Mybatis中的resultType与resultMap

<!--查询作者-->
<select id="selectAuthor" resultMap="authorResult">
SELECT
id,
username,
nickname,
birthday,
register_time
FROM
author
WHERE
id = #{id}
</select>
<!--作者结果映射-->
<resultMap id="authorResult" type="Author">
<id property="id" column="id"/>
<result property="registerTime" column="register_time"/>
</resultMap>