hibernate基于主键的双向多对多的关联映射

1、类Role 和Function类
Fole:
public class Role {
	private int id;
	private String name;
	private Set<Function> functions = new HashSet<Function>(0);
	//get…set

}

  Function:

public class Function {
	private int id;
	private String name;
	private String code;
	private String url;
	private Set<Role> roles = new HashSet<Role>(0);

	public Function() {
		// TODO Auto-generated constructor stub
	}
	public Function(String name, String code, String url) {
		super();
		this.name = name;
		this.code = code;
		this.url = url;
	}

	//get…set }

2、	映射文件
Role.hbm.xml
<hibernate-mapping package="cn.siggy.pojo">
	<class name="Role">
		<id name="id">
			<generator class="native"></generator>
		</id>
		<property name="name"/>
		<!-- 多对多 -->
		<set name="functions" table="role_func" cascade="save-update">
			<!-- 表示当前类 映射到关系表中的列-->
			<key column="rid"/>
			<!-- 所对应的另一方在关系表中的列 -->
			<many-to-many column="fid" class="Function"/>
		</set>
	</class>
</hibernate-mapping>
function.hbm.xml

<hibernate-mapping package="cn.siggy.pojo">
	<class name="Function">
		<id name="id">
			<!-- foreign表示引用外键 -->
			<generator class="native"/>
		</id>
		<property name="name"/>
		<property name="code"/>
		<property name="url"/>
<set name="roles" table="role_func" inverse="true">
			<key column="fid"/>
			<many-to-many column="rid" class="Role"/>
		</set>
	</class>
</hibernate-mapping>
3、	测试代码
@Test
	public void testSave() throws HibernateException, SerialException, SQLException{
		Session session = null;
		Transaction tx = null;
		try{
			session = HibernateUtil.getSession();
			tx = session.beginTransaction();
			Function f1 = new Function("用户管理","user_mag","userAction");
			Function f2 = new Function("角色管理","role_mag","roleAction");
			Function f3 = new Function("系统管理","sys_mag","sysAction");
			Function f4 = new Function("权限管理","prev_mag","prevAction");
			Role r1 = new Role();
			r1.setName("admin");
			r1.getFunctions().add(f1);
			r1.getFunctions().add(f2);
			r1.getFunctions().add(f3);
			r1.getFunctions().add(f4);
			Role r2 = new Role();
			r2.setName("vip");
			r2.getFunctions().add(f1);
			r2.getFunctions().add(f2);
			session.save(r1);
			session.save(r2);

			tx.commit();

		}catch (HibernateException e) {
			if(tx!=null)
				tx.rollback();
			e.printStackTrace();
			throw e;
		}finally{
			HibernateUtil.closeSession();
		}
	}
	@Test
	public void testGet(){
		Session session = null;
		Transaction tx = null;
		try{
			session = HibernateUtil.getSession();
			tx = session.beginTransaction();
			Role role = (Role)session.get(Role.class, 1);
			System.out.println("角色名："+role.getName());
			System.out.println("该角色所对应的权限：");
			for(Iterator<Function> iter = role.getFunctions().iterator();
					iter.hasNext();){
				Function func = iter.next();
				System.out.println(func.getName()+"---"+func.getCode());
			}
			//取数据
			tx.commit();
		}catch (HibernateException e) {
			if(tx!=null)
				tx.rollback();
			e.printStackTrace();
			throw e;
		}finally{
			HibernateUtil.closeSession();
		}
	}