package DBIx::Class::Schema::Loader::DBI::Pg;
use strict;
use warnings;
use base 'DBIx::Class::Schema::Loader::DBI::Component::QuotedDefault';
use mro 'c3';
our $VERSION = '0.07046';
=head1 NAME
DBIx::Class::Schema::Loader::DBI::Pg - DBIx::Class::Schema::Loader::DBI
PostgreSQL Implementation.
=head1 DESCRIPTION
See L<DBIx::Class::Schema::Loader> and L<DBIx::Class::Schema::Loader::Base>.
=cut
sub _setup {
my $self = shift;
$self->next::method(@_);
$self->{db_schema} ||= ['public'];
if (not defined $self->preserve_case) {
$self->preserve_case(0);
}
elsif ($self->preserve_case) {
$self->schema->storage->sql_maker->quote_char('"');
$self->schema->storage->sql_maker->name_sep('.');
}
}
sub _system_schemas {
my $self = shift;
return ($self->next::method(@_), 'pg_catalog');
}
my %pg_rules = (
a => 'NO ACTION',
r => 'RESTRICT',
c => 'CASCADE',
n => 'SET NULL',
d => 'SET DEFAULT',
);
sub _table_fk_info {
my ($self, $table) = @_;
my $sth = $self->dbh->prepare_cached(<<"EOF");
select constr.conname, to_ns.nspname, to_class.relname, from_col.attname, to_col.attname,
constr.confdeltype, constr.confupdtype, constr.condeferrable
from pg_catalog.pg_constraint constr
join pg_catalog.pg_namespace from_ns on constr.connamespace = from_ns.oid
join pg_catalog.pg_class from_class on constr.conrelid = from_class.oid and from_class.relnamespace = from_ns.oid
join pg_catalog.pg_class to_class on constr.confrelid = to_class.oid
join pg_catalog.pg_namespace to_ns on to_class.relnamespace = to_ns.oid
-- can't do unnest() until 8.4, so join against a series table instead
join pg_catalog.generate_series(1, pg_catalog.current_setting('max_index_keys')::integer) colnum(i)
on colnum.i <= pg_catalog.array_upper(constr.conkey,1)
join pg_catalog.pg_attribute to_col
on to_col.attrelid = constr.confrelid
and to_col.attnum = constr.confkey[colnum.i]
join pg_catalog.pg_attribute from_col
on from_col.attrelid = constr.conrelid
and from_col.attnum = constr.conkey[colnum.i]
where from_ns.nspname = ?
and from_class.relname = ?
and from_class.relkind = 'r'
and constr.contype = 'f'
order by constr.conname, colnum.i
EOF
$sth->execute($table->schema, $table->name);
my %rels;
while (my ($fk, $remote_schema, $remote_table, $col, $remote_col,
$delete_rule, $update_rule, $is_deferrable) = $sth->fetchrow_array) {
push @{ $rels{$fk}{local_columns} }, $self->_lc($col);
push @{ $rels{$fk}{remote_columns} }, $self->_lc($remote_col);
$rels{$fk}{remote_table} = DBIx::Class::Schema::Loader::Table->new(
loader => $self,
name => $remote_table,
schema => $remote_schema,
) unless exists $rels{$fk}{remote_table};
$rels{$fk}{attrs} ||= {
on_delete => $pg_rules{$delete_rule},
on_update => $pg_rules{$update_rule},
is_deferrable => $is_deferrable,
};
}
return [ map { $rels{$_} } sort keys %rels ];
}
sub _table_uniq_info {
my ($self, $table) = @_;
# Use the default support if available
return $self->next::method($table)
if $DBD::Pg::VERSION >= 1.50;
my @uniqs;
# Most of the SQL here is mostly based on
# Rose::DB::Object::Metadata::Auto::Pg, after some prodding from
# John Siracusa to use his superior SQL code :)
my $attr_sth = $self->{_cache}->{pg_attr_sth} ||= $self->dbh->prepare(
q{SELECT attname FROM pg_catalog.pg_attribute
WHERE attrelid = ? AND attnum = ?}
);
my $uniq_sth = $self->{_cache}->{pg_uniq_sth} ||= $self->dbh->prepare(
q{SELECT x.indrelid, i.relname, x.indkey
FROM
pg_catalog.pg_index x
JOIN pg_catalog.pg_class c ON c.oid = x.indrelid
JOIN pg_catalog.pg_class i ON i.oid = x.indexrelid
JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE
x.indisunique = 't' AND
x.indpred IS NULL AND
c.relkind = 'r' AND
i.relkind = 'i' AND
n.nspname = ? AND
c.relname = ?
ORDER BY i.relname}
);
$uniq_sth->execute($table->schema, $table->name);
while(my $row = $uniq_sth->fetchrow_arrayref) {
my ($tableid, $indexname, $col_nums) = @$row;
$col_nums =~ s/^\s+//;
my @col_nums = split(/\s+/, $col_nums);
my @col_names;
foreach (@col_nums) {
$attr_sth->execute($tableid, $_);
my $name_aref = $attr_sth->fetchrow_arrayref;
push(@col_names, $self->_lc($name_aref->[0])) if $name_aref;
}
# skip indexes with missing column names (e.g. expression indexes)
if(@col_names == @col_nums) {
push(@uniqs, [ $indexname => \@col_names ]);
}
}
return \@uniqs;
}
sub _table_comment {
my $self = shift;
my ($table) = @_;
my $table_comment = $self->next::method(@_);
return $table_comment if $table_comment;
($table_comment) = $self->dbh->selectrow_array(<<'EOF', {}, $table->name, $table->schema);
SELECT pg_catalog.obj_description(oid)
FROM pg_catalog.pg_class
WHERE relname=? AND relnamespace=(SELECT oid FROM pg_catalog.pg_namespace WHERE nspname=?)
EOF
return $table_comment
}
sub _column_comment {
my $self = shift;
my ($table, $column_number, $column_name) = @_;
my $column_comment = $self->next::method(@_);
return $column_comment if $column_comment;
return $self->dbh->selectrow_array(<<'EOF', {}, $column_number, $table->name, $table->schema);
SELECT pg_catalog.col_description(oid, ?)
FROM pg_catalog.pg_class
WHERE relname=? AND relnamespace=(SELECT oid FROM pg_catalog.pg_namespace WHERE nspname=?)
EOF
}
# Make sure data_type's that don't need it don't have a 'size' column_info, and
# set the correct precision for datetime and varbit types.
sub _columns_info_for {
my $self = shift;
my ($table) = @_;
my $result = $self->next::method(@_);
while (my ($col, $info) = each %$result) {
my $data_type = $info->{data_type};
# these types are fixed size
# XXX should this be a negative match?
if ($data_type =~
/^(?:bigint|int8|bigserial|serial8|bool(?:ean)?|box|bytea|cidr|circle|date|double precision|float8|inet|integer|int|int4|line|lseg|macaddr|money|path|point|polygon|real|float4|smallint|int2|serial|serial4|text)\z/i) {
delete $info->{size};
}
# for datetime types, check if it has a precision or not
elsif ($data_type =~ /^(?:interval|time|timestamp)\b/i) {
if (lc($data_type) eq 'timestamp without time zone') {
$info->{data_type} = 'timestamp';
}
elsif (lc($data_type) eq 'time without time zone') {
$info->{data_type} = 'time';
}
my ($precision) = $self->schema->storage->dbh
->selectrow_array(<<EOF, {}, $table->name, $col);
SELECT datetime_precision
FROM information_schema.columns
WHERE table_name = ? and column_name = ?
EOF
if ($data_type =~ /^time\b/i) {
if ((not defined $precision) || $precision !~ /^\d/) {
delete $info->{size};
}
else {
my ($integer_datetimes) = $self->dbh
->selectrow_array('show integer_datetimes');
my $max_precision =
$integer_datetimes =~ /^on\z/i ? 6 : 10;
if ($precision == $max_precision) {
delete $info->{size};
}
else {
$info->{size} = $precision;
}
}
}
elsif ((not defined $precision) || $precision !~ /^\d/ || $precision == 6) {
delete $info->{size};
}
else {
$info->{size} = $precision;
}
}
elsif ($data_type =~ /^(?:bit(?: varying)?|varbit)\z/i) {
$info->{data_type} = 'varbit' if $data_type =~ /var/i;
my ($precision) = $self->dbh->selectrow_array(<<EOF, {}, $table->name, $col);
SELECT character_maximum_length
FROM information_schema.columns
WHERE table_name = ? and column_name = ?
EOF
$info->{size} = $precision if $precision;
$info->{size} = 1 if (not $precision) && lc($data_type) eq 'bit';
}
elsif ($data_type =~ /^(?:numeric|decimal)\z/i && (my $size = $info->{size})) {
$size =~ s/\s*//g;
my ($scale, $precision) = split /,/, $size;
$info->{size} = [ $precision, $scale ];
}
elsif (lc($data_type) eq 'character varying') {
$info->{data_type} = 'varchar';
if (not $info->{size}) {
$info->{data_type} = 'text';
$info->{original}{data_type} = 'varchar';
}
}
elsif (lc($data_type) eq 'character') {
$info->{data_type} = 'char';
}
else {
my ($typetype) = $self->schema->storage->dbh
->selectrow_array(<<EOF, {}, $data_type);
SELECT typtype
FROM pg_catalog.pg_type
WHERE typname = ?
EOF
if ($typetype && $typetype eq 'e') {
# The following will extract a list of allowed values for the enum.
my $order_column = $self->dbh->{pg_server_version} >= 90100 ? 'enumsortorder' : 'oid';
$info->{extra}{list} = $self->dbh
->selectcol_arrayref(<<EOF, {}, $info->{data_type});
SELECT e.enumlabel
FROM pg_catalog.pg_enum e
JOIN pg_catalog.pg_type t ON t.oid = e.enumtypid
WHERE t.typname = ?
ORDER BY e.$order_column
EOF
# Store its original name in extra for SQLT to pick up.
$info->{extra}{custom_type_name} = $info->{data_type};
$info->{data_type} = 'enum';
delete $info->{size};
}
}
# process SERIAL columns
if (ref($info->{default_value}) eq 'SCALAR'
&& ${ $info->{default_value} } =~ /\bnextval\('([^:]+)'/i) {
$info->{is_auto_increment} = 1;
$info->{sequence} = $1;
delete $info->{default_value};
}
# alias now() to current_timestamp for deploying to other DBs
if ((eval { lc ${ $info->{default_value} } }||'') eq 'now()') {
# do not use a ref to a constant, that breaks Data::Dump output
${$info->{default_value}} = 'current_timestamp';
my $now = 'now()';
$info->{original}{default_value} = \$now;
}
# detect 0/1 for booleans and rewrite
if ($data_type =~ /^bool/i && exists $info->{default_value}) {
if ($info->{default_value} eq '0') {
my $false = 'false';
$info->{default_value} = \$false;
}
elsif ($info->{default_value} eq '1') {
my $true = 'true';
$info->{default_value} = \$true;
}
}
}
return $result;
}
sub _view_definition {
my ($self, $view) = @_;
my $def = $self->schema->storage->dbh->selectrow_array(<<'EOF', {}, $view->schema, $view->name);
SELECT pg_catalog.pg_get_viewdef(oid)
FROM pg_catalog.pg_class
WHERE relnamespace = (SELECT OID FROM pg_catalog.pg_namespace WHERE nspname = ?)
AND relname = ?
EOF
# The definition is returned as a complete statement including the
# trailing semicolon, but that's not allowed in CREATE VIEW, so
# strip it out
$def =~ s/\s*;\s*\z//;
return $def;
}
=head1 SEE ALSO
L<DBIx::Class::Schema::Loader>, L<DBIx::Class::Schema::Loader::Base>,
L<DBIx::Class::Schema::Loader::DBI>
=head1 AUTHORS
See L<DBIx::Class::Schema::Loader/AUTHORS>.
=head1 LICENSE
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=cut
1;