多对多: 学生与课程,以下主要从案例出发，由案例具体解析
单向多对多
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">
测试类 www.2cto.com
package com.hbsi.many2many;
import java.util.HashSet;
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 student1 = new Student();
student1.setName("keven");
Student student2 = new Student();
student2.setName("jie");
Course course1 = new Course();
course1.setName("english");
Course course2 = new Course();
course2.setName("chinese");
Set courses = new HashSet();
courses.add(course1);
courses.add(course2);
student1.setCourse(courses);
session.save(student1);
session.save(student2);
session.save(course1);
session.save(course2);
session.getTransaction().commit();
HibernateSessionFactory.closeSession();
}
@Test
public void find(){
Student student = (Student) session.get(Student.class,1);
Set courses = student.getCourse();
for(Course course : courses){
System.out.println(student.getName()+"---"+course.getName());
}
}
}
双向多对多
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">
测试类
package com.hbsi.many2manyboth;
import java.util.HashSet;
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 student1 = new Student();
student1.setName("keven");
Student student2 = new Student();
student2.setName("jie");
Course course