Tutorial by Examples: ti

What is interpolated

Perl interpolates variable names: my $name = 'Paul'; print "Hello, $name!\n"; # Hello, Paul! my @char = ('a', 'b', 'c'); print "$char[1]\n"; # b my %map = (a => 125, b => 1080, c => 11); print "$map{a}\n"; # 125 Arrays may be interpolated as a whol...

setting up OL-3

<link rel="stylesheet" href="http://openlayers.org/en/v3.17.1/css/ol.css" type="text/css"> <script src="http://openlayers.org/en/v3.17.1/build/ol.js"></script>

Getting started with a simple map

<html> <head> <title>Getting started</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.17.1/ol.css" type="text/css"> <script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.17.1/ol...

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...

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" ...

Creating a WeakMap object

WeakMap object allows you to store key/value pairs. The difference from Map is that keys must be objects and are weakly referenced. This means that if there aren't any other strong references to the key, the element in WeakMap can be removed by garbage collector. WeakMap constructor has an optional...

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

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...

Effective type

The effective type of a data object is the last type information that was associated with it, if any. // a normal variable, effective type uint32_t, and this type never changes uint32_t a = 0.0; // effective type of *pa is uint32_t, too, simply // because *pa is the object a uint32_t* pa = &a...

Create Memory Optimized Table

-- Create demo database CREATE DATABASE SQL2016_Demo ON PRIMARY ( NAME = N'SQL2016_Demo', FILENAME = N'C:\Dump\SQL2016_Demo.mdf', SIZE = 5120KB, FILEGROWTH = 1024KB ) LOG ON ( NAME = N'SQL2016_Demo_log', FILENAME = N'C:\Dump\SQL2016_Demo_log.ldf', ...

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,...

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....

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...

Index investigations

You could use "SP_HELPINDEX Table_Name", but Kimberly Tripp has a stored procedure (that can be found here), which is better example, as it shows more about the indexes, including columns and filter definition, for example: Usage: USE Adventureworks EXEC sp_SQLskills_SQL2012_helpindex ...

Return actual value specified point in time(FOR SYSTEM_TIME AS OF )

Returns a table with a rows containing the values that were actual (current) at the specified point in time in the past. SELECT * FROM Employee FOR SYSTEM_TIME AS OF '2016-08-06 08:32:37.91'

Sending HTML content in mail

In the above example, if we want to send out HTML content as message in the email, then create a HTML file by going to File -> New -> HTML file Now you can see a HTML file besides your gs file as follows : Now, update the getMessage() method from above example as follows : function getMes...

Basic PL/pgSQL Function

A simple PL/pgSQL function: CREATE FUNCTION active_subscribers() RETURNS bigint AS $$ DECLARE -- variable for the following BEGIN ... END block subscribers integer; BEGIN -- SELECT must always be used with INTO SELECT COUNT(user_id) INTO subscribers FROM users WHERE subscribed...

Iterating over a dictionary

You can iterate over the contents of a dictionary with dict for, which is similar to foreach: set theDict {abcd {ab cd} bcde {ef gh} cdef {ij kl}} dict for {theKey theValue} $theDict { puts "$theKey -> $theValue" } This produces this output: abcd -> ab cd bcde -> ef gh c...

Minimal "Hellow World" transformation

This is a minimal possible XSLT transformation. It produces the string value of the source XML document. The output format is text. Source XML document: <t>Hello, World!</t> XSLT transformation: <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/T...

Installation or Setup

If you don't have Visual Studio 2015, go to https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx and select Visual Studio Community. It is a free version that have all the required capabilities to develop Windows 10 application. You can install the Enterprise Edition if you ha...

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