hibernate映射关系（多对多）

Student与Teacher关系多对多(只建了2个实体类)

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

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

多对多

<hibernate-mapping package="entity">
    <class name="Student">
        <id name="id">
            <generator class="native"/>
        </id>
        <property name="name"/>
        <!--
            <set>标签的table属性：    配置关系表的名称
            <key>标签的column属性：    当前实体对应数据库表的外键字段名
            <many-to-many>标签表示多对多关系，属性：
                class属性：    表示对方的类名
                column属性： 表示对方的表在关系表中的外键字段名
        -->
        <set name="teachers" table="StudentTeacher" cascade="save-update">
            <key column="studentId"/>
            <many-to-many class="Teacher" column="teacherId" />
        </set>
    </class>
</hibernate-mapping>

<hibernate-mapping package="entity">
    <class name="Teacher">
        <id name="id">
            <generator class="native"/>
        </id>
        <property name="name"/>
        <set name="students"  table="StudentTeacher" cascade="save-update">
            <key column="teacherId"/>
            <many-to-many class="Student" column="studentId" />
        </set>
    </class>
</hibernate-mapping>