hibernate——helloworld

最新推荐文章于 2020-01-05 00:25:42 发布

转载最新推荐文章于 2020-01-05 00:25:42 发布 · 395 阅读

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本文介绍了一个简单的Java应用程序如何利用Hibernate框架实现用户的增删改查(CRUD)操作。通过具体的代码示例展示了如何配置Hibernate连接数据库、保存及获取User对象。

package cn.icss.a_helloworld;

public class User {
   private int id;
   private String name;
   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   @Override
   public String toString() {
       return "[User: id="+id+",name="+name+"]";
   }


}

====================================

package cn.icss.a_helloworld;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

public class App {
   private static SessionFactory sessionFactory;
   static{
       Configuration cfg = new Configuration();
       cfg.configure("hibernate.cfg.xml");//读取指定的主配置文件
       sessionFactory = cfg.buildSessionFactory();//根据配置生成session工厂
   }

   @Test
   public void testSave(){
       User user = new User();
       user.setName("zhangsan");

       //保存?
       Session session = sessionFactory.openSession();//打开一个新的session
       Transaction tx = session.beginTransaction();//开始事务

       session.save(user);

       tx.commit();//提交事务

       session.close();//关闭session,释放资源
   }

   @Test
   public void testGet(){
       Session session = sessionFactory.openSession();
       Transaction tx = session.beginTransaction();


       User user = (User) session.get(User.class, 2);//获取
       System.out.println(user);

       tx.commit();
       session.close();
   }
}

=========================================

<!DOCTYPE hibernate-configuration PUBLIC
   "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
   "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
   <session-factory name="foo">
       
       <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
       <property name="connection.url">jdbc:mysql:///hibernate_20140422</property>
       <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
       <property name="connection.username">root</property>
       <property name="connection.password">root</property>
       
       
       <property name="show_sql">true</property>
       
       <mapping resource="cn/icss/a_helloworld/User.hbm.xml" />
   </session-factory>
</hibernate-configuration>

=================================

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="cn.icss.a_helloworld">
   <class name="User" table="t_user">
       <id name="id" type="int" column="id">
            <generator class="native"/>
       </id>
       <property name="name" type="string" column="name" />
   </class>
</hibernate-mapping>