/all

var sqlstr=‘SELECT c.count, user.usrname,i.image,r.*  FROM room r LEFT OUTER JOIN (SELECT image,roomid,MIN(id) FROM room_image  GROUP BY roomid) i  ON r.id=i.roomid ‘
    +‘inner join user on r.userid=user.id  ‘
    + ‘LEFT OUTER JOIN (SELECT COUNT(roomid) AS COUNT,roomid FROM room_comment GROUP BY roomid) c ON r.id=c.roomid ‘;

vue種

<i v-if="room.count" style="padding-right: 1em" class="el-icon-news">{{room.count}}</i>

room:id裏

var sqlstr=‘select c.count, user.usrname, r.* from room r inner join user on r.userid=user.id ‘
    +‘LEFT OUTER JOIN (SELECT COUNT(roomid) AS COUNT,roomid FROM room_comment GROUP BY roomid) c ON r.id=c.roomid‘
    +‘ where r.id = ‘+roomid;

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