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package SQL::Translator::Parser::DBI::PostgreSQL;
# -------------------------------------------------------------------
# $Id: PostgreSQL.pm,v 1.10 2007-06-04 04:01:14 mwz444 Exp $
# -------------------------------------------------------------------
# Copyright (C) 2002-4 SQLFairy Authors
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307 USA
# -------------------------------------------------------------------
=head1 NAME
SQL::Translator::Parser::DBI::PostgreSQL - parser for DBD::Pg
=head1 SYNOPSIS
See SQL::Translator::Parser::DBI.
=head1 DESCRIPTION
Uses DBI to query PostgreSQL system tables to determine schema structure.
=cut
use strict;
use DBI;
use Data::Dumper;
use SQL::Translator::Schema::Constants;
use vars qw[ $DEBUG $VERSION @EXPORT_OK ];
$VERSION = sprintf "%d.%02d", q$Revision: 1.10 $ =~ /(\d+)\.(\d+)/;
$DEBUG = 0 unless defined $DEBUG;
# -------------------------------------------------------------------
sub parse {
my ( $tr, $dbh ) = @_;
my $schema = $tr->schema;
my $column_select = $dbh->prepare(
"SELECT a.attname, t.typname, a.attnum,a.atttypmod as length,
a.attnotnull, a.atthasdef, d.adsrc
FROM pg_type t,pg_attribute a
LEFT JOIN pg_attrdef d ON (d.adrelid = a.attrelid AND a.attnum = d.adnum)
WHERE a.attrelid=? AND attnum>0
AND a.atttypid=t.oid
ORDER BY a.attnum"
);
my $index_select = $dbh->prepare(
"SELECT oid, c.relname, i.indkey, i.indnatts, i.indisunique,
i.indisprimary, pg_get_indexdef(oid) AS create_string
FROM pg_class c,pg_index i
WHERE c.relnamespace=2200 AND c.relkind='i'
AND c.oid=i.indexrelid AND i.indrelid=?"
);
my $table_select = $dbh->prepare(
"SELECT oid,relname FROM pg_class WHERE relnamespace IN
(SELECT oid FROM pg_namespace WHERE nspname='public')
AND relkind='r';"
);
$table_select->execute();
while ( my $tablehash = $table_select->fetchrow_hashref ) {
my $table_name = $$tablehash{'relname'};
my $table_oid = $$tablehash{'oid'};
my $table = $schema->add_table(
name => $table_name,
#what is type? type => $table_info->{TABLE_TYPE},
) || die $schema->error;
$column_select->execute($table_oid);
while (my $columnhash = $column_select->fetchrow_hashref ) {
#data_type seems to not be populated; perhaps there needs to
#be a mapping of query output to reserved constants in sqlt?
my $col = $table->add_field(
name => $$columnhash{'attname'},
default_value => $$columnhash{'adsrc'},
data_type => $$columnhash{'typname'},
order => $$columnhash{'attnum'},
) || die $table->error;
$col->{size} = [$$columnhash{'length'}] if $$columnhash{'length'}>0;
$col->{is_nullable} = $$columnhash{'attnotnull'} ? 0 : 1;
}
$index_select->execute($table_oid);
my @column_names = $table->field_names();
while (my $indexhash = $index_select->fetchrow_hashref ) {
#don't deal with function indexes at the moment
next if ($$indexhash{'indkey'} eq ''
or !defined($$indexhash{'indkey'}) );
my $type;
if ($$indexhash{'indisprimary'}) {
$type = UNIQUE; #PRIMARY_KEY;
#tell sqlt that this is the primary key:
my $col_name=$column_names[($$indexhash{'indkey'} - 1)];
$table->get_field($col_name)->{is_primary_key}=1;
} elsif ($$indexhash{'indisunique'}) {
$type = UNIQUE;
} else {
$type = NORMAL;
}
my @column_ids = split /\s+/, $$indexhash{'indkey'};
my @columns;
foreach my $col (@column_ids) {
push @columns, $column_names[($col - 1)];
}
$table->add_index(
name => $$indexhash{'relname'},
type => $type,
fields => \@columns,
) || die $table->error;
}
}
return 1;
}
1;
# -------------------------------------------------------------------
# Time is a waste of money.
# Oscar Wilde
# -------------------------------------------------------------------
=pod
=head1 AUTHOR
Scott Cain E<lt>cain@cshl.eduE<gt>, previous author:
Paul Harrington E<lt>harringp@deshaw.comE<gt>.
=head1 SEE ALSO
SQL::Translator, DBD::Pg.
=cut
|
