Gathering database settings globally

[eluser]CrazeD[/eluser]
How can I gather database information globally, instead of on every controller function?

I am working on a project that will have multiple themes. Each user will be able to choose which theme they want to use. Their choice will be recorded in my users MySQL table.

I don't really want to copy/paste the same SQL query 30 times throughout all of my controllers, so is there a way to just do it once and have the variables handy when I need them?

Thanks.