hibernate 聯合主鍵

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xml配置

需要一個主鍵類:

package com.bxw.entity;import java.io.Serializable;public class StudentPk implements Serializable{    private String id;    private String name;    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }        @Override    public boolean equals(Object obj) {        if(obj instanceof StudentPk){            StudentPk pk = (StudentPk)obj;            if(this.name.equals(pk.getName()) && this.id.equals(pk.getId())){                return true;            }            return false;        }        return false;    }        @Override    public int hashCode() {        return this.id.hashCode();    }}

該主鍵類必須implements序列化的Serializable介面；

該主鍵類必須重寫equals()、hashCode()方法。

 

實體：

package com.bxw.entity;public class Student {    private StudentPk pk;    private String sex;        public StudentPk getPk() {        return pk;    }    public void setPk(StudentPk pk) {        this.pk = pk;    }    public String getSex() {        return sex;    }    public void setSex(String sex) {        this.sex = sex;    }        }

設定檔

<?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">  <hibernate-mapping package="com.bxw.entity">     <class name="Student">        <composite-id name="pk" class="com.bxw.entity.StudentPk">          <key-property name="id"></key-property>        <key-property name="name"></key-property>      </composite-id>              <property name="sex"></property>     </class></hibernate-mapping>  

 

hibernate 聯合主鍵