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package DBIx::DBSchema::DBD::Pg;
use strict;
use vars qw($VERSION @ISA %typemap);
use DBD::Pg 1.22;
use DBIx::DBSchema::DBD;
$VERSION = '0.08';
@ISA = qw(DBIx::DBSchema::DBD);
%typemap = (
'BLOB' => 'BYTEA',
'LONG VARBINARY' => 'BYTEA',
);
=head1 NAME
DBIx::DBSchema::DBD::Pg - PostgreSQL native driver for DBIx::DBSchema
=head1 SYNOPSIS
use DBI;
use DBIx::DBSchema;
$dbh = DBI->connect('dbi:Pg:dbname=database', 'user', 'pass');
$schema = new_native DBIx::DBSchema $dbh;
=head1 DESCRIPTION
This module implements a PostgreSQL-native driver for DBIx::DBSchema.
=cut
sub columns {
my($proto, $dbh, $table) = @_;
my $sth = $dbh->prepare(<<END) or die $dbh->errstr;
SELECT a.attname, t.typname, a.attlen, a.atttypmod, a.attnotnull,
a.atthasdef, a.attnum
FROM pg_class c, pg_attribute a, pg_type t
WHERE c.relname = '$table'
AND a.attnum > 0 AND a.attrelid = c.oid AND a.atttypid = t.oid
ORDER BY a.attnum
END
$sth->execute or die $sth->errstr;
map {
my $default = '';
if ( $_->{atthasdef} ) {
my $attnum = $_->{attnum};
my $d_sth = $dbh->prepare(<<END) or die $dbh->errstr;
SELECT substring(d.adsrc for 128) FROM pg_attrdef d, pg_class c
WHERE c.relname = '$table' AND c.oid = d.adrelid AND d.adnum = $attnum
END
$d_sth->execute or die $d_sth->errstr;
$default = $d_sth->fetchrow_arrayref->[0];
};
my $len = '';
if ( $_->{attlen} == -1 && $_->{atttypmod} != -1
&& $_->{typname} ne 'text' ) {
$len = $_->{atttypmod} - 4;
if ( $_->{typname} eq 'numeric' ) {
$len = ($len >> 16). ','. ($len & 0xffff);
}
}
my $type = $_->{'typname'};
$type = 'char' if $type eq 'bpchar';
[
$_->{'attname'},
$type,
! $_->{'attnotnull'},
$len,
$default,
'' #local
];
} @{ $sth->fetchall_arrayref({}) };
}
sub primary_key {
my($proto, $dbh, $table) = @_;
my $sth = $dbh->prepare(<<END) or die $dbh->errstr;
SELECT a.attname, a.attnum
FROM pg_class c, pg_attribute a, pg_type t
WHERE c.relname = '${table}_pkey'
AND a.attnum > 0 AND a.attrelid = c.oid AND a.atttypid = t.oid
END
$sth->execute or die $sth->errstr;
my $row = $sth->fetchrow_hashref or return '';
$row->{'attname'};
}
sub unique {
my($proto, $dbh, $table) = @_;
my $gratuitous = { map { $_ => [ $proto->_index_fields($dbh, $_ ) ] }
grep { $proto->_is_unique($dbh, $_ ) }
$proto->_all_indices($dbh, $table)
};
}
sub index {
my($proto, $dbh, $table) = @_;
my $gratuitous = { map { $_ => [ $proto->_index_fields($dbh, $_ ) ] }
grep { ! $proto->_is_unique($dbh, $_ ) }
$proto->_all_indices($dbh, $table)
};
}
sub _all_indices {
my($proto, $dbh, $table) = @_;
my $sth = $dbh->prepare(<<END) or die $dbh->errstr;
SELECT c2.relname
FROM pg_class c, pg_class c2, pg_index i
WHERE c.relname = '$table' AND c.oid = i.indrelid AND i.indexrelid = c2.oid
END
$sth->execute or die $sth->errstr;
map { $_->{'relname'} }
grep { $_->{'relname'} !~ /_pkey$/ }
@{ $sth->fetchall_arrayref({}) };
}
sub _index_fields {
my($proto, $dbh, $index) = @_;
my $sth = $dbh->prepare(<<END) or die $dbh->errstr;
SELECT a.attname, a.attnum
FROM pg_class c, pg_attribute a, pg_type t
WHERE c.relname = '$index'
AND a.attnum > 0 AND a.attrelid = c.oid AND a.atttypid = t.oid
END
$sth->execute or die $sth->errstr;
map { $_->{'attname'} } @{ $sth->fetchall_arrayref({}) };
}
sub _is_unique {
my($proto, $dbh, $index) = @_;
my $sth = $dbh->prepare(<<END) or die $dbh->errstr;
SELECT i.indisunique
FROM pg_index i, pg_class c, pg_am a
WHERE i.indexrelid = c.oid AND c.relname = '$index' AND c.relam = a.oid
END
$sth->execute or die $sth->errstr;
my $row = $sth->fetchrow_hashref or die 'guru meditation #420';
$row->{'indisunique'};
}
=head1 AUTHOR
Ivan Kohler <ivan-dbix-dbschema@420.am>
=head1 COPYRIGHT
Copyright (c) 2000 Ivan Kohler
Copyright (c) 2000 Mail Abuse Prevention System LLC
All rights reserved.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=head1 BUGS
Yes.
columns doesn't return column default information.
=head1 SEE ALSO
L<DBIx::DBSchema>, L<DBIx::DBSchema::DBD>, L<DBI>, L<DBI::DBD>
=cut
1;
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