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From "Dag H. Wanvik (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1252) Old clients with new server return wrong database metadata values for some methods
Date Thu, 27 Jul 2006 18:11:14 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1252?page=comments#action_12423879 ] 
Dag H. Wanvik commented on DERBY-1252:

Yes, that's what I had in mind for my "alternative two" above. If
people are OK with that approach I can make a patch for it.

People finding this solution unacceptable should speak out now. I will
start on it in within a couple of days if there is no push back.

> Old clients with new server return wrong database metadata values for some methods
> ----------------------------------------------------------------------------------
>                 Key: DERBY-1252
>                 URL: http://issues.apache.org/jira/browse/DERBY-1252
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client, Network Server
>    Affects Versions:,,,,,,,,
>            Reporter: Dag H. Wanvik
>            Priority: Minor
>             Fix For:
> With an old client (10.1.1, 10.1.2) accessing a new (10.2) server,
> some metadata calls will return the wrong value for both the JCC and
> the Derby clients:
> 	 deletesAreDetected(TYPE_SCROLL_INSENSITIVE) -> true
> 	 updatedAreDetected(TYPE_SCROLL_INSENSITIVE) -> true
> 	 ownDeletesAreVisible(TYPE_SCROLL_INSENSITIVE) -> true
> 	 ownUpdatesAreVisible(TYPE_SCROLL_INSENSITIVE) -> true
> This happens because these values were changed for the 10.2 with
> the addition of updatable scrollable insensitive result sets (DERBY-775),
> combined with a weakness in the way the client and the server 
> cooperates to answer these metadata calls.
> Presently, when the client application invokes these methods, the
> results will be returned by the server without regard to the identity
> of the client, i.e. the 2-tuple {JCC or Derby client, client version}.
> The values to be returned for the methods in question are based solely
> on the values found in the file metadata_net.properties, which is part
> of the server.
> In general, some database metadata is dependent on the combination of
> the capabilities in the client and the server and the returned values
> should reflect this, which in general implies negotiating (down) to
> values which are correct for the actual combination of client and
> server.

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