MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('081100','081103','081101','081102','081104','081105','081152','081154','081169','081177','081176','081158','081153','081175','081174','081151','081171','081168','081164','081167','081173','081172','081170','081162','081156','081150','081178','081179','081183','081180','0811J3','081185','081182','081184','081188','081181','0811J1','081187','81100','0811J2','0811J4','0811J5') order by kskm desc limit -1100,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330