Обсуждение: Link to a file stored in a database (PostgreSQL)

Hi:

I want store files in PostgreSQL and retrieve it
without put files in a temp directory.

For example, PHP can create image files with:

header("Content-type: image/gif");

and call this file image.php ... each time somebody
calls this file, PHP must create the image.

I need do the same but with a file stored in a
database.
For example, I want store a PDF file in a database and
could get it with a link.

Thanks a lot.

Xevi.


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On Mon, 2002-05-27 at 22:30, re ert wrote:
> Hi:
>
> I want store files in PostgreSQL and retrieve it
> without put files in a temp directory.
>
> For example, PHP can create image files with:
>
> header("Content-type: image/gif");
>
> and call this file image.php ... each time somebody
> calls this file, PHP must create the image.
>
> I need do the same but with a file stored in a
> database.
> For example, I want store a PDF file in a database and
> could get it with a link.

I have tried to do this with mixed success, storing the binary files as
a 'large object' within PostgreSQL.

The basic function, as you surmise, is to send the appropriate headers,
get the data out of the database and pump it out to the user.  Here's a
fragment from my server:

  Header("Content-type: $content_type");
  error_log("LO ID is >>$loid<<", 0);
  $rid = pg_exec( $img_db, "BEGIN;" );
  $fd = pg_loopen( $img_db, intval($loid), "r" );
  $fstats = fstat($fd);
  error_log("Img bytes should be: " . $fstats[7], 0);
  Header("Content-length: $fstats[7]");
  pg_loreadall( $fd );
  pg_loclose($fd);
  $rid = pg_exec( $img_db, "COMMIT;");

The biggest gotcha seemed to be that all LO access needs to occur within
a transaction.

Cheers,
                    Andrew.
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