public function darEstudiantesResponsables() { $estudiantes = array(); $res = $this->persistenceManager->performCustomQuery("SELECT * FROM persona, estudiante WHERE persona_id = estudiante_persona AND EXISTS\r\n (SELECT * FROM responsable WHERE persona_id = responsable_persona)"); if (!$res) { return $estudiantes; } foreach ($res as $rsEntity) { $entityTmp = new Estudiante(); $entityTmp->loadFromSqlResultQuery($rsEntity); $estudiantes[] = $entityTmp; } return $estudiantes; }