$session = CRM_Core_Session::singleton();
$session->set('ufID', $uid);
$session->set('userID', $contact_id);
CRM_Core_DAO::executeQuery('SET @civicrm_user_id = %1',
$session = CRM_Core_Session::singleton();
$session->set('ufID', $uid);
$session->set('userID', $contact_id);
CRM_Core_DAO::executeQuery('SET @civicrm_user_id = %1',