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Achieving Persistence Ignorance with NHibernate

Achieving Persistence Ignorance with NHibernate. James Kovacs JamesKovacs.com jkovacs@post.harvard.edu. What is Persistence Ignorance?. POCO – Plain Old CLR Object No persistence-related code Only business logic public class Customer {      public string Name { get; }

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Achieving Persistence Ignorance with NHibernate

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  1. Achieving Persistence Ignorancewith NHibernate James Kovacs JamesKovacs.com jkovacs@post.harvard.edu

  2. What is Persistence Ignorance? • POCO – Plain Old CLR Object • No persistence-related code • Only business logic public class Customer {      public string Name { get; }     public Location Address { get; }     public IList<Order> Orders { get; }     public void AddOrder(Order o) {} }

  3. Why is Persistence Ignorance Important? • Separation of concerns • Single responsibility • Loose coupling • Testability • Re-use

  4. NHibernate and PI • No special persistence-related base class • No marker or callback interfaces • No persistence-related attributes • NHibernate domain class: public class Customer {      public string Name { get; }     public Location Address { get; }     public IList<Order> Orders { get; }     public void AddOrder(Order o) {} }

  5. NHibernate API

  6. Key Features for PI • Persistence by reachability • Automatic dirty checking • Transparent lazy loading

  7. Resources • NHibernate (http://www.nhibernate.org) • NHForge (http://www.nhforge.org) • NHibernate Resources (http://www.hibernate.org/365.html) • NHUsers Google Group (http://groups.google.com/group/nhusers) • ActiveWriter (http://using.castleproject.org/display/Contrib/ActiveWriter) • The Bookshelf (http://www.jameskovacs.com/blog/TheBookshelf.aspx)

  8. Questions James Kovacs JamesKovacs.com jkovacs@post.harvard.edu

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