Sinisa Milivojevic wrote:
>Steve Hay writes:
>>I've just upgraded from MySQL 4.0.16 to 4.0.18 and now find that some
>>commands that used to work without error (dropping and re-creating a
>>database) no longer work.
>>The error is:
>> error: 'Cannot delete or update a parent row: a foreign key
>>which presumably relates to the first item in the InnoDB version history
>>(http://www.innodb.com/ibman.php#InnoDB.history). (All the tables in
>>the database concerned are InnoDB tables.)
>>It appears that the foreign key constraint is being checked even when
>>dropping the database, which I assume is not intended.
>>I tried a simple case of one table X referencing another table Y, and
>>"DROP DATABASE" works fine (even with data in it, so foreign key
>>constraints are not being checked here, which is as I would expect). I
>>tried another case with two tables X and Y referencing one table Z, but
>>still no error. Finally, I reproduced my problem by having table X
>>referencing table Y and table Y referencing table Z.
>>The following DOS command-lines result in the error above:
>>I'm running Windows XP SP1.
>Yes, the above is now the expected behaviour and it is documented in
>All you have to do is drop tables in the right order.
I understand that if I was issuing DROP TABLE statements then I would
need to put them in the right order, but I'm doing a DROP DATABASE.
Surely foreign key constraints should not be checked when the entire
database is being dropped.
If they /are/ supposed to be checked then the other cases that I
mentioned above (where DROP DATABASE worked fine) are not working properly!
Radan Computational Ltd.
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