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You can use the application configuration file to fully configure an ISessionFactory instance (as demonstrated in listings 2.7 and 2.8). The application configuration file can contain either configuration parameters using an <nhibernate> section, or the same content as hibernate.cfg.xml file (using a <hibernate-configuration> section). Many users prefer to centralize the configuration of NHibernate this way instead of adding parameters to the Configuration in application code.
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Listing 2.7 App.config configuration file using <nhibernate>
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< xml version="1.0" > <configuration> <configSections> <section name="nhibernate" type="System.Configuration.NameValueSectionHandler, NHibernate section System, Version=1.0.5000.0, Culture=neutral, declaration PublicKeyToken=b77a5c561934e089" /> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> </configSections>
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<nhibernate>
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Advanced configuration settings
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<add key="hibernate.connection.provider" value="NHibernate.Connection.DriverConnectionProvider" /> Property <add specifications key="hibernate.dialect" value="NHibernate.Dialect.MsSql2000Dialect" /> <add key="hibernate.connection.driver_class" value="NHibernate.Driver.SqlClientDriver" /> <add key="hibernate.connection.connection_string" value="initial catalog=nhibernate;Integrated Security=SSPI" /> </nhibernate>
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<!-- log4net configuration settings here... --> </configuration>
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Log4net settings could go here
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The NHibernate section is declared B as a series of key/value entries. The key is the name of the property to set C. You ll learn about log4net D in the next section. It s recommended that you use a <hibernate-configuration> section, as shown in listing 2.8.
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Listing 2.8 App.config configuration file using <hibernate-configuration>
< xml version="1.0" > <configuration> Hibernate configuration <configSections> section declaration <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler,NHibernate" /> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> </configSections> <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"> <session-factory> <property name="connection.provider"> NHibernate.Connection.DriverConnectionProvider </property> <property name="dialect"> Property NHibernate.Dialect.MsSql2000Dialect specifications </property> <property name="connection.driver_class"> NHibernate.Driver.SqlClientDriver </property> <property name="connection.connection_string"> Initial Catalog=nhibernate;Integrated Security=SSPI </property> </session-factory> </hibernate-configuration>
<!-- log4net configuration settings here... --> </configuration>
Hello NHibernate!
Now, B declares a <hibernate-configuration>, as in hibernate.cfg.xml, which is based on the schema nhibernate-configuration.xsd. The value is inside the <property> tag C. This way is far more elegant and powerful, because you can also specify assemblies/ mapping documents. And you can configure an IDE like Visual Studio to provide IntelliSense inside the <hibernate-configuration> section: copy the configuration schema file (nhibernate-configuration.xsd) in the subdirectory \Common7\Packages\schemas\ xml\ of the Visual Studio installation directory. You can also configure the mapping schema file (nhibernate-mapping.xsd) to have IntelliSense when editing mapping files. You can find these files in NHibernate s source code. Note that you can use a <connectionStrings> configuration-file element to define a connection string and then give its name to NHibernate using the hibernate. connection.connection_string_name property. Now you can initialize NHibernate as follows:
ISessionFactory sessionFactory = new Configuration() .Configure() .BuildSessionFactory();
Wait how does NHibernate know where the configuration file is located When Configure() is called, NHibernate first searches for the information in the application configuration file and then in a file named hibernate.cfg.xml in the current directory. If you wish to use a different filename or have NHibernate look in a subdirectory, you must pass a path to the Configure() method:
ISessionFactory sessionFactory = new Configuration() .Configure("NHibernate.config") .BuildSessionFactory();
Using an XML configuration file is more comfortable than using a programmatic configuration. The fact that you can have the class-mapping files externalized from the application s source (even if it s only in a startup helper class) is a major benefit of this approach. You can, for example, use different sets of mapping files (and different configuration options) depending on your database and environment (development or production), and switch them programmatically. If you have both an application configuration file and hibernate.cfg.xml in the current directory, the application configuration file s settings are used.
NOTE
You can give the ISessionFactory a name. This name is specified as an attribute like this: <session-factory name="MySessionFactory">. NHibernate uses this name to identify the instance after creation. You can use the static method NHibernate.Impl.SessionFactoryObjectFactory. GetNamedInstance() to retrieve it. This feature may be useful when you re sharing a SessionFactory between loosely coupled components. But it s seldom used because, most of the time, it s better to hide NHibernate behind the persistence layer.
Now that you have a functional NHibernate application, you ll start encountering runtime errors. To ease the debugging process, you need to log NHibernate operations.
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