1 package DBIx::Class::Storage::DBI::Pg;
6 use base qw/DBIx::Class::Storage::DBI::MultiColumnIn/;
9 use DBD::Pg qw(:pg_types);
11 # Ask for a DBD::Pg with array support
12 warn "DBD::Pg 2.9.2 or greater is strongly recommended\n"
13 if ($DBD::Pg::VERSION < 2.009002); # pg uses (used?) version::qv()
15 sub with_deferred_fk_checks {
16 my ($self, $sub) = @_;
18 $self->_get_dbh->do('SET CONSTRAINTS ALL DEFERRED');
23 my ($self,$source,$col) = @_;
24 my $seq = ( $source->column_info($col)->{sequence} ||= $self->dbh_do('_dbh_get_autoinc_seq', $source, $col) )
25 or $self->throw_exception( "could not determine sequence for "
27 . ".$col, please consider adding a "
28 . "schema-qualified sequence to its column info"
31 $self->_dbh_last_insert_id ($self->_dbh, $seq);
34 # there seems to be absolutely no reason to have this as a separate method,
35 # but leaving intact in case someone is already overriding it
36 sub _dbh_last_insert_id {
37 my ($self, $dbh, $seq) = @_;
38 $dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq});
42 sub _dbh_get_autoinc_seq {
43 my ($self, $dbh, $source, $col) = @_;
46 my $table = $source->name;
48 # deref table name if it needs it
50 if ref $table eq 'SCALAR';
52 # parse out schema name if present
53 if( $table =~ /^(.+)\.(.+)$/ ) {
54 ( $schema, $table ) = ( $1, $2 );
57 my $sqlmaker = $self->sql_maker;
58 local $sqlmaker->{bindtype} = 'normal';
60 my ($where, @bind) = $sqlmaker->where ({
61 'a.attnum' => {'>', 0},
62 'c.relname' => $table,
64 -not_bool => 'a.attisdropped',
65 (defined $schema && length $schema)
66 ? ( 'n.nspname' => $schema )
67 : ( -bool => \'pg_catalog.pg_table_is_visible(c.oid)' )
70 my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind);
73 (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid)
74 FROM pg_catalog.pg_attrdef d
75 WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef)
76 FROM pg_catalog.pg_class c
77 LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
78 JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid
83 defined $seq_expr and length $seq_expr
84 or $self->throw_exception( "no sequence found for $table.$col, check table definition, "
85 . "or explicitly set the 'sequence' for this column in the "
86 . $source->source_name
90 unless ( $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i ){
91 $seq_expr = '' unless defined $seq_expr;
92 $schema = $schema . "." if defined $schema && length $schema;
93 $self->throw_exception("could not parse nextval expression for $schema$table.$col: '$seq_expr'");
100 my ($self,$source,$col) = @_;
108 sub datetime_parser_type { return "DateTime::Format::Pg"; }
110 sub bind_attribute_by_data_type {
111 my ($self,$data_type) = @_;
113 my $bind_attributes = {
114 bytea => { pg_type => DBD::Pg::PG_BYTEA },
115 blob => { pg_type => DBD::Pg::PG_BYTEA },
118 if( defined $bind_attributes->{$data_type} ) {
119 return $bind_attributes->{$data_type};
126 sub _sequence_fetch {
127 my ( $self, $type, $seq ) = @_;
128 my ($id) = $self->_get_dbh->selectrow_array("SELECT nextval('${seq}')");
133 my ($self, $name) = @_;
135 $self->_get_dbh->pg_savepoint($name);
139 my ($self, $name) = @_;
141 $self->_get_dbh->pg_release($name);
145 my ($self, $name) = @_;
147 $self->_get_dbh->pg_rollback_to($name);
156 DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL
160 # In your table classes
161 __PACKAGE__->load_components(qw/PK::Auto Core/);
162 __PACKAGE__->set_primary_key('id');
163 __PACKAGE__->sequence('mysequence');
167 This class implements autoincrements for PostgreSQL.
169 =head1 POSTGRESQL SCHEMA SUPPORT
171 This driver supports multiple PostgreSQL schemas, with one caveat: for
172 performance reasons, data about the search path, sequence names, and
173 so forth is queried as needed and CACHED for subsequent uses.
175 For this reason, once your schema is instantiated, you should not
176 change the PostgreSQL schema search path for that schema's database
177 connection. If you do, Bad Things may happen.
179 You should do any necessary manipulation of the search path BEFORE
180 instantiating your schema object, or as part of the on_connect_do
181 option to connect(), for example:
183 my $schema = My::Schema->connect
186 [ 'SET search_path TO myschema, foo, public' ],
192 See L<DBIx::Class/CONTRIBUTORS>
196 You may distribute this code under the same terms as Perl itself.