MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('083201','083203','083202','083204','083259','083265','083200','083256','083278','083262','083260','083261','083254','083268','083253','083255','083251','083270','083272','083271','083252','083277','083276','083263','083269','083275','083273','083274','083280','083281','083282','083002','0832J4','0832J5','83200','0832J2','0832J3','0832J1') order by kskm desc limit -1700,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330