共计 2045 个字符，预计需要花费 6 分钟才能阅读完成。
自动写代码机器人，免费开通
这篇文章给大家分享的是有关 Mysq 中 l 建立测试父表、子表及测试用例的示例的内容。丸趣 TV 小编觉得挺实用的，因此分享给大家做个参考，一起跟随丸趣 TV 小编过来看看吧。
建立测试表查看版本信息
select version();
5.7.22创建父表
drop table if exists Models;
CREATE TABLE Models
(
ModelID SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,
Name VARCHAR(40) NOT NULL,
PRIMARY KEY (ModelID)
);创建子表
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
);测试测试用例 - 无父表相应数据，先插入子表
insert into Orders(Id,ModelID,Description) values (1,1, a结果：执行失败
异常：[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：通不过 on delete cascade 的外键约束检查
测试用例 - 先插入主表数据，再插入子表数据
insert into Models(ModelID,Name) values (1, a
insert into Orders(Id,ModelID,Description) values (1,1, a
结果：执行成功
select * from Models;
1 a
select * from Orders;
1 1 a测试用例 - 父子表都有数据，删除子表数据
delete from Orders where id = 1;结果：执行成功
select * from Models;
1 a
select * from Orders;
为空测试用例 - 父子表都有数据，删除父表书库
delete from Models where ModelID = 1;结果：执行成功
select * from Models;
select * from Orders;
为空测试用例 - 父子表都有数据，更新子表外键
update Orders set ModelID = 3 where ID =1;结果：执行失败
异常：[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：通不过 on delete cascade 的外键约束检查
测试用例 - 父子表都有数据，更新父表主键
update Models set ModelID = 2 where ModelID =1;结果：执行失败
异常：[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：通不过 on delete cascade 的外键约束检查
测试用例 - 父子表都有数据，更新子表非外键
update Orders set Description = b where ID =1;结果：执行成功
select * from Orders;
1 1 b测试用例 - 父子表都有数据，更新父表非主键
update Models set Name = c where ModelID =1;结果：执行成功
select * from Models;
1 c感谢各位的阅读！关于“Mysq 中 l 建立测试父表、子表及测试用例的示例”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！
向 AI 问一下细节
