执行的sql语句:SELECT id,nav,title,posttime,clicks,is_bold,is_forward,forwardurl,title_color FROM web_article  where nav in(43)  order by sort desc, id desc  limit -30,30<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 '-30,30' at line 1