hibernate联合主键全攻略

<!DOCTYPE hibernate-mapping PUBLIC 
"-//Hibernate/Hibernate Mapping DTD//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > 

<hibernate-mapping package="classweb.model.po"> 
<class 
   name="Users" 
   table="USERS" 
> 
   <meta attribute="sync-DAO">false</meta> 
   <composite-id name="id" class="UsersPK"> 
    <key-property 
     name="name" 
     column="NAME" 
     type="string" 
    /> 
    <key-property 
     name="tel" 
     column="TEL" 
     type="string" 
    /> 
   </composite-id> 

   <property 
    name="age" 
    column="AGE" 
    type="string" 
    not-null="false" 
   />