有两个外键约束引用同一个主键，都使用ON UPDATE CASCADE

Question

我有一些麻烦与MySQL的管理工作室，这是给我的错误

Msg 1785, Level 16, State 0, Line 65 
Introducing FOREIGN KEY constraint 'FK__Likes__LikeeId__5A846E65' on table 'Likes' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. 
Msg 1750, Level 16, State 0, Line 65 
Could not create constraint or index. See previous errors. 

这是关系到喜欢表的代码，配置文件表是我们从中获得外键的地方。问题在于它说我不能同时拥有外键约束，因为它创建了一个循环，但我不明白为什么会这样。

CREATE TABLE Profile (
ProfileId VARCHAR(24), 
OwnerSSN VARCHAR(11) NOT NULL, 
Age INTEGER NOT NULL, 
AgeRangeStart INTEGER NOT NULL, 
AgeRangeEnd INTEGER NOT NULL, 
GeoRange INTEGER NOT NULL, 
Gender VARCHAR(1) NOT NULL, 
Hobbies VARCHAR(50), 
Height DECIMAL(2,1) NOT NULL, 
Weight INTEGER NOT NULL, 
HairColor VARCHAR(20), 
ProfileCreationDate DATETIME NOT NULL, 
ProfileModDate DATETIME NOT NULL, 
Active BIT NOT NULL, 
PRIMARY KEY(ProfileId), 
FOREIGN KEY (OwnerSSN) REFERENCES Customer(SSN), 
CHECK(Age < 120 AND Age >= 17), 
CHECK(AgeRangeStart >= 17 AND AgeRangeEnd >= AgeRangeStart), 
CHECK(GeoRange > 0)); 

CREATE TABLE Likes (
LikerId VARCHAR(24), 
LikeeId VARCHAR(24), 
Date_Time DATETIME , 
PRIMARY KEY (LikeeId, LikerId, Date_Time) , 
FOREIGN KEY(LikerId) REFERENCES Profile(ProfileId) 
ON UPDATE CASCADE, 
FOREIGN KEY(LikeeId) REFERENCES Profile(ProfileId) 
ON UPDATE CASCADE 
); 

Answer 1

这是当你需要开始使用触发器。

CREATE TRIGGER tr_UpdateLikee BEFORE UPDATE 
ON Profile FOR EACH ROW 
UPDATE Likes 
SET likeeId = NEW.ProfileId 
Where LikeeId = Profile.ProfileId 

CREATE TRIGGER tr_UpdateLiker BEFORE UPDATE 
ON Profile FOR EACH ROW 
UPDATE Likes 
SET likerId = NEW.ProfileId 
Where LikerId = Profile.ProfileId