DB Configuration before building.

Hi I liked this wiki so much that i want to customize its look per my choice and run it on my database. I have the code with me and want to know few things : 1) How can I configure the database to Oracle, (before building the archive, to avoid repetitive work).I have tried over writing the hibernate files with my config, but the moment i use "mvn install", it sets back to the default HSQL db. Where do i need to make a change for hibernate files to use my DB properties. 2) How can I change the default user (XWIKI / XWIKI). I would be really thankful for any help. Thanks Gaurav