It isn't that simple to do this, as you probably know. You need to build in some common sense routines to display a date or a series of mutually-exclusive radio buttons. And range checking and other routines to make sure that people don't do SQL injections on your databases. That is where Ngotha comes into play.
There are many web-to-database tools out there, and some really good ones such as Alpha Software's latest release that simplify the creation of dynamic websites. But if you just need a few simple forms, then check out Ngotha. The service costs $25 per month for up to 30 tables, or unlimited use for $49 a month.
You can see their intro one-minute video that explains the process:
There is also Wufoo.com, which is a form builder with hosted data collections, which we last wrote about here and has since been acquired by SurveyMonkey. Ngotha doesn't host anything: it is just a converter to help you build better HTML forms. Your data lives where it always has lived, that is your business.