yii空外键 [英] yii null foreign key
问题描述
我有这样的分贝结构 http://pikucha.ru/icFsc (我无法添加图片在这里)
$ b $有些地址我没有地铁(其他表具有相同的问题,例如用户可能没有地址,但有用户表)
如果我在mysql中添加一条记录,那就OK了。如果我用yii做同样的事情,我会得到一个错误:
$ b
无法添加或更新子行:外键约束失败(
address
,CONSTRAINT fk_Address_Area1
FOREIGN KEY( area_id
)REFERENCES area
( id
)ON UPDATE NO ACTION)
那么,问题出在哪里呢?
由于下面提到的一些原因, b $ b 1.数据类型可能与fk和pk不一样。
2.大小可能不一样fk和pk
3.类型可能不同无符号,二进制,无符号二进制和空白
4.您试图放入城市的值不会出现在面积表中
I have such structure of db http://pikucha.ru/icFsc (I can't add pictures here)
Some addresses my not have a metro (other tables have the same problem, for example "user" may not have an address, but there is constraint in "user" table)
If I add a record in mysql it's ok. If I do the same thing using yii I get an error
Cannot add or update a child row: a foreign key constraint fails (
address
, CONSTRAINT fk_Address_Area1
FOREIGN KEY (area_id
) REFERENCES area
(id
) ON UPDATE NO ACTION)
So, what's the problem in?
This error can occur due to some reasons as mentioned below
1. Data Types may not be the same for fk and pk.
2. Size may not be the same of fk and pk
3. type may be different like unsigned, binary,unsigned binary and null
4. The value you are trying to put in city does not occur in area table
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