Criar um array multidimensional a partir de uma tabela de banco de dados

public function getTableData(){

 $sql = "SELECT * FROM folders";
 if($stmt = $this->connect->prepare($sql)) {

     $stmt->execute();
     $stmt->close();
     $arrFinalArray = array();
     while ($arrFolder = $stmt->fetch()){

        $arrFinalArray[] = array(
                    'Name'  => $arrFolder['folder_name'], 
                    'Class' => $arrFolder['folder_class'],
                    'Link'  => $arrFolder['folder_link']
        );


     }
  }
}