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;}
}

/*** 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;}
}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.siggy.pojo"><class name="Score"><!-- 组合主键 --><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>

package cn.siggy.test;import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.Test;import cn.siggy.pojo.Score;
import cn.siggy.pojo.ScoreId;
import cn.siggy.util.HibernateUtil;public class HibernateTest {@Testpublic void testCreateDB(){Configuration cfg = new Configuration().configure();SchemaExport se = new SchemaExport(cfg);//第一个参数 是否生成ddl脚本  第二个参数  是否执行到数据库中se.create(true, true);}@Testpublic 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();}}
}