persistence.xml介绍 

 1 <persistence>
 2     <persistence-unit name="OrderManagement">
 3         <description>This unit manages orders and customers.
 4             It does not rely on any vendor-specific features and   can
 5             therefore be deployed to any persistence provider.
 6         </description>
 7         <jta-data-source>jdbc/MyOrderDB</jta-data-source>
 8         <jar-file>MyOrderApp.jar</jar-file>
 9         <class>com.widgets.Order</class>
10         <class>com.widgets.Customer</class>
11     </persistence-unit>
12 </persistence>



这个文件定义了一个持久化单元命名OrderManagement，它使用一个JTA感知数据源
jdbc / MyOrderDB。该JAR文件和类元素指定管理的持久性类：实体类，可嵌入类和
映射超类。该JAR文件元素指定的JAR文件是可见的包装持久化单元包含管理的持久
性类，而类元素明确名称管理的持久性类。
其实，如果你不介意不符合规范，Hibernate支持在Java SE自动检测均匀。要做到这
一点，添加hibernate.archive.autodetection属性：

 1 <persistence-unit name="eventractor" transaction-type="RESOURCE_LOCAL">
 2   <!-- This is required to be spec compliant, Hibernate however supports
 3        auto-detection even in JSE.
 4   <class>pl.michalmech.eventractor.domain.User</class>
 5   <class>pl.michalmech.eventractor.domain.Address</class>
 6   <class>pl.michalmech.eventractor.domain.City</class>
 7   <class>pl.michalmech.eventractor.domain.Country</class>
 8    -->
 9 
10   <properties>
11     <!-- Scan for annotated classes and Hibernate mapping XML files -->
12     <property name="hibernate.archive.autodetection" value="class, hbm"/>
13 
14     <property name="hibernate.hbm2ddl.auto" value="validate" />
15     <property name="hibernate.show_sql" value="true" />
16   </properties>
17 </persistence-unit>
posted @ 2011-07-04 15:40  5271  阅读(233)  评论(0)    收藏  举报