DAO+Factory+Hibernate的学习。。

看了很多的书了，想着实践一下，就参考了书上的例子写了一点，呵呵刚入门很简单的东西，只有后台写的测试类而已，还望各位指教。

我的开发环境 Eclipse3.3+Myeclipse6.0，因为Myeclipse集成了Hibernate,而且6.0最高的版本是Hibernate3.1..

数据库是MySql5.0

1.首先建库： 

 `login`.CREATE DATABASE `login` /*!40100 DEFAULT CHARACTER SET utf8*/;

 DROP TABLE IF EXISTS `login`.`person`;
CREATE TABLE  `login`.`person` (
  `id` varchar(20) character set utf8NOT NULL default '',
  `name` varchar(45) character set utf8NOT NULL default '',
  `password` varchar(45) character set utf8NOT NULL default '',
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

插入两条测试数据。

2.打开Myeclipse6.0，添加下载的MySql的驱动，建立数据库的一个连接。

3.新建WEB工程，为工程加入Hibernate支持，注意不建立SessionFactory我们可以自己建立一个,

配置文件如下：

java 代码

<?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="connection.username">root</property>
    <property name="connection.url">
        jdbc:mysql://localhost:3306/login
    </property>
    <property name="dialect">
        org.hibernate.dialect.MySQLDialect
    </property>
    <property name="myeclipse.connection.profile">jnetstore</property>
    <property name="connection.password">sa</property>
    <property name="connection.driver_class">
        com.mysql.jdbc.Driver
    </property>
    <property name="show_sql">true</property>
    <mapping resource="cn/will/vo/Person.hbm.xml" />

</session-factory>

</hibernate-configuration>

然后新建POJO类Person.java

代码如下：

java 代码

package cn.will.vo;

public class Person {
    private String id;
    private String name;
    private String password;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

}

3.新建DAO接口类PersonOperate.java

java 代码

package cn.will.dao;

import java.util.List;

import cn.will.vo.Person;

public interface PersonOperate {
    public void insert(Person p) throws Exception;
    public void update(Person p) throws Exception;
    public Person queryById(String id) throws Exception;
    public void delete(Person p) throws Exception;
    public void delete(String id) throws Exception;
    public List queryAll()throws Exception;
    public List queryByLike(String cond)throws Exception;


}

4.建立工厂类，这里使用了两个工厂，一个是Session工厂SessionFactory.java，一个是操作的工厂DAOFactory.java

java 代码

package cn.will.factory;

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

public class SessionFactory {
    public static Session getSession(){
        Session session=null;
        session =new Configuration().configure().buildSessionFactory().openSession();
        return session;
    }

}

java 代码

package cn.will.factory;

import cn.will.dao.PersonOperate;
import cn.will.impl.PersonOperateImpl;

public class DAOFactory {
    public static PersonOperate getOperate(){
        return new  PersonOperateImpl();
    }

}

5.DAO的实现类PersonOperateImpl.java

 

java 代码

package cn.will.impl;

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

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import cn.will.dao.PersonOperate;
import cn.will.factory.SessionFactory;
import cn.will.vo.Person;

public class PersonOperateImpl implements PersonOperate {
    private Session session=null;

    public PersonOperateImpl() {
        this.session = SessionFactory.getSession();
    }

    public void delete(Person p) throws Exception {
        Transaction tran = this.session.beginTransaction() ;
        // 执行语句
        this.session.delete(p) ;
        // 提交事务
        tran.commit() ;
    }

    public void delete(String id) throws Exception {
        String hql = "DELETE Person WHERE id=?" ;
        Query q = this.session.createQuery(hql) ;
        // 把参数设置
        q.setString(0,id) ;
        // 执行更新语句
        q.executeUpdate() ;
        // 进行事务处理
        this.session.beginTransaction().commit() ;
    }

    public void insert(Person p) throws Exception {
        // 开始事务
        Transaction tran = this.session.beginTransaction() ;
        // 执行语句
        this.session.save(p) ;
        // 提交事务
        tran.commit() ;
        // 关闭Session
        this.session.close() ;
    }

    public List queryAll() throws Exception {
        List l = null ;
        String hql = "FROM Person as p" ;
        Query q = this.session.createQuery(hql) ;
        l = q.list() ;
        return l ;
    }

    public Person queryById(String id) throws Exception {
        Person p = null ;
        // 使用Hibernate查询语言
        String hql = "FROM Person as p WHERE p.id=?" ;
        // 通过Query接口查询
        Query q = this.session.createQuery(hql) ;
        q.setString(0,id) ;
        List l = q.list() ;
        Iterator iter = l.iterator() ;
        if(iter.hasNext())
        {
            p = (Person)iter.next() ;
        }
        return p ;
    }

    public List queryByLike(String cond) throws Exception {
        List l = null ;
        String hql = "FROM Person as p WHERE p.name like ?" ;
        Query q = this.session.createQuery(hql) ;
        q.setString(0,"%"+cond+"%") ;
        l = q.list() ;
        return l ;
    }

    public void update(Person p) throws Exception {
        // 开始事务
        Transaction tran = this.session.beginTransaction() ;
        // 执行语句
        this.session.update(p) ;
        // 提交事务
        tran.commit() ;
    }

}

6.打开DB　Browser窗口，找到第二步建立的数据库连接，找到login数据库,找到person表,右键选择Hibernate Reverse Engineering,在Hibernate Mapping file(*.hbm.xml) for each database table前打勾,在java package选择存放路径,这里选择cn.will.vo,下一步,ID generater选择assigned,下一步,完成.得到person.hbm.xml的代码如下：

java 代码

<?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="cn.will.vo.Person" table="person" catalog="login">
        <id name="id" type="java.lang.String">
            <column name="id" length="20" />
            <generator class="assigned" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="name" length="45" not-null="true" />
        </property>
        <property name="password" type="java.lang.String">
            <column name="password" length="45" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

7.加入测试类TestPersonOperate.java,代码如下:

java 代码

package cn.will.test;

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

import cn.will.factory.DAOFactory;
import cn.will.vo.Person;

public class TestPersonOperate {

    /**
     * @param args
     */
    public static void main(String[] args)throws Exception {
        // TODO Auto-generated method stub
        /*按ID查询
        Person p = new Person() ;
        p=DAOFactory.getOperate().queryById("will");
        System.out.println(p.getName()) ;
        */
        /*插入数据
        Person p=new Person();
        p.setId("aaa");
        p.setName("aaa");
        p.setPassword("aaa");
        DAOFactory.getOperate().insert(p);
        */
        /*查询所有
        Person p=new Person();
        List list=null;
        list=DAOFactory.getOperate().queryAll();
        Iterator iter=list.iterator();
        if(iter.hasNext())
        {
            p=(Person)iter.next();
            System.out.println(p.getName());
        }
        */
        /*模糊查询
        Person p=new Person();
        List list=null;
        list=DAOFactory.getOperate().queryByLike("wi");
        Iterator iter=list.iterator();
        if(iter.hasNext())
        {
            p=(Person)iter.next();
            System.out.println(p.getName());
        }
        */
    }

}

8.运行..进行如下查询时可以正确执行得到预期结果.

总结:本人因为是初学所以难免又不对的地方,这是我按照自己的理解写的,希望和大家共同学习,希望..