建立測試表

查看版本信息

select version();
5.7.22

創(chuàng)建父表

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

創(chuàng)建子表

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

測試用例-無父表相應(yīng)數(shù)據(jù)，先插入子表

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

結(jié)果：執(zhí)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(shù)據(jù)，再插入子表數(shù)據(jù)

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

結(jié)果：執(zhí)行成功

select * from Models;
1    a

select * from Orders;
1    1    a

測試用例-父子表都有數(shù)據(jù)，刪除子表數(shù)據(jù)

delete from Orders where id = 1;

結(jié)果：執(zhí)行成功

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

測試用例-父子表都有數(shù)據(jù)，刪除父表書庫

delete from Models where ModelID = 1;

結(jié)果：執(zhí)行成功

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

測試用例-父子表都有數(shù)據(jù)，更新子表外鍵

update Orders set ModelID = 3 where ID =1;

結(jié)果：執(zhí)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

測試用例-父子表都有數(shù)據(jù)，更新父表主鍵

update Models set ModelID = 2 where ModelID =1;

結(jié)果：執(zhí)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

測試用例-父子表都有數(shù)據(jù)，更新子表非外鍵

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

結(jié)果：執(zhí)行成功

select * from Orders;
1    1    b

測試用例-父子表都有數(shù)據(jù)，更新父表非主鍵

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

結(jié)果：執(zhí)行成功

select * from Models;
1    c

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