$comments = $model->field('comment.id,order.out_trade_no,users.username,comment.spelevel,comment.desc,comment.qualevel,comment.efflevel')->join('LEFT JOIN users ON comment.commenteruid=users.id')->join('LEFT JOIN order ON comment.oid=order.id')->limit($Page->firstRow.','.$Page->listRows)->where($where)->select();
这行代码哪有问题