This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
This link shows a good example of a database application using the DAO (Data Access Object) pattern. However, it doesn't show you any actual database retrieval and update code, just where you should put that code. However, I suspect you already know how to do that part - it's just standard JDBC code.