NHibernate is an Object-relational mapping (ORM) solution for the Microsoft .NET platform: it provides a framework for mapping an object-oriented domain model to a traditional relational database. Its purpose is to relieve the developer from a significant portion of relational data persistence-related programming tasks.
NHibernate is free as open source software that is distributed under the GNU Lesser General Public License.
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 was released August 23, 2008. It is comparable to Hibernate 3.2 in terms of features.
NHibernate 2.1 is currently under development and should be released in mid 2009.
NHibernate 3.0 will be the first version to use .Net 3.5.
A partial implementation of a LINQ provider is available for 2.1. A new AST parser which can transform HQL (Hibernate Query Language) or LINQ is in development for a future version of NHibernate.
courtesy: Wikipedia
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