<?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/mobile"/>
        <property name="username" value="zhou"/>
        <property name="password" value="123456"/>
      </dataSource>
    </environment>
  </environments>
  <mappers>
    <mapper resource="com/entity/UserMapper.xml"/>
  </mappers></configuration>

<!-- 配置文件的根元素 -->  <configuration>  
    <!-- 属性：定义配置外在化 -->  
    <properties></properties>  
    <!-- 设置：定义mybatis的一些全局性设置 -->  
    <settings>  
       <!-- 具体的参数名和参数值 -->  
       <setting name="" value=""/>   
    </settings>  
    <!-- 类型名称：为一些类定义别名 -->  
    <typeAliases></typeAliases>  
    <!-- 类型处理器：定义Java类型与数据库中的数据类型之间的转换关系 -->  
    <typeHandlers></typeHandlers>  
    <!-- 对象工厂 -->  
    <objectFactory type=""></objectFactory>  
    <!-- 插件：mybatis的插件,插件可以修改mybatis的内部运行规则 -->  
    <plugins>  
       <plugin interceptor=""></plugin>  
    </plugins>  
    <!-- 环境：配置mybatis的环境 -->  
    <environments default="">  
       <!-- 环境变量：可以配置多个环境变量，比如使用多数据源时，就需要配置多个环境变量 -->  
       <environment id="">  
          <!-- 事务管理器 -->  
          <transactionManager type=""></transactionManager>  
          <!-- 数据源 -->  
          <dataSource type=""></dataSource>  
       </environment>   
    </environments>  
    <!-- 数据库厂商标识 -->  
    <databaseIdProvider type=""></databaseIdProvider>  
    <!-- 映射器：指定映射文件或者映射类 -->  
    <mappers></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可以不加xml后缀 --><mapper namespace="com.entity.UserMapper"><!-- 单个对象查询 -->
  <select id="selectUser" parameterType="int"  resultType="com.entity.User">
    select * from user where id = #{id}  </select>
  <!--查询列表  -->
  <resultMap id="userList" type="com.entity.User">
  <result property="id" column="id" />
  <result property="username" column="username"/>
  <result property="password" column="password"/></resultMap>
  <select id="selectAll"  resultMap="userList">
    select * from user  </select>
  <!--插入数据  -->
   <insert id="insert"  >
    insert into User (username,password) values(#{username},#{password})  </insert>
  <!--更新数据  --><update id="update">
  update User set username = #{username},password = #{password} where id = #{id}</update><!--删除数据  --><delete id="delete">
  delete from User where id = #{id}</delete></mapper>

package com.test;import java.io.IOException;import java.io.InputStream;import java.util.List;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.entity.User;/**
 * 
 * @author 坚持到你GL
 * */public class Test {    
     private static SqlSession session=null;    
     public static SqlSession mySession() {        //你的MyBatis的配置文件地址
        String resource = "mybatis-config.xml";
        InputStream inputStream=null;        
        try {            //IO解析xml文件
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {            // TODO Auto-generated catch block            
        e.printStackTrace();
        }        //创建一个SqlSessionFactoryBuilder对象，获得SqlSessionFactory 的实例
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);        //开启SqlSession
         session=sqlSessionFactory.openSession();        
         return session;
    }    private static void select(){        //selectUser是实体类映射文件的中设置的id
        User user=mySession().selectOne("selectUser",2);
        System.out.println(user);
    }    private static void selectAll() {
        List<User> list=mySession().selectList("selectAll");        
        for (User user : list) {
            System.out.println(user);
        }
    }    private static void insert() {
        User insertuser=new User("zhou","123456");
        mySession().insert("insert",insertuser);
        session.commit();
    }    private static void update() {
        User updateuser =new User(9,"admin","admin");
        mySession().update("update", updateuser);
        session.commit();
    }    private static void delect() {
        mySession().delete("delete", 10);
        session.commit();
    }    public static void main(String[] args) {
    
    selectAll();
    }
}