You can use the jdbc adapter for notifications too. it may not be supported on your db version, but it should still work…i think. But, if your deadset on using odbc, try using the Sun jdbc-odbc bridge. I recall there were some serious limiations (i think it had to do with connection pooling or multi-threading) with the bridge; might be as safe as using Cloudscape 
Lastly, the ES Adapter (pre-6 days) had an odbc adapter, which is probably still supported an available, but you want to avoid pre-6 adapters for obvious reasons. I think jdbc is the way to go, if you can get notifications supported on your Db. You could always schedule your own SELECT From service using built-in scheduler and java or com interface.
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