$mg = new CRM_Mailing_DAO_MailingGroup();
$mg->mailing_id = $ids['mailing_id'];
$mg->entity_table = ($entity == 'groups') ? $groupTableName : $mailingTableName;
$mg = new CRM_Mailing_DAO_MailingGroup();
$mg->mailing_id = $ids['mailing_id'];
$mg->entity_table = ($entity == 'groups') ? $groupTableName : $mailingTableName;