insert ignore into sys_notice_read (notice_id, user_id, read_time) values (#{noticeId}, #{userId}, sysdate()) select count(*) from sys_notice n where n.status = '0' and not exists (select 1 from sys_notice_read r where r.notice_id = n.notice_id and r.user_id = #{userId}) select count(*) from sys_notice_read where notice_id = #{noticeId} and user_id = #{userId} select n.notice_id as noticeId, n.notice_title as noticeTitle, n.notice_type as noticeType, n.status, n.create_by as createBy, n.create_time as createTime, case when r.notice_id is not null then true else false end as isRead from sys_notice n left join sys_notice_read r on r.notice_id = n.notice_id and r.user_id = #{userId} where n.status = '0' order by n.notice_id desc limit #{limit} insert ignore into sys_notice_read (notice_id, user_id, read_time) values (#{noticeId}, #{userId}, sysdate()) delete from sys_notice_read where notice_id in #{noticeId}