1 package DBIx::Class::Storage::DBI::Pg;
7 DBIx::Class::Storage::DBI::MultiColumnIn
11 use DBD::Pg qw(:pg_types);
13 use Context::Preserve 'preserve_context';
16 # Ask for a DBD::Pg with array support
17 warn __PACKAGE__.": DBD::Pg 2.9.2 or greater is strongly recommended\n"
18 if ($DBD::Pg::VERSION < 2.009002); # pg uses (used?) version::qv()
20 sub _determine_supports_insert_returning {
21 return shift->_server_info->{normalized_dbms_version} >= 8.002
27 sub with_deferred_fk_checks {
28 my ($self, $sub) = @_;
30 my $txn_scope_guard = $self->txn_scope_guard;
32 $self->_do_query('SET CONSTRAINTS ALL DEFERRED');
34 my $sg = Scope::Guard->new(sub {
35 $self->_do_query('SET CONSTRAINTS ALL IMMEDIATE');
38 return preserve_context { $sub->() } after => sub { $txn_scope_guard->commit };
41 # only used when INSERT ... RETURNING is disabled
43 my ($self,$source,@cols) = @_;
48 my $seq = ( $source->column_info($col)->{sequence} ||= $self->dbh_do('_dbh_get_autoinc_seq', $source, $col) )
49 or $self->throw_exception( sprintf(
50 'could not determine sequence for column %s.%s, please consider adding a schema-qualified sequence to its column info',
55 push @values, $self->_dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq});
62 my ($self, $function, $sequence) = @_;
64 $self->throw_exception('No sequence to fetch') unless $sequence;
66 my ($val) = $self->_get_dbh->selectrow_array(
67 sprintf ("select %s('%s')", $function, $sequence)
73 sub _dbh_get_autoinc_seq {
74 my ($self, $dbh, $source, $col) = @_;
77 my $table = $source->name;
79 # deref table name if it needs it
81 if ref $table eq 'SCALAR';
83 # parse out schema name if present
84 if( $table =~ /^(.+)\.(.+)$/ ) {
85 ( $schema, $table ) = ( $1, $2 );
88 # get the column default using a Postgres-specific pg_catalog query
89 my $seq_expr = $self->_dbh_get_column_default( $dbh, $schema, $table, $col );
91 # if no default value is set on the column, or if we can't parse the
92 # default value as a sequence, throw.
93 unless ( defined $seq_expr and $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i ) {
94 $seq_expr = '' unless defined $seq_expr;
95 $schema = "$schema." if defined $schema && length $schema;
96 $self->throw_exception( sprintf (
97 'no sequence found for %s%s.%s, check the RDBMS table definition or explicitly set the '.
98 "'sequence' for this column in %s",
99 $schema ? "$schema." : '',
102 $source->source_name,
109 # custom method for fetching column default, since column_info has a
110 # bug with older versions of DBD::Pg
111 sub _dbh_get_column_default {
112 my ( $self, $dbh, $schema, $table, $col ) = @_;
114 # Build and execute a query into the pg_catalog to find the Pg
115 # expression for the default value for this column in this table.
116 # If the table name is schema-qualified, query using that specific
119 # Otherwise, find the table in the standard Postgres way, using the
120 # search path. This is done with the pg_catalog.pg_table_is_visible
121 # function, which returns true if a given table is 'visible',
122 # meaning the first table of that name to be found in the search
125 # I *think* we can be assured that this query will always find the
126 # correct column according to standard Postgres semantics.
130 my $sqlmaker = $self->sql_maker;
131 local $sqlmaker->{bindtype} = 'normal';
133 my ($where, @bind) = $sqlmaker->where ({
134 'a.attnum' => {'>', 0},
135 'c.relname' => $table,
137 -not_bool => 'a.attisdropped',
138 (defined $schema && length $schema)
139 ? ( 'n.nspname' => $schema )
140 : ( -bool => \'pg_catalog.pg_table_is_visible(c.oid)' )
143 my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind);
146 (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid)
147 FROM pg_catalog.pg_attrdef d
148 WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef)
149 FROM pg_catalog.pg_class c
150 LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
151 JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid
164 sub datetime_parser_type { return "DateTime::Format::Pg"; }
166 sub bind_attribute_by_data_type {
167 my ($self,$data_type) = @_;
169 my $bind_attributes = {
170 bytea => { pg_type => DBD::Pg::PG_BYTEA },
171 blob => { pg_type => DBD::Pg::PG_BYTEA },
174 if( defined $bind_attributes->{$data_type} ) {
175 return $bind_attributes->{$data_type};
183 my ($self, $name) = @_;
185 $self->_get_dbh->pg_savepoint($name);
189 my ($self, $name) = @_;
191 $self->_get_dbh->pg_release($name);
195 my ($self, $name) = @_;
197 $self->_get_dbh->pg_rollback_to($name);
200 sub deployment_statements {
202 my ($schema, $type, $version, $dir, $sqltargs, @rest) = @_;
207 ! exists $sqltargs->{producer_args}{postgres_version}
209 my $dver = $self->_server_info->{normalized_dbms_version}
211 $sqltargs->{producer_args}{postgres_version} = $dver;
214 $self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
223 DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL
227 # In your result (table) classes
228 use base 'DBIx::Class::Core';
229 __PACKAGE__->set_primary_key('id');
230 __PACKAGE__->sequence('mysequence');
234 This class implements autoincrements for PostgreSQL.
236 =head1 POSTGRESQL SCHEMA SUPPORT
238 This driver supports multiple PostgreSQL schemas, with one caveat: for
239 performance reasons, data about the search path, sequence names, and
240 so forth is queried as needed and CACHED for subsequent uses.
242 For this reason, once your schema is instantiated, you should not
243 change the PostgreSQL schema search path for that schema's database
244 connection. If you do, Bad Things may happen.
246 You should do any necessary manipulation of the search path BEFORE
247 instantiating your schema object, or as part of the on_connect_do
248 option to connect(), for example:
250 my $schema = My::Schema->connect
253 [ 'SET search_path TO myschema, foo, public' ],
259 See L<DBIx::Class/CONTRIBUTORS>
263 You may distribute this code under the same terms as Perl itself.