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connection.driver_class specifies the name of the .NET class implementing the ADO.NET Driver. Note when using the partial name of a driver that is in the global assembly cache (GAC), you have to add a <qualifyAssembly> element in the application configuration file to specify its fully qualified name so that NHibernate can successfully load it. connection.connection_string specifies a standard ADO.NET connection string, used to create a database connection.
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Note that these names (except the ConnectionString) should be fully qualified type names; they aren t here because they re implemented in the NHibernate.dll library, which is where the .NET framework looks for non fully qualified types when NHibernate tries to load them.
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STARTING NHIBERNATE
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How do you start NHibernate with these properties You declared the properties in a file named hibernate.cfg.xml, so you need only place this file in the application s directory. It s automatically detected and read when you create a Configuration object and call its Configure() method. Let s summarize the configuration steps you ve learned so far (this is a good time to download and install NHibernate):
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If your database s ADO.NET data provider isn t yet installed, download and install it; it s usually available from the database vendor website. If you re using SQL Server, then you can skip this step. Add log4net.dll as reference to your project. This is optional but recommended. Decide which database-access properties NHibernate will need. Let the Configuration know about these properties by placing them in a hibernate.cfg.xml file in the current directory. Create an instance of Configuration in your application, call the Configure() method; load the mapped classes (with .NET attributes) using HbmSerializer. Default.Serialize() and AddInputStream(); and load the XML mapping files using either AddAssembly(), AddClass(), or AddXmlFile(). Build an ISessionFactory instance from the Configuration by calling BuildSessionFactory(). Remember to close the instance of ISessionFactory (using MySessionFactory.Close()) when you re done using NHibernate. Most of the time, you ll do it while closing your application.
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There are a few more steps when you use COM+ Enterprise Services; you ll learn more about them in chapter 6. Don t worry; NHibernate code can be easily integrated into COM+ with only a few additions. You should now have a running NHibernate system. Create and compile a persistent class (the initial Employee, for example), add references to NHibernate.dll, log4net, and NHibernate.Mapping.Attributes in your project, put a hibernate.cfg.xml file in the application current directory, and build an ISessionFactory instance.
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Hello NHibernate!
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The next section covers advanced NHibernate configuration options. Some of them are recommended, such as logging executed SQL statements for debugging, and using the convenient XML configuration file instead of plain properties. But if you wish, you may safely skip this section and come back later once you ve read more about persistent classes in chapter 3.
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Advanced configuration settings
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When you finally have an NHibernate application running, it s well worth getting to know all the NHibernate configuration parameters. These parameters let you optimize the runtime behavior of NHibernate, especially by tuning the ADO.NET interaction (for example, using ADO.NET batch updates). We don t bore you with these details now; the best source of information about configuration options is the NHibernate reference documentation. In the previous section, we showed you the options you need to get started. But there is one parameter we must emphasize at this point. You ll need it continually when you develop software with NHibernate. Setting the property show_sql to the value true enables logging of all generated SQL to the console. You ll use it for troubleshooting, performance tuning, and just to see what s going on. It pays to be aware of what your ORM layer is doing that s why ORM doesn t hide SQL from developers. So far, we ve assumed that you specify configuration parameters using a hibernate.cfg.xml file or programmatically using the collection Configuration.Properties. You may also specify these parameters using the application configuration file (web.config, app.config, and so on).
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