('npm', ['install', ...Object.keys(Object.assign({},pk.dependencies, pk.devDependencies)).map(a=>a+'@latest')]).stdout.on('data', d=>console.log(d.toString()))"

Find if a String is present in an array

String[] a= {"tube", "are", "fun"};
Arrays.asList(a).contains("any");

How to make <div> fill <td> height

Modify the background image of the <td> itself.

Or apply some css to the div:

.thatSetsABackgroundWithAnIcon{
    height:100%;
}

What is the difference between user variables and system variables?

Environment variables are 'evaluated' (ie. they are attributed) in the following order:

System variables
Variables defined in autoexec.bat
User variables

Every process has an environment block that contains a set of environment variables and their values. There are two types of environment variables: user environment variables (set for each user) and system environment variables (set for everyone). A child process inherits the environment variables of its parent process by default.

Programs started by the command processor inherit the command processor's environment variables.

Environment variables specify search paths for files, directories for temporary files, application-specific options, and other similar information. The system maintains an environment block for each user and one for the computer. The system environment block represents environment variables for all users of the particular computer. A user's environment block represents the environment variables the system maintains for that particular user, including the set of system environment variables.

How do I perform HTML decoding/encoding using Python/Django?

This is the easiest solution for this problem -

{% autoescape on %}
   {{ body }}
{% endautoescape %}

From this page.

What are .NET Assemblies?

An assembly is a collection of types and resources that forms a logical unit of functionality. All types in the .NET Framework must exist in assemblies; the common language runtime does not support types outside of assemblies. Each time you create a Microsoft Windows® Application, Windows Service, Class Library, or other application with Visual Basic .NET, you're building a single assembly. Each assembly is stored as an .exe or .dll file.

Source : https://msdn.microsoft.com/en-us/library/ms973231.aspx#assenamesp_topic4

For those with Java background like me hope following diagram clarifies concepts -

Assemblies are just like jar files (containing multiple .class files). Your code can reference an existing assemblie or you code itself can be published as an assemblie for other code to reference and use (you can think this as jar files in Java that you can add in your project dependencies).

At the end of the day an assembly is a compiled code that can be run on any operating system with CLR installed. This is same as saying .class file or bundled jar can run on any machine with JVM installed.

In python, what is the difference between random.uniform() and random.random()?

random.random() gives you a random floating point number in the range [0.0, 1.0) (so including 0.0, but not including 1.0 which is also known as a semi-open range). random.uniform(a, b) gives you a random floating point number in the range [a, b], (where rounding may end up giving you b).

The implementation of random.uniform() uses random.random() directly:

def uniform(self, a, b):
    "Get a random number in the range [a, b) or [a, b] depending on rounding."
    return a + (b-a) * self.random()

random.uniform(0, 1) is basically the same thing as random.random() (as 1.0 times float value closest to 1.0 still will give you float value closest to 1.0 there is no possibility of a rounding error there).

What values can I pass to the event attribute of the f:ajax tag?

I just input some value that I knew was invalid and here is the output:

'whatToInput' is not a supported event for HtmlPanelGrid. Please specify one of these supported event names: click, dblclick, keydown, keypress, keyup, mousedown, mousemove, mouseout, mouseover, mouseup.

So values you can pass to event are

click
dblclick
keydown
mousedown
mousemove
mouseover
mouseup

implements Closeable or implements AutoCloseable

AutoCloseable (introduced in Java 7) makes it possible to use the try-with-resources idiom:

public class MyResource implements AutoCloseable {

    public void close() throws Exception {
        System.out.println("Closing!");
    }

}

Now you can say:

try (MyResource res = new MyResource()) {
    // use resource here
}

and JVM will call close() automatically for you.

Closeable is an older interface. ~~For some reason~~ To preserve backward compatibility, language designers decided to create a separate one. This allows not only all Closeable classes (like streams throwing IOException) to be used in try-with-resources, but also allows throwing more general checked exceptions from close().

When in doubt, use AutoCloseable, users of your class will be grateful.

Set Background color programmatically

If you just want to use some of the predefined Android colors, you can use Color.COLOR (where COLOR is BLACK, WHITE, RED, etc.):

myView.setBackgroundColor(Color.GREEN);

Otherwise you can do as others have suggested with

myView.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.myCustomGreen));

I don't recommend using a hex color directly. You should keep all of your custom colors in colors.xml.

How to remove all .svn directories from my application directories

There are already many answers provided for deleting the .svn-directory. But I want to add, that you can avoid these directories from the beginning, if you do an export instead of a checkout:

svn export <url>

Python creating a dictionary of lists

Personally, I just use JSON to convert things to strings and back. Strings I understand.

import json
s = [('yellow', 1), ('blue', 2), ('yellow', 3), ('blue', 4), ('red', 1)]
mydict = {}
hash = json.dumps(s)
mydict[hash] = "whatever"
print mydict
#{'[["yellow", 1], ["blue", 2], ["yellow", 3], ["blue", 4], ["red", 1]]': 'whatever'}

How to SELECT a dropdown list item by value programmatically

Please try below:

myDropDown.SelectedIndex = 
myDropDown.Items.IndexOf(myDropDown.Items.FindByValue("myValue"))

Useful example of a shutdown hook in Java?

Shutdown Hooks are unstarted threads that are registered with Runtime.addShutdownHook().JVM does not give any guarantee on the order in which shutdown hooks are started.For more info refer http://techno-terminal.blogspot.in/2015/08/shutdown-hooks.html

Java count occurrence of each item in an array

you can find using HashMap with simple technic

public class HashMapExample {
    public static void main(String[] args) {
        stringArray();          
    }
public static void stringArray()
{
    String[] a = {"name1","name2","name3","name4", "name5"};

    Map<String, String> hm = new HashMap<String, String>();
    for(int i=0;i<a.length;i++)
    {
    String bl=(String)hm.get(a[i]);
    if(bl==null)
    {
        hm.put(a[i],String.valueOf(1));
    }else
    {
        String k=hm.get(a[i]);
        int j=Integer.valueOf(k);
        hm.put(a[i],String.valueOf(j+1));
    }

    }
    //hm.entrySet();
    System.out.println("map elements are "+hm.toString());
}

}

Mongoose (mongodb) batch insert?

Here are both way of saving data with insertMany and save

1) Mongoose save array of documents with insertMany in bulk

/* write mongoose schema model and export this */
var Potato = mongoose.model('Potato', PotatoSchema);

/* write this api in routes directory  */
router.post('/addDocuments', function (req, res) {
    const data = [/* array of object which data need to save in db */];

    Potato.insertMany(data)  
    .then((result) => {
            console.log("result ", result);
            res.status(200).json({'success': 'new documents added!', 'data': result});
    })
    .catch(err => {
            console.error("error ", err);
            res.status(400).json({err});
    });
})

2) Mongoose save array of documents with .save()

These documents will save parallel.

/* write mongoose schema model and export this */
var Potato = mongoose.model('Potato', PotatoSchema);

/* write this api in routes directory  */
router.post('/addDocuments', function (req, res) {
    const saveData = []
    const data = [/* array of object which data need to save in db */];
    data.map((i) => {
        console.log(i)
        var potato = new Potato(data[i])
        potato.save()
        .then((result) => {
            console.log(result)
            saveData.push(result)
            if (saveData.length === data.length) {
                res.status(200).json({'success': 'new documents added!', 'data': saveData});
            }
        })
        .catch((err) => {
            console.error(err)
            res.status(500).json({err});
        })
    })
})

Can a constructor in Java be private?

Basic idea behind having a private constructor is to restrict the instantiation of a class from outside by JVM, but if a class having a argument constructor, then it infers that one is intentionally instantiating.

Launch programs whose path contains spaces

Try:-

Dim objShell
Set objShell = WScript.CreateObject( "WScript.Shell" )
objShell.Run("""c:\Program Files\Mozilla Firefox\firefox.exe""")
Set objShell = Nothing

Note the extra ""s in the string. Since the path to the exe contains spaces it needs to be contained with in quotes. (In this case simply using "firefox.exe" would work).

Also bear in mind that many programs exist in the c:\Program Files (x86) folder on 64 bit versions of Windows.

How do I open multiple instances of Visual Studio Code?

I came here to find out how to make VSCode (Mac OS) create a new window when a file or folder is opened and VSCode is already running. The same as GitHub Atom does. The answers above haven't answered my query, bit I've found answer myself so will share.

Setting: window.openFilesInNewWindow - if set to on, files will open in a new window. window.openFoldersInNewWindow - if set to on, folders will open in a new window.

Bonus to make it behave like Atom: Set window.newWindowDimensions to maximised.

Main differences between SOAP and RESTful web services in Java

SOAP

Simple Object Access Protocol (SOAP) is a standard, an XML language, defining a message architecture and message formats. It is used by Web services. It contains a description of the operations.

WSDL is an XML-based language for describing Web services and how to access them. It will run on SMTP, HTTP, FTP, etc. It requires middleware support and well-defined mechanism to define services like WSDL+XSD and WS-Policy. SOAP will return XML based data

REST

Representational State Transfer (RESTful) web services. They are second-generation Web services.

RESTful web services communicate via HTTP rather than SOAP-based services and do not require XML messages or WSDL service-API definitions. For REST middleware is not required, only HTTP support is needed. It is a WADL standard, REST can return XML, plain text, JSON, HTML, etc.

How to install lxml on Ubuntu

As @Pepijn commented on @Druska 's answer, on ubuntu 13.04 x64, there is no need to use lib32z1-dev, zlib1g-dev is enough:

sudo apt-get install libxml2-dev libxslt-dev python-dev zlib1g-dev

window.print() not working in IE

Add newWin.document.close();, like so:

function printDiv() {
   var divToPrint = document.getElementById('printArea');
   var newWin = window.open();
   newWin.document.write(divToPrint.innerHTML);
   newWin.document.close();
   newWin.print();
   newWin.close();
}

This makes IE happy. HTH, -Ted

IIS Config Error - This configuration section cannot be used at this path

Heres what worked for me, had a similar problem on my new laptop which had windows 10.

Search for "Turn windows features on or off"
Check "Internet Information Services"
Check "World Wide Web Services"
Check "Application Development Features"
Enable all items under this

try again, now it should work.

SQL Server NOLOCK and joins

I won't address the READ UNCOMMITTED argument, just your original question.

Yes, you need WITH(NOLOCK) on each table of the join. No, your queries are not the same.

Try this exercise. Begin a transaction and insert a row into table1 and table2. Don't commit or rollback the transaction yet. At this point your first query will return successfully and include the uncommitted rows; your second query won't return because table2 doesn't have the WITH(NOLOCK) hint on it.

Android Facebook 4.0 SDK How to get Email, Date of Birth and gender of User

Use FB static method getCurrentProfile() of Profile class to retrieve those info.

 Profile profile = Profile.getCurrentProfile();
 String firstName = profile.getFirstName());
 System.out.println(profile.getProfilePictureUri(20,20));
 System.out.println(profile.getLinkUri());

How to update parent's state in React?

I want to thank the most upvoted answer for giving me the idea of my own problem basically the variation of it with arrow function and passing param from child component:

 class Parent extends React.Component {
  constructor(props) {
    super(props)
    // without bind, replaced by arrow func below
  }

  handler = (val) => {
    this.setState({
      someVar: val
    })
  }

  render() {
    return <Child handler = {this.handler} />
  }
}

class Child extends React.Component {
  render() {
    return <Button onClick = {() => this.props.handler('the passing value')}/ >
  }
}

Hope it helps someone.

Java: Check the date format of current string is according to required format or not

Disclaimer

Parsing a string back to date/time value in an unknown format is inherently impossible (let's face it, what does 3/3/3 actually mean?!), all we can do is "best effort"

Important

This solution doesn't throw an Exception, it returns a boolean, this is by design. Any Exceptions are used purely as a guard mechanism.

2018

Since it's now 2018 and Java 8+ has the date/time API (and the rest have the ThreeTen backport). The solution remains basically the same, but becomes slightly more complicated, as we need to perform checks for:

date and time
date only
time only

This makes it look something like...

public static boolean isValidFormat(String format, String value, Locale locale) {
    LocalDateTime ldt = null;
    DateTimeFormatter fomatter = DateTimeFormatter.ofPattern(format, locale);

    try {
        ldt = LocalDateTime.parse(value, fomatter);
        String result = ldt.format(fomatter);
        return result.equals(value);
    } catch (DateTimeParseException e) {
        try {
            LocalDate ld = LocalDate.parse(value, fomatter);
            String result = ld.format(fomatter);
            return result.equals(value);
        } catch (DateTimeParseException exp) {
            try {
                LocalTime lt = LocalTime.parse(value, fomatter);
                String result = lt.format(fomatter);
                return result.equals(value);
            } catch (DateTimeParseException e2) {
                // Debugging purposes
                //e2.printStackTrace();
            }
        }
    }

    return false;
}

This makes the following...

System.out.println("isValid - dd/MM/yyyy with 20130925 = " + isValidFormat("dd/MM/yyyy", "20130925", Locale.ENGLISH));
System.out.println("isValid - dd/MM/yyyy with 25/09/2013 = " + isValidFormat("dd/MM/yyyy", "25/09/2013", Locale.ENGLISH));
System.out.println("isValid - dd/MM/yyyy with 25/09/2013 12:13:50 = " + isValidFormat("dd/MM/yyyy", "25/09/2013  12:13:50", Locale.ENGLISH));
System.out.println("isValid - yyyy-MM-dd with 2017-18--15 = " + isValidFormat("yyyy-MM-dd", "2017-18--15", Locale.ENGLISH));

output...

isValid - dd/MM/yyyy with 20130925 = false
isValid - dd/MM/yyyy with 25/09/2013 = true
isValid - dd/MM/yyyy with 25/09/2013 12:13:50 = false
isValid - yyyy-MM-dd with 2017-18--15 = false

Original Answer

Simple try and parse the String to the required Date using something like SimpleDateFormat

Date date = null;
try {
    SimpleDateFormat sdf = new SimpleDateFormat(format);
    date = sdf.parse(value);
    if (!value.equals(sdf.format(date))) {
        date = null;
    }
} catch (ParseException ex) {
    ex.printStackTrace();
}
if (date == null) {
    // Invalid date format
} else {
    // Valid date format
}

You could then simply write a simple method that performed this action and returned true when ever Date was not null...

As a suggestion...

Updated with running example

I'm not sure what you are doing, but, the following example...

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class TestDateParser {

    public static void main(String[] args) {
        System.out.println("isValid - dd/MM/yyyy with 20130925 = " + isValidFormat("dd/MM/yyyy", "20130925"));
        System.out.println("isValid - dd/MM/yyyy with 25/09/2013 = " + isValidFormat("dd/MM/yyyy", "25/09/2013"));
        System.out.println("isValid - dd/MM/yyyy with 25/09/2013 12:13:50 = " + isValidFormat("dd/MM/yyyy", "25/09/2013  12:13:50"));
    }

    public static boolean isValidFormat(String format, String value) {
        Date date = null;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            date = sdf.parse(value);
            if (!value.equals(sdf.format(date))) {
                date = null;
            }
        } catch (ParseException ex) {
            ex.printStackTrace();
        }
        return date != null;
    }

}

Outputs (something like)...

java.text.ParseException: Unparseable date: "20130925"
isValid - dd/MM/yyyy with 20130925 = false
isValid - dd/MM/yyyy with 25/09/2013 = true
isValid - dd/MM/yyyy with 25/09/2013 12:13:50 = false
    at java.text.DateFormat.parse(DateFormat.java:366)
    at javaapplication373.JavaApplication373.isValidFormat(JavaApplication373.java:28)
    at javaapplication373.JavaApplication373.main(JavaApplication373.java:19)

Not correct. For isValidFormat("yyyy-MM-dd", "2017-18--15"); not throw any Exception.

isValid - yyyy-MM-dd", "2017-18--15 = false

Seems to work as expected for me - the method doesn't rely on (nor does it throw) the exception alone to perform it's operation

Generate random string/characters in JavaScript

Try this, what i use every time :

_x000D_

function myFunction() {_x000D_
        var hash = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ012346789";_x000D_
        var random8 = '';_x000D_
        for(var i = 0; i < 5; i++){_x000D_
            random8 += hash[parseInt(Math.random()*hash.length)];_x000D_
        }_x000D_
        console.log(random8);_x000D_
    document.getElementById("demo").innerHTML = "Your 5 character string ===> "+random8;_x000D_
}        _x000D_

_x000D_

<!DOCTYPE html>_x000D_
<html>_x000D_
<body>_x000D_
_x000D_
<p>Click the button to genarate 5 character random string .</p>_x000D_
_x000D_
<button onclick="myFunction()">Click me</button>_x000D_
_x000D_
<p id="demo"></p>_x000D_
_x000D_
_x000D_
_x000D_
</body>_x000D_
</html>

_x000D_

python: order a list of numbers without built-in sort, min, max function

Here is something that i have been trying.(Insertion sort- not the best way to sort but does the work)

def sort(list):
    for index in range(1,len(list)):
        value = list[index]
        i = index-1
        while i>=0:
            if value < list[i]:
                list[i+1] = list[i]
                list[i] = value
                i -= 1
            else:
                break

Relative imports in Python 3

I had a similar problem and solved it by creating a symbolic link to the package in the working directory:

ln -s ../../../my_package my_package

and then import it as usual:

import my_package

I know this is more like a "Linux" solution rather than a "Python" solution. but it's a valid approach nonetheless.

Rename multiple files in a directory in Python

Here is a more general solution:

This code can be used to remove any particular character or set of characters recursively from all filenames within a directory and replace them with any other character, set of characters or no character.

import os

paths = (os.path.join(root, filename)
        for root, _, filenames in os.walk('C:\FolderName')
        for filename in filenames)

for path in paths:
    # the '#' in the example below will be replaced by the '-' in the filenames in the directory
    newname = path.replace('#', '-')
    if newname != path:
        os.rename(path, newname)

How to create an installer for a .net Windows Service using Visual Studio

In the service project do the following:

In the solution explorer double click your services .cs file. It should bring up a screen that is all gray and talks about dragging stuff from the toolbox.
Then right click on the gray area and select add installer. This will add an installer project file to your project.
Then you will have 2 components on the design view of the ProjectInstaller.cs (serviceProcessInstaller1 and serviceInstaller1). You should then setup the properties as you need such as service name and user that it should run as.

Now you need to make a setup project. The best thing to do is use the setup wizard.

Right click on your solution and add a new project: Add > New Project > Setup and Deployment Projects > Setup Wizard

a. This could vary slightly for different versions of Visual Studio. b. Visual Studio 2010 it is located in: Install Templates > Other Project Types > Setup and Deployment > Visual Studio Installer
On the second step select "Create a Setup for a Windows Application."
On the 3rd step, select "Primary output from..."
Click through to Finish.

Next edit your installer to make sure the correct output is included.

Right click on the setup project in your Solution Explorer.
Select View > Custom Actions. (In VS2008 it might be View > Editor > Custom Actions)
Right-click on the Install action in the Custom Actions tree and select 'Add Custom Action...'
In the "Select Item in Project" dialog, select Application Folder and click OK.
Click OK to select "Primary output from..." option. A new node should be created.
Repeat steps 4 - 5 for commit, rollback and uninstall actions.

You can edit the installer output name by right clicking the Installer project in your solution and select Properties. Change the 'Output file name:' to whatever you want. By selecting the installer project as well and looking at the properties windows, you can edit the Product Name, Title, Manufacturer, etc...

Next build your installer and it will produce an MSI and a setup.exe. Choose whichever you want to use to deploy your service.

SMTP server response: 530 5.7.0 Must issue a STARTTLS command first

Out of the box Swift Mailer can't do STARTTLS, however some nice guys have written a patch for it.

I found patching it was a bit of a chore (probably went about it the wrong way), so have zipped it up ready for download here: Swift Mailer with STARTTLS

forEach() in React JSX does not output any HTML

You need to pass an array of element to jsx. The problem is that forEach does not return anything (i.e it returns undefined). So it's better to use map because map returns an array:

class QuestionSet extends Component {
render(){ 
    <div className="container">
       <h1>{this.props.question.text}</h1>
       {this.props.question.answers.map((answer, i) => {     
           console.log("Entered");                 
           // Return the element. Also pass key     
           return (<Answer key={answer} answer={answer} />) 
        })}
}

export default QuestionSet;

ALTER TABLE DROP COLUMN failed because one or more objects access this column

You must remove the constraints from the column before removing the column. The name you are referencing is a default constraint.

e.g.

alter table CompanyTransactions drop constraint [df__CompanyTr__Creat__0cdae408];
alter table CompanyTransactions drop column [Created];

Eclipse add Tomcat 7 blank server name

I had a similar issue except the "Server Name" field was disabled.

Found this was due to the Apache Tomcat v7.0 runtime environment pointing to the wrong folder. This was fixed by going to Window - Preferences - Server - Runtime Environments, clicking on the runtime environment entry and clicking "Edit..." and then modifying the Tomcat installation directory.

How to escape special characters in building a JSON string?

The answer the direct question:
To be safe, replace the required character with \u+4-digit-hex-value

Example: If you want to escape the apostrophe ' replace with \u0027
D'Amico becomes D\u0027Amico

NICE REFERENCE: http://es5.github.io/x7.html#x7.8.4

https://mathiasbynens.be/notes/javascript-escapes

Fastest way to ping a network range and return responsive hosts?

This script runs on Git Bash (MINGW64) on Windows and return a messages depending of the ping result.

#!/bin/bash
#$1 should be something like "19.62.55"

if [ -z "$1" ]
  then
    echo "No identify of the network supplied, i.e. 19.62.55"
else
    ipAddress=$1

    for i in {1..256} ;do 
    (
        {
        ping -w 5 $ipAddress.$i ; 
        result=$(echo $?);
        } &> /dev/null


        if [ $result = 0 ]; then
            echo Successful Ping From : $ipAddress.$i
        else
            echo Failed Ping From : $ipAddress.$i
        fi &);
    done

fi

How store a range from excel into a Range variable?

here is an example that allows for performing code on each line of the desired areas (pick either from top & bottom of selection, of from selection

Sub doROWSb()           'WORKS    for do selected rows     SEE FIX ROWS ABOVE  (small ver)
Dim E7 As String    'note:  workcell E7 shows:  BG381
E7 = RANGE("E7")    'see eg below
Dim r As Long       'NOTE: this example has a paste formula(s) down a column(s).  WILL REDUCE 10 HOUR DAYS OF PASTING COLUMNS, DOWN TO 3 MINUTES?
Dim c As Long
Dim rCell As RANGE
'Dim LastRow As Long
r = ActiveCell.row
c = ActiveCell.Column   'might not matter if your code affects whole line anyways, still leave as is

Dim FirstRow As Long    'not in use, Delete if only want last row, note: this code already allows for selection as start
Dim LastRow As Long


If 1 Then     'if you are unable to delete rows not needed, just change 2 lines from: If 1, to if 0 (to go from selection last row, to all rows down from selection)
With Selection
    'FirstRow = .Rows(1).row                 'not used here, Delete if only want last row
    LastRow = .Rows(.Rows.Count).row        'find last row in selection
End With
application.CutCopyMode = False             'if not doing any paste op below
Else
    LastRow = Cells(Rows.Count, 1).End(xlUp).row  'find last row used in sheet
End If
application.EnableEvents = True             'EVENTS  need this?
application.ScreenUpdating = False          'offset-cells(row, col)
'RANGE(E7).Select  'TOP ROW SELECT
RANGE("A1") = vbNullString                  'simple macros on-off switch, vb not here:  If RANGE("A1").Value > 0 Then


For Each rCell In RANGE(Cells(r, c), Cells(LastRow, c)) 'new
    rCell.Select    'make 3 macros for each paste macro below
'your code here:

If 1 Then     'to if 0, if want to paste formulas/formats/all down a column
    Selection.EntireRow.Calculate     'calcs all selected rows, even if just selecting 1 cell in each row (might only be doing 1 row aat here, as part of loop)
Else
'dorows() DO ROWS()
'eg's for paste cells down a column, can make 3 separate macros for each: sub alte() altf & altp
      Selection.PasteSpecial Paste:=xlPasteFormulas, Operation:=xlNone, SkipBlanks:=False, Transpose:=False    'make sub alte ()    add thisworkbook:  application.OnKey "%{e}", "alte"
      'Selection.PasteSpecial Paste:=xlPasteFormats, Operation:=xlNone, SkipBlanks:=False, Transpose:=False     'make sub altf ()    add thisworkbook:  application.OnKey "%{f}", "altf"
      'Selection.PasteSpecial Paste:=xlPasteAll, Operation:=xlNone, SkipBlanks:=False, Transpose:=False         'amke sub altp ()    add thisworkbook:  application.OnKey "%{p}", "altp"
End If
Next rCell

'application.CutCopyMode = False            'finished - stop copy mode
'RANGE("A2").Select
goBEEPS (2), (0.25)       'beeps secs
application.EnableEvents = True             'EVENTS

'note:  workcell E7 has: SUBSTITUTE(SUBSTITUTE(CELL("address",$BG$369),"$",""),"","")
'other col eg (shows: BG:BG):  =SUBSTITUTE(SUBSTITUTE(CELL("address",$BG2),"$",""),ROW(),"")&":"& SUBSTITUTE(SUBSTITUTE(CELL("address",$BG2),"$",""),ROW(),"")
End Sub


'OTHER:
Sub goBEEPSx(b As Long, t As Double)   'beeps secs as:  goBEEPS (2), (0.25)  OR:  goBEEPS(2, 0.25)
  Dim dt  'as double    'worked wo as double
  Dim x
  For b = b To 1 Step -1
    Beep
    x = Timer
  Do
  DoEvents
  dt = Timer - x
  If dt < 0 Then dt = dt + 86400    '86400 no. seconds in a day, in case hit midnight & timer went down to 0
  Loop Until dt >= t
  Next
End Sub

Validate form field only on submit or user input

Erik Aigner,

Please use $dirty(The field has been modified) and $invalid (The field content is not valid).

Please check below examples for angular form validation

Validation example HTML for user enter inputs:

<form  ng-app="myApp"  ng-controller="validateCtrl" name="myForm" novalidate>
  <p>Email:<br>
    <input type="email" name="email" ng-model="email" required>
    <span ng-show="myForm.email.$dirty && myForm.email.$invalid">
      <span ng-show="myForm.email.$error.required">Email is required.</span>
      <span ng-show="myForm.email.$error.email">Invalid email address.</span>
      </span>
  </p>
    </form>

Validation example HTML/Js for user submits :

      <form  ng-app="myApp"  ng-controller="validateCtrl" name="myForm" novalidate form-submit-validation="">
      <p>Email:<br>
        <input type="email" name="email" ng-model="email" required>
        <span ng-show="submitted || myForm.email.$dirty && myForm.email.$invalid">
          <span ng-show="myForm.email.$error.required">Email is required.</span>
          <span ng-show="myForm.email.$error.email">Invalid email address.</span>
          </span>
      </p>
<p>
  <input type="submit">
</p>
</form>

Custom Directive :

app.directive('formSubmitValidation', function () {

        return {
            require: 'form',
            compile: function (tElem, tAttr) {

                tElem.data('augmented', true);

                return function (scope, elem, attr, form) {
                    elem.on('submit', function ($event) {
                        scope.$broadcast('form:submit', form);

                        if (!form.$valid) {
                            $event.preventDefault();
                        }
                        scope.$apply(function () {
                            scope.submitted = true;
                        });


                    });
                }
            }
        };


  })

you don't want use directive use ng-change function like below

  <form  ng-app="myApp"  ng-controller="validateCtrl" name="myForm" novalidate ng-change="submitFun()">
      <p>Email:<br>
        <input type="email" name="email" ng-model="email" required>
        <span ng-show="submitted || myForm.email.$dirty && myForm.email.$invalid">
          <span ng-show="myForm.email.$error.required">Email is required.</span>
          <span ng-show="myForm.email.$error.email">Invalid email address.</span>
          </span>
      </p>
<p>
  <input type="submit">
</p>
</form>

Controller SubmitFun() JS:

 var app = angular.module('example', []);
 app.controller('exampleCntl', function($scope) {
 $scope.submitFun = function($event) {
 $scope.submitted = true;
  if (!$scope.myForm.$valid) 
  {
        $event.preventDefault();
   }
  }

});

How do I get the RootViewController from a pushed controller?

How about asking the UIApplication singleton for its keyWindow, and from that UIWindow ask for the root view controller (its rootViewController property):

UIViewController root = [[[UIApplication sharedApplication] keyWindow] rootViewController];

What is a 'NoneType' object?

In the error message, instead of telling you that you can't concatenate two objects by showing their values (a string and None in this example), the Python interpreter tells you this by showing the types of the objects that you tried to concatenate. The type of every string is str while the type of the single None instance is called NoneType.

You normally do not need to concern yourself with NoneType, but in this example it is necessary to know that type(None) == NoneType.

How to distinguish mouse "click" and "drag"

It's really this simple

var dragged = false
window.addEventListener('mousedown', function () { dragged = false })
window.addEventListener('mousemove', function () { dragged = true })
window.addEventListener('mouseup', function() {
        if (dragged == true) { return }
        console.log("CLICK!! ")
})

You honestly do not want to add a threshold allowing a small movement. The above is the correct, normal, feel of clicking on all desktop interfaces.

Just try it.

You can easily add an event if you like.

UINavigationBar custom back button without title

I'm written an extension to make this easier:

extension UIViewController {

    /// Convenience for setting the back button, which will be used on any view controller that this one pushes onto the stack
    @objc var backButtonTitle: String? {
        get {
            return navigationItem.backBarButtonItem?.title
        }
        set {
            if let existingBackBarButtonItem = navigationItem.backBarButtonItem {
                existingBackBarButtonItem.title = newValue
            }
            else {
                let newNavigationItem = UIBarButtonItem(title: newValue, style:.plain, target: nil, action: nil)
                navigationItem.backBarButtonItem = newNavigationItem
            }
        }
    }

}

Viewing localhost website from mobile device

Try this https://ngrok.com/docs#expose

Just run ngrok 3000 , 3000 is the port number you want to expose to the internet. You can insert the port number which you want to expose, for rails its 3000. This will tunnel your localhost to the internet and you will be able to view your local host from anywhere

async for loop in node.js

I like to use the recursive pattern for this scenario. For example, something like this:

// If config is an array of queries
var config = JSON.parse(queries.querrryArray);   

// Array of results
var results;

processQueries(config);

function processQueries(queries) {
    var searchQuery;

    if (queries.length == 0) {
        // All queries complete
        res.writeHead(200, {'content-type': 'application/json'});
        res.end(JSON.stringify({results: results}));
        return;
    }

    searchQuery = queries.pop();

    search(searchQuery, function(result) {
        results.push(JSON.stringify({result: result}); 
        processQueries();            
    });

}

processQueries is a recursive function that will pull a query element out of an array of queries to process. Then the callback function calls processQueries again when the query is complete. The processQueries knows to end when there are no queries left.

It is easiest to do this using arrays, but it could be modified to work with object key/values I imagine.

Replacing H1 text with a logo image: best method for SEO and accessibility?

One point no one has touched on is the fact that the h1 attribute should be specific to every page and using the site logo will effectively replicate the H1 on every page of the site.

I like to use a z index hidden h1 for each page as the best SEO h1 is often not the best for sales or aesthetic value.

Java Package Does Not Exist Error

Are they in the right subdirectories?

If you put /usr/share/stuff on the class path, files defined with package org.name should be in /usr/share/stuff/org/name.

EDIT: If you don't already know this, you should probably read this: http://download.oracle.com/javase/1.5.0/docs/tooldocs/windows/classpath.html#Understanding

EDIT 2: Sorry, I hadn't realised you were talking of Java source files in /usr/share/stuff. Not only they need to be in the appropriate sub-directory, but you need to compile them. The .java files don't need to be on the classpath, but on the source path. (The generated .class files need to be on the classpath.)

You might get away with compiling them if they're not under the right directory structure, but they should be, or it will generate warnings at least. The generated class files will be in the right subdirectories (wherever you've specified -d if you have).

You should use something like javac -sourcepath .:/usr/share/stuff test.java, assuming you've put the .java files that were under /usr/share/stuff under /usr/share/stuff/org/name (or whatever is appropriate according to their package names).

Writing to CSV with Python adds blank lines

import csv

hello = [['Me','You'],['293', '219'],['13','15']]
length = len(hello[0])

with open('test1.csv', 'wb') as testfile:
    csv_writer = csv.writer(testfile)
    for y in range(length):
        csv_writer.writerow([x[y] for x in hello])

will produce an output like this

Me You
293 219
13 15

Hope this helps

Best way to update data with a RecyclerView adapter

Found following solution working for my similar problem:

private ExtendedHashMap mData = new ExtendedHashMap();
private  String[] mKeys;

public void setNewData(ExtendedHashMap data) {
    mData.putAll(data);
    mKeys = data.keySet().toArray(new String[data.size()]);
    notifyDataSetChanged();
}

Using the clear-command

mData.clear()

is not nessescary

Convert String array to ArrayList

new ArrayList( Arrays.asList( new String[]{"abc", "def"} ) );

How to determine whether a substring is in a different string

def find_substring():
    s = 'bobobnnnnbobmmmbosssbob'
    cnt = 0
    for i in range(len(s)):
        if s[i:i+3] == 'bob':
            cnt += 1
    print 'bob found: ' + str(cnt)
    return cnt

def main():
    print(find_substring())

main()

What is the difference between HAVING and WHERE in SQL?

When GROUP BY is not used, the WHERE and HAVING clauses are essentially equivalent.

However, when GROUP BY is used:

The WHERE clause is used to filter records from a result. The filtering occurs before any groupings are made.
The HAVING clause is used to filter values from a group (i.e., to check conditions after aggregation into groups has been performed).

Resource from Here

css background image in a different folder from css

you can use this

body{ background-image: url('../img/bg.png'); }

I tried this on my project where I need to set the background image of a div so I used this and it worked!

How to find file accessed/created just few minutes ago

If you know the file is in your current directory, I would use:

ls -lt | head

This lists your most recently modified files and directories in order. In fact, I use it so much I have it aliased to 'lh'.

Simpler way to create dictionary of separate variables?

This is not possible in Python, which really doesn't have "variables". Python has names, and there can be more than one name for the same object.

How to sort the letters in a string alphabetically in Python

>>> a = 'ZENOVW'
>>> b = sorted(a)
>>> print b
['E', 'N', 'O', 'V', 'W', 'Z']

sorted returns a list, so you can make it a string again using join:

>>> c = ''.join(b)

which joins the items of b together with an empty string '' in between each item.

>>> print c
'ENOVWZ'

Creating a copy of an object in C#

The easiest way to do this is writing a copy constructor in the MyClass class.

Something like this:

namespace Example
{
    class MyClass
    {
        public int val;

        public MyClass()
        {
        }

        public MyClass(MyClass other)
        {
            val = other.val;
        }
    }
}

The second constructor simply accepts a parameter of his own type (the one you want to copy) and creates a new object assigned with the same value

class Program
{
    static void Main(string[] args)
    {
        MyClass objectA = new MyClass();
        MyClass objectB = new MyClass(objectA);
        objectA.val = 10;
        objectB.val = 20;
        Console.WriteLine("objectA.val = {0}", objectA.val);
        Console.WriteLine("objectB.val = {0}", objectB.val);
        Console.ReadKey();
    }
}

output:

objectA.val = 10

objectB.val = 20

Make Https call using HttpClient

Your code should be modified in this way:

httpClient.BaseAddress = new Uri("https://foobar.com/");

You have just to use the https: URI scheme. There's a useful page here on MSDN about the secure HTTP connections. Indeed:

Use the https: URI scheme

The HTTP Protocol defines two URI schemes:

http : Used for unencrypted connections.

https : Used for secure connections that should be encrypted. This option also uses digital certificates and certificate authorities to verify that the server is who it claims to be.

Moreover, consider that the HTTPS connections use a SSL certificate. Make sure your secure connection has this certificate otherwise the requests will fail.

EDIT:

Above code works fine for making http calls. But when I change the scheme to https it does not work, let me post the error.

What does it mean doesn't work? The requests fail? An exception is thrown? Clarify your question.

If the requests fail, then the issue should be the SSL certificate.

To fix the issue, you can use the class HttpWebRequest and then its property ClientCertificate. Furthermore, you can find here a useful sample about how to make a HTTPS request using the certificate.

An example is the following (as shown in the MSDN page linked before):

//You must change the path to point to your .cer file location. 
X509Certificate Cert = X509Certificate.CreateFromCertFile("C:\\mycert.cer");
// Handle any certificate errors on the certificate from the server.
ServicePointManager.CertificatePolicy = new CertPolicy();
// You must change the URL to point to your Web server.
HttpWebRequest Request = (HttpWebRequest)WebRequest.Create("https://YourServer/sample.asp");
Request.ClientCertificates.Add(Cert);
Request.UserAgent = "Client Cert Sample";
Request.Method = "GET";
HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();

warning: assignment makes integer from pointer without a cast

When you write the statement

*src = "anotherstring";

the compiler sees the constant string "abcdefghijklmnop" like an array. Imagine you had written the following code instead:

char otherstring[14] = "anotherstring";
...
*src = otherstring;

Now, it's a bit clearer what is going on. The left-hand side, *src, refers to a char (since src is of type pointer-to-char) whereas the right-hand side, otherstring, refers to a pointer.

This isn't strictly forbidden because you may want to store the address that a pointer points to. However, an explicit cast is normally used in that case (which isn't too common of a case). The compiler is throwing up a red flag because your code is likely not doing what you think it is.

It appears to me that you are trying to assign a string. Strings in C aren't data types like they are in C++ and are instead implemented with char arrays. You can't directly assign values to a string like you are trying to do. Instead, you need to use functions like strncpy and friends from <string.h> and use char arrays instead of char pointers. If you merely want the pointer to point to a different static string, then drop the *.

Python, print all floats to 2 decimal places in output

If what you want is to have the print operation automatically change floats to only show 2 decimal places, consider writing a function to replace 'print'. For instance:

def fp(*args):  # fp means 'floating print'
    tmps = []
    for arg in args:
        if type(arg) is float: arg = round(arg, 2)  # transform only floats
        tmps.append(str(arg))
    print(" ".join(tmps)

Use fp() in place of print ...

fp("PI is", 3.14159) ... instead of ... print "PI is", 3.14159

In Chrome 55, prevent showing Download button for HTML 5 video

May be the best way to utilize "download" button is to use JavaScript players, such as Videojs (http://docs.videojs.com/) or MediaElement.js (http://www.mediaelementjs.com/)

They do not have download button by default as a rule and moreover allow you to customize visible control buttons of the player.

Assign output of os.system to a variable and prevent it from being displayed on the screen

from os import system, remove
from uuid import uuid4

def bash_(shell_command: str) -> tuple:
    """

    :param shell_command: your shell command
    :return: ( 1 | 0, stdout)
    """

    logfile: str = '/tmp/%s' % uuid4().hex
    err: int = system('%s &> %s' % (shell_command, logfile))
    out: str = open(logfile, 'r').read()
    remove(logfile)
    return err, out

# Example: 
print(bash_('cat /usr/bin/vi | wc -l'))
>>> (0, '3296\n')```

After submitting a POST form open a new window showing the result

var urlAction = 'whatever.php';
var data = {param1:'value1'};

var $form = $('<form target="_blank" method="POST" action="' + urlAction + '">');
$.each(data, function(k,v){
    $form.append('<input type="hidden" name="' + k + '" value="' + v + '">');
});
$form.submit();

How to use regex in file find

Use -regex not -name, and be aware that the regex matches against what find would print, e.g. "/home/test/test.log" not "test.log"

PHP file_get_contents() and setting request headers

If you don't need HTTPS and curl is not available on your system you could use fsockopen

This function opens a connection from which you can both read and write like you would do with a normal file handle.

How do I URl encode something in Node.js?

The built-in module querystring is what you're looking for:

var querystring = require("querystring");
var result = querystring.stringify({query: "SELECT name FROM user WHERE uid = me()"});
console.log(result);
#prints 'query=SELECT%20name%20FROM%20user%20WHERE%20uid%20%3D%20me()'

LEFT function in Oracle

I've discovered that LEFT and RIGHT are not supported functions in Oracle. They are used in SQL Server, MySQL, and some other versions of SQL. In Oracle, you need to use the SUBSTR function. Here are simple examples:

LEFT ('Data', 2) = 'Da'

->   SUBSTR('Data',1,2) = 'Da'

RIGHT ('Data', 2) = 'ta'

->   SUBSTR('Data',-2,2) = 'ta'

Notice that a negative number counts back from the end.

How do I find the value of $CATALINA_HOME?

Tomcat can tell you in several ways. Here's the easiest:

 $ /path/to/catalina.sh version
Using CATALINA_BASE:   /usr/local/apache-tomcat-7.0.29
Using CATALINA_HOME:   /usr/local/apache-tomcat-7.0.29
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-7.0.29/temp
Using JRE_HOME:        /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
Using CLASSPATH:       /usr/local/apache-tomcat-7.0.29/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.29/bin/tomcat-juli.jar
Server version: Apache Tomcat/7.0.29
Server built:   Jul 3 2012 11:31:52
Server number:  7.0.29.0
OS Name:        Mac OS X
OS Version:     10.7.4
Architecture:   x86_64
JVM Version:    1.6.0_33-b03-424-11M3720
JVM Vendor:     Apple Inc.

If you don't know where catalina.sh is (or it never gets called), you can usually find it via ps:

$ ps aux | grep catalina
chris            930   0.0  3.1  2987336 258328 s000  S    Wed01PM   2:29.43 /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/java -Dnop -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.library.path=/usr/local/apache-tomcat-7.0.29/lib -Djava.endorsed.dirs=/usr/local/apache-tomcat-7.0.29/endorsed -classpath /usr/local/apache-tomcat-7.0.29/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.29/bin/tomcat-juli.jar -Dcatalina.base=/Users/chris/blah/blah -Dcatalina.home=/usr/local/apache-tomcat-7.0.29 -Djava.io.tmpdir=/Users/chris/blah/blah/temp org.apache.catalina.startup.Bootstrap start

From the ps output, you can see both catalina.home and catalina.base. catalina.home is where the Tomcat base files are installed, and catalina.base is where the running configuration of Tomcat exists. These are often set to the same value unless you have configured your Tomcat for multiple (configuration) instances to be launched from a single Tomcat base install.

You can also interrogate the JVM directly if you can't find it in a ps listing:

$ jinfo -sysprops 930 | grep catalina
Attaching to process ID 930, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 20.8-b03-424
catalina.base = /Users/chris/blah/blah
[...]
catalina.home = /usr/local/apache-tomcat-7.0.29

If you can't manage that, you can always try to write a JSP that dumps the values of the two system properties catalina.home and catalina.base.

Why doesn't RecyclerView have onItemClickListener()?

How to put it all together example...

onClick() handling
Cursor - RecyclerView

ViewHolder types

public class OrderListCursorAdapter extends CursorRecyclerViewAdapter<OrderListCursorAdapter.ViewHolder> {

private static final String TAG = OrderListCursorAdapter.class.getSimpleName();
private static final int ID_VIEW_HOLDER_ACTUAL = 0;
private static final int ID_VIEW_HOLDER = 1;

public OrderListCursorAdapter(Context context, Cursor cursor) {
    super(context, cursor);
}

public static class ViewHolderActual extends ViewHolder {
    private static final String TAG = ViewHolderActual.class.getSimpleName();
    protected IViewHolderClick listener;
    protected Button button;

    public ViewHolderActual(View v, IViewHolderClick listener) {
        super(v, listener);
        this.listener = listener;
        button = (Button) v.findViewById(R.id.orderList_item_button);
        button.setOnClickListener(this);
    }

    public void initFromData(OrderData data) {
        Log.d(TAG, "><initFromData(data=" + data + ")");
        orderId = data.getId();
        vAddressStart.setText(data.getAddressStart());
        vAddressEnd.setText(data.getAddressEnd());
    }

    @Override
    public void onClick(View view) {
        if (view instanceof Button) {
            listener.onButtonClick((Button) view, getPosition(), this);
        } else {
            super.onClick(view);
        }
    }

    public interface IViewHolderClick extends ViewHolder.IViewHolderClick {
        public void onButtonClick(Button button, int position, ViewHolder viewHolder);
    }
}

public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private static final String TAG = ViewHolder.class.getSimpleName();
    protected long orderId;
    protected IViewHolderClick listener;
    protected TextView vAddressStart;
    protected TextView vAddressEnd;
    protected TextView vStatus;

    public ViewHolder(View v, IViewHolderClick listener) {
        super(v);
        this.listener = listener;
        v.setOnClickListener(this);

        vAddressStart = (TextView) v.findViewById(R.id.addressStart);
        vAddressEnd = (TextView) v.findViewById(R.id.addressEnd);
        vStatus = (TextView) v.findViewById(R.id.status);
    }

    public void initFromData(OrderData data) {
        Log.d(TAG, "><initFromData(data=" + data + ")");
        orderId = data.getId();
        vAddressStart.setText(data.getAddressStart());
        vAddressEnd.setText(data.getAddressEnd());
    }

    public long getOrderId() {
        return orderId;
    }

    @Override
    public void onClick(View view) {
        listener.onCardClick(view, getPosition(), this);
    }

    public interface IViewHolderClick {
        public void onCardClick(View view, int position, ViewHolder viewHolder);
    }
}

@Override
public int getItemViewType(int position) {
    return position == 0 ? ID_VIEW_HOLDER_ACTUAL : ID_VIEW_HOLDER;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    Log.d(TAG, ">>onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")");

    ViewHolder result;

    switch (viewType) {
        case ID_VIEW_HOLDER_ACTUAL: {
            View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout_actual, parent, false);
            result = new ViewHolderActual(itemView, new ViewHolderActual.IViewHolderClick() {
                @Override
                public void onCardClick(View view, int position, ViewHolder viewHolder) {
                    Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")");
                    Intent intent = new Intent(view.getContext(), OrderDetailActivity.class);
                    intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId());
                    view.getContext().startActivity(intent);
                }

                @Override
                public void onButtonClick(Button button, int position, ViewHolder viewHolder) {
                    Log.d(TAG, "><onButtonClick(button=" + button + ", position=" + position + ", viewHolder=" + viewHolder + ")");
                    Intent intent = new Intent(button.getContext(), OrderMapActivity.class);
                    intent.putExtra(OrderMapActivity.ARG_ORDER_ID, viewHolder.getOrderId());
                    button.getContext().startActivity(intent);
                }
            });
            break;
        }
        case ID_VIEW_HOLDER:
        default: {
            View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout, parent, false);
            result = new ViewHolder(itemView, new ViewHolder.IViewHolderClick() {
                @Override
                public void onCardClick(View view, int position, ViewHolder viewHolder) {
                    Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")");
                    Intent intent = new Intent(view.getContext(), OrderDetailActivity.class);
                    intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId());
                    view.getContext().startActivity(intent);
                }
            });
            break;
        }
    }

    Log.d(TAG, "<<onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")= " + result);
    return result;
}

@Override
public void onBindViewHolder(ViewHolder viewHolder, Cursor cursor) {
    Log.d(TAG, "><onBindViewHolder(viewHolder=" + viewHolder + ", cursor=" + cursor + ")");
    final OrderData orderData = new OrderData(cursor);
    viewHolder.initFromData(orderData);
}
}

How do you produce a .d.ts "typings" definition file from an existing JavaScript library?

Here is some PowerShell that creates a single TypeScript definition file a library that includes multiple *.js files with modern JavaScript.

First, change all the extensions to .ts.

Get-ChildItem | foreach { Rename-Item $_ $_.Name.Replace(".js", ".ts") }

Second, use the TypeScript compiler to generate definition files. There will be a bunch of compiler errors, but we can ignore those.

Get-ChildItem | foreach { tsc $_.Name  }

Finally, combine all the *.d.ts files into one index.d.ts, removing the import statements and removing the default from each export statement.

Remove-Item index.d.ts; 

Get-ChildItem -Path *.d.ts -Exclude "Index.d.ts" | `
  foreach { Get-Content $_ } | `
  where { !$_.ToString().StartsWith("import") } | `
  foreach { $_.Replace("export default", "export") } | `
  foreach { Add-Content index.d.ts $_ }

This ends with a single, usable index.d.ts file that includes many of the definitions.

Decimal separator comma (',') with numberDecimal inputType in EditText

You could do the following:

DecimalFormatSymbols d = DecimalFormatSymbols.getInstance(Locale.getDefault());
input.setFilters(new InputFilter[] { new DecimalDigitsInputFilter(5, 2) });
input.setKeyListener(DigitsKeyListener.getInstance("0123456789" + d.getDecimalSeparator()));

And then you could use an input filter:

    public class DecimalDigitsInputFilter implements InputFilter {

Pattern mPattern;

public DecimalDigitsInputFilter(int digitsBeforeZero, int digitsAfterZero) {
    DecimalFormatSymbols d = new DecimalFormatSymbols(Locale.getDefault());
    String s = "\\" + d.getDecimalSeparator();
    mPattern = Pattern.compile("[0-9]{0," + (digitsBeforeZero - 1) + "}+((" + s + "[0-9]{0," + (digitsAfterZero - 1) + "})?)||(" + s + ")?");
}

@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {

    Matcher matcher = mPattern.matcher(dest);
    if (!matcher.matches())
        return "";
    return null;
}

}

Use jQuery to get the file input's selected filename without the path

Here you can call like this Let this is my Input File control

  <input type="file" title="search image" id="file" name="file" onchange="show(this)"  />

Now here is my Jquery which get called once you select the file

<script type="text/javascript">
    function show(input) {
        var fileName = input.files[0].name;
        alert('The file "' + fileName + '" has been selected.');               
            }

</script>

jQuery lose focus event

Use blur event to call your function when element loses focus :

$('#filter').blur(function() {
  $('#options').hide();
});

Add and Remove Views in Android Dynamically?

ViewGroup class provides API for child views management in run-time, allowing to add/remove views as well.

Some other links on the subject:

Android, add new view without XML Layout

Android Runtime Layout Tutorial

http://developer.android.com/reference/android/view/View.html

http://developer.android.com/reference/android/widget/LinearLayout.html

Material UI and Grid system

I looked around for an answer to this and the best way I found was to use Flex and inline styling on different components.

For example, to make two paper components divide my full screen in 2 vertical components (in ration of 1:4), the following code works fine.

const styles = {
  div:{
    display: 'flex',
    flexDirection: 'row wrap',
    padding: 20,
    width: '100%'
  },
  paperLeft:{
    flex: 1,
    height: '100%',
    margin: 10,
    textAlign: 'center',
    padding: 10
  },
  paperRight:{
    height: 600,
    flex: 4,
    margin: 10,
    textAlign: 'center',
  }
};

class ExampleComponent extends React.Component {
  render() {
    return (
      <div>
        <div style={styles.div}>
          <Paper zDepth={3} style={styles.paperLeft}>
            <h4>First Vertical component</h4>
          </Paper>
          <Paper zDepth={3} style={styles.paperRight}>
              <h4>Second Vertical component</h4>
          </Paper>
        </div>
      </div>
    )
  }
}

Now, with some more calculations, you can easily divide your components on a page.

How to download/upload files from/to SharePoint 2013 using CSOM?

File.OpenBinaryDirect may cause exception when you are using Oauth accestoken Explained in This Article

Code should be written as below to avoid exceptions

 Uri filename = new Uri(filepath);
        string server = filename.AbsoluteUri.Replace(filename.AbsolutePath, 
         "");
        string serverrelative = filename.AbsolutePath;

        Microsoft.SharePoint.Client.File file = 
        this.ClientContext.Web.GetFileByServerRelativeUrl(serverrelative);
        this.ClientContext.Load(file);
        ClientResult<Stream> streamResult = file.OpenBinaryStream();
        this.ClientContext.ExecuteQuery();
        return streamResult.Value;

How to convert R Markdown to PDF?

Only two steps:

Install the latest release "pandoc" from here:

https://github.com/jgm/pandoc/releases

Call the function pandoc in the library(knitr)

library(knitr)
pandoc('input.md', format = 'latex')

Thus, you can convert your "input.md" into "input.pdf".

Warnings Your Apk Is Using Permissions That Require A Privacy Policy: (android.permission.READ_PHONE_STATE)

If you're testing your app on a device > android 6.0 you have also to explicitely ask the user to grant the permission.

As you can see here READ_PHONE_STATE have a dangerous level.

If a permission have a dangerous level then the user have to accept or not this permission manually. You don't have the choice, you MUST do this

To do this from your activity execute the following code :

if the user use Android M and didn't grant the permission yet it will ask for it.

public static final int READ_PHONE_STATE_PERMISSION = 100;

  if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_PHONE_STATE)
                != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(new String[]{Manifest.permission.READ_PHONE_STATE}, READ_PHONE_STATE_PERMISSION);
        }

then override onRequestPermissionsResult in your activity

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case READ_PHONE_STATE_PERMISSION: {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    //Permission granted do what you want from this point
                }else {
                    //Permission denied, manage this usecase
                }
            }
        }
    }

You should read this article to know more about it

Difference between request.getSession() and request.getSession(true)

A major practical difference is its use:

in security scenario where we always needed a new session, we should use request.getSession(true).

request.getSession(false): will return null if no session found.

Clicking URLs opens default browser

in some cases you might need an override of onLoadResource if you get a redirect which doesn't trigger the url loading method. in this case i tried the following:

@Override
public void onLoadResource(WebView view, String url)
{
    if (url.equals("http://redirectexample.com"))
    {
        //do your own thing here
    }
    else
    {
        super.onLoadResource(view, url);
    }           
}

How to generate a number of most distinctive colors in R?

You can generate a set of colors like this:

myCol = c("pink1", "violet", "mediumpurple1", "slateblue1", "purple", "purple3",
          "turquoise2", "skyblue", "steelblue", "blue2", "navyblue",
          "orange", "tomato", "coral2", "palevioletred", "violetred", "red2",
          "springgreen2", "yellowgreen", "palegreen4",
          "wheat2", "tan", "tan2", "tan3", "brown",
          "grey70", "grey50", "grey30")

These colors are as distinct as possible. For those similar colors, they form a gradient so that you can easily tell the differences between them.

How to workaround 'FB is not defined'?

For people who still got this FB bug, I use this cheeky fix to this problem.

Instead of http://connect.facebook.net/en_US/all.js, I used HTTPS and changed it into https://connect.facebook.net/en_US/all.js and it fixed my problem.

Package structure for a Java project?

You could follow maven's standard project layout. You don't have to actually use maven, but it would make the transition easier in the future (if necessary). Plus, other developers will be used to seeing that layout, since many open source projects are layed out this way,

getting the screen density programmatically in android?

This should work.

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels; //320
int height = dm.heightPixels; //480

jQuery UI - Draggable is not a function?

I had the same problem for another reason and my eye needed one hour to find out. I had copy-pasted the script tags that load jquery :

<script src="**https**://code.jquery.com/jquery-3.2.1.min.js"></script>
<script src="**http**://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>

My website was using https when accessed from a mobile browser and refused to load jquery-ui without https.

Difference between array_push() and $array[] =

both are the same, but array_push makes a loop in it's parameter which is an array and perform $array[]=$element

How can I generate a list of files with their absolute path in Linux?

Most if not all of the suggested methods result in paths that cannot be used directly in some other terminal command if the path contains spaces. Ideally the results will have slashes prepended. This works for me on macOS:

find / -iname "*SEARCH TERM spaces are okay*" -print 2>&1  | grep -v denied |grep -v permitted |sed -E 's/\ /\\ /g'

Remove duplicated rows using dplyr

If you want to find the rows that are duplicated you can use find_duplicates from hablar:

library(dplyr)
library(hablar)

df <- tibble(a = c(1, 2, 2, 4),
             b = c(5, 2, 2, 8))

df %>% find_duplicates()

Make error: missing separator

This is a syntax error in your Makefile. It's quite hard to be more specific than that, without seeing the file itself, or relevant portion(s) thereof.

CSS Circle with border

Try this:

.circle {
    height: 20px;
    width: 20px;
    padding: 5px;
    text-align: center; 
    border-radius: 50%;
    display: inline-block;
    color:#fff;
    font-size:1.1em;
    font-weight:600;
    background-color: rgba(0,0,0,0.1);
    border: 1px solid rgba(0,0,0,0.2);
}

Android - implementing startForeground for a service?

@mikebertiean solution almost did the trick, but I had this problem with additional twist -- I use Gingerbread system and I didn't want to add some extra package just to run notification. Finally I found: https://android.googlesource.com/platform/frameworks/support.git+/f9fd97499795cd47473f0344e00db9c9837eea36/v4/gingerbread/android/support/v4/app/NotificationCompatGingerbread.java

then I hit additional problem -- notification simply kills my app when it runs (how to solve this problem: Android: How to avoid that clicking on a Notification calls onCreate()), so in total my code in service looks like this (C#/Xamarin):

Intent notificationIntent = new Intent(this, typeof(MainActivity));
// make the changes to manifest as well
notificationIntent.SetFlags(ActivityFlags.ClearTop | ActivityFlags.SingleTop);
PendingIntent pendingIntent = PendingIntent.GetActivity(this, 0, notificationIntent, 0);
Notification notification = new Notification(Resource.Drawable.Icon, "Starting service");
notification.SetLatestEventInfo(this, "MyApp", "Monitoring...", pendingIntent);
StartForeground(1337, notification);

How do I create a new branch?

In the Repository Browser of TortoiseSVN, find the branch that you want to create the new branch from. Right-click, Copy To.... and enter the new branch path. Now you can "switch" your local WC to that branch.

How to read all files in a folder from Java?

void getFiles(){
        String dirPath = "E:/folder_name";
        File dir = new File(dirPath);
        String[] files = dir.list();
        if (files.length == 0) {
            System.out.println("The directory is empty");
        } else {
            for (String aFile : files) {
                System.out.println(aFile);
            }
        }
    }

how to make UITextView height dynamic according to text length?

Swift 4+

This is extremely easy with autolayout! I'll explain the most simple use case. Let's say there is only a UITextView in your UITableViewCell.

Fit the textView to the contentView with constraints.
Disable scrolling for the textView.
Update the tableView on textViewDidChange.

That's all!

protocol TextViewUpdateProtocol {
    func textViewChanged()
}

class TextViewCell: UITableViewCell {
    
    //MARK: Reuse ID
    static let identifier = debugDescription()
    
    //MARK: UI Element(s)
    /// Reference of the parent table view so that it can be updated
    var textViewUpdateDelegate: TextViewUpdateProtocol!
    
    lazy var textView: UITextView = {
        let textView = UITextView()
        textView.isScrollEnabled = false
        textView.delegate = self
        textView.layer.borderColor = UIColor.lightGray.cgColor
        textView.layer.borderWidth = 1
        textView.translatesAutoresizingMaskIntoConstraints = false
        return textView
    }()
    
    //MARK: Padding Variable(s)
    let padding: CGFloat = 50
    
    //MARK: Initializer(s)
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        addSubviews()
        addConstraints()
        
        textView.becomeFirstResponder()
    }
    
    //MARK: Helper Method(s)
    func addSubviews() {
        contentView.addSubview(textView)
    }
    
    func addConstraints() {
        textView.leadingAnchor  .constraint(equalTo: contentView.leadingAnchor, constant: padding).isActive = true
        textView.trailingAnchor .constraint(equalTo: contentView.trailingAnchor, constant: -padding).isActive = true
        textView.topAnchor      .constraint(equalTo: contentView.topAnchor, constant: padding).isActive = true
        textView.bottomAnchor   .constraint(equalTo: contentView.bottomAnchor, constant: -padding).isActive = true
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
}

extension TextViewCell: UITextViewDelegate {
    
    func textViewDidChange(_ textView: UITextView) {
        textViewUpdateDelegate.textViewChanged()
    }
    
}

Now you have to inherit implement the protocol in your ViewController.

extension ViewController: TextViewUpdateProtocol {
    
    func textViewChanged() {
        tableView.beginUpdates()
        tableView.endUpdates()
    }
    
}

Check out my repo for the full implementation.

Parse RSS with jQuery

jQuery Feeds is a nice option, it has a built-in templating system and uses the Google Feed API, so it has cross-domain support.

Which @NotNull Java annotation should I use?

While waiting for this to be sorted out upstream (Java 8?), you could also just define your own project-local @NotNull and @Nullable annotations. This can be useful also in case you're working with Java SE, where javax.validation.constraints isn't available by default.

import java.lang.annotation.*;

/**
 * Designates that a field, return value, argument, or variable is
 * guaranteed to be non-null.
 */
@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
@Documented
@Retention(RetentionPolicy.CLASS)
public @interface NotNull {}

/**
 * Designates that a field, return value, argument, or variable may be null.
 */
@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
@Documented
@Retention(RetentionPolicy.CLASS)
public @interface Nullable {}

This would admittedly largely be for decorative or future-proofing purposes, since the above obviously doesn't in and of itself add any support for the static analysis of these annotations.

Can you use @Autowired with static fields?

In short, no. You cannot autowire or manually wire static fields in Spring. You'll have to write your own logic to do this.

JavaScript equivalent to printf/String.Format

I use this simple function:

String.prototype.format = function() {
    var formatted = this;
    for( var arg in arguments ) {
        formatted = formatted.replace("{" + arg + "}", arguments[arg]);
    }
    return formatted;
};

That's very similar to string.format:

"{0} is dead, but {1} is alive!".format("ASP", "ASP.NET")

Allow user to select camera or gallery for image

I found this. Using:

galleryIntent.setType("image/*");
galleryIntent.setAction(Intent.ACTION_GET_CONTENT);

for one of the intents shows the user the option of selecting 'documents' in Android 4, which I found very confusing. Using this instead shows the 'gallery' option:

Intent pickIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

Capture the screen shot using .NET

It's certainly possible to grab a screenshot using the .NET Framework. The simplest way is to create a new Bitmap object and draw into that using the Graphics.CopyFromScreen method.

Sample code:

using (Bitmap bmpScreenCapture = new Bitmap(Screen.PrimaryScreen.Bounds.Width, 
                                            Screen.PrimaryScreen.Bounds.Height))
using (Graphics g = Graphics.FromImage(bmpScreenCapture))
{
    g.CopyFromScreen(Screen.PrimaryScreen.Bounds.X,
                     Screen.PrimaryScreen.Bounds.Y,
                     0, 0,
                     bmpScreenCapture.Size,
                     CopyPixelOperation.SourceCopy);
}

Caveat: This method doesn't work properly for layered windows. Hans Passant's answer here explains the more complicated method required to get those in your screen shots.

Add horizontal scrollbar to html table

Use the CSS attribute "overflow" for this.

Short summary:

overflow: visible|hidden|scroll|auto|initial|inherit;

e.g.

table {
    display: block;
    overflow: scroll;
}

What's a clean way to stop mongod on Mac OS X?

I prefer to stop the MongoDB server using the port command itself.

sudo port unload mongodb

And to start it again.

sudo port load mongodb

How to clear browsing history using JavaScript?

As MDN Window.history() describes :

For top-level pages you can see the list of pages in the session history, accessible via the History object, in the browser's dropdowns next to the back and forward buttons.

For security reasons the History object doesn't allow the non-privileged code to access the URLs of other pages in the session history, but it does allow it to navigate the session history.

There is no way to clear the session history or to disable the back/forward navigation from unprivileged code. The closest available solution is the location.replace() method, which replaces the current item of the session history with the provided URL.

So there is no Javascript method to clear the session history, instead, if you want to block navigating back to a certain page, you can use the location.replace() method, and pass the page link as parameter, which will not push the page to the browser's session history list. For example, there are three pages:

a.html:

<!doctype html>
<html>
    <head>
        <title>a.html page</title>
    <meta charset="utf-8">
    </head>
    <body>
         <p>This is <code style="color:red">a.html</code> page ! Go to <a href="b.html">b.html</a> page !</p>        
    </body>
 </html>

b.html:

<!doctype html>
<html>
    <head>
    <title>b.html page</title>
    <meta charset="utf-8">
</head>
<body>
    <p>This is <code style="color:red">b.html</code> page ! Go to <a id="jumper" href="c.html">c.html</a> page !</p>

    <script type="text/javascript">
        var jumper = document.getElementById("jumper");
        jumper.onclick = function(event) {
            var e = event || window.event ;
            if(e.preventDefault) {
                e.preventDefault();
            } else {
                e.returnValue = true ;
            }
            location.replace(this.href);
            jumper = null;
        }
    </script>
</body>

c.html:

<!doctype html>
<html>
<head>
    <title>c.html page</title>
    <meta charset="utf-8">
</head>
<body>
    <p>This is <code style="color:red">c.html</code> page</p>
</body>
</html>

With href link, we can navigate from a.html to b.html to c.html. In b.html, we use the location.replace(c.html) method to navigate from b.html to c.html. Finally, we go to c.html*, and if we click the back button in the browser, we will jump to **a.html.

So this is it! Hope it helps.

Bootstrap: wider input field

Use the bootstrap built in classes input-large, input-medium, ... : <input type="text" class="input-large search-query">

Or use your own css:

Give the element a unique classname class="search-query input-mysize"
Add this in your css file (not the bootstrap.less or css files):
.input-mysize { width: 150px }

how to restart only certain processes using supervisorctl?

Any way to replace characters on Swift String?

Xcode 11 • Swift 5.1

The mutating method of StringProtocol replacingOccurrences can be implemented as follow:

extension RangeReplaceableCollection where Self: StringProtocol {
    mutating func replaceOccurrences<Target: StringProtocol, Replacement: StringProtocol>(of target: Target, with replacement: Replacement, options: String.CompareOptions = [], range searchRange: Range<String.Index>? = nil) {
        self = .init(replacingOccurrences(of: target, with: replacement, options: options, range: searchRange))
    }
}

var name = "This is my string"
name.replaceOccurrences(of: " ", with: "+")
print(name) // "This+is+my+string\n"

How do I add a newline to a TextView in Android?

I just solve the same problem, put below attributes in xml

android:lines="2" android:maxLines="4" android:singleLine="false"

work.Html.fromHtml("text1 <br> text2").toString() also work.

Regular Expression for any number greater than 0?

The simple answer is: ^[1-9][0-9]*$

How to Use pdf.js

How do detect Android Tablets in general. Useragent?

Based on Agents strings on this site:

http://www.webapps-online.com/online-tools/user-agent-strings

This results came up:
First:

All Tablet Devices have:
1. Tablet
2. iPad

Second:

All Phone Devices have:
1. Mobile
2. Phone

Third:

Tablet and Phone Devices have:
1. Android

If you can detect level by level, I thing the result is 90 percent true. Like SharePoint Device Channels.

PDF to image using Java

Apache PDF Box can convert PDFs to jpg,bmp,wbmp,png, and gif.

The library even comes with a command line utility called PDFToImage to do this.

If you download the source code and look at the PDFToImage class you should be able to figure out how to use PDF Box to convert PDFs to images from your own Java code.

Allow click on twitter bootstrap dropdown toggle link?

This can be done simpler by adding two links, one with text and href and one with the dropdown and caret:

<a href="{{route('posts.index')}}">Posts</a>
<a href="{{route('posts.index')}}" class="dropdown-toggle" data-toggle="dropdown" role="link" aria-haspopup="true" aria- expanded="false"></a>
<ul class="dropdown-menu navbar-inverse bg-inverse">
    <li><a href="{{route('posts.create')}}">Create</a></li>
</ul>

Now you click the caret for dropdown and the link as a link. No css or js needed. I use Bootstrap 4 4.0.0-alpha.6, defining the caret is not necessary, it appears without the html.

Python re.sub(): how to substitute all 'u' or 'U's with 'you'

Firstly, why doesn't your solution work. You mix up a lot of concepts. Mostly character class with other ones. In the first character class you use | which stems from alternation. In character classes you don't need the pipe. Just list all characters (and character ranges) you want:

[Uu]

Or simply write u if you use the case-insensitive modifier. If you write a pipe there, the character class will actually match pipes in your subject string.

Now in the second character class you use the comma to separate your characters for some odd reason. That does also nothing but include commas into the matchable characters. s and W are probably supposed to be the built-in character classes. Then escape them! Otherwise they will just match literal s and literal W. But then \W already includes everything else you listed there, so a \W alone (without square brackets) would have been enough. And the last part (^a-zA-Z) also doesn't work, because it will simply include ^, (, ) and all letters into the character class. The negation syntax only works for entire character classes like [^a-zA-Z].

What you actually want is to assert that there is no letter in front or after your u. You can use lookarounds for that. The advantage is that they won't be included in the match and thus won't be removed:

r'(?<![a-zA-Z])[uU](?![a-zA-Z])'

Note that I used a raw string. Is generally good practice for regular expressions, to avoid problems with escape sequences.

These are negative lookarounds that make sure that there is no letter character before or after your u. This is an important difference to asserting that there is a non-letter character around (which is similar to what you did), because the latter approach won't work at the beginning or end of the string.

Of course, you can remove the spaces around you from the replacement string.

If you don't want to replace u that are next to digits, you can easily include the digits into the character classes:

r'(?<![a-zA-Z0-9])[uU](?![a-zA-Z0-9])'

And if for some reason an adjacent underscore would also disqualify your u for replacement, you could include that as well. But then the character class coincides with the built-in \w:

r'(?<!\w)[uU](?!\w)'

Which is, in this case, equivalent to EarlGray's r'\b[uU]\b'.

As mentioned above you can shorten all of these, by using the case-insensitive modifier. Taking the first expression as an example:

re.sub(r'(?<![a-z])u(?![a-z])', 'you', text, flags=re.I)

re.sub(r'(?<![a-z])u(?![a-z])', 'you', text, flags=re.IGNORECASE)

depending on your preference.

I suggest that you do some reading through the tutorial I linked several times in this answer. The explanations are very comprehensive and should give you a good headstart on regular expressions, which you will probably encounter again sooner or later.

How to get an object's methods?

function getMethods(obj)
{
    var res = [];
    for(var m in obj) {
        if(typeof obj[m] == "function") {
            res.push(m)
        }
    }
    return res;
}

-XX:MaxPermSize with or without -XX:PermSize

If you're doing some performance tuning it's often recommended to set both -XX:PermSize and -XX:MaxPermSize to the same value to increase JVM efficiency.

Here is some information:

You can also specify -XX:+CMSClassUnloadingEnabled to enable class unloading option if you are using CMS GC. It may help to decrease the probability of Java.lang.OutOfMemoryError: PermGen space

Assembly - JG/JNLE/JL/JNGE after CMP

The command JG simply means: Jump if Greater. The result of the preceding instructions is stored in certain processor flags (in this it would test if ZF=0 and SF=OF) and jump instruction act according to their state.

Writing files in Node.js

Point 1:

If you want to write something into a file. means: it will remove anything already saved in the file and write the new content. use fs.promises.writeFile()

Point 2:

If you want to append something into a file. means: it will not remove anything already saved in the file but append the new item in the file content.then first read the file, and then add the content into the readable value, then write it to the file. so use fs.promises.readFile and fs.promises.writeFile()

example 1: I want to write a JSON object in my JSON file .

const fs = require('fs');

writeFile (filename ,writedata) async function writeFile (filename ,writedata) { try { await fs.promises.writeFile(filename, JSON.stringify(writedata,null, 4), 'utf8'); return true } catch(err) { return false } }

How to increase buffer size in Oracle SQL Developer to view all records?

Select Tools > Preferences > Database / Advanced

There is an input field for Sql Array Fetch Size but it only allows setting a max of 500 rows.

How can git be installed on CENTOS 5.5?

If you are using CentOS the built in yum repositories don't seem to have git included and as such, you will need to add an additional repository to the system. For my servers I found that the Webtatic repository seems to be reasonably up to date and the installation for git will then be as follows:

# Add the repository
rpm -Uvh http://repo.webtatic.com/yum/centos/5/latest.rpm

# Install the latest version of git
yum install --enablerepo=webtatic git-all

To work around Missing Dependency: perl(Git) errors:

yum install --enablerepo=webtatic --disableexcludes=main  git-all

Firebase Permission Denied

Open firebase, select database on the left hand side.
Now on the right hand side, select [Realtime database] from the drown and change the rules to:

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

What's the difference between session.persist() and session.save() in Hibernate?

Here is the difference:

save:
1. will return the id/identifier when the object is saved to the database.
2. will also save when the object is tried to do the same by opening a new session after it is detached.
Persist:
1. will return void when the object is saved to the database.
2. will throw PersistentObjectException when tried to save the detached object through a new session.

CS1617: Invalid option ‘6’ for /langversion; must be ISO-1, ISO-2, 3, 4, 5 or Default

This happened to me when I pulled down my repo after moving it to a new location. The solution was to unload and then reload each project that was showing this error.

I tried a few other options but nothing worked for me. Also in this situation my config files were set to use languageversion 6, so setting them to default did not fix the issue.

How to get date in BAT file

This will give you DD MM YYYY YY HH Min Sec variables and works on any Windows machine from XP Pro and later.

@echo off
for /f "tokens=2 delims==" %%a in ('wmic OS Get localdatetime /value') do set "dt=%%a"
set "YY=%dt:~2,2%" & set "YYYY=%dt:~0,4%" & set "MM=%dt:~4,2%" & set "DD=%dt:~6,2%"
set "HH=%dt:~8,2%" & set "Min=%dt:~10,2%" & set "Sec=%dt:~12,2%"

set "datestamp=%YYYY%%MM%%DD%" & set "timestamp=%HH%%Min%%Sec%"
set "fullstamp=%YYYY%-%MM%-%DD%_%HH%-%Min%-%Sec%"
echo datestamp: "%datestamp%"
echo timestamp: "%timestamp%"
echo fullstamp: "%fullstamp%"
pause

SQLite with encryption/password protection

The .net library System.Data.SQLite also provides for encryption.

What is "with (nolock)" in SQL Server?

WITH (NOLOCK) is the equivalent of using READ UNCOMMITED as a transaction isolation level. So, you stand the risk of reading an uncommitted row that is subsequently rolled back, i.e. data that never made it into the database. So, while it can prevent reads being deadlocked by other operations, it comes with a risk. In a banking application with high transaction rates, it's probably not going to be the right solution to whatever problem you're trying to solve with it IMHO.

How to get the first column of a pandas DataFrame as a Series?

This works great when you want to load a series from a csv file

x = pd.read_csv('x.csv', index_col=False, names=['x'],header=None).iloc[:,0]
print(type(x))
print(x.head(10))


<class 'pandas.core.series.Series'>
0    110.96
1    119.40
2    135.89
3    152.32
4    192.91
5    177.20
6    181.16
7    177.30
8    200.13
9    235.41
Name: x, dtype: float64

Programs & Examples On #Webresource.axd

Adding machineKey to web.config on web-farm sites

Having links relative to root?

Razor MVC Populating Javascript array with Model Array

SQL Server: use CASE with LIKE

Angular 4 Pipe Filter

In Excel, how do I extract last four letters of a ten letter string?

What design patterns are used in Spring framework?

Force re-download of release dependency using Maven

How can I find last row that contains data in a specific column?

How to create a connection string in asp.net c#

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

PyCharm error: 'No Module' when trying to import own module (python script)

How to convert date into this 'yyyy-MM-dd' format in angular 2

Why do I need to configure the SQL dialect of a data source?

The zip() function in Python 3

Angular 4: no component factory found,did you add it to @NgModule.entryComponents?

How do I run a file on localhost?

Get table column names in MySQL?

How to connect to a remote MySQL database with Java?

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