Question

我的表中有三个客户ID，让我们说A，B，C.我想创建订单表来管理这些客户的订单。我想在这样的地方创建orderID列，它必须自动增加，并附加了cunstomer Id。 orderID列记录：

A_1  --->A's 1st order,
A_2  --->A's 2nd order,
B_1  --->B's 1st order,
C_1  --->C's 1st order,
A_3  --->A's 3rd order,
C_2  --->C's 2nd order,
C_3  --->C's 3rd order,
B_2  --->B's 2nd order,
A_4  --->A's 4th order,
A_5  --->A's 5th order

Answer 1

CREATE TABLE IF NOT EXISTS `orders` (
  `order_id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id` BIGINT UNSIGNED NOT NULL,
  `created` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `fk_customer_orders` (`customer_id` ASC)
);

这使您可以轻松INSERT您的订单，而无需考虑生成的标识符。额外的created行将允许您对它们进行排序并为它们提供您想要的数字。

$result = $mysqli->query("SELECT * FROM `orders` WHERE `customer_id` = 1 ORDER BY `created`");

$orders = array();
while ($row = $result->fetch_assoc()) {
    $orders[] = $row;
}

echo count($orders) , PHP_EOL; // 42

foreach ($orders as $delta => $order) {
    echo "Your order #" , ($delta + 1) , " with the unique identifier {$order["order_id"]}." , PHP_EOL;
}

只是一个例子。

Answer 2

您可以使用不带PHP的存储过程生成自定义自动增量值，如下所述：

http://en.latindevelopers.com/ivancp/2012/custom-auto-increment-values/

您将获得以下密钥：

SELECT * FROM custom_autonums;
+----+------------+------------+
| id | seq_1      | seq_2      |
+----+------------+------------+
|  4 | 001-000001 | DBA-000001 |
|  5 | 001-000002 | DBA-000002 |
|  6 | 001-000003 | DBA-000003 |
|  7 | 001-000676 | DBA-000004 |
|  8 | 001-000677 | DBA-000005 |
|  9 | 001-000678 | DBA-000006 |

您可以轻松修改以生成自己的自定义自动数字。

自定义Mysql表中的自动增量

2 个答案: