Language Integrated Query: Difference between revisions

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'''Language Integrated Query''' ('''LINQ''', pronounced "link") is a [[Microsoft]] [[.NET Framework]] component that adds native data [[Query language|querying]] capabilities to [[List of CLI languages|.NET languages]], originally released as a major part of [[.NET Framework 3.5]] in 2007.

LINQ extends the language by the addition of query [[Expression (computer science)|expressions]], which are akin to [[SQL]] statements, and can be used to conveniently extract and process data from [[Array data structure|arrays]], enumerable [[class (computer science)|class]]es, [[XML]] documents, [[relational database]]s, and third-party data sources. Other uses, which utilize query expressions as a general framework for readably composing arbitrary computations, include the construction of event handlers<ref name="reactive">{{cite web | url = http://msdn.microsoft.com/en-us/devlabs/ee794896.aspx | title = Rx framework}}</ref> or [[Monad (functional programming)|monadic]] [[Parsing|parsers]].<ref name="parscomb">{{cite web | url = http://blogs.msdn.com/lukeh/archive/2007/08/19/monadic-parser-combinators-using-c-3-0.aspx | title = Monadic Parser Combinators using C#3 | accessdate = 2009-11-21}}</ref> It also defines a set of method names (called ''standard query operators'', or ''standard sequence operators''), along with translation rules used by the compiler to translate query syntax expressions similar to SQL into expressions using [[Fluent interface|fluent-style]] (called method syntax by Microsoft) with these method names, [[Anonymous function#C.23 lambda expressions|lambda expressions]] and [[anonymous type]]s. Many of the concepts that LINQ introduced were originally tested in Microsoft's [[Cω]] research project.

Ports of LINQ exist for [[PHP]] ([https://phplinq.codeplex.com/ PHPLinq]), [[JavaScript]] ([https://github.com/mihaifm/linq linq.js]), [[TypeScript]] ([https://github.com/kutyel/linq.ts linq.ts]), and [[ActionScript]] ([http://actionlinq.riaforge.org/ ActionLinq]), although none are strictly equivalent to LINQ in the .NET inspired languages C#, F# and VB.NET (where it is a part of the language, not an external library, and where it often addresses a wider range of needs).{{citation needed|date=October 2018}}