mybatisSample

首先来一个util类，MybatisUtil：

package org.iteye.bbjava.mybatis.util;

import java.io.IOException;
import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MyBatisUtil {

	private static SqlSessionFactory sqlSessionFactory = null;

	public static SqlSessionFactory buildSessionFacotory(){
		Reader reader = null;
		if (sqlSessionFactory == null) {
			String resource = "org/iteye/bbjava/mybatis/configuration.xml";
			try {
				reader = Resources.getResourceAsReader(resource);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
			return sqlSessionFactory;
		}
		return sqlSessionFactory;
	}

	public static SqlSessionFactory getSqlSessionFactory() {
		return sqlSessionFactory;
	}

}

下面是mybatis的配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://localhost:3306/test" />
				<property name="username" value="root" />
				<property name="password" value="123456" />
			</dataSource>
		</environment>
	</environments>
	<mappers>
		<mapper resource="org/iteye/bbjava/mybatis/UserMapper.xml" />
	</mappers>
</configuration>

UserMapper.java文件:

package org.iteye.bbjava.mybatis;

public class UserMapper {
	private int id;
	private String name;
	private String password;

	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;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}
	

}

UserMapper.java文件对应的mybatis的配置文件：

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE mapper  
PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"  
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<mapper namespace="org.iteye.bbjava.mybatis.UserMapper">
	<select id="selectOne" parameterType="int"
		resultType="org.iteye.bbjava.mybatis.UserMapper">
		select * from user where id = #{id}
	</select>
	<insert id="insertUserMapper" parameterType="org.iteye.bbjava.mybatis.UserMapper">
		insert into user(id,name,password) values(#{id},#{name},#{password})
	</insert>
</mapper>

配置说明：

引用

<mapper namespace="org.iteye.bbjava.mybatis.UserMapper">
</mapper>

namespace是可以自已取，据我了解好像并没有太大的作用，只是要用全名来消除歧义。

一个简单的dao类，UserDao.java文件：

package org.iteye.bbjava.mybatis.dao;

import org.apache.ibatis.session.SqlSession;
import org.iteye.bbjava.mybatis.UserMapper;
import org.iteye.bbjava.mybatis.util.MyBatisUtil;

public class UserDao {
	public UserMapper query(int id) {
		SqlSession session = MyBatisUtil.buildSessionFacotory().openSession();
		UserMapper user = null;
		try {
			user = (UserMapper) session.selectOne(
					"org.iteye.bbjava.mybatis.UserMapper.selectOne", id);
		} catch (Exception e) {
			e.printStackTrace();// TODO: handle exception
		} finally {
			session.close();
		}
		return user;
	}

	public void insert(UserMapper um) {
		SqlSession session = MyBatisUtil.buildSessionFacotory().openSession();
		try {
			session.insert("insertUserMapper", um);
		} finally {
			session.commit();
			session.close();
		}

	}
}

测试类：

package org.iteye.bbjava.mybatis.test;

import org.iteye.bbjava.mybatis.UserMapper;
import org.iteye.bbjava.mybatis.dao.UserDao;

public class UserTest {
	public static void main(String[] args) {
		UserDao ud = new UserDao();
		/*UserMapper user = ud.query(1);
		System.out.println(user.getId());
		System.out.println(user.getName());*/
		UserMapper um =  new UserMapper();
		um.setId(3);
		um.setName("zbc");
		um.setPassword("123456");
		ud.insert(um);
		um = ud.query(1);
		System.out.println(um.getName());
	}
}

在MySQL数据中选择test，创建一张user表，代码如下：

use test;
create table user(
id int not null,
name varchar(255),
password varchar(16)
primary key(id);
);