What Is NHibernate?

Hello Friends, In this article, we will learn about NHibernate.

What is NHibernate?

  • NHibernate is an open-source ORM(Object-Relational Mapping) framework.
  • Designed to serve as a persistence layer exclusively for the .Net framework based on ORM Technique.
  • tool that makes a “virtual representation” of database objects inside the code. Used to solve the problem of impedance discrepancy between class and relational databases and tables.

Version History

Versions Year of Release Description
NHibernate 1.0 2006 It was mirrored as the features set of NHibernet 2.1 and NHibernate 3
NHibernate 1.2.1 2007 It introduced many more features from Hibernate 3 and support for .net 2.0, stored procedures, generics, and nullable types.
NHibernate 2.0 2008 It is comparable to Hibernate 3.2 in terms of features. With the version 2.0 release, Nhibernate discarded support for .Net 1.1.
NHibernate 3.0 2010 The 1st version to use .Net 3.5, with features such as:

  • Integrated LINQ support.
  • Strongly typed criteria like API called query over.
  • Support for lazy columns.
NHibernate 3.2 2011 New features included as

  • Mapping by code: fluent configuration, XML files are no longer required.
  • Subselect: the ability to map SQL views as entities
NHibernate 4 2014  This version requires .NET Framework 4.0 or later.
NHibernate 5.0 2017  It provides support for asynchronous programming
NHibernate 5.1 March 2018 It supports .NET Standard 2.0 and .NET Core 2.0
NHibernate 5.2 December 2018 157 issues were resolved in this release.
NHibernate 5.3 2020 Latest release

Databases Support

  • MS SQL Server
  • Windows Azure SQL Database OLE(Object Linking and Embedding)
  • Oracle
  • MySQL
  • Postgres

What is Object-relational mapping?

It could be a method for making a layer to outline information among classes and social databases. This makes, in impact, a “virtual object database” that can be utilized from inside the programming language.

Object-Relational Mapping (ORM) is the arrangement to handle the jumbles as recorded underneath.

  • The problem of Granularity: We can have more classes than database tables.
  • The problem of Inheritance: A database does not support inheritance.
  • The problem of Associations/composition: They cannot be easily represented in a database.
  • The problem of Impedance mismatch: The mismatch between structural and data type representation in classes and databases.

Following Advantages of NHibernate

  • Follow-through the object in the relation database and can do all CRUD operations in it.
  • NHibernate Work with all the database work.
  • Do away with the necessity to write SQL statements or create a stored query.
  • Able to have all of our information get to logic contained within our application.

How To Get It?

This is the sources to download the NHibernate DLL are:
  • NuGet.
  • As a downloadable Zip package from SourceForge.

You can download the zip file from here, also you can install it from the package manager.

Install-Package NHibernate

If you have any questions or issues about this article, please let me know in the comment box.

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