help transfer ring blobs using perl

i am using postgres 7.0.3
and also postgres 7.2.1

I am new towards using blobs,I want to transfers
records with blobs from a table to different
database(postgres) using
perl without extracting the blob to disk(i.e without
using lo_export/lo_import).

Below is my perl script which is not working can
anybody help in this.

$rest = $conn->exec("begin");
$stmt="select * from image ;";
$result = $conn->exec($stmt);
if ( $result->resultStatus ne PGRES_TUPLES_OK )
{
die $conn->errorMessage unless PGRES_TUPLES_OK eq
$result->resultStatus;
}
$n=$result->ntuples;
print "\n Number of Processes Scheduled $n \n";

while ( @row=$result->fetchrow)
{
$fld=$row[0];
$fd=Pg::lo_open($conn,$fld,"r");
if ( $fd )
{
$buf="";
Pg::lo_read($conn,$fd,$buf,20000);
}
Pg::lo_close($conn,$fd);

$foid=Pg::lo_creat($conn,"w");
$fdw=Pg::lo_open($conn,$foid,"w");
Pg::lo_write($conn,$fdw,$buf,20000);
Pg::lo_close($conn,$foid);
$stmt="insert into photo values($foid)";
$resi = $conn->exec($stmt);

if ( $resi->resultStatus ne PGRES_COMMAND_OK )
{
die $conn->errorMessage unless PGRES_TUPLES_OK eq
$resi->resultStatus;
}

}

$rest = $conn->exec("end");

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