mybatis快速入门，mybatis简单实例， 如何使用mybatis

create database mybatis;
use mybatis;
CREATE TABLE users(id INT PRIMARY KEY AUTO_INCREMENT, NAME VARCHAR(20), age INT);
INSERT INTO users(NAME, age) VALUES('Tom', 12);
INSERT INTO users(NAME, age) VALUES('Jack', 11);

package com.loger.bean;

public class User {
private int id;
private String name;
private int age;
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;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
}
public User(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public User() {
// TODO Auto-generated constructor stub
}
}

<?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/mybatis" />
<property name="username" value="root" />
<property name="password" value="apple" />
</dataSource>
</environment>
</environments>
<!-- 注册 mapper -->
<mappers>
<mapper resource="mapper.xml"/>
</mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- namespace 是这个 mapper 的一个名称 -->
<mapper namespace="userMapper">
<!-- 这是一个简单的查询操作， 操作的 id 是 getUser, parameterType 是查询所根据的参数 -->
<select id="getUser" parameterType="int"
resultType="com.loger.bean.User">
select * from users where id=#{id}
</select>
</mapper>

package com.loger.test;

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;

import com.loger.bean.User;

public class Main {
public static void main(String[] args) throws IOException {

//加载配置文件
Reader reader = Resources.getResourceAsReader("mybatis-conf.xml");

//构建 sqlSession 的工厂
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);

//使用该工厂
SqlSession session = sessionFactory.openSession();

//查询
String statement = "userMapper.getUser";
int id = 1;
User user = session.selectOne(statement, id);
System.out.println(user.toString());
}
}