private Integer id;
private String name;
//一系列的setter.getter方法
@Override
public String toString() {
return "Role:" + name;
}
}
private Integer id;
private String name;
private Set<Role> roles;
//一系列的setter.getter方法
@Override
public String toString() {
return "Player:" + name;
}
}
<id name="id" length="4">
<generator class="native"></generator>
</id>
<property name="name" length="10"></property>
</class>
<id name="id" length="4">
<generator class="native"></generator>
</id>
<property name="name" length="10"></property>
<!--table="sxt_hibernate_user_role"含义,用来指定中间表 -->
<set name="roles" table="sxt_hibernate_player_role" cascade="save-update">
<!--<key column="user_id">含义,指定中间表中用来指向本表的外键 -->
<key column="player_id"></key>
<!-- column含义,用来指定中间表中用来指向另一端表的外键 -->
<many-to-many class="com.sxt.hibernate.many2many.entity.Role" column="role_id"></many-to-many>
</set>
</class>
Session session = HibernateUtils.getSession();
Transaction t = session.beginTransaction();
try {
/**
* 测试插入数据
*/
/* Role role1=new Role();
role1.setName("后卫");
Role role2=new Role();
role2.setName("前锋");
Role role3=new Role();
role3.setName("中锋");
Player player1=new Player();
player1.setName("姚明");
Set<Role> roles1=new HashSet<Role>();
roles1.add(role3);
player1.setRoles(roles1);
Player player2=new Player();
player2.setName("詹姆斯");
Set<Role> roles2=new HashSet<Role>();
roles2.add(role1);
roles2.add(role2);
roles2.add(role3);
player2.setRoles(roles2);
//能正确保存.每保存player后,都要级联保存它的role,并且级联插入中间表记录.
session.save(player1);
session.save(player2);*/
/**
* 测试加载数据
*/
Player player=(Player)session.load(Player.class, 1);
System.out.println(player);
for(Iterator<Role> iterator=player.getRoles().iterator();iterator.hasNext();){
System.out.println(iterator.next());
}
t.commit();
} catch (HibernateException e) {
e.printStackTrace();
t.rollback();
} finally {
HibernateUtils.closeSession(session);
}
}
}