A Database Error Occurred

Error Number: 1064

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 showinknow=1 limit 1' at line 1

select a.menu,a.id,a.menu_grade,menu_superior from chengcaibarcom.ice_jyt_class a where a.id= and showinknow=1 limit 1