To what extent can google bots see your page?

Just curious...

I know they can crawl html pages and dynamic php pages but can they actually see the code of a php page? Or just the output?

Also, what about databases? I am 99.9 percent sure they cant see into your database but I would like to be 100% sure...

Trying to hide some blackhat code...

Thanks!

They can only see the HTML output. Obviously they can also see all the associated files as well such as the .css, the javascript files, etc... but not your database or any server side programming languages (such as PHP).

Sweet im in the clear... thanks joaquin112