配置jpa环境

<?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/persistence_1_0.xsd" version="1.0">  

<persistence-unit name="itcast" transaction-type="RESOURCE_LOCAL">  
   <properties>  
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />  
    <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver" />  
    <property name="hibernate.connection.username" value="root" />  
    <property name="hibernate.connection.password" value="admin" />  
    <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast?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="create-drop"/>  
   </properties>  
</persistence-unit>

</persistence>