<?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.lantu.sys.mapper.UserMapper">
    <select id="getRoleNameByUserId" parameterType="Integer" resultType="String">
        SELECT
            b.role_name
        FROM x_user_role a, x_role b
        WHERE
            a.role_id = b.role_id
          AND a.user_id = #{userId}
    </select>

</mapper>
