执行的sql语句:SELECT id,nav,title,posttime,clicks,is_bold,is_forward,forwardurl,title_color FROM web_article  where nav=15 and is_online=1 and city in()   order by sort desc, id desc  limit 0,8<br/>错误提示:SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')   order by sort desc, id desc  limit 0,8' at line 1