Tutorial by Examples: s

Getting started with a simple map

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openlayers-3 • Getting started with openlayers-3

Using a table valued parameter to insert multiple rows to a table

First, define a used defined table type to use: CREATE TYPE names as TABLE ( FirstName varchar(10), LastName varchar(10) ) GO Create the stored procedure: CREATE PROCEDURE prInsertNames ( @Names dbo.Names READONLY -- Note: You must specify the READONLY ) AS INSERT INTO d...

Microsoft SQL Server • Table Valued Parameters

Defining a basic module

Java Language • Modules

Expressing the power of 2

For expressing the power of 2 (2^n) of integers, one may use a bitshift operation that allows to explicitly specify the n. The syntax is basically: int pow2 = 1<<n; Examples: int twoExp4 = 1<<4; //2^4 int twoExp5 = 1<<5; //2^5 int twoExp6 = 1<<6; //2^6 ... int twoEx...

Java Language • Bit Manipulation

Get-Alias

To list all aliases and their functions: Get-Alias To get all aliases for specific cmdlet: PS C:\> get-alias -Definition Get-ChildItem CommandType Name Version Source ----------- ---- -...

PowerShell • Aliases

Set-Alias

This cmdlet allows you to create new alternate names for exiting cmdlets PS C:\> Set-Alias -Name proc -Value Get-Process PS C:\> proc Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id SI ProcessName ------- ------ ----- ----- ----- ------ -- -- ----------- 2...

PowerShell • Aliases

Installing PostgreSQL on Windows

While it's good practice to use a Unix based operating system (ex. Linux or BSD) as a production server you can easily install PostgreSQL on Windows (hopefully only as a development server). Download the Windows installation binaries from EnterpriseDB: http://www.enterprisedb.com/products-services-...

postgresql • Getting started with postgresql

A Basic Importer

Assume you have a custom file you want to create an importer for. It could be an .xls file or whatever. In this case we're going to use a JSON file because it's easy but we're going to pick a custom extension to make it easy to tell which files are ours? Let's assume the format of the JSON file is ...

unity3d • Importers and (Post)Processors

Using the right-left or spiral rule to decipher C declaration

The "right-left" rule is a completely regular rule for deciphering C declarations. It can also be useful in creating them. Read the symbols as you encounter them in the declaration... * as "pointer to" - always on the left side [] as "array of" ...

C Language • Declarations

Goto statements

A goto statement transfers control to the statement with the corresponding label within the same function. Executing the goto statement must not cause any variables to come into scope that were not already in scope at the point of the goto. for example see the standard library source code: https:/...

Go • Branching

Getting a value associated to the key

To get a value associated to the key, use the .get() method. If there's no value associated to the key, it returns undefined. const obj1 = {}, obj2 = {}; const weakmap = new WeakMap([[obj1, 7]]); console.log(weakmap.get(obj1)); // 7 console.log(weakmap.get(obj2)); // undefined

JavaScript • WeakMap

Assigning a value to the key

To assign a value to the key, use the .set() method. It returns the WeakMap object, so you can chain .set() calls. const obj1 = {}, obj2 = {}; const weakmap = new WeakMap(); weakmap.set(obj1, 1).set(obj2, 2); console.log(weakmap.get(obj1)); // 1 console.log(weakmap.get(obj2)); // 2 ...

JavaScript • WeakMap

Checking if an element with the key exists

To check if an element with a specified key exits in a WeakMap, use the .has() method. It returns true if it exits, and otherwise false. const obj1 = {}, obj2 = {}; const weakmap = new WeakMap([[obj1, 7]]); console.log(weakmap.has(obj1)); // true console.log(weakmap.has(obj2)); // false...

JavaScript • WeakMap

Compile docker with checkpoint and restore enabled (ubuntu)

In order to compile docker its recommended you have at least 2 GB RAM. Even with that it fails sometimes so its better to go for 4GB instead. make sure git and make is installed sudo apt-get install make git-core -y install a new kernel (at least 4.2) sudo apt-get install linux-generic...

Docker • Checkpoint and Restore Containers

Checkpoint and Restore a Container

# create docker container export cid=$(docker run -d --security-opt seccomp:unconfined busybox /bin/sh -c 'i=0; while true; do echo $i; i=$(expr $i + 1); sleep 1; done') # container is started and prints a number every second # display the output with docker logs $cid # checkpoint the cont...

Docker • Checkpoint and Restore Containers

Installation

In order to get started, you just need to install the Unity nuget package. Run the following command from the package manager console: PM> Install-Package Unity Alternatively, you can use Visual Studio to install Unity on a particular project using the Manage NuGet Packages for Solution opti...

unity-container • Getting started with unity-container

Using standard SQL directly with models

To use SQL syntax with model, that would transfer result to proper instantions, you should use directly one of Phalcon\Mvc\Model\Resultset classes: $users = new \Application\Models\Users(); // bitwise operation on `flag` field $sql = 'SELECT * FROM phorum.users WHERE (15 & (1 <&...

phalcon • Database Management

Show created .dll files and tables for Memory Optimized Tables

SELECT OBJECT_ID('MemOptTable1') AS MemOptTable1_ObjectID, OBJECT_ID('MemOptTable2') AS MemOptTable2_ObjectID GO SELECT name,description FROM sys.dm_os_loaded_modules WHERE name LIKE '%XTP%' GO Show all Memory Optimized Tables: SELECT name,type_desc,durability_desc,...

Microsoft SQL Server • In-Memory OLTP (Hekaton)

Memory-Optimized Table Types and Temp tables

For example, this is traditional tempdb-based table type: CREATE TYPE dbo.testTableType AS TABLE ( col1 INT NOT NULL, col2 CHAR(10) ); To memory-optimize this table type simply add the option memory_optimized=on, and add an index if there is none on the original type: CREATE TYPE dbo....

Microsoft SQL Server • In-Memory OLTP (Hekaton)

Declare Memory-Optimized Table Variables

For faster performance you can memory-optimize your table variable. Here is the T-SQL for a traditional table variable: DECLARE @tvp TABLE ( col1 INT NOT NULL , Col2 CHAR(10) ); To define memory-optimized variables, you must first create a memory-optimized table type and...

Microsoft SQL Server • In-Memory OLTP (Hekaton)