Re(2): Large Object dump ?

You can try the script I made for exporting all my Pg database.
Ideas were borrowed from pg_dumplo-0.0.5.
Make it sure that you have "Perl5 extension for PostgreSQL - Pg.pm"
installed.

sherwin

#!/usr/bin/perl -w
#
# Export large objects of all Pg database
# - Sherwin T. Daganato (win(at)email(dot)com(dot)ph)
# - October 8, 2000
#

use strict;
use Pg;

my $space = shift || die "Usage: $0 outputdir";

# make sure the directory doesn't end in '/'
$space =~ s/\/$//;

my $conn_all = Pg::connectdb("dbname=template1");
die $conn_all->errorMessage unless PGRES_CONNECTION_OK eq
$conn_all->status;

# find all database
my $sql = "SELECT datname FROM pg_database ORDER BY datname";
my $res_all = $conn_all->exec($sql);
die $conn_all->errorMessage unless PGRES_TUPLES_OK eq
$res_all->resultStatus;

my $counter = 0;
while (my ($database) = $res_all->fetchrow) {
my $conn_db = Pg::connectdb("dbname=$database");
die $conn_db->errorMessage unless PGRES_CONNECTION_OK eq
$conn_db->status;

# find any candidate tables with columns of type oid
$sql = qq/SELECT c.relname, a.attname
FROM pg_class c, pg_attribute a, pg_type t
WHERE a.attnum > 0
AND a.attrelid = c.oid
AND a.atttypid = t.oid
AND t.typname = 'oid'
AND c.relname NOT LIKE 'pg_%';
/;

my $res_db = $conn_db->exec($sql);
die $conn_db->errorMessage unless PGRES_TUPLES_OK eq
$res_db->resultStatus;

my $path;
local (*F);
while (my ($table, $fld) = $res_db->fetchrow) {

# find large object id
$sql = sprintf ("SELECT x.%s FROM %s x WHERE EXISTS (SELECT c.oid FROM
pg_class c WHERE c.relkind = 'l' AND x.%s = c.oid)",
$fld, $table, $fld);

# find large object id
#$sql = sprintf ("SELECT x.%s FROM %s x, pg_class c WHERE x.%s = c.oid
and c.relkind = 'l'",
# $fld, $table, $fld);

my $res_tbl = $conn_db->exec($sql);
die $conn_db->errorMessage unless PGRES_TUPLES_OK eq
$res_tbl->resultStatus;

my $tuples;
next unless (($tuples = $res_tbl->ntuples) > 0);
$counter += $tuples;

$path = sprintf ("%s/%s", $space, $database);

if ( -d $path) {

# creates file if it don't exist and appends to it
open(F,">>$path/lo_dump.index") || die "\n $0 Cannot open $! \n";
} else {

# create dir for database
mkdir($path, 0755) || die "\n Can't create $path: $! \n";

# opens file for writing. overwrite existing file
open(F, ">$path/lo_dump.index") || die "\n $0 Cannot open $! \n";

# temporarily turn off warnings
# there might be undef
local $^W = 0;

print F "#\n# This is the PostgreSQL large object dump index\n#\n";
printf F "#\tDate: %s\n", scalar(localtime);
printf F "#\tHost: %s\n", $conn_db->host;
printf F "#\tDatabase: %s\n", $conn_db->db;
printf F "#\tUser: %s\n", $conn_db->user;
printf F "#\n# oid\ttable\tattribut\tinfile\n#\n";
}

$path = sprintf ("%s/%s", $path, $table);

# create dir for table
mkdir($path, 0755) || die "\n Can't create $path: $! \n";

$path = sprintf ("%s/%s", $path, $fld);

# create dir for field
mkdir($path, 0755) || die "\n Can't create $path: $! \n";

printf "dump %s.%s (%d large obj)\n", $table, $fld, $tuples;

while (my ($lobjOid) = $res_tbl->fetchrow) {

$path = sprintf ("%s/%s/%s/%s/%s",
$space, $database, $table, $fld, $lobjOid);

my $res_lobj = $conn_db->exec("BEGIN");
die $conn_db->errorMessage unless PGRES_COMMAND_OK eq
$res_lobj->resultStatus;

# export large object
if ( 1 == $conn_db->lo_export($lobjOid, $path) ) {
printf F "%s\t%s\t%s\t%s/%s/%s/%s\n",
$lobjOid, $table, $fld, $database, $table, $fld, $lobjOid;
} else {
printf STDERR "%s: %s\n", $conn_db->errorMessage, $0;
}

$res_lobj = $conn_db->exec("END");
die $conn_db->errorMessage unless PGRES_COMMAND_OK eq
$res_lobj->resultStatus;

}
close(F);
}
undef $conn_db;
}

printf "\nExported %d large objects.\n\n", $counter;
undef $conn_all;

alex(at)sunrise(dot)radiostudiodelta(dot)it writes:
>
>
>On Mon, 30 Oct 2000, tjk(at)tksoft(dot)com wrote:
>
>>Large objects are not dumped. It should be
>>in the documentation for large objects.
>>
>>You need to write a script which writes them to
>>disk and then imports them back in after you have
>>installed your dbs.
>>
>>
>>Troy
>
>CREATE TABLE news -- { chiave: id news ,newarchivio, newsnuove}
>(
> "idnews" SERIAL primary key,
> "oidnotizia" OID, -- news as large object
> "autore" TEXTx -- author
>);
>
>How should be done the script for this table ?
>
>I found something about large object only onthe programmesg guide are they
>present in other docs?
>
>Thanks in advance
>
>Alex
>
>
>