MySQL 无法添加或更新子行 - 外键约束失败

Question

我看过无数关于相同错误的帖子，通常使用相同的解决方案，但对我来说并非如此！

我正在使用 Magento，在保存客户地址时遇到外键错误。错误如下：

SQLSTATE[23000]：完整性约束违规：1452 无法添加或更新子行：外键约束失败（carltonpackaging.customer_address_entity，CONSTRAINT FK_CUSTOMER_ADDRESS_ENTITY_PARENT_ID_CUSTOMER_ENTITY_ENTITY_ID FOREIGN KEY（parent_id）参考customer_entity (entity_id) O)

我试图在customer_address_entity 中更新的数据包括parent_id 的值3。 customer_entity 表中有一条记录，entity_id 为 3。

两个表都在使用 InnoDB，customer_entity.entity_id 和 customer_address_entity.parent_id 都是 INT(11)。

这也不是自定义功能，这是 Magento 的核心功能——我不知道为什么！

编辑：表定义：

CREATE TABLE `customer_address_entity` (
  `entity_id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Entity Id',
  `entity_type_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Entity Type Id',
  `attribute_set_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Attribute Set Id',
  `increment_id` varchar(50) DEFAULT NULL COMMENT 'Increment Id',
  `parent_id` int(10) unsigned DEFAULT NULL COMMENT 'Parent Id',
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT 'Created At',
  `updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Updated At',
  `is_active` smallint(5) unsigned NOT NULL DEFAULT '1' COMMENT 'Is Active',
  PRIMARY KEY (`entity_id`),
  KEY `IDX_CUSTOMER_ADDRESS_ENTITY_PARENT_ID` (`parent_id`),
  CONSTRAINT `FK_CUSTOMER_ADDRESS_ENTITY_PARENT_ID_CUSTOMER_ENTITY_ENTITY_ID` FOREIGN KEY (`parent_id`) REFERENCES `customer_entity` (`entity_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=874 DEFAULT CHARSET=utf8 COMMENT='Customer Address Entity'

CREATE TABLE `customer_entity` (
  `entity_id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Entity Id',
  `entity_type_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Entity Type Id',
  `attribute_set_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Attribute Set Id',
  `website_id` smallint(5) unsigned DEFAULT NULL COMMENT 'Website Id',
  `email` varchar(255) DEFAULT NULL COMMENT 'Email',
  `group_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Group Id',
  `increment_id` varchar(50) DEFAULT NULL COMMENT 'Increment Id',
  `store_id` smallint(5) unsigned DEFAULT '0' COMMENT 'Store Id',
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT 'Created At',
  `updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT 'Updated At',
  `is_active` smallint(5) unsigned NOT NULL DEFAULT '1' COMMENT 'Is Active',
  `disable_auto_group_change` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Disable automatic group change based on VAT ID',
  PRIMARY KEY (`entity_id`),
  KEY `IDX_CUSTOMER_ENTITY_STORE_ID` (`store_id`),
  KEY `IDX_CUSTOMER_ENTITY_ENTITY_TYPE_ID` (`entity_type_id`),
  KEY `IDX_CUSTOMER_ENTITY_EMAIL_WEBSITE_ID` (`email`,`website_id`),
  KEY `IDX_CUSTOMER_ENTITY_WEBSITE_ID` (`website_id`),
  CONSTRAINT `FK_CUSTOMER_ENTITY_STORE_ID_CORE_STORE_STORE_ID` FOREIGN KEY (`store_id`) REFERENCES `core_store` (`store_id`) ON DELETE SET NULL ON UPDATE CASCADE,
  CONSTRAINT `FK_CUSTOMER_ENTITY_WEBSITE_ID_CORE_WEBSITE_WEBSITE_ID` FOREIGN KEY (`website_id`) REFERENCES `core_website` (`website_id`) ON DELETE SET NULL ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=875 DEFAULT CHARSET=utf8 COMMENT='Customer Entity'

编辑：尽管发送了 3 的 parent_id，但 MySQL 收到了 0 的 parent_id，导致错误。还没弄明白为什么会这样，等我弄明白了再更新！

Answer 1

首先尝试直接在您的数据库上测试您的查询。大多数情况下，当您尝试调用/写入不存在的外键或尝试删除其他表上仍然存在/需要的外键时，会引发约束错误。