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NHibernate for .NET
This document provides an introduction and overview of NHibernate, an object-relational mapper for .NET. It discusses what ORM is, the benefits of ORM, and gives a high-level overview of NHibernate. It then walks through a sample application demonstrating how to map objects and database tables, work with sessions and transactions, and perform common data access operations like create, read, update and delete. Reference materials on NHibernate are also provided.
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NHibernate for .NET
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- 2. Introduction to ORMIntroductionto NHibernateScenarioNHibernate DemoDemo ProcessHibernate-config.xmlMapping files & classesSessionManagerDAO (Data Access Object)Create ASPX to do testingReference2Agenda
- 3.
- 4. Object-relational mapping (akaORM, O/RM, and O/R mapping) is a programming technique for converting data between incompatible type systems in relational databases and object-oriented programming languages (Wikipedia)Objects are hierarchicalDatabases are relationalWhat is ORM?ORMobjectsrelational4
- 5. ProductivityEliminates lots ofrepetitive code – focus on business logicDatabase schema is generated automaticallyMaintainabilityFewer lines of code – easier to understandEasier to manage change in the object modelPerformanceLazy loading – associations are fetched when neededCachingDatabase vendor independenceThe underlying database is abstracted awayCan be configured outside the applicationORM Benefits5
- 6. 6ORM and ArchitactureOracle,MS SQL Server, DB2, MySQL, Sybase, etc.
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- 8. Initially developed forJavacreated in late 2001 by Gavin Kingabsorbed by the JBossGroup / Red HatPorted to .NET 1.1, 2.0, 3.5Resulting product called “NHibernate”All popular databases supportedOracle, SQL Server, DB2, SQLite, PostgreSQL, MySQL, Sybase, Firebird, …XML-based configuration filesGood community supportFree/open source -NHibernateis licensed under the LGPL (Lesser GNU Public License)Introduction to NHibernate8
- 9. 9High-level overview ofthe Nhibernate API
- 10. NHibernate managing databaseaccess10
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- 12. ISessionFactoryOne per database(or application)Expensive to createReads configurationISessionPortal to the databaseSaves, retrievesITransactionEncapsulates database transactionsNhibernate in a Nutshell12
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- 14. One people mayhave more than one contactOne contact belongs to one people14Database schema
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- 16. 16Sequence diagram –create
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- 18. 18Sequence diagram –Update
- 19. 19Sequence diagram –Delete
- 20. 20Project DirectoriesStored persistencetier-related codeStored presentation tier-related codeData access objectsValue objects and mapping files
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- 22. LibrariesRequired libraryRequired forlazy loadingAntlr3.Runtime.dllIesi.Collections.dlllog4net.dllNHibernate.dllCastle.Core.dllCastle.DynamicProxy2.dllNHibernate.ByteCode.Castle.dll22
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- 27.
- 28. <class> declare apersistent class<id> defines the mapping from that property to the primary key columnSpecifies strategy<property> declares a persistent property of the class<component> maps properties of a child object to columns of the table of a parent class.AssociationsOne-to-ManyMany-to-OneMany-to-ManyOne-to-One (uncommon)28Mapping Concepts
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- 30. 30Mapping files &classesORMobjectsrelational
- 31. 31Mapping files &classes – cont.
- 32. 32Mapping files &classes – cont.
- 33. 33Mapping files &classes – cont.
- 34. 34Session Manager[ISession]Obtained froma SessionFactory instance
- 35. Responsible for storingand retrieving objects
- 36. Think of itas a collection of loaded objects related to a single unit of work35DAO (Data Access Object)
- 37. 36DAO (Data AccessObject) – cont.
- 38. 37DAO (Data AccessObject) – cont.
- 39. 38DAO (Data AccessObject) – cont.
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- 41. Transaction: A setof database operations which must be executed in entirety or not at allShould end either with a commit or a rollbackAll communication with a database has to occur inside a transaction!40Transactions
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- 43. Create a newrecord
- 44. 43Read data bycriteria
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- 47. O/R Mappinghttp://en.wikipedia.org/wiki/Object-relational_mappingOfficial sitewww.hibernate.orgNHibernatein ActionNHibernate Made Simplehttp://www.codeproject.com/KB/database/Nhibernate_Made_Simple.aspxNHibernate Best Practices http://www.codeproject.com/KB/architecture/NHibernateBestPractices.aspx46Reference