Student<------>Course:
1.Student.hbm.xml:
@H_502_4@<hibernate-mapping package="com.buaa.hibernate.bean"> <class name="Student"> <id name="id" column="id"> <generator class="native"></generator> </id> <property name="sname" column="stu_name"></property> <set name="courses" table="stu_course" inverse="true"> <key column="stu_id"></key> <many-to-many class="Course" column="course_id"></many-to-many> </set> </class> </hibernate-mapping>2.Course.hbm.xml:
@H_502_4@<hibernate-mapping package="com.buaa.hibernate.bean"> <class name="Course"> <id name="id" column="id"> <generator class="native"></generator> </id> <property name="cname" column="course_name"></property> <set name="students" table="stu_course"> <key column="course_id"></key> <many-to-many class="Student" column="stu_id"></many-to-many> </set> </class> </hibernate-mapping>☆☆☆ 注意：inverse属性：只能有一个设置为true。也不能都不设置，否则会报异常（
1、Duplicate entry'2-2' for key 'PRIMARY'；
2、Could notsynchronize database state with session；
2、ConstrainViolationException:Could not execute JDBC batch update；）
3.Test测试类：
@H_502_4@public class Test extends TestCase { public void testMTM(){ //MySessionFactory是自己写的一个类，获取session Session session = MySessionFactory.getSession(0); Student stu = new Student(); stu.setSname("jack"); Student stu2 = new Student(); stu2.setSname("simon"); Course course = new Course(); course.setCname("English"); Course course2 = new Course(); course2.setCname("Math"); Set<Course> courses = new HashSet<Course>(); courses.add(course); courses.add(course2); Set<Student> students = new HashSet<Student>(); students.add(stu); students.add(stu2); stu.setCourses(courses); stu2.setCourses(courses); course.setStudents(students); course2.setStudents(students); session.save(course); session.save(course2); session.save(stu); session.save(stu2); session.beginTransaction().commit(); session.close(); } }4.控制台输出：
Hibernate: insert into Course (course_name) values (?) Hibernate: insert into Course (course_name) values (?) Hibernate: insert into Student (stu_name) values (?) Hibernate: insert into Student (stu_name) values (?) Hibernate: insert into stu_course (course_id,stu_id) values (?,?) Hibernate: insert into stu_course (course_id,?)
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