Chane connection with db - symfony 1.4

changeConnection.php

<?php
// connect with other database
// $instance - object with new database data
new sfDoctrineDatabase(array(
  'name' => 'instance',
  'dsn' => 'mysql:host=' . $instance->getInstanceDbHost() . ';dbname=' . $instance->getInstanceDbName(),
  'username' => $instance->getInstanceDbUser(),
  'password' => $instance->getInstanceDbPassword(),
));

// do something with new db

// back to connection from database.yml
Doctrine_Manager::getInstance()->getCurrentConnection()->close();

$db = sfContext::getInstance()->getDatabaseManager()->getDatabase('doctrine');
$params = array(
  $db->getParameter('dsn'),
  $db->getParameter('username'),
  $db->getParameter('password'),
  'doctrine'
);
        
Doctrine_Manager::getInstance()->connection($params);
?>