购物车里的两件不同商品一起结算后报的错误：
mysql server error report:array ( [0] => array ( [message] => mysql query error ) [1] => array ( [sql] => select *from `rishengxjd`.`ecs_favourable_activity` where start_time = '1420966015' and concat(',', user_rank, ',') like '%,2,%' and act_type in ('2','1') and supplier_id= ) [2] => array ( [error] => 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 ) [3] => array ( [errno] => 1064 ) )