NHibernate
From Wikipedia, the free encyclopedia
NHibernate is an Object-relational mapping (ORM) solution for the Microsoft .NET platform: it provides an easy to use framework for mapping an object-oriented domain model to a traditional relational database. Its purpose is to relieve the developer from a significant amount of relational data persistence-related programming tasks.
NHibernate is free as open source software that is distributed under the GNU Lesser General Public License.
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[edit] Versions
NHibernate is a port of the popular Java O/R mapper Hibernate to .NET. Version 1.0 mirrored the feature set of Hibernate 2.1, as well as a number of features from Hibernate 3.
NHibernate 1.2.1, released in November 2007, introduced many more features from Hibernate 3 and support for .NET 2.0, stored procedures, generics, and nullable types.
NHibernate 2.0 is currently under development and will provide most of the Hibernate 3 features.
[edit] Feature summary
NHibernate's primary feature is mapping from .NET classes to database tables (and from CLR data types to SQL data types). NHibernate also provides data query and retrieval facilities. NHibernate generates the SQL commands and relieves the developer from manual data set handling and object conversion, keeping the application portable to most SQL databases, with database portability delivered at very little performance overhead.
NHibernate provides transparent persistence for Plain Old CLR Objects (POCOs). The only strict requirement for a persistent class is a no-argument constructor, which does not have to be public. (Proper behavior in some applications also requires special attention to the Equals() and GetHashCode() methods. [1])
[edit] History
NHibernate was started by Tom Barrett, and later picked up by Mike Doerfler and Peter Smulovics. At the end of 2005, JBoss, Inc. (now part of Red Hat) hired Sergey Koshcheyev, the current lead developer of NHibernate, to work full-time on its future versions. [2]
Pierre Henri Kuaté is currently writing NHibernate in Action, a book planned to provide comprehensive documentation for NHibernate.
[edit] Contributions
As open source software, NHibernate has received many contributions from its users. Most of them are directly integrated as internal features. Others are provided by the users as utilities and documentation.
Implementation of LINQ has allowed Language Integrated Query use with NHibernate. See Ayende's blog for more details. [3]
[edit] References
- ^ hibernate.org - Equals and HashCode
- ^ [Hibernate] NHibernate joins Hibernate at JBoss Inc
- ^ Implementing Linq for NHibernate: A How To Guide - Part 1
[edit] External links
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