SQL语句错误： SELECT class_name FROM cms_class WHERE id=
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 '' at line 1

SQL语句错误： SELECT * FROM cms_class WHERE pid=
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 '' at line 1