1 package DBIx::Class::Storage::DBI::Pg;
6 use base qw/DBIx::Class::Storage::DBI/;
9 use Context::Preserve 'preserve_context';
10 use DBIx::Class::Carp;
14 __PACKAGE__->sql_limit_dialect ('LimitOffset');
15 __PACKAGE__->sql_quote_char ('"');
16 __PACKAGE__->datetime_parser_type ('DateTime::Format::Pg');
17 __PACKAGE__->_use_multicolumn_in (1);
19 __PACKAGE__->mk_group_accessors('simple' =>
22 sub _determine_supports_insert_returning {
23 return shift->_server_info->{normalized_dbms_version} >= 8.002
29 sub with_deferred_fk_checks {
30 my ($self, $sub) = @_;
32 my $txn_scope_guard = $self->txn_scope_guard;
34 $self->_do_query('SET CONSTRAINTS ALL DEFERRED');
36 my $sg = Scope::Guard->new(sub {
37 $self->_do_query('SET CONSTRAINTS ALL IMMEDIATE');
40 return preserve_context { $sub->() } after => sub { $txn_scope_guard->commit };
43 # only used when INSERT ... RETURNING is disabled
45 my ($self,$source,@cols) = @_;
49 my $col_info = $source->columns_info(\@cols);
52 my $seq = ( $col_info->{$col}{sequence} ||= $self->dbh_do('_dbh_get_autoinc_seq', $source, $col) )
53 or $self->throw_exception( sprintf(
54 'could not determine sequence for column %s.%s, please consider adding a schema-qualified sequence to its column info',
59 push @values, $self->_dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq});
66 my ($self, $function, $sequence) = @_;
68 $self->throw_exception('No sequence to fetch') unless $sequence;
70 my ($val) = $self->_get_dbh->selectrow_array(
71 sprintf ("select %s('%s')", $function, (ref $sequence eq 'SCALAR') ? $$sequence : $sequence)
77 sub _dbh_get_autoinc_seq {
78 my ($self, $dbh, $source, $col) = @_;
81 my $table = $source->name;
83 # deref table name if it needs it
85 if ref $table eq 'SCALAR';
87 # parse out schema name if present
88 if( $table =~ /^(.+)\.(.+)$/ ) {
89 ( $schema, $table ) = ( $1, $2 );
92 # get the column default using a Postgres-specific pg_catalog query
93 my $seq_expr = $self->_dbh_get_column_default( $dbh, $schema, $table, $col );
95 # if no default value is set on the column, or if we can't parse the
96 # default value as a sequence, throw.
97 unless ( defined $seq_expr and $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i ) {
98 $seq_expr = '' unless defined $seq_expr;
99 $schema = "$schema." if defined $schema && length $schema;
100 $self->throw_exception( sprintf (
101 'no sequence found for %s%s.%s, check the RDBMS table definition or explicitly set the '.
102 "'sequence' for this column in %s",
103 $schema ? "$schema." : '',
106 $source->source_name,
113 # custom method for fetching column default, since column_info has a
114 # bug with older versions of DBD::Pg
115 sub _dbh_get_column_default {
116 my ( $self, $dbh, $schema, $table, $col ) = @_;
118 # Build and execute a query into the pg_catalog to find the Pg
119 # expression for the default value for this column in this table.
120 # If the table name is schema-qualified, query using that specific
123 # Otherwise, find the table in the standard Postgres way, using the
124 # search path. This is done with the pg_catalog.pg_table_is_visible
125 # function, which returns true if a given table is 'visible',
126 # meaning the first table of that name to be found in the search
129 # I *think* we can be assured that this query will always find the
130 # correct column according to standard Postgres semantics.
134 my $sqlmaker = $self->sql_maker;
135 local $sqlmaker->{bindtype} = 'normal';
137 my ($where, @bind) = $sqlmaker->where ({
138 'a.attnum' => {'>', 0},
139 'c.relname' => $table,
141 -not_bool => 'a.attisdropped',
142 (defined $schema && length $schema)
143 ? ( 'n.nspname' => $schema )
144 : ( -bool => \'pg_catalog.pg_table_is_visible(c.oid)' )
147 my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind);
150 (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid)
151 FROM pg_catalog.pg_attrdef d
152 WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef)
153 FROM pg_catalog.pg_class c
154 LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
155 JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid
168 sub bind_attribute_by_data_type {
169 my ($self,$data_type) = @_;
171 if ($self->_is_binary_lob_type($data_type)) {
172 # this is a hot-ish codepath, use an escape flag to minimize
173 # amount of function/method calls
174 # additionally version.pm is cock, and memleaks on multiple
176 # the flag is stored in the DBD namespace, so that Class::Unload
177 # will work (unlikely, but still)
178 unless ($DBD::Pg::__DBIC_DBD_VERSION_CHECK_DONE__) {
179 if ($self->_server_info->{normalized_dbms_version} >= 9.0) {
180 try { DBD::Pg->VERSION('2.17.2'); 1 } or carp (
181 __PACKAGE__.': BYTEA columns are known to not work on Pg >= 9.0 with DBD::Pg < 2.17.2'
184 elsif (not try { DBD::Pg->VERSION('2.9.2'); 1 } ) { carp (
185 __PACKAGE__.': DBD::Pg 2.9.2 or greater is strongly recommended for BYTEA column support'
188 $DBD::Pg::__DBIC_DBD_VERSION_CHECK_DONE__ = 1;
191 return { pg_type => DBD::Pg::PG_BYTEA() };
198 sub _exec_svp_begin {
199 my ($self, $name) = @_;
201 $self->_dbh->pg_savepoint($name);
204 sub _exec_svp_release {
205 my ($self, $name) = @_;
207 $self->_dbh->pg_release($name);
210 sub _exec_svp_rollback {
211 my ($self, $name) = @_;
213 $self->_dbh->pg_rollback_to($name);
216 sub deployment_statements {
218 my ($schema, $type, $version, $dir, $sqltargs, @rest) = @_;
223 ! exists $sqltargs->{producer_args}{postgres_version}
225 my $dver = $self->_server_info->{normalized_dbms_version}
227 $sqltargs->{producer_args}{postgres_version} = $dver;
230 $self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
236 $self->_pg_cursor_number(0);
237 $self->SUPER::_populate_dbh();
240 sub _get_next_pg_cursor_number {
243 my $ret=$self->_pg_cursor_number;
244 $self->_pg_cursor_number($ret+1);
249 my ($self, $dbh, $sql) = @_;
251 DBIx::Class::Storage::DBI::Pg::Sth->new($self,$dbh,$sql);
254 package DBIx::Class::Storage::DBI::Pg::Sth;{
258 __PACKAGE__->mk_group_accessors('simple' =>
260 'cursor_id', 'cursor_created',
261 'cursor_sth', 'fetch_sth',
265 my ($class, $storage, $dbh, $sql) = @_;
267 if ($sql =~ /^SELECT\b/i) {
268 my $self=bless {},$class;
269 $self->storage($storage);
272 $csr_id=$self->_cursor_name_from_number(
273 $storage->_get_next_pg_cursor_number()
275 my $hold= ($sql =~ /\bFOR\s+UPDATE\s*\z/i) ? '' : 'WITH HOLD';
276 $sql="DECLARE $csr_id CURSOR $hold FOR $sql";
277 $self->cursor_id($csr_id);
278 $self->cursor_sth($storage->SUPER::_dbh_sth($dbh,$sql));
279 $self->cursor_created(0);
282 else { # short-circuit
283 return $storage->SUPER::_dbh_sth($dbh,$sql);
287 sub _cursor_name_from_number {
288 return 'dbic_pg_cursor_'.$_[1];
295 $self->fetch_sth->finish() if $self->fetch_sth;
296 $self->fetch_sth(undef);
297 $self->cursor_sth->finish() if $self->cursor_sth;
298 $self->cursor_sth(undef);
299 $self->storage->_dbh_do('CLOSE '.$self->cursor_id);
312 my ($self,@bind_args)=@_;
314 return $self->cursor_sth->bind_param(@bind_args);
318 my ($self,@bind_values)=@_;
320 return $self->cursor_sth->execute(@bind_values);
323 # bind_param_array & execute_array not used for SELECT statements, so
329 return $self->cursor_sth->errstr;
335 $self->fetch_sth->finish if $self->fetch_sth;
336 return $self->cursor_sth->finish;
339 sub _check_cursor_end {
341 if ($self->fetch_sth->rows == 0) {
351 if (!$self->cursor_created) {
352 $self->cursor_sth->execute();
354 $self->fetch_sth->finish if $self->fetch_sth;
355 $self->fetch_sth($self->storage->sth("fetch 1000 from ".$self->cursor_id));
356 $self->fetch_sth->execute;
362 $self->_run_fetch_sth unless $self->fetch_sth;
363 return if $self->_check_cursor_end;
365 my @row = $self->fetch_sth->fetchrow_array;
367 $self->_run_fetch_sth;
368 return if $self->_check_cursor_end;
370 @row = $self->fetch_sth->fetchrow_array;
375 sub fetchall_arrayref {
376 my ($self,$slice,$max_rows) = @_;
379 $self->_run_fetch_sth unless $self->fetch_sth;
380 return if $self->_check_cursor_end;
383 my $batch=$self->fetch_sth->fetchall_arrayref($slice,$max_rows);
386 $self->_run_fetch_sth;
387 last if $self->_check_cursor_end;
391 $max_rows -= @$batch;
392 last if $max_rows <=0;
408 DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL
412 # In your result (table) classes
413 use base 'DBIx::Class::Core';
414 __PACKAGE__->set_primary_key('id');
418 This class implements autoincrements for PostgreSQL.
420 =head1 POSTGRESQL SCHEMA SUPPORT
422 This driver supports multiple PostgreSQL schemas, with one caveat: for
423 performance reasons, data about the search path, sequence names, and
424 so forth is queried as needed and CACHED for subsequent uses.
426 For this reason, once your schema is instantiated, you should not
427 change the PostgreSQL schema search path for that schema's database
428 connection. If you do, Bad Things may happen.
430 You should do any necessary manipulation of the search path BEFORE
431 instantiating your schema object, or as part of the on_connect_do
432 option to connect(), for example:
434 my $schema = My::Schema->connect
437 [ 'SET search_path TO myschema, foo, public' ],
443 See L<DBIx::Class/CONTRIBUTORS>
447 You may distribute this code under the same terms as Perl itself.