/usr/share/perl5/Apache/Session/Store/Postgres.pm is in libapache-session-perl 1.93-2ubuntu1.
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#
# Apache::Session::Store::Postgres
# Implements session object storage via Postgres
# Copyright(c) 1998, 1999, 2000 Jeffrey William Baker (jwbaker@acm.org)
# Distribute under the Perl License
#
############################################################################
package Apache::Session::Store::Postgres;
use strict;
use DBI;
use Apache::Session::Store::DBI;
use vars qw(@ISA $VERSION);
@ISA = qw(Apache::Session::Store::DBI);
$VERSION = '1.03';
$Apache::Session::Store::Postgres::DataSource = undef;
$Apache::Session::Store::Postgres::UserName = undef;
$Apache::Session::Store::Postgres::Password = undef;
sub connection {
my $self = shift;
my $session = shift;
return if (defined $self->{dbh});
$self->{'table_name'} = $session->{args}->{TableName} || $Apache::Session::Store::DBI::TableName;
if (exists $session->{args}->{Handle}) {
$self->{dbh} = $session->{args}->{Handle};
$self->{commit} = $session->{args}->{Commit};
return;
}
my $datasource = $session->{args}->{DataSource} ||
$Apache::Session::Store::Postgres::DataSource;
my $username = $session->{args}->{UserName} ||
$Apache::Session::Store::Postgres::UserName;
my $password = $session->{args}->{Password} ||
$Apache::Session::Store::Postgres::Password;
$self->{dbh} = DBI->connect(
$datasource,
$username,
$password,
{ RaiseError => 1, AutoCommit => 0 }
) || die $DBI::errstr;
#If we open the connection, we close the connection
$self->{disconnect} = 1;
#the programmer has to tell us what commit policy to use
$self->{commit} = $session->{args}->{Commit};
}
sub materialize {
my $self = shift;
my $session = shift;
$self->connection($session);
local $self->{dbh}->{RaiseError} = 1;
if (!defined $self->{materialize_sth}) {
$self->{materialize_sth} =
$self->{dbh}->prepare_cached(qq{
SELECT a_session FROM $self->{'table_name'} WHERE id = ? FOR UPDATE});
}
$self->{materialize_sth}->bind_param(1, $session->{data}->{_session_id});
$self->{materialize_sth}->execute;
my $results = $self->{materialize_sth}->fetchrow_arrayref;
if (!(defined $results)) {
$self->{materialize_sth}->finish;
die "Object does not exist in the data store";
}
$self->{materialize_sth}->finish;
$session->{serialized} = $results->[0];
}
sub DESTROY {
my $self = shift;
if ($self->{commit}) {
$self->{dbh}->commit;
}
if ($self->{disconnect}) {
$self->{dbh}->disconnect;
}
}
1;
=pod
=head1 NAME
Apache::Session::Store::Postgres - Store persistent data in a Postgres database
=head1 SYNOPSIS
use Apache::Session::Store::Postgres;
my $store = new Apache::Session::Store::Postgres;
$store->insert($ref);
$store->update($ref);
$store->materialize($ref);
$store->remove($ref);
=head1 DESCRIPTION
Apache::Session::Store::Postgres fulfills the storage interface of
Apache::Session. Session data is stored in a Postgres database.
=head1 SCHEMA
To use this module, you will need at least these columns in a table
called 'sessions', or another name if you supply the TableName parameter.
id char(32) # or however long your session IDs are.
a_session text # This has an ~8 KB limit :(
To create this schema, you can execute this command using the psql program:
CREATE TABLE sessions (
id char(32) not null primary key,
a_session text
);
If you use some other command, ensure that there is a unique index on the
table's id column.
=head1 CONFIGURATION
The module must know what datasource, username, and password to use when
connecting to the database. These values can be set using the options hash
(see Apache::Session documentation). The options are:
=over 4
=item DataSource
=item UserName
=item Password
=item Handle
=item TableName
=back
Example:
tie %hash, 'Apache::Session::Postgres', $id, {
DataSource => 'dbi:Pg:dbname=database',
UserName => 'database_user',
Password => 'K00l'
};
Instead, you may pass in an already-opened DBI handle to your database.
tie %hash, 'Apache::Session::Postgres', $id, {
Handle => $dbh
};
=head1 AUTHOR
This modules was written by Jeffrey William Baker <jwbaker@acm.org>
A fix for the commit policy was contributed by Michael Schout <mschout@gkg.net>
=head1 SEE ALSO
L<Apache::Session>, L<Apache::Session::Store::DBI>
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