我的php用户登入页面出现这些代码，谁知道是什么意思呀

xiejiede

Query error: SELECT * FROM hs_usersites WHERE (f_userId=) ORDER BY f_order ASC, f_id ASC LIMIT 0, 20You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY f_order ASC, f_id ASC LIMIT 0, 20' at line 1


我的php用户登入页面出现这些代码，谁知道是什么意思呀