Question

我有预订表和订单表。每个预订都是订单的一部分，因此将intOrderID存储为外键。我有以下MySQL程序

CREATE PROCEDURE `usp_archive` (
  IN p_dtmBefore DATE
  )
BEGIN
START TRANSACTION;

INSERT INTO tblArchivedOrders SELECT * FROM tblOrders O WHERE (SELECT MAX(dtmDateTime) FROM tblBookings WHERE intOrderID = O.intOrderID) < p_dtmBefore;
INSERT INTO tblArchivedBookings SELECT * FROM tblBookings WHERE intOrderID IN (SELECT intOrderID FROM tblArchivedOrders);

DELETE FROM tblBookings WHERE intOrderID IN (SELECT intOrderID FROM tblArchivedOrders);  
DELETE FROM tblOrders WHERE intOrderID IN (SELECT intOrderID FROM tblArchivedOrders);

COMMIT;
END $$
DELIMITER ;

失败并显示以下消息

Error Code: 1451. Cannot delete or update a parent row: a foreign key constraint fails (`mjlprodu_CGUA_test`.`tblBookings`, CONSTRAINT `tblBookings_ibfk_2` FOREIGN KEY (`intOrderID`) REFERENCES `tblOrders` (`intOrderID`))

我看到这条消息说tblBookings中仍然有一个预订，它引用了我试图删除的tblOrders中的订单，因此我无法删除该订单。但是，如果我运行此查询

SELECT * FROM tblOrders WHERE intOrderID IN (SELECT intOrderID FROM tblArchivedOrders) AND  intOrderID IN (SELECT intOrderID FROM tblBookings)

它不返回任何行。

所以我已经注释掉了“DELETE FROM tblOrders ..”这一行，程序运行正常。然后我自己运行“DELETE FROM tblOrders ..”行，这也运行正常！

这究竟是怎么发生的？

mysql存储过程因FK错误而失败，但相同的行单独运行

0 个答案: