Tutorial by Examples: d

Encrypt and Decrypt Data with Public / Private Keys

To encrypt data with a public key: final Cipher rsa = Cipher.getInstance("RSA"); rsa.init(Cipher.ENCRYPT_MODE, keyPair.getPublic()); rsa.update(message.getBytes()); final byte[] result = rsa.doFinal(); System.out.println("Message: " + message); System.out.println("...

Java Language • Security & Cryptography

Field Configuration

When adding custom fields to a Lucene index you can add new fields into the index using the following configuration: <configuration ref="contentSearch/indexConfigurations/defaultLuceneIndexConfiguration"> <indexAllfields>false</indexAllfields> <fieldNames hint=...

sitecore • Index configuration

Date and Time operators

There are basically two operators for date, datetime values. + and - are overloaded (probably a C term) to do date/datetime math: OperatorDescription+Adds days (date) or seconds (datetime) to a date/datetime value.-Gets the difference of two date/datetime values. Subtracts days (date) or seconds (d...

visual-foxpro • Operators

Rounded label with a custom renderer for Frame (PCL & iOS parts)

First step : PCL part using Xamarin.Forms; namespace ProjectNamespace { public class ExtendedFrame : Frame { /// <summary> /// The corner radius property. /// </summary> public static readonly BindableProperty CornerRadiusProperty = ...

Xamarin.Forms • Custom Renderers

ActiveForm Validations

You can enable/disable ajax and client validations in active form. $form = ActiveForm::begin([ 'id' => 'signup-form', 'enableClientValidation' => true, 'enableAjaxValidation' => true, 'validationUrl' => Url::to('signup'), ]); enableClientValidation is by defaul...

yii2 • Yii2 ActiveForm

Accessing Barometer to get relative altitude

Swift Import the Core Motion library: import CoreMotion Next, we need to create a CMAltimeter object, but a common pitfall is to create it in the viewDidLoad(). If done that way, the altimeter won’t be accessible when we need to call a method on it. Nevertheless, go ahead and create your CMAlti...

iOS • Core Motion

Override default response messages

Springfox defines a set default response messages that are applied to all API controllers by default. This includes e.g. 201 - Created and 204 - No Content, as well as several 40x responses. There might be cases, in which the default response messages don't apply for your API. You have to build-in p...

swagger • springfox

Sources and sinks

Sources and sinks are objects that know how to open streams. BytesCharsReadingByteSourceCharSourceWritingByteSinkCharSink Creating sources and sinks Note: for all examples, consider UTF_8 as if the following import is set: import static java.nio.charset.StandardCharsets.UTF_8; Reading from a ...

guava • I/O

Password Protect your VBA

Sometimes you have sensitive information in your VBA (e.g., passwords) that you don't want users to have access to. You can achieve basic security on this information by password-protecting your VBA project. Follow these steps: Open your Visual Basic Editor (Alt + F11) Navigate to Tools -> V...

excel-vba • VBA Security

Hide/Show HTML Elements

This example hide show html elements. <!DOCTYPE html> <html ng-app="myDemoApp"> <head> <script src="https://code.angularjs.org/1.5.8/angular.min.js"></script> <script> function HideShowController() { var vm = th...

AngularJS • Use of in-built directives

Building a composite index

In many situations, a composite index performs better than an index with a single column. To build an optimal composite index, populate it with columns in this order. = column(s) from the WHERE clause first. (eg, INDEX(a,b,...) for WHERE a=12 AND b='xyz' ...) IN column(s); the optimizer may be...

MySQL • Mysql Performance Tips

Function Utilizing setlocal and endlocal

set var1=123456789 set var2=abcdef call :specialvars echo %var1%, %var2% rem More code... :specialvars setlocal set var1=987654321 set var2=fedcba endlocal goto :eof When inside the section setlocal , endlocal section, variables are seperate from the caller's variables, hence why %var...

batch-file • Functions

Pre-Steps needed in order to use Entity Framework 6.1.3 with PostgresSql using Npgsqlddexprovider

1)Took backup of Machine.config from locations C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config and C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config 2)Copy them to different location and edit them as a)locate and add under <system.data> <DbProviderFactories> ...

Entity Framework • Entity-Framework with Postgresql

Adding the DayNight theme to an app

The DayNight theme gives an app the cool capability of switching color schemes based on the time of day and the device's last known location. Add the following to your styles.xml: <style name="AppTheme" parent="Theme.AppCompat.DayNight"> <!-- Customize your th...

Android • DayNight Theme (AppCompat v23.2 / API 14+)

2. Enable service broker on database

ALTER DATABASE [MyDatabase] SET ENABLE_BROKER WITH ROLLBACK IMMEDIATE;

Microsoft SQL Server • Service broker

3. Create basic service broker construction on database (single database communication)

USE [MyDatabase] CREATE MESSAGE TYPE [//initiator] VALIDATION = WELL_FORMED_XML; GO CREATE CONTRACT [//call/contract] ( [//initiator] SENT BY INITIATOR ) GO CREATE QUEUE InitiatorQueue; GO CREATE QUEUE TargetQueue; GO CREATE SERVICE InitiatorService ON QUEUE...

Microsoft SQL Server • Service broker

4. How to send basic communication through service broker

For this demonstration we will use service broker construction created in another part of this documentation. Mentioned part is named 3. Create basic service broker construction on database (single database communication). USE [MyDatabase] DECLARE @ch uniqueidentifier = NEWID() DECLARE @msg XML...

Microsoft SQL Server • Service broker

Checking Package Dependencies with Yarn

yarn why package-name will identify why a package is installed and which other packages depend upon it. yarn why react

yarn • Getting started with yarn

Dependency injection basics

Almost any controller needs some external dependencies to work. Here is a way to configure a dependency object (or its factory) and pass it to a controller. Doing so will help to sustain a separation of concerns, keep code clear and testable. Say, we have an interface and its implementation that...

asp.net-core-mvc • Getting started with asp.net-core-mvc

regr_slope(Y, X) : slope of the least-squares-fit linear equation determined by the (X, Y) pairs

To illustrate how to use regr_slope(Y,X), I applied it to a real world problem. In Java, if you don't clean up memory properly, the garbage can get stuck and fill up the memory. You dump statistics every hour about memory utilization of different classes and load it into a postgres database for anal...

postgresql • Aggregate Functions