gistfile1.php

<?php

class User extends Model {

  function User() {
    parent::Model();
  }

  function get($username = FALSE) {
    if ($username !== FALSE) {
      $username = (str) $username;
      $query = $this->db->get('users', array('username' => $username), 1, 0);
      if ($query->num_rows() === 1) {
        return $query->row();
      }
    }
    return FALSE;
  }

}