true

com.mysql.jdbc.Driver

thread

jdbc:mysql://localhost:3306/test

root
123 

org.hibernate.dialect.MySQLDialect

my

最后創(chuàng)建一個(gè)測(cè)試類 Test.java 代碼如下，里邊有注釋說明

package cn.com.nick.hbm;

import java.util.Date;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

public class Test
{

private static final SessionFactory sessionFactory;

static
{
try
{
// 這里創(chuàng)建了SessionFactory 將hibernate.cfg.xml文件放到SRC的跟路徑下
// Hibernate會(huì)自己找到
sessionFactory = new Configuration().configure()
  .buildSessionFactory();
} catch (Throwable ex)
{
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}

public static SessionFactory getSessionFactory()
{
return sessionFactory;
}

public static void main(String[] args)
{
// 實(shí)例化一個(gè)新的News對(duì)象，并填充內(nèi)容
News news = new News();
news.setTitle("測(cè)試標(biāo)題");
news.setContent("添加測(cè)試內(nèi)容");
news.setDate(new Date());

Test t = new Test();
// 調(diào)用Test類下的存儲(chǔ)方法,相當(dāng)于執(zhí)行INSERT語句
// t.Save(news);
// 調(diào)用查詢方法,顯示數(shù)據(jù)庫(kù)的內(nèi)容
t.select();
// 調(diào)用更新方法
// t.update();
// 調(diào)用刪除
// t.delete();
}

/**
* 一個(gè)簡(jiǎn)單的添加數(shù)據(jù)方法
* @param news news對(duì)象，這個(gè)對(duì)象將被添加到庫(kù)中
*/
public void Save(News news)
{
try
{
//獲取hibernate的session
Session session = Test.getSessionFactory().getCurrentSession();
session.beginTransaction();
//這里只需要調(diào)用save方法把news對(duì)象傳進(jìn)去就插入成功了！
session.save(news);
session.getTransaction().commit();

} catch (HibernateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}

}

/**
* 查詢方法
*/
public void select()
{
try
{
Session session = Test.getSessionFactory().getCurrentSession();
session.beginTransaction();
//注意！！！這里的 News 不是表名稱！ 是對(duì)象名所以要注意大小寫 
String sql=" from News";
//帶條件的查詢
//String sql="from News where id=1";

//用session.createQuery（）執(zhí)行HQL查詢語句
List l = session.createQuery(sql).list();
//在控制臺(tái)循環(huán)輸出
for (News n : l)
{
 System.out.println(n.getId());
 System.out.println(n.getTitle());
 System.out.println(n.getContent());
 System.out.println(n.getDate());
 System.out.println("==============");
}
session.getTransaction().commit();

} catch (HibernateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}

/**
* 更新方法
*/
public void update()
{
try
{
Session session = Test.getSessionFactory().getCurrentSession();
session.beginTransaction();
//定義了要裝載對(duì)象的ID
Integer id = 1;
//用load方法裝載一個(gè)對(duì)象進(jìn)來
News n = (News) session.load(News.class, new Integer(id));
//重新設(shè)置這個(gè)對(duì)象的標(biāo)題
n.setTitle("更新后標(biāo)題");
//用update方法更新這個(gè)對(duì)象
session.update(n);
session.getTransaction().commit();
} catch (HibernateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void delete()
{
try
{
Session session = Test.getSessionFactory().getCurrentSession();
session.beginTransaction();
//定義了要裝載對(duì)象的ID
Integer id = 6;
//用load方法裝載一個(gè)對(duì)象進(jìn)來
News n = (News) session.load(News.class, new Integer(id));
//用delete方法刪除這個(gè)對(duì)象
session.delete(n);
session.getTransaction().commit();
} catch (HibernateException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}