这里与多对多不同的是借用了一个中间类StudentCourse来达到把多对多的问题转换为多对一的问题，下面来举例具体介绍：
先看看三个最重要的xxx.hbm.xml文件内部信息
Student.hbm.xml
< xml version="1.0" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
Course.hbm.xml
< xml version="1.0" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
StudentCourse.hbm.xml
< xml version="1.0" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
再看看测试文件TestApp.java
package com.hbsi.many2manyTOone2many;
import java.util.Set;
import org.hibernate.Session;
import org.junit.Test;
import com.hbsi.utils.HibernateSessionFactory;
public class TestApp {
Session session = HibernateSessionFactory.getSession();
@Test
public void add(){
session.beginTransaction();
Student stu = new Student();
stu.setName("keven");
Course c1 = new Course();
c1.setName("java");
Course c2 = new Course();
c2.setName("
mysql");
StudentCourse sc1 = new StudentCourse();
sc1.setS(stu);
sc1.setC(c1);
sc1.setScore(99);
session.save(sc1);
StudentCourse sc2 = new StudentCourse();
sc2.setS(stu);
sc2.setC(c2);
sc2.setScore(89);
session.save(sc2);
session.getTransaction().commit();
HibernateSessionFactory.closeSession();
}
@Test
public void find(){
Student stu = (Student) session.get(Student.class,1);
Set scs = stu.getSc();
for(StudentCourse sc : scs){
System.out.println(sc.getS().getName()+":"+sc.getC().getName()+"---"+sc.getScore());
}
}
}