Hi Michael, great to see you here!

Now to the problem:

Perhaps it's not that hard. You filter three informal messages (5701, 5703, 5704) comming from the server.
AFAIK one of them is an 'environment' message, telling the client that the current database has changed.
You could use this message, to determine whether the database has changed.

btw. I could use this message too in a small project i'm doing at the moment. :-)
It's not hard to change DBD::Sybase, but it's not easy to have DBD::Sybase compiled in some win32 environments, so i have to wait for activestate :-(