安全警告：MySql Error！

错误文件：/service/
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 'AND datavalue<500 ORDER BY orderid ASC, datavalue ASC' at line 1 Error sql: SELECT * FROM `pmw_cascadedata` WHERE `datagroup`='area' AND level=1 AND datavalue> AND datavalue<500 ORDER BY orderid ASC, datavalue ASC