Database Management Code

Question

Hello all,
This is a bit if a broad brush question but i'm hoping there is someone out there who has encountered a need for this as well.
I'm wondering whether some 'database' management code exists out there (for want of a better description!!).    What I mean by this is I am looking for some code to allow me to select a server and then select a database.  I am developing some code and part of it should allow users to select a database which the application subsequently uses.  The idea is that the database can quickly and easily be changed. 
I am hoping someone can perhaps offer some advise or links to something that already exists perhaps...I hate re-inventing the wheel when I don't have to!!
Thanks