Mysq中l建立测试父表、子表及测试用例归纳总结

select version();
5.7.22

drop table if exists Models;
CREATE TABLE Models
 (
 ModelID SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,
 Name VARCHAR(40) NOT NULL,
 PRIMARY KEY (ModelID)
);

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
 );

insert into Orders(Id,ModelID,Description) values (1,1,'a');

insert into Models(ModelID,Name) values (1,'a');
insert into Orders(Id,ModelID,Description) values (1,1,'a');

select * from Models;
1 a

select * from Orders;
1 1 a

delete from Orders where id = 1;

select * from Models;
1 a
select * from Orders;
为空

delete from Models where ModelID = 1;

select * from Models;
为空
select * from Orders;
为空

update Orders set ModelID = 3 where ID =1;

update Models set ModelID = 2 where ModelID =1;

update Orders set Description = 'b' where ID =1;

select * from Orders;
1 1 b

update Models set Name = 'c' where ModelID =1;

select * from Models;
1 c