hibernate映射关系（多对多）

1 public class Student {
2     private int id;
3     private String name;
4     private Set<Teacher> teachers = new HashSet<Teacher>();    
5 }

1 public class Teacher {
2     private int id;
3     private String name;
4     private Set<Student> students = new HashSet<Student>();
5 }

 1 <hibernate-mapping package="entity">
 2     <class name="Student">
 3         <id name="id">
 4             <generator class="native"/>
 5         </id>
 6         <property name="name"/>
 7         <!--
 8             <set>标签的table属性：    配置关系表的名称
 9             <key>标签的column属性：    当前实体对应数据库表的外键字段名
10             <many-to-many>标签表示多对多关系，属性：
11                 class属性：    表示对方的类名
12                 column属性： 表示对方的表在关系表中的外键字段名
13         -->
14         <set name="teachers" table="StudentTeacher" cascade="save-update">
15             <key column="studentId"/>
16             <many-to-many class="Teacher" column="teacherId" />
17         </set>
18     </class>
19 </hibernate-mapping>

 1 <hibernate-mapping package="entity">
 2     <class name="Teacher">
 3         <id name="id">
 4             <generator class="native"/>
 5         </id>
 6         <property name="name"/>
14         <set name="students"  table="StudentTeacher" cascade="save-update">
15             <key column="teacherId"/>
16             <many-to-many class="Student" column="studentId" />
17         </set>
18     </class>
19 </hibernate-mapping>