FuelPHP Forums

What I trying to achieve
Create an oil task to upgrade old database structure (DATABASE old_db) to new database structure (DATABASE new_db). For this task, I wrote a Upgrader class and store it in

/fuel/app/classes/upgrader.php

Here a snippet of Upgrader class

class Upgrader {

 private $db = NULL;

 private $run = array (
  'option',
  #'department',
  #'location',
  #'status',
  #'role',
  #'brand',
  #'item',
  #'category',
  #'issue',
  #'user'
   );

 public function __construct() {
  $this->$db = \Fuel\Core\Database_MySQL::instance('migrate');

  \DB::query('TRUNCATE TABLE `mappers`')->execute();

  foreach ($this->run as $run) {
   $method = "down_{$run}";
   echo "Calling {$method}";
   $this->{$method}();

   $method = "up_{$run}";
   echo "Calling {$method}";
   $this->{$method}();
   
   echo "Table/Module: {$run} migrated";
   echo "----";
  }
 }
 private function query($sql) {
  return $this->db->query(1, $sql, NULL);
 }
}

This so far work great if I called it from a controller but when I load it from oil refine I got this following error

Mior-Muhammad-Zakis-MacBook-Pro:mobife crynobone$ php oil refine aduit:upgrade
PHP Fatal error:  Cannot redeclare class Fuel\Core\Database in /Users/crynobone/Sites/mobife/fuel/core/classes/database.php on line 18
Compile Error - Cannot redeclare class Fuel\Core\Database in COREPATH/classes/database.php on line 18

So is there something I'm missing? Or is there a better way to use multiple database connection with FuelPHP?