Database and SVG file

I'm wondering if anyone can make suggestions on learning how to
manipulate an SVG file with a database or if anyone has a simple example
with source files.

Reasons:
I'm a salesman whose territory consists of 3 states. Within those states
are counties. As sales begin to increase per county, the Fill Color of
that county is edited by me via Inkscape. It would be nice to drive
those colors via database and not have to alter the SVG file every time
I make a large sale.

*This can be a very powerful tool for organizations who want to better
understand their territories in real time and visualize growth patterns
over a period of time.

I really want to learn how to do this!



-Aubrey