NHibernate配置及映射文件

配置NHibernate有三种常见的配置方法。 
  1：在web.config,App.config里面配置 

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

<!-- Add this element -->

<configSections>

<section

name="hibernate-configuration"

type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate"

/>

</configSections>

<!-- Add this element -->

<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">

<session-factory>

<property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property>

<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>

<property name="connection.connection_string">Server=TLSZ207\SQLEXPRESS;initial catalog=Test;Integrated Security=true</property>

</session-factory>

</hibernate-configuration>

<!-- Leave the system.web section unchanged -->

<system.web>

</system.web>

</configuration>

  则需要这样实例化Configuration对象。 
  NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration(); 
  这种配置方法将会到应用程序配置文件（App.Config,Web.Config）中查找NHibernate的配置信息. 

  2：hibernate.cfg.xml 
  建立名为hibernate.cfg.xml的文件。实例化Configuration config = new Configuration().Configure();这样NHibernate将会在目录下寻找hibernate.cfg.xml的配置文件。 
  hibernate.cfg.xml的格式 

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-configuration  xmlns="urn:nhibernate-configuration-2.0" >

<session-factory name="MySessionFactory">

<property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property>

<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>

<property name="connection.connection_string">Server=TLSZ207\SQLEXPRESS;initial catalog=Test;Integrated Security=true</property>

</session-factory>

</hibernate-configuration>

  指明配置文件 
  Configuration config = new Configuration().Configure(configFileName); 
  这种配置方法将查找指定的Hibernate标准配置文件，可以是绝对路径或者相对路径。还可以通过编码的方式来添加配置信息： 
  IDictionary props = new Hashtable(); 
  props[“dialect”] = "NHibernate.Dialect.MsSql2005Dialect"; 
... 
  Configuration cfg = new Configuration(); 
  cfg.Properties = props;//cfg.AddProperties(props); 


  映射文件： 
  所有的XML映射都需要使用nhibernate-mapping-2.0 schema。目前的schema可以在NHibernate的资源路径或者是NHibernate.dll的嵌入资源（Embedded Resource）中找到。NHibernate总是会优先使用嵌入在资源中的schema文件。你可以将hibernate-mapping拷贝到C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Packages\schemas\xml路径中，以获得智能感知功能。 

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Test" assembly="Test">

<class name="Test.Cat,Test" table="Cat">

<id name="CatID">

<column name="CatID" sql-type="char(32)" not-null="true"/>

<generator class="uuid.hex" />

</id>

<property name="Name">

<column name="Name" length="16" not-null="true" />

</property>

<property name="Sex" />

<property name="Weight" />

</class>

</hibernate-mapping>