Tutorial by Examples: x

Let's define a grammar enabling us to perform additions, multiplications with the usage of parenthesis. To add more value to this example, we are going to compute the result of the arithmetic expression. Summary of the grammar: expression → times expression → times '+' expression times → elemen...

Step 1 – Install LAMP To start with Laravel, we first need to set up a running LAMP server. If you have already running LAMP stack skip this step else use followings commands to set up lamp on Ubuntu system. Install PHP 5.6 $ sudo apt-get install python-software-properties $ sudo add-apt-reposit...

public void OpenXmppConnection(int port, bool useSsl, string serverJid, string userName, string password) { try { _xmppClientConnection.AutoResolveConnectServer = true; _xmppClientConnection.Port = port; _xmppClien...

public class ConnectionManager { private XmppClientConnection _xmppClientConnection = null; public ConnectionManager() { if (_xmppClientConnection == null) { _xmppClientConnection = new ...

public class ConversationManager { #region ClassMemeber private XmppClientConnection _xmppClientConnection = null; public ConversationManager(XmppClientConnection con) { _xmppClientConnection = con...

In this example we will make a simple client and server with REQ-REP (request-reply) sockets. The client sends "Hello" to the server, which replies with "World". Server opens a ZeroMQ REP-socket on port 5555, reads requests on it, and replies with "World" to each reque...

this is the simple example of getting the hello world plain text message as output on calling the GET request. import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.core.MediaType; @Path("/hello") public class HelloExample { @GET...

Jsoup can be used to manipulate or extract data from a file on local that contains HTML. filePath is path of a file on disk. ENCODING is desired Charset Name e.g. "Windows-31J". It is optional. // load file File inputFile = new File(filePath); // parse file as HTML document ...

Step 1: Create your GitHub account If you already have a GitHub account, please proceed to Step 2. Otherwise, please follow below: 1.a Go to Github page. 1.b Enter your desired username, your email address and then your desired password. Afterwards, click the Sign up for GitHub button. Step 2:...

Note: For brevity, the commands use here-strings (<<<) and ANSI C-quoted strings ($'...'). Both these shell features work in bash, ksh, and zsh. # GNU Sed $ sed '1 a appended text' <<<'line 1' line 1 appended text # BSD Sed (multi-line form) sed '1 a\ appended text'...

The REGEXP (or its synonym, RLIKE) operator allows pattern matching based on regular expressions. Consider the following employee table: +-------------+-------------+-------------+--------------+----------+ | EMPLOYEE_ID | FIRST_NAME | LAST_NAME | PHONE_NUMBER | SALARY | +-------------+----...

If you care about your indices (yes, that's the plural of index), you should maintain them, especially if you do frequent inserts or deletes that affect them. Azure Automation provides an almost ready runbook that you can use and schedule to perform automated index rebuilding. Here's what you have ...

Example for a functional view to create an object. Excluding comments and blank lines, we need 15 lines of code: # imports from django.shortcuts import render_to_response from django.http import HttpResponseRedirect from .models import SampleObject from .forms import SampleObjectForm # vie...

The true power of generic views unfolds when you combine them with Mixins. A mixin is a just another class defined by you whose methods can be inherited by your view class. Assume you want every view to show the additional variable 'page_title' in the template. Instead of overriding the get_context...

cx_Freeze - a tool can package your project to excutable/installer after install it by pip, to package demo.py, we need setup.py below. import sys from cx_Freeze import setup, Executable # Dependencies are automatically detected, but it might need fine tuning. build_exe_options = { &...

The core idea of VLOOKUP is to look up information in a spreadsheet table and place it in another. For example, suppose this is the table in Sheet1: John 12/25/1990 Jane 1/1/2000 In Sheet2, place John, Andy, and Jane in A1, A2, and A3. In B1, to the right of John, I placed: =VL...

When creating a model for a table that has a composite primary key, additional work is required on the Object for the model Entity to respect those constraints. The following example SQL table and Entity demonstrates the structure to store a review left by a customer for an item in an online store....

public static string TextToHash(string text) { var sh = SHA1.Create(); var hash = new StringBuilder(); byte[] bytes = Encoding.UTF8.GetBytes(text); byte[] b = sh.ComputeHash(bytes); foreach (byte a in b) { var h = a.ToString(&...

After adding the GreenDao library dependency and Gradle plugin, we need to first create an entity object. Entity An entity is a Plain Old Java Object (POJO) that models some data in the database. GreenDao will use this class to create a table in the SQLite database and automatically generate helpe...

As stated above Functions are smaller procedures that contain small pieces of code which may be repetitive inside a Procedure. Functions are used to reduce redundancy in code. Similar to a Procedure, A function can be declared with or without an arguments list. Function is declared as a return ty...