handler.java

这个是j2eejava web 编程精要十五讲的全部源码。对学习java web编程的人来说是很能得的资料

package model;

import java.util.*;
import org.hibernate.*;
import hibernate_tier.HibernateUtil;
import hibernate_tier.Train;
import org.apache.log4j.*;

public class Handler {

    Query query;

    Logger log = Logger.getLogger("Handler.class");

    Session session;
     Transaction tx;
     Train t = new Train();

     public Train getQueryResult(String code) {
        session = HibernateUtil.currentSession(); //生成Session实例
        tx = session.beginTransaction();


           try {
          query = session.createQuery("from Train t where t.trainCode=?");
          query.setString(0,code);
         List list = query.list();
         for(int i=0;i<list.size();i++) {
           t = (Train) list.get(i);
         }
        tx.commit(); //提交到数据库
        log.info("Obtain data successfully!");
        session.close();
        return t;
        }catch (HibernateException e) {
        e.printStackTrace();
        log.error("error:",e);
        tx.rollback();
        return null;
       }
    }



}