findByで1件取得
findOneByXXX()で取得できます。
$this->hoge = Doctrine::getTable('Hoge')->findOneByHogeIdAndFugaId($hogeId, $fugaId);
findOneを使わない場合
$this->hoge = Doctrine::getTable('Hoge')->findByHogeIdAndFugaId($hogeId, $fugaId); $this->hoge = $this->hoge[0];