select (vid_id, vid_name, vid_leadrole, vid_desc, vid_info, vinfo.cid, vid_serialstate)
from tb_videoinfo vinfo where vinfo.cid in (select cid from tb_category where pid=#{cid})
会报 Operand should contain 1 column(s) 错误： Operand should contain 1 column(s)
搜索一下，去掉红色的括号就Ok了，
select vid_id, vid_name, vid_leadrole, vid_desc, vid_info, vinfo.cid, vid_serialstate
from tb_videoinfo vinfo where vinfo.cid in (select cid from tb_category where pid=#{cid})
时间紧任务重，暂时没有事件去找根本原因了，先记录一下。
