RuoYi-Cloud-Plus/ruoyi-modules/ruoyi-system/src/main/resources/mapper/system/SysPostMapper.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.ruoyi.system.mapper.SysPostMapper">

	<resultMap type="SysPost" id="SysPostResult">
		<id     property="postId"        column="post_id"       />
		<result property="postCode"      column="post_code"     />
		<result property="postName"      column="post_name"     />
		<result property="postSort"      column="post_sort"     />
		<result property="status"        column="status"        />
		<result property="createBy"      column="create_by"     />
		<result property="createTime"    column="create_time"   />
		<result property="updateBy"      column="update_by"     />
		<result property="updateTime"    column="update_time"   />
		<result property="remark"        column="remark"        />
	</resultMap>

	<select id="selectPostListByUserId" parameterType="Long" resultType="Long">
		select p.post_id
        from sys_post p
	        left join sys_user_post up on up.post_id = p.post_id
	        left join sys_user u on u.user_id = up.user_id
	    where u.user_id = #{userId}
	</select>

	<select id="selectPostsByUserName" parameterType="String" resultMap="SysPostResult">
		select p.post_id, p.post_name, p.post_code
		from sys_post p
			 left join sys_user_post up on up.post_id = p.post_id
			 left join sys_user u on u.user_id = up.user_id
		where u.user_name = #{userName}
	</select>

</mapper>