Tutorial by Examples: an

Construct and execute

(This is a request for a good example that shows how to construct a SELECT using CONCAT, then prepare+execute it. Please emphasize the use of @variables versus DECLAREd variables -- it makes a big difference, and it is something that novices (include myself) stumble over.)

MySQL • PREPARE Statements

Declaring Bean

To declare a bean, simply annotate a method with the @Bean annotation or annotate a class with the @Component annotation (annotations @Service, @Repository, @Controller could be used as well). When JavaConfig encounters such a method, it will execute that method and register the return value as a b...

spring • Creating and using beans

Random number generator's reproducibility

When expecting someone to reproduce an R code that has random elements in it, the set.seed() function becomes very handy. For example, these two lines will always produce different output (because that is the whole point of random number generators): > sample(1:10,5) [1] 6 9 2 7 10 >...

R Language • Random Numbers Generator

Time Zones and Daylight Savings Time

The DATE data type does not handle time zones or changes in daylight savings time. Either: use the TIMESTAMP WITH TIME ZONE data type; or handle the changes in your application logic. A DATE can be stored as Coordinated Universal Time (UTC) and converted to the current session time zone like...

Oracle Database • Dates

Command line arguments

Command line arguments parsing is Go is very similar to other languages. In you code you just access slice of arguments where first argument will be the name of program itself. Quick example: package main import ( "fmt" "os" ) func main() { progName := o...

Go • Parsing Command Line Arguments And Flags

Declaration and attributes

Throughout the topics and examples here we'll see many declarations of variables, functions and so on. As well as their name, data objects may have attributes. Covered in this topic are declaration statements like integer, parameter :: single_kind = kind(1.) which gives the object single_kind...

Fortran • Data Types

Difference between jQuery(fn) and executing your code before

Using the document-ready event can have small performance drawbacks, with delayed execution of up to ~300ms. Sometimes the same behavior can be achieved by execution of code just before the closing </body> tag: <body> <span id="greeting"></span> world! <sc...

jQuery • document-ready event

Changing cached resources

The easiest method to bypass cache is to change the URL. This is used as a best practice when the URL contains a version or a checksum of the resource, e.g. http://example.com/image.png?version=1 http://example.com/image.png?version=2 These two URLs will be cached separately, so even if …?versi...

HTTP • Caching HTTP responses

TransitionDrawable animation

This example displays a transaction for an image view with only two images.(can use more images as well one after the other for the first and second layer positions after each transaction as a loop) add a image array to res/values/arrays.xml <resources> <array name=&...

Android • Animators

One line showing commiter name and time since commit

tree = log --oneline --decorate --source --pretty=format:'"%Cblue %h %Cgreen %ar %Cblue %an %C(yellow) %d %Creset %s"' --all --graph example * 40554ac 3 months ago Alexander Zolotov Merge pull request #95 from gmandnepr/external_plugins |\ | * e509f61 3 months ago Ievg...

Git • Browsing the history

Changing a Remote Repository

To change the URL of the repository you want your remote to point to, you can use the set-url option, like so: git remote set-url <remote_name> <remote_repository_url> Example: git remote set-url heroku https://git.heroku.com/fictional-remote-repository.git

Git • Working with Remotes

Connect and Express

Express is based on Connect, which is what provides the middleware functionality of Express. To understand what connect is, you can see that it provides the basic app structure that you use when you use express const connect = require('connect') const app = connect() app.listen(3000) This wi...

express • Connect

Errors and error middleware

If we would like to limit the access to our app, we could write a middleware for that too! This example only grants you access on thrusdays, but a real world example could, for example, be user authentication. A good place to put this would be after the logging middleware but before any content is s...

express • Connect

Calling an instance method on a Java object

You can call an instance method using the . special form: (.trim " hello ") ;;=> "hello" You can call instance methods with arguments like this: (.substring "hello" 0 2) ;;=> "he"

clojure • Java interop

Referencing an instance field on a Java Object

You can call an instance field using the .- syntax: (def p (java.awt.Point. 0 1)) (.-x p) ;;=> 0 (.-y p) ;;=> 1

clojure • Java interop

Creating a new Java object

You can create instance of objects in one of two ways: (java.awt.Point. 0 1) ;;=> => #object[java.awt.Point 0x3776d535 "java.awt.Point[x=0,y=1]"] Or (new java.awt.Point 0 1) ;;=> => #object[java.awt.Point 0x3776d535 "java.awt.Point[x=0,y=1]"]

clojure • Java interop

Install Atom (and some useful packages)

Goto https://atom.io/ and install the atom editor. Then install some Atom packages for easier Titanium coding: NameTypeFeaturestitanium language javascriptLanguageJS Autocomplete (non alloy)Titanium Alloyadd-onAll-in-one packageJump to definitionOpen relatedTSS HighlightTi-Createadd-onCreate proje...

appcelerator • Getting started with appcelerator

Get all combinations / permutations of an array

The permutation method, when called with a block yields a two dimensional array consisting of all ordered sequences of a collection of numbers. If this method is called without a block, it will return an enumerator. To convert to an array, call the to_a method. ExampleResult[1,2,3].permutation#&lt...

Ruby Language • Arrays

Database transactions for mutliple database connection

DatabaseTransactions trait allows databases to rollback all the change during the tests. If you want to rollback multiple databases , you need to set $connectionsToTransact properties use Illuminate\Foundation\Testing\DatabaseMigrations; class ExampleTest extends TestCase { use Databas...

Laravel • Testing

Send messages from JavaScript and Handle them on the native side

Messages can be sent from JavaScript using the following code window.webkit.messageHandlers.{NAME}.postMessage() Here how to create a script message handler to handle the messages: class NotificationScriptMessageHandler: NSObject, WKScriptMessageHandler { func userContentController(userCon...

iOS • WKWebView