Mysq中l创建测试父表、子表及测试用例归纳总结

SQL是Structured Query Language(结构化查询语言)的缩写。SQL是专为数据库而建立的操作命令集，是一种功能齐全的数据库语言。在使用它时，只需要发出“做什么”的命令，“怎么做”是不用使用者考虑的。SQL功能强大、简单易学、使用方便，已经成为了数据库操作的基础，并且现在几乎所有的数据库均支持SQL。

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; 为空 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

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