Question

我的模型上有这些表格：

DROP TABLE IF EXISTS `UNIVERSES`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `UNIVERSES` (
  `country_code` varchar(2) COLLATE utf8_unicode_ci NOT NULL,
  `code` varchar(2) COLLATE utf8_unicode_ci NOT NULL,
  `description` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `image` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `order` tinyint(4) NOT NULL,
  PRIMARY KEY (`country_code`,`code`),
  KEY `identifier` (`code`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
/*!40101 SET character_set_client = @saved_cs_client */;

ALTER TABLE `UNIVERSES`    
  ADD CONSTRAINT `UNIVERSES_ibfk_1` FOREIGN KEY (`country_code`) REFERENCES `COUNTRY` (`id`) ON UPDATE CASCADE;


DROP TABLE IF EXISTS `RULES`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `RULES` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `from_element_code` varchar(45) COLLATE utf8_unicode_ci NOT NULL,
  `appliedto_element_code` varchar(45) COLLATE utf8_unicode_ci NOT NULL,
  `type` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
/*!40101 SET character_set_client = @saved_cs_client */;

ALTER TABLE `RULES`
  ADD CONSTRAINT `RULES_ibfk_1` FOREIGN KEY (`from_element_code`) REFERENCES `ELEMENTS` (`code`) ON UPDATE CASCADE,
  ADD CONSTRAINT `RULES_ibfk_2` FOREIGN KEY (`appliedto_element_code`) REFERENCES `ELEMENTS` (`code`) ON UPDATE CASCADE,
  ADD CONSTRAINT `RULES_ibfk_3` FOREIGN KEY (`type`) REFERENCES `RULES_TYPE` (`id`) ON UPDATE CASCADE;

我需要添加一个带约束的字段。我试试：

--
-- Add new field to RULES table
--

ALTER TABLE `RULES` ADD `univers_code` VARCHAR(2) COLLATE utf8_unicode_ci NOT NULL AFTER `appliedto_element_code`;
ALTER TABLE `RULES` ADD `country_code` VARCHAR(2) COLLATE utf8_unicode_ci NOT NULL AFTER `appliedto_element_code`;

--
-- Create new index for new RULES field
--

ALTER TABLE `RULES`
  ADD CONSTRAINT `RULES_ibfk_4` FOREIGN KEY (`country_code`, `univers_code`) REFERENCES `UNIVERSES` (`country_code`, `code`) ON UPDATE CASCADE;

并且创建了字段，但约束失败并出现以下错误：

#1452 - Cannot add or update a child row: a foreign key constraint fails (`CFS_DEV`.<result 2 when explaining filename '#sql-aac_145'>, CONSTRAINT `RULES_ibfk_4` FOREIGN KEY (`country_code`, `univers_code`) REFERENCES `UNIVERSES` (`country_code`, `code`) ON UPDATE C)

我已经看过类型匹配，并且由于它是双主键，因此该对是唯一的，实际上它是引用表的主键。我不知道自己在逃学。

请帮助我们。

提前致谢。

编辑：mysql引擎输出

------------------------
LATEST FOREIGN KEY ERROR
------------------------
140826 18:55:17 Transaction:
TRANSACTION 25649B, ACTIVE 0 sec, process no 2732, OS thread id 2825907056 inserting
mysql tables in use 2, locked 2
5 lock struct(s), heap size 320, 2 row lock(s), undo log entries 1
MySQL thread id 349, query id 19960 192.168.230.1 mdecfs01 copy to tmp table
ALTER TABLE `RULES`
  ADD CONSTRAINT `RULES_ibfk_4` FOREIGN KEY (`univers_code`) REFERENCES `UNIVERSES` (`code`) ON DELETE CASCADE ON UPDATE CASCADE
Foreign key constraint fails for table `CFS_DEV`.<result 2 when explaining filename '#sql-aac_15d'>:
,
  CONSTRAINT `RULES_ibfk_4` FOREIGN KEY (`univers_code`) REFERENCES `UNIVERSES` (`code`) ON DELETE CASCADE ON UPDATE CASCADE
Trying to add in child table, in index `RULES_ibfk_4` tuple:
DATA TUPLE: 2 fields;
 0: len 0; hex ; asc ;;
 1: len 4; hex 80000023; asc    #;;

But in parent table `CFS_DEV`.`UNIVERSES`, in index `identifier`,
the closest match we can find is record:
PHYSICAL RECORD: n_fields 2; compact format; info bits 0
 0: len 1; hex 41; asc A;;
 1: len 2; hex 6265; asc be;;

Mysql约束创建失败

0 个答案: