我正在尝试更新在另一个表中作为外键引用的字段。
mysql> 更新维护集合约='95096916-OLD' where contract='95096916';
错误 1451 (23000):无法删除或更新父行:外键约束失败 (
systems_doc
.Equipment
, CONSTRAINTEquipment_ibfk_1
FOREIGN KEY (contract
) REFERENCESMaintenance
(contract
) ON UPDATE CASCADE)
| Maintenance | CREATE TABLE `Maintenance` (
`contract` char(30) NOT NULL,
`quote` char(30) NOT NULL,
`vendor` char(20) NOT NULL,
`provider` char(20) NOT NULL,
`product` char(30) NOT NULL,
`expiryDate` date NOT NULL,
`annualCost` int(11) NOT NULL,
`reference` char(13) NOT NULL,
`purchaseOrder` char(13) NOT NULL,
`cq` char(10) NOT NULL,
`cqRenewal` char(10) NOT NULL,
`comments` char(40) NOT NULL,
UNIQUE KEY `contract` (`contract`,`expiryDate`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
| Equipment | CREATE TABLE `Equipment` (
`vendor` char(20) NOT NULL,
`model` char(30) NOT NULL,
`serialNumber` char(20) NOT NULL,
`purchaseOrder` char(20) NOT NULL,
`purchaseDate` date NOT NULL,
`contract` char(15) NOT NULL,
`annualCost` int(11) NOT NULL,
`comments1` varchar(256) DEFAULT NULL,
`comments2` varchar(256) NOT NULL,
PRIMARY KEY (`serialNumber`),
KEY `contract` (`contract`),
CONSTRAINT `Equipment_ibfk_1` FOREIGN KEY (`contract`) REFERENCES `Maintenance` (`contract`) ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
为什么它不级联更新?我不认为它是圆形的。谢谢你的帮助。我读过其他类似的问题,但要么我误解了它应该如何工作,要么我的设置有误。