matrix-spray-v2/src/main/resources/mapper/system/UserMapper.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.qyft.ms.system.mapper.UserMapper">


    <select id="findByUsername" resultType="com.qyft.ms.system.model.entity.User">
        SELECT *
        FROM sys_user
        WHERE username = #{username}
    </select>
</mapper>