（九）Hibernate 的复合主键

package action;

import java.io.Serializable;

import org.hibernate.Session;
import org.hibernate.Transaction;

import bean.Score;
import bean.ScoreId;
import util.HibernateUtil;

public class Test_CompositeId {

    public static void main(String[] args) {
        // Test_CompositeId.select();

        // Test_CompositeId.save();

        Test_CompositeId.update();
    }

    /**
     * 查找
     */
    private static void select() {

        Session session = null;
        Transaction tran = null;

        ScoreId id = new ScoreId();
        id.setUserid(1);
        id.setSubject("语文");

        try {
            session = HibernateUtil.getSessionFactory().getCurrentSession();
            tran = session.beginTransaction();

            Score score = (Score) session.get(Score.class, id);

            System.out.println("成绩=" + score.getScore());

            tran.commit();
        } catch (Exception e) {
            e.printStackTrace();
            tran.rollback();
        }

    }

    private static void save() {
        Session session = null;
        Transaction tran = null;

        ScoreId id = new ScoreId();
        id.setSubject("英语");
        id.setUserid(1);

        Score score = new Score();
        score.setId(id);
        score.setScore(100);

        try {
            session = HibernateUtil.getSessionFactory().getCurrentSession();
            tran = session.beginTransaction();

            Serializable primarykey = session.save(score);
            System.out.println(primarykey);

            tran.commit();
        } catch (Exception e) {
            e.printStackTrace();
            tran.rollback();
        }
    }

    /**
     * 执行更新操作
     */
    private static void update() {

        Session session = null;

        Transaction tran = null;

        ScoreId id=new ScoreId();
        id.setUserid(1);
        id.setSubject("英语");
        
        Score score=new Score();
        score.setId(id);
        score.setScore(12);
        
        try {
            session = HibernateUtil.getSessionFactory().getCurrentSession();
            tran = session.beginTransaction();
            
            session.update(score);
            
            
            tran.commit();
        } catch (Exception e) {
            e.printStackTrace();
            tran.rollback();
        }

    }

}