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|
#-*- perl -*-
#
# Copyright (C) 2005 Ken'ichi Fukamachi
# All rights reserved.
#
# $FML$
#
package IO::Adapter::PostgreSQL;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
my $debug = 0;
use IO::Adapter::DBI;
push(@ISA, 'IO::Adapter::DBI');
=head1 NAME
IO::Adapter::PostgreSQL - interface to talk with a PostgreSQL server.
=head1 SYNOPSIS
use IO::Adapter;
my $map = 'postgresql:toymodel';
my $map_params = {
$map => {
sql_server => 'localhost',
user => 'fukachan',
user_password => 'uja',
database => 'fml',
table => 'ml',
params => {
ml_name => 'elena',
file => 'members',
},
},
};
my $obj = new IO::Adapter ($map, $map_params);
$obj->open();
$obj->add( 'rudo@nuinui.net' );
$obj->close();
=head1 DESCRIPTION
This module is a top level driver to talk with a PostgreSQL server in SQL
(Structured Query Language).
This module inherits C<IO::Adapter::DBI> class.
The model dependent SQL statement is expected to be holded in
C<IO::Adapter::SQL::> modules.
You can specify your own module name at $args->{ driver } in
new($args).
It is expected to provide C<add()> and C<delete()> methods.
=head1 METHODS
=head2 configure($me, $args)
IO::Adapter::PostgreSQL specific configuration loader.
It also calles IO::Adapter::SQL::$model module for model specific
customizatoins and functions.
=cut
# Descriptions: initialize PostgreSQL specific configuration.
# Arguments: OBJ($self) HASH_REF($me) HASH_REF($args)
# Side Effects: none
# Return Value: none
sub configure
{
my ($self, $me, $args) = @_;
my $map = $me->{ _map }; # e.g. "postgresql:toymodel"
my $config = $args->{ "[$map]" };
# import variables
for my $key (qw(sql_server
sql_servers
sql_database
sql_table
sql_user
sql_password)) {
$me->{ "_$key" } = $config->{ $key } || '';
}
my $host0 = $config->{ sql_server };
my $_list = $config->{ sql_servers };
my (@array) = split(/\s+/, $_list);
my (@hosts) = @array ? (@array) : ( $host0 );
my $list = [];
for my $host (@hosts) {
use IO::Adapter::DBI;
my $dsn = IO::Adapter::DBI->make_dsn( {
driver => 'mysql',
database => $config->{ sql_database },
host => $host,
});
push(@$list, $dsn);
}
# save the current DSN list (ARRAY_REF).
$me->{ _dsn_list } = $list;
# save map specific configuration
$me->{ _config } = $config;
}
=head2 setpos($pos)
set position in returned cache.
=cut
# Descriptions: set position in returned cache.
# Arguments: OBJ($self) NUM($pos)
# Side Effects: none
# Return Value: none
sub setpos
{
my ($self, $pos) = @_;
my $i = 0;
# requested position $pos is later here
if ($pos > $self->{ _row_pos }) {
$i = $pos - $self->{ _row_pos } - 1;
}
else {
# hmm, rollback() is not supported on postgresql.
# we need to restart this session.
my $args = $self->{ _args };
$self->close($args);
$self->open($args);
$i = $pos - 1;
}
# discard
while ($i-- > 0) { $self->get_next_key();}
}
=head2 getpos()
get position in returned cache.
=cut
# Descriptions: get position in returned cache.
# Arguments: OBJ($self)
# Side Effects: none
# Return Value: NUM
sub getpos
{
my ($self) = @_;
return $self->{ _row_pos };
}
=head2 eof()
check if EOF or not?
=cut
# Descriptions: check if EOF or not?
# Arguments: OBJ($self)
# Side Effects: none
# Return Value: 1 or 0
sub eof
{
my ($self) = @_;
# XXX-TODO: correct ?
return( $self->{ _row_pos } < $self->{ _row_max } ? 0 : 1 );
}
=head1 SEE ALSO
L<DBI>,
L<DBD::Pg>,
L<IO::Adapter::DBI>
=head1 CODING STYLE
See C<http://www.fml.org/software/FNF/> on fml coding style guide.
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2005 Ken'ichi Fukamachi
All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 HISTORY
IO::Adapter::File first appeared in fml8 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
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