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Understanding the architecture
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The IInterceptor interface was introduced to let the application process callbacks without forcing the persistent classes to implement NHibernate-specific APIs. Implementations of the IInterceptor interface are passed to the persistent instances as parameters. We discuss an example in chapter 8.
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Types A fundamental and powerful element of the architecture is NHibernate s notion of a Type. An NHibernate Type object maps a .NET type to a database column type (the type may span multiple columns). All persistent properties of persistent classes, including associations, have a corresponding NHibernate type. This design makes NHibernate extremely flexible and extensible because each RDBMS has a different set of mapping to .NET types. NHibernate includes a rich range of built-in types, covering all .NET primitives and many CLR classes, including types for System.DateTime, System.Enum, byte[], and Serializable classes. Even better, NHibernate supports user-defined custom types. The interfaces IUserType, ICompositeUserType and IParameterizedType are provided to let you create your own types. You can also use IUserCollectionType to create your own collection types. You can use this feature to handle commonly used application classes such as Address, Name, and MonetaryAmount conveniently and elegantly. Custom types are considered a central feature of NHibernate, and you re encouraged to put them to new and creative uses! We explain NHibernate types and user-defined types in section 6.1. We now go on to list some of the lower-level interfaces. You may not need to use or understand all of them, but knowing they exist may give you extra flexibility when it comes to designing your applications. Extension interfaces Much of the functionality that NHibernate provides is configurable, allowing you to choose between certain built-in strategies. When the built-in strategies are insufficient, NHibernate will usually let you plug in your own custom implementation by implementing an interface. Extension points include the following:
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Primary-key generation (IIdentifierGenerator interface) SQL dialect support (Dialect abstract class) Caching strategies (ICache and ICacheProvider interfaces) ADO.NET connection management (IConnectionProvider interface) Transaction management (ITransactionFactory and ITransaction interfaces) ORM strategies (IClassPersister interface hierarchy) Property-access strategies (IPropertyAccessor interface) Proxy creation (IProxyFactory interface)
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NHibernate ships with at least one implementation of each of the listed interfaces, so you don t usually need to start from scratch if you wish to extend the built-in functionality. The source code is available for you to use as an example for your own implementation.
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Hello NHibernate!
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You should now have an awareness of the various APIs and interfaces that NHibernate provides. Luckily, you won t need them all. For simple applications, you may need only the Configuration and ISession interfaces, as shown in the Hello World example. But before you can begin to use NHibernate in your applications, you must have some understanding of how NHibernate is configured. That is what we discuss next.
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Basic configuration
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NHibernate can be configured to run in almost any .NET application and development environment. Generally, NHibernate is used in two- and three-tiered client/ server applications, with NHibernate deployed only on the server. The client applica-
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tion is usually a web browser, but Windows client applications aren t uncommon. Although we concentrate on multitiered web applications in this book, we cover Windows applications when needed. The first thing you must do is start NHibernate. In practice, doing so is easy: you create an ISessionFactory instance from a Configuration instance.
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Creating a SessionFactory
To create an ISessionFactory instance, you first create a single instance of Configuration during application initialization and use it to set the database access and mapping information. Once configured, the Configuration instance is used to create the SessionFactory. After the SessionFactory is created, you can discard the Configuration class. In the previous examples, we used a MySessionFactory static property to create ISession instances. Here is its implementation:
private static ISessionFactory sessionFactory = null; public static ISessionFactory MySessionFactory { get Done only once { (at first access) if(sessionFactory == null) { Configuration cfg = new Configuration(); When using cfg.Configure(); NHibernate.Mapping.Attributes cfg.AddInputStream( HbmSerializer.Default.Serialize(typeof(Employee)) ); // OR: cfg.AddXmlFile("Employee.hbm.xml"); When using XML sessionFactory = cfg.BuildSessionFactory(); mapping file } return sessionFactory; } }
The location of the mapping file, Employee.hbm.xml, is relative to the application s current directory. In this example, you also use an XML file to set all other configuration options (which may have been set earlier by application code or in the application configuration file).
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