错误SQL语句：
select * from `www_all_item` where `type` = '2' order by `id` DESC limit -20,20
系统错误：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 '-20,20' at line 1
客户IP:220.181.89.174
时间 :2013-06-13 23:50:42