JPA配置示例

<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
          http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
        version="2.0">
<!-- 可配置多个存储单元 -->
<persistence-unit name="jetty" transaction-type="JTA">
<jta-data-source>java:MEJB</jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
<property name="hibernate.connection.driver_class" value="org.gjt.mm.mysqlDriver" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="12356" />
<property name="hibernate.connection.url"
value="jdbc.mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8" />
<property name="hibernate.max_fetch_depth" value="3" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>

</persistence-unit>
</persistence>