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package SQL::Translator::Parser::DBI::PostgreSQL;
=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 warnings;
use DBI;
use Data::Dumper;
use SQL::Translator::Schema::Constants;
our ( $DEBUG, @EXPORT_OK );
our $VERSION = '1.59';
$DEBUG = 0 unless defined $DEBUG;
my $actions = {c => 'cascade',
r => 'restrict',
a => 'no action',
n => 'set null',
d => 'set default',
};
sub parse {
my ( $tr, $dbh ) = @_;
my $schema = $tr->schema;
my $column_select = $dbh->prepare(
"SELECT a.attname, format_type(t.oid, a.atttypmod) as typname, a.attnum,
a.atttypmod as length, a.attnotnull, a.atthasdef, ad.adsrc,
d.description
FROM pg_type t, pg_attribute a
LEFT JOIN pg_attrdef ad ON (ad.adrelid = a.attrelid AND a.attnum = ad.adnum)
LEFT JOIN pg_description d ON (a.attrelid=d.objoid AND a.attnum=d.objsubid)
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,
ARRAY(SELECT a.attname
FROM pg_attribute a
WHERE a.attrelid=i.indrelid AND a.attnum = ANY(i.indkey)
) AS attname,
i.indisprimary, pg_get_indexdef(oid) AS create_string
FROM pg_class c,pg_index i
WHERE c.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname='public') AND c.relkind='i'
AND c.oid=i.indexrelid AND i.indrelid=?"
);
my $table_select = $dbh->prepare(
"SELECT c.oid, c.relname, d.description
FROM pg_class c
LEFT JOIN pg_description d ON c.oid=d.objoid AND d.objsubid=0
WHERE relnamespace IN
(SELECT oid FROM pg_namespace WHERE nspname='public')
AND relkind='r';"
);
my $fk_select = $dbh->prepare(
q/
SELECT r.conname,
c.relname,
d.relname AS frelname,
r.conkey,
ARRAY(SELECT column_name::varchar
FROM information_schema.columns
WHERE ordinal_position = ANY (r.conkey)
AND table_schema = n.nspname
AND table_name = c.relname ) AS fields,
r.confkey,
ARRAY(SELECT column_name::varchar
FROM information_schema.columns
WHERE ordinal_position = ANY (r.confkey)
AND table_schema = n.nspname
AND table_name = d.relname ) AS reference_fields,
r.confupdtype,
r.confdeltype,
r.confmatchtype
FROM pg_catalog.pg_constraint r
JOIN pg_catalog.pg_class c
ON c.oid = r.conrelid
AND r.contype = 'f'
JOIN pg_catalog.pg_class d
ON d.oid = r.confrelid
JOIN pg_catalog.pg_namespace n
ON n.oid = c.relnamespace
WHERE pg_catalog.pg_table_is_visible(c.oid)
AND n.nspname = ?
AND c.relname = ?
ORDER BY 1;
/) or die "Can't prepare: $@";
$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;
$table->comments($$tablehash{'description'}) if $$tablehash{'description'};
$column_select->execute($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 && $$columnhash{'length'}<=0xFFFF;
$col->{is_nullable} = $$columnhash{'attnotnull'} ? 0 : 1;
$col->comments($$columnhash{'description'}) if $$columnhash{'description'};
}
$index_select->execute($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 = split /\s+/, $$indexhash{'attname'};
$table->add_index(
name => $$indexhash{'relname'},
type => $type,
fields => \@columns,
) || die $table->error;
}
$fk_select->execute('public',$table_name) or die "Can't execute: $@";
my $fkeys = $fk_select->fetchall_arrayref({});
$DEBUG and print Dumper $fkeys;
for my $con (@$fkeys){
my $con_name = $con->{conname};
my $fields = $con->{fields};
my $reference_fields = $con->{reference_fields};
my $reference_table = $con->{frelname};
my $on_upd = $con->{confupdtype};
my $on_del = $con->{confdeltype};
$table->add_constraint(
name => $con_name,
type => 'foreign_key',
fields => $fields,
reference_fields => $reference_fields,
reference_table => $reference_table,
on_delete => $actions->{$on_upd},
on_update => $actions->{$on_del},
);
}
}
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
|
