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