hibernate-关系映射-多对多（双向）-12

annotation方式：

@Entitypublic class Teacher {    private int id;    private Set<Student> students = new HashSet<Student>();    @ManyToMany    @JoinTable(name = "t_s",            joinColumns={@JoinColumn(name = "teacher_id")},            inverseJoinColumns = {@JoinColumn(name = "student_id")})    public Set<Student> getStudents() {        return students;    }    public void setStudents(Set<Student> students) {        this.students = students;    }    @Id    @GeneratedValue    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }}

@Entitypublic class Student {    private int id;    private Set<Teacher> teachers = new HashSet<Teacher>();    @ManyToMany(mappedBy = "students")    public Set<Teacher> getTeachers() {        return teachers;    }    public void setTeachers(Set<Teacher> teachers) {        this.teachers = teachers;    }    @Id    @GeneratedValue    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }}

xml方式：

<hibernate-mapping package="hibernate">    <class name="hibernate.Teacher">        <id name="id" >            <generator class="native"/>        </id>        <set name="students" table="t_s">            <key column="teacher_id"></key>            <many-to-many class="hibernate.Student" column="student_id"/>        </set>    </class></hibernate-mapping>

<hibernate-mapping package="hibernate">    <!--table 属性不配就是默认-->    <class name="hibernate.Student" >        <id name="id" >            <generator class="native"/>        </id>        <set name="teachers" table="t_s">            <key column="student_id"></key>            <many-to-many class="hibernate.Teacher" column="teacher_id"/>        </set>    </class></hibernate-mapping>