.NET Persistence API: Difference between revisions

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The '''.NET Persistence API''', also referred to as '''NPA''', is a persistence and [[object-relationalobject–relational mapping]] (ORM) specification for the [[.NET Framework|.NET framework]].<ref>[http://www.npersistence.org/ NPersistence | JPA for the .NET platform<!-- Bot generated title -->]</ref>

NPA is based on the [[Java Persistence API]] (JPA), which is the standard persistence API in the [[Java (programming language)|Java]] world. NPA follows JPA by providing a complete persistence API and a rich set of ORM features.<ref name=autogenerated1>{{Cite web |url=http://www.npersistence.org/faq |title=FAQ |{{!}} NPersistence<!-- Bot generated title --> |access-date=20112018-1208-3024 |archive-url=https://web.archive.org/web/20120426082101/http://www.npersistence.org/faq |archive-date=2012-04-26 |deadurl-url=yes |dfstatus=dead }}</ref><ref>[https://stackoverflow.com/questions/2756307/what-is-the-equivalent-of-jpa-in-net c# -– What is the equivalent of JPA in .NET? -– Stack Overflow<!-- Bot generated title -->]</ref>

== Motivation ==

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== Technology ==

The main features of NPA include:<ref>{{Cite web |url=http://www.npersistence.org/api-reference |title=API Reference | NPersistence<!-- Bot generated title --> |access-date=20112018-1208-3024 |archive-url=https://web.archive.org/web/20120426082146/http://www.npersistence.org/api-reference |archive-date=2012-04-26 |deadurl-url=yes |dfstatus=dead }}</ref><ref>[http://nugetmusthaves.com/Package/NPersistence NPersistence -– NuGet Must Haves<!-- Bot generated title -->]</ref>

* Object-oriented API for working against databases (usually RDBMS).

* Query language, based on SQL, for retrieving data from the database in an object oriented manner.

* Support of persisting [[Plain Old CLR Object|POCO (plain old CLR objects)]] objects (entities).

* Two methods for marking classes as entity classes and for specifying other settings:

** Using attributes -– meta data is embedded in class definitions in the source code.

** Using external XML -– meta data is specified in external [[XML]] resource files.

== Implementations ==

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Persistence and ORM vendors can provide their own implementations of NPA.

First implementation, NPA for [[NHibernate]], was released in December 2011.<ref>{{Cite web |url=http://www.npersistence.org/nhibernate |title=NPA for NHibernate | NPersistence<!-- Bot generated title --> |access-date=2011-12-30 |archive-url=https://web.archive.org/web/20120426082225/http://www.npersistence.org/nhibernate |archive-date=2012-04-26 |deadurl-url=yes |dfstatus=dead }}</ref><ref>[https://archive.today/20130928184005/http://forums.anandtech.com/archive/index.php/t-2108535.html What is the equivalent of Java Persistence API for .NET? -– AnandTech Forums<!-- Bot generated title -->]</ref>

== References ==

{{reflistReflist}}

== External links ==

{{Wikibooks|.NET Development Foundation}}

*{{Official website|www.npersistence.org}}

{{.NET Framework}}

{{DEFAULTSORT:NET Persistence API}}

[[Category:.NET|Persistence FrameworkAPI]]

[[Category:Object-relationalObject–relational mapping]]

[[Category:Cross-platform software]]