Hibernate基于XML的----联合主键配置

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基于XML配置实现联合主键

部门hibernate配置代码省略了

配置文件内容：

利用标签composite-id

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!--     Mapping file autogenerated by MyEclipse Persistence Tools--><hibernate-mapping>    <class name="com.chaosju.po.Student" table="student" schema="user">         <span style="color:#ff0000;"><composite-id class="com.chaosju.po.StudentPK" name="pk">        <key-property name="id"/>         <key-property name="name"/>         </composite-id></span>        <property name="age" > </property>  <property name="sex" > </property>       </class></hibernate-mapping>

测试类：主键类

package com.chaosju.po;import java.io.Serializable;/*

主键类要注意一下两点

1.继承Serializable接口

2.重写equls方法和hashcode方法

*/public class StudentPK implements  Serializable{private int id;private String name;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;}@Overridepublic boolean equals(Object obj) {if(obj instanceof StudentPK){StudentPK pk = (StudentPK)obj;if(this.id ==pk.getId()&&this.name.equals(pk.getName()) ){return true;}}return false;}@Overridepublic int hashCode() {return this.name.hashCode();}}

测试类：po类

package com.chaosju.po;public class Student {private StudentPK pk;private int age;private String sex;public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public StudentPK getPk() {return pk;}public void setPk(StudentPK pk) {this.pk = pk;}}

主要测试类

import org.hibernate.Session;import com.chaosju.po.Student;import com.chaosju.po.StudentPK;import com.chaosju.util.HibernateUtil;public class Test {public static void main(String[] args) {Student student = new Student();StudentPK pk = new StudentPK();pk.setId(33);pk.setName("juchao");student.setPk(pk);student.setAge(13);student.setSex("sex");//创建sessionSession session = HibernateUtil.getSession();//开启事务session.beginTransaction();//保存数据session.save(student);//事务提交session.getTransaction().commit();session.close();}

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