use strict;
use warnings;
-use base qw/DBIx::Class::Storage::DBI::MultiColumnIn/;
+use base qw/
+ DBIx::Class::Storage::DBI::MultiColumnIn
+/;
use mro 'c3';
use DBD::Pg qw(:pg_types);
+use Scope::Guard ();
+use Context::Preserve 'preserve_context';
+use namespace::clean;
+
+__PACKAGE__->sql_limit_dialect ('LimitOffset');
# Ask for a DBD::Pg with array support
-warn "DBD::Pg 2.9.2 or greater is strongly recommended\n"
+warn __PACKAGE__.": DBD::Pg 2.9.2 or greater is strongly recommended\n"
if ($DBD::Pg::VERSION < 2.009002); # pg uses (used?) version::qv()
+sub _determine_supports_insert_returning {
+ return shift->_server_info->{normalized_dbms_version} >= 8.002
+ ? 1
+ : 0
+ ;
+}
+
sub with_deferred_fk_checks {
my ($self, $sub) = @_;
- $self->_get_dbh->do('SET CONSTRAINTS ALL DEFERRED');
- $sub->();
-}
+ my $txn_scope_guard = $self->txn_scope_guard;
-sub last_insert_id {
- my ($self,$source,$col) = @_;
- my $seq = ($source->column_info($col)->{sequence} ||= $self->get_autoinc_seq($source,$col))
- or $self->throw_exception( "could not determine sequence for "
- . $source->name
- . ".$col, please consider adding a "
- . "schema-qualified sequence to its column info"
- );
-
- $self->_dbh_last_insert_id ($self->_dbh, $seq);
-}
+ $self->_do_query('SET CONSTRAINTS ALL DEFERRED');
+
+ my $sg = Scope::Guard->new(sub {
+ $self->_do_query('SET CONSTRAINTS ALL IMMEDIATE');
+ });
-# there seems to be absolutely no reason to have this as a separate method,
-# but leaving intact in case someone is already overriding it
-sub _dbh_last_insert_id {
- my ($self, $dbh, $seq) = @_;
- $dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq});
+ return preserve_context { $sub->() } after => sub { $txn_scope_guard->commit };
}
+# only used when INSERT ... RETURNING is disabled
+sub last_insert_id {
+ my ($self,$source,@cols) = @_;
-sub _get_pg_search_path {
- my ($self,$dbh) = @_;
- # cache the search path as ['schema','schema',...] in the storage
- # obj
- $self->{_pg_search_path} ||= do {
- my @search_path;
- my ($sp_string) = $dbh->selectrow_array('SHOW search_path');
- while( $sp_string =~ s/("[^"]+"|[^,]+),?// ) {
- unless( defined $1 and length $1 ) {
- $self->throw_exception("search path sanity check failed: '$1'")
- }
- push @search_path, $1;
- }
- \@search_path
- };
-}
+ my @values;
-sub _dbh_get_autoinc_seq {
- my ($self, $dbh, $schema, $table, $col) = @_;
-
- # get the list of postgres schemas to search. if we have a schema
- # specified, use that. otherwise, use the search path
- my @search_path;
- if( defined $schema and length $schema ) {
- @search_path = ( $schema );
- } else {
- @search_path = @{ $self->_get_pg_search_path($dbh) };
- }
+ my $col_info = $source->columns_info(\@cols);
- # find the sequence(s) of the column in question (should have nextval declared on it)
- my @sequence_names;
- foreach my $search_schema (@search_path) {
- my $info = $dbh->column_info(undef,$search_schema,$table,$col)->fetchrow_hashref;
- if($info && defined $info->{COLUMN_DEF}
- && $info->{COLUMN_DEF} =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i
- ) {
- push @sequence_names, $1;
- }
- }
+ for my $col (@cols) {
+ my $seq = ( $col_info->{$col}{sequence} ||= $self->dbh_do('_dbh_get_autoinc_seq', $source, $col) )
+ or $self->throw_exception( sprintf(
+ 'could not determine sequence for column %s.%s, please consider adding a schema-qualified sequence to its column info',
+ $source->name,
+ $col,
+ ));
- if (@sequence_names != 1) {
- $self->throw_exception (sprintf
- q|Unable to reliably determine autoinc sequence name for '%s'.'%s' (possible candidates: %s)|,
- $table,
- $col,
- join (', ', (@sequence_names ? @sequence_names : 'none found') ),
- );
+ push @values, $self->_dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq});
}
- my $seq = $sequence_names[0];
+ return @values;
+}
- if( $seq !~ /\./ ) {
- my $sth = $dbh->prepare (
- 'SELECT * FROM "information_schema"."sequences" WHERE "sequence_name" = ?'
- );
- $sth->execute ($seq);
+sub _sequence_fetch {
+ my ($self, $function, $sequence) = @_;
- my @seen_in_schemas;
- while (my $h = $sth->fetchrow_hashref) {
- push @seen_in_schemas, $h->{sequence_schema};
- }
+ $self->throw_exception('No sequence to fetch') unless $sequence;
- if (not @seen_in_schemas) {
- $self->throw_exception (sprintf
- q|Automatically determined autoinc sequence name '%s' for '%s'.'%s' does not seem to exist...'|,
- $seq,
- $table,
- $col,
- );
- }
- elsif (@seen_in_schemas > 1) {
- $self->throw_exception (sprintf
- q|Unable to reliably fully-qualify automatically determined autoinc sequence name '%s' for '%s'.'%s' (same name exist in schemas: %s)|,
- $seq,
- $table,
- $col,
- join (', ', (@seen_in_schemas)),
- );
- }
- else {
- my $sql_maker = $self->sql_maker;
- $seq = join ('.', map { $sql_maker->_quote ($_) } ($seen_in_schemas[0], $seq) );
- }
- }
+ my ($val) = $self->_get_dbh->selectrow_array(
+ sprintf ("select %s('%s')", $function, (ref $sequence eq 'SCALAR') ? $$sequence : $sequence)
+ );
- return $seq;
+ return $val;
}
-sub get_autoinc_seq {
- my ($self,$source,$col) = @_;
+sub _dbh_get_autoinc_seq {
+ my ($self, $dbh, $source, $col) = @_;
my $schema;
my $table = $source->name;
- if (ref $table eq 'SCALAR') {
- $table = $$table;
+ # deref table name if it needs it
+ $table = $$table
+ if ref $table eq 'SCALAR';
+
+ # parse out schema name if present
+ if( $table =~ /^(.+)\.(.+)$/ ) {
+ ( $schema, $table ) = ( $1, $2 );
}
- elsif ($table =~ /^(.+)\.(.+)$/) {
- ($schema, $table) = ($1, $2);
+
+ # get the column default using a Postgres-specific pg_catalog query
+ my $seq_expr = $self->_dbh_get_column_default( $dbh, $schema, $table, $col );
+
+ # if no default value is set on the column, or if we can't parse the
+ # default value as a sequence, throw.
+ unless ( defined $seq_expr and $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i ) {
+ $seq_expr = '' unless defined $seq_expr;
+ $schema = "$schema." if defined $schema && length $schema;
+ $self->throw_exception( sprintf (
+ 'no sequence found for %s%s.%s, check the RDBMS table definition or explicitly set the '.
+ "'sequence' for this column in %s",
+ $schema ? "$schema." : '',
+ $table,
+ $col,
+ $source->source_name,
+ ));
}
- $self->dbh_do('_dbh_get_autoinc_seq', $schema, $table, $col);
+ return $1;
}
+# custom method for fetching column default, since column_info has a
+# bug with older versions of DBD::Pg
+sub _dbh_get_column_default {
+ my ( $self, $dbh, $schema, $table, $col ) = @_;
+
+ # Build and execute a query into the pg_catalog to find the Pg
+ # expression for the default value for this column in this table.
+ # If the table name is schema-qualified, query using that specific
+ # schema name.
+
+ # Otherwise, find the table in the standard Postgres way, using the
+ # search path. This is done with the pg_catalog.pg_table_is_visible
+ # function, which returns true if a given table is 'visible',
+ # meaning the first table of that name to be found in the search
+ # path.
+
+ # I *think* we can be assured that this query will always find the
+ # correct column according to standard Postgres semantics.
+ #
+ # -- rbuels
+
+ my $sqlmaker = $self->sql_maker;
+ local $sqlmaker->{bindtype} = 'normal';
+
+ my ($where, @bind) = $sqlmaker->where ({
+ 'a.attnum' => {'>', 0},
+ 'c.relname' => $table,
+ 'a.attname' => $col,
+ -not_bool => 'a.attisdropped',
+ (defined $schema && length $schema)
+ ? ( 'n.nspname' => $schema )
+ : ( -bool => \'pg_catalog.pg_table_is_visible(c.oid)' )
+ });
+
+ my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind);
+
+SELECT
+ (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid)
+ FROM pg_catalog.pg_attrdef d
+ WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef)
+FROM pg_catalog.pg_class c
+ LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
+ JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid
+$where
+
+EOS
+
+ return $seq_expr;
+}
+
+
sub sqlt_type {
return 'PostgreSQL';
}
}
}
-sub _sequence_fetch {
- my ( $self, $type, $seq ) = @_;
- my ($id) = $self->_get_dbh->selectrow_array("SELECT nextval('${seq}')");
- return $id;
-}
-
sub _svp_begin {
my ($self, $name) = @_;
$self->_get_dbh->pg_rollback_to($name);
}
+sub deployment_statements {
+ my $self = shift;;
+ my ($schema, $type, $version, $dir, $sqltargs, @rest) = @_;
+
+ $sqltargs ||= {};
+
+ if (
+ ! exists $sqltargs->{producer_args}{postgres_version}
+ and
+ my $dver = $self->_server_info->{normalized_dbms_version}
+ ) {
+ $sqltargs->{producer_args}{postgres_version} = $dver;
+ }
+
+ $self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
+}
+
1;
__END__
=head1 SYNOPSIS
- # In your table classes
- __PACKAGE__->load_components(qw/PK::Auto Core/);
+ # In your result (table) classes
+ use base 'DBIx::Class::Core';
__PACKAGE__->set_primary_key('id');
- __PACKAGE__->sequence('mysequence');
=head1 DESCRIPTION
=head1 POSTGRESQL SCHEMA SUPPORT
-This supports multiple PostgreSQL schemas, with one caveat: for
-performance reasons, the schema search path is queried the first time it is
-needed and CACHED for subsequent uses.
+This driver supports multiple PostgreSQL schemas, with one caveat: for
+performance reasons, data about the search path, sequence names, and
+so forth is queried as needed and CACHED for subsequent uses.
+
+For this reason, once your schema is instantiated, you should not
+change the PostgreSQL schema search path for that schema's database
+connection. If you do, Bad Things may happen.
-For this reason, you should do any necessary manipulation of the
-PostgreSQL search path BEFORE instantiating your schema object, or as
-part of the on_connect_do option to connect(), for example:
+You should do any necessary manipulation of the search path BEFORE
+instantiating your schema object, or as part of the on_connect_do
+option to connect(), for example:
my $schema = My::Schema->connect
( $dsn,$user,$pass,
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