Question

我有一个名为ps_cart_product的表，结构如下：

>desc ps_cart_product;
+----------------------+------------------+------+-----+---------+-------+
| Field                | Type             | Null | Key | Default | Extra |
+----------------------+------------------+------+-----+---------+-------+
| id_cart              | int(10) unsigned | NO   | MUL | NULL    |       |
| id_product           | int(10) unsigned | NO   |     | NULL    |       |
| id_address_delivery  | int(10) unsigned | YES  |     | 0       |       |
| id_shop              | int(10) unsigned | NO   |     | 1       |       |
| id_product_attribute | int(10) unsigned | YES  | MUL | NULL    |       |
| quantity             | int(10) unsigned | NO   |     | 0       |       |
| date_add             | datetime         | NO   |     | NULL    |       |
+----------------------+------------------+------+-----+---------+-------+

此表有几行。我想用id_cart=625 AND id_product=63更新第二行。如果我查询：

> select * from ps_cart_product where id_cart=625 and id_product=63;
+---------+------------+---------------------+---------+----------------------+----------+---------------------+
| id_cart | id_product | id_address_delivery | id_shop | id_product_attribute | quantity | date_add            |
+---------+------------+---------------------+---------+----------------------+----------+---------------------+
|     625 |         63 |                   0 |       1 |                  279 |        2 | 2015-05-18 10:29:23 |
|     625 |         63 |                   0 |       1 |                  275 |        1 | 2015-05-18 10:28:55 |
+---------+------------+---------------------+---------+----------------------+----------+---------------------+
2 rows in set (0.01 sec)

我想执行一个SQL UPDATE语句，如：

UPDATE ps_cart_product
   SET id_product_attribute = 280
 WHERE id_cart = 625
   AND id_product = 63
   AND XXXXXXXX

我不知道在XXXXXXXX写什么来只更新第二行。我无法使用id_product_attribute，quantity或date_add的语句来过滤UPDATE语句，因为我无法控制其价值。

Answer 1

如果您可以引入自动增量id字段，那么我希望这可以解决您的问题。

更新MySQL中的第二行

1 个答案: