竖立测试表
检察版本信息
select version(); 5.7.22
建立父表
drop table if exists Models; CREATE TABLE Models ( ModelID SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT, Name VARCHAR(40) NOT NULL, PRIMARY KEY (ModelID) );
建立子表
drop table if exists Orders; CREATE TABLE Orders ( ID SMALLINT UNSIGNED NOT NULL PRIMARY KEY, ModelID SMALLINT UNSIGNED NOT NULL, Description VARCHAR(40), FOREIGN KEY (ModelID) REFERENCES Models (ModelID) ON DELETE cascade );
测试
测试用例-无父表响应数据,先插进去子表
insert into Orders(Id,ModelID,Description) values (1,1,'a');
效果:实行失利
非常:[2018-07-31 11:08:01] 23000 Cannot add or update a child row: a foreign key constraint fails (bov
.Orders
, CONSTRAINT Orders_ibfk_1
FOREIGN KEY (ModelID
) REFERENCES Models
(ModelID
) ON DELETE CASCADE)
缘由:通不过on delete cascade 的外键束缚搜检
测试用例-先插进去主表数据,再插进去子表数据
insert into Models(ModelID,Name) values (1,'a'); insert into Orders(Id,ModelID,Description) values (1,1,'a');
效果:实行胜利
select * from Models; 1 a select * from Orders; 1 1 a
测试用例-父子表都有数据,删除子表数据
delete from Orders where id = 1;
效果:实行胜利
select * from Models; 1 a select * from Orders; 为空
测试用例-父子表都有数据,删除父表书库
delete from Models where ModelID = 1;
效果:实行胜利
select * from Models; 为空 select * from Orders; 为空
测试用例-父子表都有数据,更新子表外键
update Orders set ModelID = 3 where ID =1;
效果:实行失利
非常:[2018-07-31 12:33:02] 23000 Cannot add or update a child row: a foreign key constraint fails (bov
.Orders
, CONSTRAINT Orders_ibfk_1
FOREIGN KEY (ModelID
) REFERENCES Models
(ModelID
) ON DELETE CASCADE)
缘由:通不过on delete cascade 的外键束缚搜检
测试用例-父子表都有数据,更新父表主键
update Models set ModelID = 2 where ModelID =1;
效果:实行失利
非常:[2018-07-31 12:34:24] 23000 Cannot delete or update a parent row: a foreign key constraint fails (bov
.Orders
, CONSTRAINT Orders_ibfk_1
FOREIGN KEY (ModelID
) REFERENCES Models
(ModelID
) ON DELETE CASCADE)
缘由:通不过on delete cascade 的外键束缚搜检
测试用例-父子表都有数据,更新子表非外键
update Orders set Description = 'b' where ID =1;
效果:实行胜利
select * from Orders; 1 1 b
测试用例-父子表都有数据,更新父表非主键
update Models set Name = 'c' where ModelID =1;
效果:实行胜利
select * from Models; 1 c
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