Getting a users name from id

[eluser]egunay[/eluser]
Hello,

I'm stuck on some point about database. I mean I know how to do it on old school php but as I'm still new to framework and oop I want to learn the proper way.

I'm trying to build a blog and ofcourse I want to show author information under the title. As in database I'm storing the author data as ID, when I load the page I see the user id not user's name.

What should I do to show the name instead of the id?