MySQL Query Error select id,title,subtitle,class from dx_kskm_news where class='参考书' and ejxk_id in ('100354','100357','100358','100323','100353','100326','100355','100356','100301','100302','100300','100350','100351','100352','100325','100327','100329','100359') order by kskm desc limit -2100,50 Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in D:\wwwroot\dddjyky\wwwroot\lanmu2.php on line 330