Greetings all, I'm looking for a more efficient way to grab multiple users without too much code redundancy.

I have a Users class, (here's a highly condensed representation)

    Class Users {

    function __construct() { ... ... }

    private static function getNew($id) {

         // This is all only example code
         $sql = "SELECT * FROM Users WHERE User_ID=?";

         $user = new User();
         $user->setID($id);
         ....

         return $user;
}
  public static function getNewestUsers($count) {
     $sql = "SELECT * FROM Users ORDER BY Join_Date LIMIT ?";

     $users = array();

     // Prepared Statement Data Here
     while($stmt->fetch()) {
        $users[] = Users::getNew($id);
        ...
     }
     return $users;
   }
   // These have more sanity/security checks, demonstration only.
   function setID($id) { $this->id = $id; }
   function setName($name) { $this->name = $name; }
 ...
}

So clearly calling getNew() in a loop is inefficient, because it makes $count number of calls to the database each time. I would much rather select all users in a single SQL statement.

The problem is that I have probably a dozen or so methods for getting arrays of users, so all of these would now need to know the names of the database columns which is repeating a lot of structure that could always change later.

What are some other ways that I could approach this problem? My goals include efficiency, flexibility, scalability, and good design practice.