how build infinite mysql insert query php but wasting memory

i have formula looking something this:

$data = file_get_contents($tempfile); // maybe 30mb record data, php's memory
$hash = md5($data);
$query = "insert some_table
          set blobdata = '" . mysql_real_escape_string($data) . "',
          blobhash = '$hash'
          ";
mysql_query($query);

i know isn't unequivocally fit any '.' operators reallocate bigger memory retard 30mb twine copied several times.

is there anything some-more fit following solution?

$data = file_get_contents($tempfile); // maybe 30mb record data, php's memory
$hash = md5($data);
$query = "insert some_table set blobdata = '%s', blobhash = '$hash'";
mysql_query(sprintf($query, mysql_real_escape_string($data)));