MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('081700','081701','081704','081702','081758','081703','081705','081751','081753','081778','081779','081775','081754','081774','081760','081786','081757','081785','081781','081752','081764','081763','081767','081768','081766','081770','081772','081780','081776','081783','081782','081784','081762','081765','081759','081761','081771','081773','081777','081750','081787','081789','081749','081799','0817Z2','081756','081788','081794','081790','081791','081798','081795','081796','081747','081748','081797','0817J4','0817J7','0817J1','0817J6','81700','0817J2') order by kskm desc limit -1750,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330