/**
  * Retrieve object using using composite pkey values.
  * @param      int $id
  * @param      int $user_id
  * @param      PropelPDO $con
  * @return     PcTestimonial
  */
 public static function retrieveByPK($id, $user_id, PropelPDO $con = null)
 {
     $key = serialize(array((string) $id, (string) $user_id));
     if (null !== ($obj = PcTestimonialPeer::getInstanceFromPool($key))) {
         return $obj;
     }
     if ($con === null) {
         $con = Propel::getConnection(PcTestimonialPeer::DATABASE_NAME, Propel::CONNECTION_READ);
     }
     $criteria = new Criteria(PcTestimonialPeer::DATABASE_NAME);
     $criteria->add(PcTestimonialPeer::ID, $id);
     $criteria->add(PcTestimonialPeer::USER_ID, $user_id);
     $v = PcTestimonialPeer::doSelect($criteria, $con);
     return !empty($v) ? $v[0] : null;
 }