Hibernate基本的CRUD操作实例(更新,保存,删除,查询)

package org.Rudiment.hibernate;

import java.util.Iterator;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class HibernateHandler {
   
    /* 插入新数据 */
    public static void InsertObejct(News n)
    {
        //创建一个配置对象
        Configuration conf = new Configuration();
        ServiceRegistry  sr = new ServiceRegistryBuilder()
        .applySettings(conf.getProperties())
        .buildServiceRegistry();
        //通过配置对象获得 SessionFactory
        SessionFactory sf = conf.configure().buildSessionFactory(sr);
        //通过 SessionFactory 获取到一个 Session
        Session sess = sf.openSession();
        //开始Session事务的会话
        Transaction tx = sess.beginTransaction();
        //设置这个实例的 title
        n.setTitle("hibernate框架1");
        //设置这个实例的 content
        n.setContent("hibernate框架插入的内容2");
        //保存实例
        sess.save(n);
        //提交事务
        tx.commit();
        //关闭会话
        sess.close();
        //关闭会话工厂
        sf.close();
    }
   
    /* 查询记录 */
    public News queryById(int id)
    {
        Configuration conf = new Configuration();
        ServiceRegistry  sr = new ServiceRegistryBuilder()
        .applySettings(conf.getProperties())
        .buildServiceRegistry();
        SessionFactory sf = conf.configure().buildSessionFactory(sr);
        Session sess = sf.openSession();
        String hql = "from News as n where n.id=?";
        Query query = sess.createQuery(hql);
        query.setInteger(0, id);
        List rsList = query.list();
        Iterator it=rsList.iterator();
        News news = null;
        while(it.hasNext())
        {
            news = (News)it.next();
        }
        sess.close();
       
        return news;
    }
   
    /* 更新记录 */
    public News updateById(int id)
    {
        News n = queryById(id);
        Configuration conf = new Configuration();
        ServiceRegistry  sr = new ServiceRegistryBuilder()
        .applySettings(conf.getProperties())
        .buildServiceRegistry();
        SessionFactory sf = conf.configure().buildSessionFactory(sr);
        Session sess = sf.openSession();
        Transaction t =  sess.beginTransaction();
        n.setTitle("修改了，我是" + id);
        n.setContent("内容也改了" + id + "!");
        sess.update(n);
        t.commit();
        sess.close();
       
        return queryById(id);
    }
   
    /* 删除记录 */
    public boolean deleteById(int id)
    {
        Configuration conf = new Configuration();
        ServiceRegistry  sr = new ServiceRegistryBuilder()
        .applySettings(conf.getProperties())
        .buildServiceRegistry();
        SessionFactory sf = conf.configure().buildSessionFactory(sr);
        Session sess = sf.openSession();
        String hql = "delete News as n where n=?";
        Query query = sess.createQuery(hql);
        query.setInteger(0, id);
        query.executeUpdate();
        sess.beginTransaction().commit();
       
        return true;
    }
   
    public static void main(String[] args)
    {
        long p_t = System.currentTimeMillis();
        for(int i=0; i<10; i++)
        {
            News n = new News();
            HibernateHandler.InsertObejct(n);
        }
        long l_t = System.currentTimeMillis();
        long useTime = (l_t - p_t)/ 1000;
        System.out.println("耗时: " + (useTime) + " 秒钟");
    }
}