In addition to Gavin's good suggestions, I'd also like to add
that the current/recent Interact -ahem- Enterprise Solutions
magazine had a nice article regarding JDBC. I forgot, who from
Minisoft wrote it, but he did resist the temptation to make it
just a plug for their product. I enjoyed reading it.

By the way, you may also feel free to pick any number of free
examples from my web page; some do deal with JDBC to Image/SQL.
(http://www.editcorp.com/personal/lars_appel/index.html#tips).

L.