sub with_deferred_fk_checks {
my ($self, $sub) = @_;
- $self->dbh->do('SET CONSTRAINTS ALL DEFERRED');
+ $self->_get_dbh->do('SET CONSTRAINTS ALL DEFERRED');
$sub->();
}
+sub last_insert_id {
+ my ($self,$source,@cols) = @_;
+
+ my @values;
+
+ for my $col (@cols) {
+ my $seq = ( $source->column_info($col)->{sequence} ||= $self->dbh_do('_dbh_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"
+ );
+
+ push @values, $self->_dbh_last_insert_id ($self->_dbh, $seq);
+ }
+
+ return @values;
+}
+
+# there seems to be absolutely no reason to have this as a separate method,
+# but leaving intact in case someone is already overriding it
sub _dbh_last_insert_id {
my ($self, $dbh, $seq) = @_;
$dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq});
}
-sub last_insert_id {
- my ($self,$source,$col) = @_;
- my $seq = ($source->column_info($col)->{sequence} ||= $self->get_autoinc_seq($source,$col));
- $self->throw_exception("could not fetch primary key for " . $source->name . ", could not "
- . "get autoinc sequence for $col (check that table and column specifications are correct "
- . "and in the correct case)") unless defined $seq;
- $self->dbh_do('_dbh_last_insert_id', $seq);
-}
sub _dbh_get_autoinc_seq {
- my ($self, $dbh, $schema, $table, @pri) = @_;
-
- while (my $col = shift @pri) {
- my $info = $dbh->column_info(undef,$schema,$table,$col)->fetchrow_hashref;
- if(defined $info->{COLUMN_DEF} and
- $info->{COLUMN_DEF} =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/) {
- my $seq = $1;
- # may need to strip quotes -- see if this works
- return $seq =~ /\./ ? $seq : $info->{TABLE_SCHEM} . "." . $seq;
- }
- }
- return;
-}
-
-sub get_autoinc_seq {
- my ($self,$source,$col) = @_;
-
- my @pri = $source->primary_columns;
+ my ($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);
+
+ # use DBD::Pg to fetch the column info if it is recent enough to
+ # work. otherwise, use custom SQL
+ my $seq_expr = $DBD::Pg::VERSION >= 2.015001
+ ? eval{ $dbh->column_info(undef,$schema,$table,$col)->fetchrow_hashref->{COLUMN_DEF} }
+ : $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( "no sequence found for $schema$table.$col, check table definition, "
+ . "or explicitly set the 'sequence' for this column in the "
+ . $source->source_name
+ . " class"
+ );
}
- $self->dbh_do('_dbh_get_autoinc_seq', $schema, $table, @pri);
+ 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';
}
bytea => { pg_type => DBD::Pg::PG_BYTEA },
blob => { pg_type => DBD::Pg::PG_BYTEA },
};
-
+
if( defined $bind_attributes->{$data_type} ) {
return $bind_attributes->{$data_type};
}
sub _sequence_fetch {
my ( $self, $type, $seq ) = @_;
- my ($id) = $self->dbh->selectrow_array("SELECT nextval('${seq}')");
+ my ($id) = $self->_get_dbh->selectrow_array("SELECT nextval('${seq}')");
return $id;
}
sub _svp_begin {
my ($self, $name) = @_;
- $self->dbh->pg_savepoint($name);
+ $self->_get_dbh->pg_savepoint($name);
}
sub _svp_release {
my ($self, $name) = @_;
- $self->dbh->pg_release($name);
+ $self->_get_dbh->pg_release($name);
}
sub _svp_rollback {
my ($self, $name) = @_;
- $self->dbh->pg_rollback_to($name);
+ $self->_get_dbh->pg_rollback_to($name);
}
1;
+__END__
+
=head1 NAME
DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL
This class implements autoincrements for PostgreSQL.
+=head1 POSTGRESQL SCHEMA SUPPORT
+
+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.
+
+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,
+ { on_connect_do =>
+ [ 'SET search_path TO myschema, foo, public' ],
+ },
+ );
+
=head1 AUTHORS
-Marcus Ramberg <m.ramberg@cpan.org>
+See L<DBIx::Class/CONTRIBUTORS>
=head1 LICENSE
projects / dbsrgits/DBIx-Class.git / blobdiff