Hibernate关联映射

标签：format   bsp   source   1.0   ssi   private   table   center   close   

1.单项多对一关联

首先创建实体类

public class Qx {

private int jdid;
private String jdname;
// Getters & Setters ...

}

public class Jd{

private int qxid;
private String qxname;

private Qx qx

 // Getters & Setters ..;

}

配置文件，下文省略

/span>
PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">


update
org.hibernate.dialect.MySQLDialect
jdbc:mysql://localhost:3306/head
com.mysql.jdbc.Driver
root
076634
true
true

2：双对多

public class Course {

private int courseid;
private String courseName;

private Set students = new HashSet();

public class Student {

//学生

private int studentid;
private String studentname;
private Set courses = new HashSet();

br> "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

br> "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

测试类

package cn.yunhe.test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import cn.yuhe.entity.Course;
import cn.yuhe.entity.Student;

public class Demo {

Session session = null;
Transaction tr = null;

@Before
public void setUp() {
Configuration config = new Configuration().configure();
SessionFactory factory = config.buildSessionFactory();
session = factory.openSession();
tr = session.beginTransaction();
}

@Test
public void manyTomany(){

Course course1 = new Course();
Course course2 = new Course();

course1.setCourseName("java");
course2.setCourseName("c");

session.save(course1);
session.save(course2);

Student stu1 = new Student();
Student stu2 = new Student();

stu1.setStudentName("小样");
stu2.setStudentName("集雨");

stu1.getCourses().add(course1);
stu1.getCourses().add(course2);
stu2.getCourses().add(course1);
stu2.getCourses().add(course2);

session.save(stu1);
session.save(stu2);
tr.commit();
}

@After
public void tearDown() {
session.close();
}

}

Hibernate关联映射

标签：format   bsp   source   1.0   ssi   private   table   center   close   

原文地址：http://www.cnblogs.com/lxiaoyang/p/7123648.html