Object-oriented best practices.  I'm relatively new to OO in PHP, and i'm trying to make a class to help pull out some page information from my database.  Question is i have several functions to handle different elements of the page that needs to be retrieved from the DB.  I have one single query that can pull out all this information from the database, but i'm trying to figure out what the best way to write this class is so every function doesn't need to make a new database call.