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

測試案例-無父表相應資料，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

測試案例-先插入主表資料，再插入子表資料

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    aselect * from Orders;1    1    a

測試案例-父子表都有資料，刪除子表資料

delete from Orders where id = 1;

結果：執行成功

select * from Models;1    aselect * from Orders;為空白

測試案例-父子表都有資料，刪除父表書庫

delete from Models where ModelID = 1;

結果：執行成功

select * from Models;為空白select * from Orders;為空白

測試案例-父子表都有資料，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, 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

測試案例-父子表都有資料，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 (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-父子表都有資料，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-父子表都有資料，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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