Application to automatically search and scrape a website

What application should I use that automatically access a website to gather information?

Basically I have a database that completes calculations for me; however I have to manually gather the parameters from a website and input these into my database.

What I would like is have an application that will do the following:

1. I enter name of a product,
2. The application accesses the website, using the site's search function to locate information on the product,
3. The application downloads certain inf开发者_如何学运维ormation on that product,
4. It performs calculations on that information, then
5. Displays the results of those calculations to me

This is a little out of my depth but I’m willing to learn no matter how complicated the software.

You're not looking for a database. You need to write an application that will go and get data from web pages and then stuff these into a database. i.e. you need to build a "crawler" or "scraper", then drop the results into some database such as MySQL.