Tutorial by Examples: an

Query to Copy/Move/Transafer table data from one database to other database table with same schema

First Execute CREATE EXTENSION DBLINK; Then INSERT INTO <SCHEMA_NAME>.<TABLE_NAME_1> SELECT * FROM DBLINK( 'HOST=<IP-ADDRESS> USER=<USERNAME> PASSWORD=<PASSWORD> DBNAME=<DATABASE>', 'SELECT * FROM <SCHEMA_NAME>.<TABLE_NAME_2...

Adding the Fingerprint Scanner in Android application

Android supports fingerprint api from Android 6.0 (Marshmallow) SDK 23 To use this feature in your app, first add the USE_FINGERPRINT permission in your manifest. <uses-permission android:name="android.permission.USE_FINGERPRINT" /> Here the procedure to follow ...

Disable animations during UI Testing

In a test you can disable animations by adding in setUp: app.launchEnvironment = ["animations": "0"] Where app is instance of XCUIApplication.

Lunch and Terminate application while executing

Lunch application for testing override func setUp() { super.setUp() let app = XCUIApplication() app.launch() } Terminating application func testStacOverFlowApp() { app.terminate() }

Advanced Options page

if( function_exists('acf_add_options_page') ) { acf_add_options_page(array( 'page_title' => 'Theme General Settings', 'menu_title' => 'Theme Settings', 'menu_slug' => 'theme-general-settings', 'capability' => 'edit_posts', ...

Fabric js canvas events Demo

<canvas id="c" width="400" height="400"></canvas> var canvas = new fabric.Canvas("c"); canvas.on('mouse:up', function () { console.log('Event mouse:up Triggered'); }); canvas.on('mouse:down', function () { console.log('Event mouse:d...

The BASH_ALIASES is an internal bash assoc array

Aliases are named shortcuts of commands, one can define and use in interactive bash instances. They are held in an associative array named BASH_ALIASES. To use this var in a script, it must be run within an interactive shell #!/bin/bash -li # note the -li above! -l makes this behave like a login s...

Generate Cryptographically Random Data

To generate samples of cryptographically random data: final byte[] sample = new byte[16]; new SecureRandom().nextBytes(sample); System.out.println("Sample: " + DatatypeConverter.printHexBinary(sample)); Produces output similar to: Sample: E4F14CEA2384F70B706B53A6DF8C5EFE Note...

Sanitize get_field() output

It's a good idea to sanitize get_field() output, especially when using Advanced Custom Fields fields front end (with acf_form()). Otherwise your site is likely vulnerable to cross-site scripting attacks (XSS). The following function lets you use echo get_field_escaped('my_custom_field', $post_id, ...

Compute and Verify Digital Signatures

To compute a signature: final PrivateKey privateKey = keyPair.getPrivate(); final byte[] data = "FOO BAR".getBytes(); final Signature signer = Signature.getInstance("SHA1withRSA"); signer.initSign(privateKey); signer.update(data); final byte[] signature = signer.sign();...

Kubectl in command line

After you have a running cluster you can manage it with the kubectl command. Most of the commands you can get with the kubectl --help command, but I show you the most common commands, for manage and getting info about your cluster, nodes, pods, services and labels. For getting information about t...

Changing delimiter

You can change the "$" delimiter to any other. The following example: from string import Template class MyOtherTemplate(Template): delimiter = "#" data = dict(id = 1, name = "Ricardo") t = MyOtherTemplate("My name is #name and I have the id: #id&quot...

Pan, zoom, and rotate with QGraphicsView

QGraphics can be used to organize complicated scenes of visual objects into a framework that makes them easier to handle. There are three major types of objects used in this framework QGraphicsView, QGraphicsScene, and QGraphicsItems. QGraphicsItems are the basic visual items that exist in the scen...

1. Standard String

In vbscript, an object doesn't necessarily need a designated type. Similar to C#'s var variable. Dim ExampleString1 As String Dim ExampleString2

2. String Manipulation Basics

'Base string Dim exStr : exStr = " <Head>data</Head> " 'Left Dim res: res = Left(exStr,6) 'res now equals " <Head" 'Right Dim res: res = Right(exStr,6) 'res now equals "Head> " 'Mid Dim res: res = Mid(exStr,8,4) 'res now equals "data&quot...

5. Populating array with specific text from string via start and end characters.

'Note: I use this method to extract non-html data in extracted GET telnet results 'This example effectively grabs every other vehicle that have start and finish 'characters, which in this case is "/". 'Resulting in an array like this: 'extractedData(0) = "/Jeep" 'extractedD...

4. Chaining string manipulation methods together.

Dim exStr : exStr = " <Head>data</Head> " Dim res res = Ucase(Replace(Mid(exStr, instr(exStr, ">")+1,4), "ata", "ark")) 'res now equals DARK 'instr(exStr, ">") returns 7 'Mid(" <Head>data</Head> ", 7+1,...

Using the PROMPT_COMMAND envrionment variable

When the last command in an interactive bash instance is done, the evaluated PS1 variable is displayes. Before actually displaying PS1 bash looks whether the PROMPT_COMMAND is set. This value of this var must be a callable program or script. If this var is set this program/script is called BEFORE th...

Advanced features of Exceptions

This example covers some advanced features and use-cases for Exceptions. Examining the callstack programmatically Java SE 1.4 The primary use of exception stacktraces is to provide information about an application error and its context so that the programmer can diagnose and fix the problem. Som...

In C++11 and later

C++11 offers tools that enhance the functionality of RAII-encapsulated OpenGL objects. Without C++11 features like move semantics, such objects would have to be dynamically allocated if you want to pass them around, since they cannot be copied. Move support allows them to be passed back and forth li...

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