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;
}
}
private Integer id;
private String name;
private Set<Player> players;
//一系列的setter.getter方法
@Override
public String toString() {
return "Role: " + name;
}
}
<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>
<id name="id" length="4">
<generator class="native"></generator>
</id>
<property name="name" length="10"></property>
<set name="players" table="sxt_hibernate_player_role" cascade="save-update">
<!-- 注意这里指定的外键要和另一端映射文件中的相对应 -->
<key column="role_id"></key>
<!-- 注意这里指定的外键要和另一端映射文件中的相对应 -->
<many-to-many class="com.sxt.hibernate.many2many.entity.Player" column="player_id"></many-to-many>
</set>
</class>
Session session = HibernateUtils.getSession();
Transaction t = session.beginTransaction();
try {
/**
* 测试插入数据
*/
/* Player player1=new Player();
player1.setName("姚明");
Player player2=new Player();
player2.setName("詹姆斯");
Player player3=new Player();
player3.setName("科比");
Role role1=new Role();
role1.setName("中锋");
Set<Player> players1=new HashSet<Player>();
players1.add(player1);
players1.add(player2);
role1.setPlayers(players1);
Role role2=new Role();
role2.setName("后卫");
Set<Player> players2=new HashSet<Player>();
players2.add(player2);
players2.add(player3);
role2.setPlayers(players2);
session.save(role1);
session.save(role2);*/
/**
* 测试加载数据
*/
Role role=(Role)session.load(Role.class, 4);
System.out.println(role);
for(Iterator<Player> players=role.getPlayers().iterator();players.hasNext();){
System.out.println(players.next());
}
t.commit();
} catch (HibernateException e) {
e.printStackTrace();
t.rollback();
} finally {
HibernateUtils.closeSession(session);
}
}
}