mybatis 第一天环境的搭建(一)

因上一章中写的列子不是很规范，接下来将介绍实现该功能的第二种形式，我这边尽量用代码来表达我的意思，理论有不清楚的可以参考官网文档：

http://mybatis.github.io/mybatis-3/zh/getting-started.html

 

namespace="X",x是这个类的实际地址

 

以下开拔各个文件代码：

1.  configuration.xml

 

<?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>
    <typeAliases>
        <typeAlias alias="User" type="com.bugyun.mybatis.model.User"/>
    </typeAliases>

    <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://127.0.0.1:3306/test" />
            <property name="username" value="root"/>
            <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    
    <mappers>
        <mapper resource="com/bugyun/mybatis/model/UserMapper.xml"/>
    </mappers>
</configuration>

 

 

2.   UserMapper.xml

 

<!-- 如果用第二种方式 namespace=“X” X=X。java类的地址 -->
<mapper namespace="com.bugyun.mybatis.model.UserMapper">
    <select id="selectUserInfo" parameterType="int" resultType="User">
        select * from user where id = #{id}
    </select>
</mapper>

 

 

3.  UserMapper.java ( 这里面的方法 名要和 UserMapper.xml 里的 id 名称一一对应)

package com.bugyun.mybatis.model;

public interface UserMapper {
	
	public User selectUserInfo(int i);
}

 

4.  Test.java

package com.bugyun.test;

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;

import com.bugyun.mybatis.model.User;
import com.bugyun.mybatis.model.UserMapper;

public class Test {

	private static SqlSessionFactory sqlSessionFactory;
	private static Reader reader;

	static {
		try {
			reader = Resources.getResourceAsReader("configuration.xml");
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static SqlSessionFactory getSession() {
		return sqlSessionFactory;
	}

	public static void main(String[] args) {
		SqlSession session = sqlSessionFactory.openSession();
		try {
			UserMapper userMapper = session.getMapper(UserMapper.class);
			User user = userMapper.selectUserInfo(1);
			System.out.println(user.getUserAddress());
			System.out.println(user.getUserName());
		} finally {
			session.close();
		}
	}

 

详情见附件，有不清楚的请留言，谢谢！