php mysql blob binary file read

public function getDataTable(){

if ($this->input->get_post('table_index') == '') 

        {

            $array = array(

                "response_code" => "200",

                "response_message" => "missing parameter"

         );

     

            $data['result'] = $array;

    $this->load->view('version_check_view', $data);

            return ;

        }

$table_index = $this->input->get_post('table_index');

$gotten = mysql_query("select * from 테이블 이름 where data = ".$table_index." ");   

$row = mysql_fetch_assoc($gotten);

$bytes = $row['출력할 칼럼 값']; 

/* header("Content-type: application/bin");

header('Content-disposition: attachment; filename="data.bin"'); */

print $bytes; 

}