mysqldump 不保持 ON UPDATE RESTRICT

Question

I have the following create-table-query:

`CREATE TABLE `order_meta` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `order_id` int(11) DEFAULT NULL,
  `meta_key` varchar(255) DEFAULT NULL,
  `meta_value` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `order_meta_key_index` (`order_id`,`meta_key`),
  CONSTRAINT `order_meta_order_id` FOREIGN KEY (`order_id`) REFERENCES `orders` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT
) ENGINE=InnoDB AUTO_INCREMENT=34064 DEFAULT CHARSET=utf8;`

when i run an export / mysqldump, it gives me. running SHOW CREATE TABLE order_meta gives me the same, so i guess thats where the problem lies.

`CREATE TABLE `order_meta` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `order_id` int(11) DEFAULT NULL,
  `meta_key` varchar(255) DEFAULT NULL,
  `meta_value` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `order_meta_key_index` (`order_id`,`meta_key`),
  CONSTRAINT `order_meta_order_id` FOREIGN KEY (`order_id`) REFERENCES `orders` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=34064 DEFAULT CHARSET=utf8;`

notice the 'ON UPDATE RESTRICT' that has been removed. After when i delete a row from 'orders' the rows in 'order_meta' are not removed. When i remove the foreign key and re-add with the on update, it works again. Is this expected behavior or am i missing something here?

`alter table order_meta drop FOREIGN KEY `order_meta_order_id`;`

`alter table order_meta add CONSTRAINT `order_meta_order_id` FOREIGN KEY (`order_id`) REFERENCES `orders` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT;`

Answer 1

我想这与创建 mysqldump 的过时工作台有关。