1、编写组合主键的类

  • 该类必须实现Serializable接口;
  • 生成对应的get/set方法；
  • 最好实现equals和hashCode方法;
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public class ScoreId implements Serializable{
    private int stuId;//学生编号
    private int subjectId;//科目编号
    public int getStuId() {
        return stuId;
    }
    public void setStuId(int stuId) {
        this.stuId = stuId;
    }
    public int getSubjectId() {
        return subjectId;
    }
    public void setSubjectId(int subjectId) {
        this.subjectId = subjectId;
    }
}

2、在主类中引用对应组件

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/**
 * 成绩
 * */
public class Score {
    private ScoreId scoreId;
    private double result;//成绩
    
    public ScoreId getScoreId() {
        return scoreId;
    }
    public void setScoreId(ScoreId scoreId) {
        this.scoreId = scoreId;
    }
    public double getResult() {
        return result;
    }
    public void setResult(double result) {
        this.result = result;
    }
}

3、映射文件的编写

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<hibernate-mapping package="cn.siggy.pojo">
    <class name="Score">
        <composite-id name="scoreId" class="ScoreId">
            <key-property name="stuId"></key-property>
            <key-property name="subjectId"></key-property>
        </composite-id>
        <property name="result"/>
    </class>
</hibernate-mapping>

4、测试代码

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@Test
public void testSave() throws HibernateException{
    Session session = null;
    Transaction tx = null;
    try{
        session = HibernateUtil.getSession();
        tx = session.beginTransaction();

        Score s = new Score();
        ScoreId sid = new ScoreId();
        sid.setStuId(2);
        sid.setSubjectId(6);
        s.setResult(89);
        s.setScoreId(sid);

        session.save(s);

        tx.commit();

    }catch (HibernateException e) {
        if(tx!=null)
            tx.rollback();
        e.printStackTrace();
        throw e;
    }finally{
        HibernateUtil.closeSession();
    }
}