PHPMyWind安全警告：MySql Error！

错误文件：/contact.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 'AND checkinfo=true ORDER BY orderid ASC' at line 1 Error sql: SELECT * FROM `ak_infoclass` WHERE parentid= AND checkinfo=true ORDER BY orderid ASC