13_多对多(双向)关联映射.txt

hibernate 映射文件笔记 希望对大家有所帮助

            

                   多对多关联映射 双向(User<--->Role)

                       【彼此持有对方对象的集合】


           Role 
	
	private int id;
	
	private String name;
	
	private Set<User> user;

#########################################

<hibernate-mapping>
     <class name="com.tcit.hibernate.Role">
     	<id name="id">
	   <generator class="native"/>
	</id>
	<property name="name"/>
		
         <set name="user" table="role_user" order-by="userid">         <!-- order-by  根据userid排序 -->
           <key column="roleid"/>
           <many-to-many class="com.tcit.hibernate.User" column="userid"/>      
         </set>
         
     </class>
</hibernate-mapping>
======================================================


            User 
	
	private int id;
	
	private String name;
	
	private Set<Role> role;

#########################################

<hibernate-mapping >
     <class name="com.tcit.hibernate.User">
     	<id name="id">
	    <generator class="native"/>
	</id>
		<property name="name"/>
		
		<set name="role" table="role_user">
		   <key column="userid"/>
		   <many-to-many class="com.tcit.hibernate.Role" column="roleid"/>
		</set>

     </class>
</hibernate-mapping>