DemoMapper.xml

<?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">
<mapper namespace="com.hanyun.hip.mrqc.demo.mapper.DemoMapper">

    <resultMap id="DemoResult" type="com.hanyun.hip.mrqc.demo.domain.SysUserDemo">
        <result property="userName" column="user_name"/>
        <result property="userLogin" column="login_name"/>
    </resultMap>

    <!-- 按评分统计各医院符合条件的病历数 -->
    <select id="selecUserDemo" resultMap="DemoResult">
        SELECT user_name, login_name FROM sys_user WHERE user_id = #{userId}
    </select>
</mapper>