MySQL是一個(gè)常用的關(guān)系型數(shù)據(jù)庫管理系統(tǒng)，常常用于開發(fā)商業(yè)應(yīng)用、網(wǎng)站等。在訂單系統(tǒng)中，生成訂單號(hào)是一個(gè)重要的功能。本文將介紹如何使用MySQL生成10位不同的訂單號(hào)。

CREATE TABLE `order` (
`id` int(11) NOT NULL,
`order_number` varchar(10) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

上述代碼創(chuàng)建了一個(gè)名為`order`的表，包含兩個(gè)字段：`id`和`order_number`。

ALTER TABLE `order`
ADD PRIMARY KEY (`id`),
ADD UNIQUE KEY `order_number` (`order_number`);

上述代碼是為`order_number`字段添加唯一索引，確保生成的訂單號(hào)唯一。

DELIMITER $$
CREATE FUNCTION generate_order_number() RETURNS VARCHAR(10)
BEGIN
DECLARE order_num VARCHAR(10) DEFAULT '';
DECLARE counter INT DEFAULT 0;
REPEAT
SET counter = counter + 1;
SET order_num = CONCAT(REPEAT('0', 10 - LENGTH(counter)), counter);
UNTIL (SELECT COUNT(*) FROM `order` WHERE `order_number` = order_num) = 0
END REPEAT;
INSERT INTO `order` (`order_number`) VALUES (order_num);
RETURN order_num;
END $$
DELIMITER ;

上述代碼是創(chuàng)建一個(gè)生成訂單號(hào)的函數(shù)`generate_order_number()`。該函數(shù)會(huì)循環(huán)生成一個(gè)10位數(shù)的訂單號(hào)，并判斷是否已存在，直到生成一個(gè)不存在的訂單號(hào)為止。然后將該訂單號(hào)插入`order`表中，并返回該訂單號(hào)。

INSERT INTO `order` (`order_number`) VALUES
(generate_order_number()),
(generate_order_number()),
(generate_order_number()),
(generate_order_number()),
(generate_order_number()),
(generate_order_number()),
(generate_order_number()),
(generate_order_number()),
(generate_order_number()),
(generate_order_number());

上述代碼是在`order`表中插入10個(gè)訂單號(hào)，每個(gè)訂單號(hào)由`generate_order_number()`函數(shù)生成。

通過以上代碼，我們實(shí)現(xiàn)了一個(gè)可以生成、保存、保證唯一性的10位訂單號(hào)的MySQL函數(shù)。可以在需要生成訂單號(hào)的時(shí)候調(diào)用該函數(shù)即可。