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NHibernate is a port of the Hibernate object–relational mapping (ORM) tool 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 and open-source software that is distributed under the GNU Lesser General Public License.




Feature summary


NHibernate's primary feature is mapping from .NET classes to database tables (and from CLR data types to SQL data types). NHibernate provides data query and retrieval tools. It generates the SQL commands and removes the need of 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.)




History


Tom Barrett started NHibernate, 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 then lead developer of NHibernate, to work full-time on its future versions. At the end of 2006, JBoss stopped the support to this project. NHibernate is now entirely developed and led by the community. The NHibernate logo, designed by Andrew Mayorov, was chosen sometime before 2008. It features a dormouse, which is known for its long periods of hibernation.
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

=
NHibernate 2.0 was released on August 23, 2008. It is comparable to Hibernate 3.2 in terms of features. With the version 2.0 release, NHibernate dropped support for .NET 1.1.
NHibernate 2.1 was released July 17, 2009.




= NHibernate 3.0

=
NHibernate 3.0 was released on December 4, 2010, and is the first version to use .NET 3.5, with features such as:

Integrated LINQ support
Strongly typed criteria-like API called QueryOver
New AST-based parser for HQL engine
Support for lazy loading columns



NHibernate 3.2

NHibernate 3.2 was released in April, 2011. New features included:

Mapping by code: fluent configuration, .hbm.xml files are no longer required;
Subselect: ability to map SQL views as entities;
HQL paging: TAKE and SKIP on HQL;
Integrated bytecode provider: one less DLL to deploy.




= NHibernate 4.0

=
NHibernate 4.0 was released on August 17, 2014. This version requires .NET Framework 4.0 or later.




= NHibernate 5.0

=
NHibernate 5.0 was released on October 10, 2017. It provides support for asynchronous programming. This version requires .NET Framework 4.6.1 or later.



NHibernate 5.1

NHibernate 5.1 was released on March 17, 2018. It supports .NET Standard 2.0 and .NET Core 2.0.



NHibernate 5.2

NHibernate 5.2 was released on December 4, 2018.



NHibernate 5.3

NHibernate 5.3 was released on July 19, 2020.




Contributions


As open source software, NHibernate has received many contributions from its users. Implementation of LINQ has allowed Language Integrated Query use with NHibernate.




NHibernate Profiler


The NHibernate Profiler is an Object–Relational Mapping tool (ORM) that serves as a real-time visual debugger for NHibernate. It identifies inefficient SQL data queries to eliminate unnecessary work by the database to boost overall performance of the application. The NHibernate Profiler also alerts users to data queries that cost too much in time and directs them to the exact line in the C# code.




Sample


Here a code snippet to add an object to the database and shows how to retrieve, modify and update an object in the database using NHibernate.

NHibernate's configuration may affect when NHibernate executes SQL statements.




See also



List of object–relational mapping software
.NET Persistence API (NPA)




References






Bibliography


Dentler, Jason (October 4, 2010). NHibernate 3.0 Cookbook (1st ed.). Packt Publishing. ISBN 978-1-84951-304-3.
Cure, Aaron (May 5, 2010). NHibernate 2 Beginner's Guide (1st ed.). Packt Publishing. ISBN 978-1-84719-890-7.
Kuaté, Pierre Henri; Harris, Tobin; Bauer, Christian; King, Gavin (February 2009). NHibernate in Action. Manning Publications. ISBN 978-1-932394-92-4.
Perkins, Benjamin (September 2011). Working with NHibernate 3.0 (1st ed.). Wrox. ISBN 978-1-11811-257-1.




External links


NHibernate homepage

Kata Kunci Pencarian:

• NHibernate
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• Hexagonal architecture (software)
• List of .NET libraries and frameworks
• Hibernate (framework)
• ASP.NET
• SourceForge
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• Comparison of object–relational mapping software
• .NET Persistence API

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Daftar Isi

• What is NHibernate and why should I use it? [duplicate]
• How do I view the SQL that is generated by nHibernate?
• How do I Insert or Update (or overwrite) a record using NHibernate?
• Speed up bulk insert operations with NHibernate
• How to create OR statements for NHibernate? - Stack Overflow
• What are NHibernate's advantages over other ORM tools?
• NHibernate - CreateCriteria vs CreateAlias - Stack Overflow
• nhibernate - What is the difference between JoinQueryOver and …
• nhibernate queryover LIKE with expression trees - Stack Overflow
• How can I run NHibenate queries asynchronously?

What is NHibernate and why should I use it? [duplicate]

Oct 12, 2010 · NHibernate saves you from re-inventing the wheel. 90% time you choose file new project its going to be a CRUD(Create, Read, Update, and Delete) project with Database back end. NHibernate does a lot of that work for you hopefully taking away some of the tedium of having to write a new data access layer for every project.

How do I view the SQL that is generated by nHibernate?

Sep 24, 2008 · There is a good reference for NHibernate logging at: How to configure Log4Net for use with NHibernate. It includes info on logging all NHibernate-generated SQL statements. It includes info on logging all NHibernate-generated SQL statements.

How do I Insert or Update (or overwrite) a record using NHibernate?

Typically, NHibernate can rely on the unsaved-value to determine whether it should insert or create the entity. However, since you are assigning the ID, to NHibernate it looks like your entity has already been persisted. Therefore, you need to rely on versioning your object to let NHibernate know that it is a new object.

Speed up bulk insert operations with NHibernate

Mar 30, 2012 · All the above tips are very valid and very useful. Wanted to add one to the collection: disable logging.Having your SQL shown in the console slows you down noticeably, as does profiling using NHProf, auto commenting and pretty-formatting the SQL logged via NLog or …

How to create OR statements for NHibernate? - Stack Overflow

When creating a criteria for NHibernate all criteria are added as AND. For instance: session.CreateCriteria(typeof(someobject)) .Add(critiera) .Add(other_criteria) then end result will be SELEC...

What are NHibernate's advantages over other ORM tools?

Jan 16, 2013 · Advantages and Disadvantages of NHibernate. What differentiates Nhibernate from other ORM’s? And a ton more links to people's opinions on the various .NET ORMs: NHibernate, Entity Framework, active records or linq2sql. In a nutshell, NHibernate is feature rich and battle tested. It's free and open source.

NHibernate - CreateCriteria vs CreateAlias - Stack Overflow

Jun 27, 2012 · To explain the difference between CreateCriteria and CreateAlias in NHibernate 2.0 + lets see the ...

nhibernate - What is the difference between JoinQueryOver and …

Mar 24, 2011 · NHibernate QueryOver .Left.JoinAlias with additional join criteria. 2. TargetInvocationException on ...

nhibernate queryover LIKE with expression trees - Stack Overflow

Jan 17, 2012 · Still, you would have to parse the expression tree and integrate this with NHibernate through a combination of .Where() and .And(). Unless I'm missing something here, it is definitely not worth it. You could use somewhat limited LIKE queries with strongly-typed Linq-to-NH, doing something like session.Query<T>().Where(x => x.property.Contains ...

How can I run NHibenate queries asynchronously?

Unfortunately, no. NHibernate does not expose the internal implementation of the command execution in the way L2S does. You'll have to use the threadpool OR create a patch for NH to add asynchronous query support.