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Hibernate入门程序

       以下程序是Hiberante入门程序:代码如下:首先说hibernate开发流程.A、准备一个POJO类  B、创建类的映射和配置文件(hibernate.cfg.xml  class.hbm.xml)class.hbm.xml此配置文件是必须与POJO类中的属性一一对应.
现在我以我创建的程序为例来进行说明:数据库为demo,表的名字为admin
1、POJO类

package com.wch.pojo;

public class Admin {
 private int id;
 private String username;
 private String password;
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
}

class.hbm.xml映射文件存放位置必须于POJO位置一致.也就是说必须放在同一个目录.hibernate.cfg.xml放在src根目录下.
2、创建hibernate.cfg.xml和class.hbm.xml(class指的是POJO类的名字)
class.hbm.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.wch.pojo.Admin" table="admin">
        <id name="id" type="integer">
            <column name="id" />
            <generator class="assigned"></generator>
        </id>
        <property name="username" type="string">
            <column name="username" length="32" not-null="false" />
        </property>
        <property name="password" type="string">
            <column name="password" length="20" not-null="false" />
        </property>
    </class>
</hibernate-mapping>
hibernate.cfg.xml:

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
 <property name="dialect">
  org.hibernate.dialect.MySQLDialect
 </property>
 <property name="connection.url">
  jdbc:mysql://localhost:3306/demo
 </property>
 <property name="connection.username">root</property>
 <property name="connection.password">****</property>
 <property name="connection.driver_class">
  com.mysql.jdbc.Driver
 </property>
 <property name="myeclipse.connection.profile">mysql5.0</property>
 <property name="show_sql">true</property>
 <mapping resource="com/wch/pojo/Admin.hbm.xml" />

</session-factory>

</hibernate-configuration>


3、创建应用程序并进行代码测试:

package com.wch.op;

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

import com.wch.pojo.Admin;

public class UserOperation {
 public static void main(String[] args)throws Exception{
  Configuration config = new Configuration().configure();
  // 创建工厂
  SessionFactory factory = config.buildSessionFactory();
  // 打开session
  Session session = factory.openSession();
  // 事务提交
  try{
   Transaction tx = session.beginTransaction();
   // 创建对象
   Admin hb = new Admin();
   hb.setId(3);
   hb.setUsername("Hibernate3.2");
   hb.setPassword("20081202");
   //hb.setUsername("WCH");
   //hb.setPassword("Hibernate");
   // 执行插入语句,在hibernat中操作的是一个对象
   session.save(hb);
   // 提交事务
   tx.commit();
  }catch(Exception e)
  {
   System.out.println("error Msg:"+e.getMessage());
  }finally{
    // close session
    session.close();
  }
 }
}

更为详细的解释请参照Hibernate官方网站:www.hibernate.org


posted on 2008-12-02 10:19 sunny spring 阅读(270) 评论(0)  编辑  收藏 所属分类: FrameWork


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