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From "Myrna van Lunteren (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-160) Foreign key constraint failure closes the cursors in embedded mode but not in Network Server mode
Date Tue, 14 Jul 2009 14:44:14 GMT

    [ https://issues.apache.org/jira/browse/DERBY-160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730882#action_12730882
] 

Myrna van Lunteren commented on DERBY-160:
------------------------------------------

Although there's a difference between embedded and network server it seems to me either way
could be seen as acceptable...
Or is there a standard/spec reference that clearly states the cursors should be closed?
I can also imagine an application could work-around this by doing a check on a delete failing
and just not do the next, making sure it always works the same way - whether with embedded
or NetworkServer.

Because of these two reasons, I marked the urgency 'normal'.

Eduardo - in case you're still interested...
This is classified as 'Major' (the default priority), not 'Critical'. It's not a crash, and
not incorrect data returned, and I think it has a possible workaround, so I think the priority
is correct and the urgency is normal...
I checked the archives and noticed you also sent a message to derby-user that went unanswered.
Normally our community tries to be more responsive than that...

If you are still interested and find this a critical issue, you could 'vote' for it which
would increase the impact the community gives to it. Or you could attempt to address it yourself.
If you'd like that, you can start by reading: http://wiki.apache.org/db-derby/ForNewDevelopers
and link to: http://wiki.apache.org/db-derby/DerbyCommitProcess.

> Foreign key constraint failure closes the cursors in embedded mode but not in Network
Server mode
> -------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-160
>                 URL: https://issues.apache.org/jira/browse/DERBY-160
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.0.2.1
>            Reporter: Mamta A. Satoor
>
> When running embedded Derby in autocommit true mode(default), a foreign key violation
closes the open cursors. But the cursors remain open after the foreign key violation when
Derby is running in Network Server. Following code can be tried in ij for embedded and network
server to see the behavior difference.
> create table tableWithPrimaryKey (c1 int not null, c2 int not null, constraint pk primary
key(c1,c2));
> create table tableWithConstraint (c1 int, c2 int, constraint fk foreign key(c1,c2) references
tableWithPrimaryKey);
> create table t1 (c11 int, c12 int);
> insert into t1 values (1,1), (2,2), (3,3);
> insert into tableWithPrimaryKey values (1, 1), (2, 2), (3, 3), (4, 4);
> insert into tableWithConstraint values (1, 1), (2, 2), (3, 3), (4, 4);
> get cursor c1 as 'select * from t1';
> next c1;
> -- In both embedded and Network server modes, delete below will throw exception "ERROR
23503: DELETE on 
> -- table 'TABLEWITHPRIMARYKEY' caused a violation of foreign key constraint 'FK' for
key (1,1).  
> -- The statement has been rolled back."
> delete from tableWithPrimaryKey;
> -- In embedded mode, next on cursor below throws exception "ERROR XCL16: ResultSet not
open, operation 'next' not
> -- permitted. Verify that autocommit is OFF." But in Network Server mode, the cursor
is still open and 
> -- next c1 spits out contents of next row.
> next c1;

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