Tutorial by Examples: et

Share information between different pages

One of the easiest examples of using shared services is when we want to store some data from a given page of our application, and then get that data again but from another page. One option could be to send that data as a parameter (for instance, if one page calls the other one) but if we want to us...

ionic2 • Using Services

Import data from RDBMS to HBase table

The following sqoop command will be used to import the data from RDBMS table into HBase table, if the table does not exists in HBase it will create a new table and import the data into this table sqoop import \ --query 'select emp_id, emp_name, emp_sal from employee where $CONDITIONS' \ ...

sqoop • Connecting Sqoop to other databases/datastores

Setup for Specflow

Pre -Requsite: Download Visual Studio IDE Create a new project Install specflow visual studio integration, Nunit Adapter & Nunit framework Download specflow for visual studio as shown below

specflow • Getting started with specflow

Hello Web (Basic "Hello World"-type setup)

<html> <head> <script src="https://code.jquery.com/jquery-3.1.0.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> <script src="https:...

backbone.js • Getting started with backbone.js

Installation or Setup

We have 2 way, we can install Universal app in windows 10 devices (OS/Phone). One app works for both mobile and OS 1 Install using Power Shell command Step 1: Make sure app not have any error and developed, then right click on Universal app project in solution explorer. Step 2: Select Store and C...

win-universal-app • Getting started with win-universal-app

Even more specific loop targeting

Let's say we want to change main loop, only for specific taxonomy, or post type. Targeting only main loop on book post type archive page. add_action( 'pre_get_posts', 'my_callback_function' ); function my_callback_function( $query ) { if( !$query->is_main_query() || is_admin() ) return;...

WordPress • Alternating main loop (pre_get_posts filter)

Pre get posts filter basic usage

Sometimes you would like to change main WordPress query. Filter pre_get_posts is the way to go. For example using pre_get_posts you can tell main loop to show only 5 posts. Or to show posts only from one category, or excluding any category etc. add_action( 'pre_get_posts', 'my_callback_function' ...

WordPress • Alternating main loop (pre_get_posts filter)

Singleton (Java)

Singletons in Java are very similar to C#, being as both languages are object orientated. Below is an example of a singleton class, where only one version of the object can be alive during the program's lifetime (Assuming the program works on one thread) public class SingletonExample { priva...

Design patterns • Singleton

Getting maximum and minimum

The Math.max() function returns the largest of zero or more numbers. Math.max(4, 12); // 12 Math.max(-1, -15); // -1 The Math.min() function returns the smallest of zero or more numbers. Math.min(4, 12); // 4 Math.min(-1, -15); // -15 Getting maximum and minimum from an array: var ...

JavaScript • Arithmetic (Math)

Convert UIImage to/from base64 encoding

Encoding //convert the image to NSData first let imageData:NSData = UIImagePNGRepresentation(image)! // convert the NSData to base64 encoding let strBase64:String = imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength) Decoding let dataDecoded:NSData = NSData(base64Encoded...

iOS • UIImage

TempDB database details

Below query can be used to get TempDB database details: USE [MASTER] SELECT * FROM sys.databases WHERE database_id = 2 OR USE [MASTER] SELECT * FROM sys.master_files WHERE database_id = 2 With the help of below DMV, you can check how much TempDb space does your session is using. This query...

Microsoft SQL Server • System database - TempDb

Complete Password Hashing Solution using Pbkdf2

using System; using System.Linq; using System.Security.Cryptography; namespace YourCryptoNamespace { /// <summary> /// Salted password hashing with PBKDF2-SHA1. /// Compatibility: .NET 3.0 and later. /// </summary> /// <remarks>See http://crackstation.net/h...

C# Language • Hash Functions

Get the attribute value of a HTML element

When a single parameter is passed to the .attr() function it returns the value of passed attribute on the selected element. Syntax: $([selector]).attr([attribute name]); Example: HTML: <a href="/home">Home</a> jQuery: $('a').attr('href'); Fetching data attributes: jQue...

jQuery • Attributes

Setting value of HTML attribute

If you want to add an attribute to some element you can use the attr(attributeName, attributeValue) function. For example: $('a').attr('title', 'Click me'); This example will add mouseover text "Click me" to all links on the page. The same function is used to change attributes' values...

jQuery • Attributes

Differece between attr() and prop()

attr() gets/sets the HTML attribute using the DOM functions getAttribute() and setAttribute(). prop() works by setting the DOM property without changing the attribute. In many cases the two are interchangeable, but occasionally one is needed over the other. To set a checkbox as checked: $('#tosAcc...

jQuery • Attributes

Changing the type of a primary key column

ALTER TABLE fish_data.fish DROP PRIMARY KEY; ALTER TABLE fish_data.fish MODIFY COLUMN fish_id DECIMAL(20,0) NOT NULL PRIMARY KEY; An attempt to modify the type of this column without first dropping the primary key would result in an error.

MySQL • ALTER TABLE

Paste the filename while in insert mode using the filename register

In Insert mode, press <C-r> and then % to insert the filename. This technique is applicable to all registers. For e.g. if in insert mode, you want to paste the current search pattern, you can type <C-r> and then /.

vim • Vim Registers

Communicating between Threads with `MVar`

It is very easy to pass information between threads using the MVar a type and its accompanying functions in Control.Concurrent: newEmptyMVar :: IO (MVar a) -- creates a new MVar a newMVar :: a -> IO (MVar a) -- creates a new MVar with the given value takeMVar :: MVar a -> IO a -- retrieve...

Haskell Language • Concurrency

C# MVVM Summary and Complete Example

Summary: MVVM is an architectural pattern that is represented by three distinct components, the Model, View and ViewModel. In order to understand these three layers, it is necessary to briefly define each, followed by an explanation of how they work together. Model is the layer that drives the bus...

mvvm • Getting started with mvvm

Avoid semicolon insertion on return statements

The JavaScript coding convention is to place the starting bracket of blocks on the same line of their declaration: if (...) { } function (a, b, ...) { } Instead of in the next line: if (...) { } function (a, b, ...) { } This has been adopted to avoid semicolon insertion ...

JavaScript • Automatic Semicolon Insertion - ASI