Hibernate关联关系配置-----基于连接表的双向多对多配置

实体：

package bi.many2many.jointable;

import java.util.HashSet;
import java.util.Set;

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

	public Student() {

	}

	public Student(int id, String name, Set<Teacher> teachers) {
		super();
		this.id = id;
		this.name = name;
		this.teachers = teachers;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Set<Teacher> getTeachers() {
		return teachers;
	}

	public void setTeachers(Set<Teacher> teachers) {
		this.teachers = teachers;
	}

}

package bi.many2many.jointable;

import java.util.HashSet;
import java.util.Set;

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

	public Teacher() {

	}

	public Teacher(int id, String name, Set<Student> students) {
		super();
		this.id = id;
		this.name = name;
		this.students = students;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Set<Student> getStudents() {
		return students;
	}

	public void setStudents(Set<Student> students) {
		this.students = students;
	}

}

　　

hbm映射文件：

<hibernate-mapping>
	<class name="bi.many2many.jointable.Student">
		<id name="id" column="sid">
			<generator class="native" />
		</id>
		<property name="name" type="string" column="name"></property>
		
		<set name="teachers" table="studentteacher">
			<key column="sid"></key>
			<many-to-many class="bi.many2many.jointable.Teacher" column="tid"></many-to-many>
		</set>
	</class>

</hibernate-mapping>

<hibernate-mapping>
	<class name="bi.many2many.jointable.Teacher">
		<id name="id" column="tid">
			<generator class="native" />
		</id>
		<property name="name" type="string" column="name"></property>
		
		<set name="students" table="studentteacher" inverse="true">
			<key column="tid"></key>
			<many-to-many class="bi.many2many.jointable.Student" column="sid"></many-to-many>
		</set>
	</class>

</hibernate-mapping>

　　

测试文件：

public class Test {
	@org.junit.Test
	public void testAdd() {
		SessionFactory sf = HibernateUtil.getSessionFactory();
		Session session = sf.getCurrentSession();
		session.beginTransaction();
		Teacher t1 = new Teacher();
		t1.setName("李刚");
		
		Teacher t2 = new Teacher();
		t2.setName("张孝祥");
		
		Teacher t3 = new Teacher();
		t3.setName("马士兵");
		
		Student s1 = new Student();
		s1.setName("张三");
		s1.getTeachers().add(t1);
		s1.getTeachers().add(t2);
		s1.getTeachers().add(t3);
		
		Student s2 = new Student();
		s2.setName("李四");
		s2.getTeachers().add(t3);
		s2.getTeachers().add(t2);
			
		session.save(t1);
		session.save(t2);
		session.save(t3);
		session.save(s1);
		session.save(s2);
		session.beginTransaction().commit();
	}
}

　　

测试结果：

Hibernate: insert into Teacher (name) values (?)
Hibernate: insert into Teacher (name) values (?)
Hibernate: insert into Teacher (name) values (?)
Hibernate: insert into Student (name) values (?)
Hibernate: insert into Student (name) values (?)
Hibernate: insert into studentteacher (sid, tid) values (?, ?)
Hibernate: insert into studentteacher (sid, tid) values (?, ?)
Hibernate: insert into studentteacher (sid, tid) values (?, ?)
Hibernate: insert into studentteacher (sid, tid) values (?, ?)
Hibernate: insert into studentteacher (sid, tid) values (?, ?)