This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
DB2 has supported java triggers since version 5.2. You can create a trigger that does what you'd like - but you're best off keeping it simple (if you want heavy stuff done, use the trigger to put a message in a queue - or a "queue" table that the other process polls and processes.