/**
  * Find object by primary key using raw SQL to go fast.
  * Bypass doSelect() and the object formatter by using generated code.
  *
  * @param     mixed $key Primary key to use for the query
  * @param     PropelPDO $con A connection object
  *
  * @return    Comentario A model object, or null if the key is not found
  */
 protected function findPkSimple($key, $con)
 {
     $sql = 'SELECT `ID`, `COMENTARIO`, `ID_USUARIO`, `ID_LIBRO` FROM `comentario` WHERE `ID` = :p0';
     try {
         $stmt = $con->prepare($sql);
         $stmt->bindValue(':p0', $key, PDO::PARAM_INT);
         $stmt->execute();
     } catch (Exception $e) {
         Propel::log($e->getMessage(), Propel::LOG_ERR);
         throw new PropelException(sprintf('Unable to execute SELECT statement [%s]', $sql), $e);
     }
     $obj = null;
     if ($row = $stmt->fetch(PDO::FETCH_NUM)) {
         $obj = new Comentario();
         $obj->hydrate($row);
         ComentarioPeer::addInstanceToPool($obj, (string) $key);
     }
     $stmt->closeCursor();
     return $obj;
 }