Question about SQL authentication.

I haven't yet downloaded Free Radius, but looks to be the solutions I'm in search of. My question is this. We already have a db developed and running that maintains all customers, usersnames, passwords, static wan IP, ect. I would love to be able to have FreeRadius query my db for those fields to authenticate the user. I don't care about any of the accounting stuff since it isn't and hasn't been used in a long time. Any insight to this would be great! Kelly