程序进行两个操作，一是将card1表中某记录的amount字段的值减去100，二是将card2表中某记录的amount字段的值增加100，必须保证这两个操作要么都成功，要么都失败。-Program two operations, one will card1 a record amount in the table field value minus 100, the second is the card2 a record amount in the table field value increased by 100, must ensure that either of these two operations are successful, either have failed.