php-更新查询MySQL PDO时的环境

怎样行使CASE WHEN在MySQL和PDO中运行更新查询.
以下查询将CASE列更新为0.

$query= "Update payments SET 
                            total = :total,paid = CASE
                                      WHEN paid > :new THEN paid = :new
                                   ELSE paid
                                   END,due = CASE
                                     WHEN paid < :new THEN due = :new - paid
                                  ELSE due
                                  END
                             WHERE id = :id ";

                        $update= $db->prepare($query);

                        $update->bindparam(':total',$new);
                        $update->bindparam(':new',$new);
                        $update->bindparam(':id',$id);
                        $update->execute();

UPDATE payments SET 
 total = :total,paid = (CASE WHEN paid > :new THEN :new ELSE paid END),due = (CASE WHEN paid < :new THEN (:new - paid) ELSE due END)
 WHERE id = :id 

我删除了case语句中对pay和due列的分派.

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