Mysq中l建立测试父表、子表及测试用例的示例

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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    aselect * 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    aselect * 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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