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