What's the best way to incorporate a constantly changing database into a website?

I want to know what kind of technology I need to use in order to incorporate a constantly changing database (like the database of a hotel affected by daily reservations) into a website so the information in the website is constantly updated according to the changes made in the database. Do I need to buy some sotfware to achieve that? I already got the webdesign sotfware (dreamweaver, flash).|||You can buy or use open source. I prefer MySQL or Oracle XE with PHP. There is a lot of support out there and forums where you can find sample code if you go with these to platforms.|||Take backup of all the database so that u have an idea when the data is changing.