7 messages in com.mysql.lists.bugsRe: Bug in new FOREIGN KEY checks in ...| From | Sent On | Attachments |
|---|---|---|
| Steve Hay | 26 Feb 2004 06:42 | |
| Sinisa Milivojevic | 26 Feb 2004 06:47 | |
| Steve Hay | 26 Feb 2004 06:58 | |
| Sinisa Milivojevic | 26 Feb 2004 07:04 | |
| Steve Hay | 26 Feb 2004 07:21 | |
| Sinisa Milivojevic | 26 Feb 2004 07:32 | |
| Steve Hay | 26 Feb 2004 07:56 |
| Subject: | Re: Bug in new FOREIGN KEY checks in MySQLInnoDB/4.0.18 |
|---|---|
| From: | Steve Hay (stev...@uk.radan.com) |
| Date: | 02/26/2004 06:58:03 AM |
| List: | com.mysql.lists.bugs |
Sinisa Milivojevic wrote:
Steve Hay writes:
Hi,
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 constraint fails'
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.
Regards, - Steve
Hi!
Yes, the above is now the expected behaviour and it is documented in our Changelog.
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!
- Steve
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