SQL语句执行失败<br>错误的SQL语句是： select * from `products` where 1  and `nav`='46' LIMIT -12,12<br>错误编号：42000<br>错误行数：91<br>错误文件：/data/user/htdocs/Framework/Core/MyPDO.class.php<br>错误信息：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 '-12,12' at line 1<br>