安全警告：MySql Error！

错误文件：/show.php
错误信息：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 '-2,0' at line 1 Error sql: SELECT * FROM `ctc_infoimg` WHERE (classid=34 OR parentstr LIKE '%,34,%') AND delstate='' AND checkinfo=true AND id!=406 order by orderid desc limit -2,0