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 3.0 will be the first version to use .Net 3.5.
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.
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