Tutorial by Topics

JDBC, or Java DataBase Connectivity, is the Java specification for connecting to (relational) databases. JDBC provides a common API in the form of a number of interfaces and exceptions, and expectations (or requirements) of drivers. The JDBC specification consists of two parts: A specification...

Given an R object, we may require separate analysis for one or more parts of the data contained in it. The process of obtaining these parts of the data from a given object is called subsetting. Missing values: Missing values (NAs) used in subsetting with [ return NA since a NA index picks ...

An operator is something that takes one or more values (or expressions, in programming jargon) and yields another value (so that the construction itself becomes an expression). Operators can be grouped according to the number of values they take. Operators 'operate' or act on one (unary opera...

define ( string $name , mixed $value [, bool $case_insensitive = false ] ) const CONSTANT_NAME = VALUE; Constants are used to store the values that are not supposed to be changed later. They also are often used to store the configuration parameters especially those which define the environ...

This topic provides examples for unit testing the various constructs in AngularJS. Unit tests are often written using using Jasmine, a popular behavior driven testing framework. When unit testing angular constructs, you will need to include ngMock as a dependency when running the unit tests.

from django.contrib.postgres.fields import ArrayField class ArrayField(base_field, size=None, **options) FooModel.objects.filter(array_field_name__contains=[objects, to, check]) FooModel.objects.filter(array_field_name__contained_by=[objects, to, check]) Note that although the size param...

There are some cases where your application cannot manipulate the contents of assets loaded from an external resource (e.g. transform images). I can't remember for certain what they are, but I am fairly sure it's related to cross domain content loading.

SQLALCHEMY'S PHILOSOPHY From the SQLAlchemy Website: SQL databases behave less like object collections the more size and performance start to matter; object collections behave less like tables and rows the more abstraction starts to matter. SQLAlchemy aims to accommodate both of these principl...

This section provides an overview of what ssl is, and why a developer might want to use it. It should also mention any large subjects within ssl, and link out to the related topics. Since the Documentation for ssl is new, you may need to create initial versions of those related topics.

This section provides an overview of what salt-stack is, and why a developer might want to use it. It should also mention any large subjects within salt-stack, and link out to the related topics. Since the Documentation for salt-stack is new, you may need to create initial versions of those rela...

Stored Procedures are SQL statements stored in the database that can be executed or called in queries. Using a stored procedure allows encapsulation of complicated or frequently used logic, and improves query performance by utilizing cached query plans. They can return any value a standard query c...

<label>Example <input type="radio" name="r"></label> // Wrapping a control Element <label for="rad1">Example</label> <input id="rad1" type="radio" name="r"> // Using for attribute AttributesDes...

:split <file> :vsplit <file> :sp <- shorthand for split :vsp <- shorthand for vsplit When called from the command line, multiple files can be provided in the argument and vim will create one split for each file. When called from ex mode, only one file can be opened per ...

To increment and decrement things like 11:59AM, 3rd, and XVIII, use the plugin vim-speeddating

Pug (formerly known as jade) is a high performance template engine heavily influenced by Haml and implemented with JavaScript for Node.js and browsers. Produces HTML Supports dynamic code Supports reusability (DRY) Home page Repository on GitHub versionrelease date0.0.22010-07-031.0.0...