hibernate入门

package com.test;



import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.hibernate.Usertest.Usertest;

public class Test {
    public static void main(String[] args) {
        String hql="from Usertest where id=?";
        String[] parm={"2"};
        List<Usertest> list=chaxun(hql,parm);
        for(Usertest u:list){
            System.out.println(u.getId()+"/"+u.getName()+"/"+u.getPassword());
        }
    }
//添加
    public static void tianjia(Usertest um) {
        SessionFactory sf = new Configuration().configure()
                .buildSessionFactory();
        Session s = null;
        Transaction t = null;

        try {
            // 准备数据
            s = sf.openSession();
            t = s.beginTransaction();
            s.save(um);
            t.commit();
        } catch (Exception err) {
            t.rollback();
            err.printStackTrace();
        } finally {
            s.close();
        }
    }
    //查询
    public static List<Usertest> chaxun(String hql,String[] parm){
        List<Usertest> list=null;
        
        SessionFactory sf = new Configuration().configure()
                .buildSessionFactory();
        Session s = null;
        
        try {
            s = sf.openSession();
            Query query=s.createQuery(hql);
            if(parm!=null&&parm.length>0){
                for(int i=0;i<parm.length;i++){
                    query.setString(i,parm[i]);
                }
            }
            list=query.list();

        } catch (Exception e) {
            e.printStackTrace();
        
            // TODO: handle exception
        }finally{
            if(s!=null&&s.isOpen()){
                s.close();
            }
        }
        return list;
    }
}