Mysq中l建立測試父表、子表及測試案例歸納總結

建立測試表

查看版本資訊

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
  );

測試

##測試使用案例-無父表相應數據，先插入子表

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

結果：執行失敗

異常：[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)原因：通不過on delete cascade 的外鍵約束檢查

測試用例-先插入主表數據，再插入子表數據

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

結果：執行成功

select * from Models;
1    a

select * from Orders;
1    1    a

測試案例-父子表都有數據，刪除子表數據

delete from Orders where id = 1;

結果：執行成功

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

測試案例-父子表都有數據，刪除父表書庫

delete from Models where ModelID = 1;

結果：執行成功

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

測試案例-父子表都有數據，更新子表外鍵

update Orders set ModelID = 3 where ID =1;

結果：執行失敗

異常：[2018-07-31 12:33:02] 23000 Cannot add or update a child row: a foreign key constraint fails (
bov.Orders, CONSTRAINTINT Orders_ibfk_1 FOREIGN KEY (ModelID) REFERENCES Models (ModelID) ON DELETE CASCADE) 原因：通不過on delete cascade 的外鍵約束檢查

測試案例-父子表都有數據，更新父表主鍵

update Models set ModelID = 2 where ModelID =1;

結果：執行失敗

異常：[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 (##ModeModelID#Mode ) REFERENCES Models (ModelID) ON DELETE CASCADE)原因：通不過on delete cascade 的外鍵約束檢查
測試案例-父子表都有數據，更新子表非外鍵

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

結果：執行成功

select * from Orders;
1    1    b

測試案例-父子表都有數據，更新父表非主鍵

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

結果：執行成功

select * from Models;
1    c

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