1 package DBIx::Class::Storage::DBI::Pg;
7 DBIx::Class::Storage::DBI::MultiColumnIn
11 use DBD::Pg qw(:pg_types);
13 use Context::Preserve ();
15 # Ask for a DBD::Pg with array support
16 warn __PACKAGE__.": DBD::Pg 2.9.2 or greater is strongly recommended\n"
17 if ($DBD::Pg::VERSION < 2.009002); # pg uses (used?) version::qv()
19 sub _supports_insert_returning {
23 if $self->_server_info->{normalized_dbms_version} >= 8.002;
28 sub with_deferred_fk_checks {
29 my ($self, $sub) = @_;
31 my $txn_scope_guard = $self->txn_scope_guard;
33 $self->_do_query('SET CONSTRAINTS ALL DEFERRED');
35 my $sg = Scope::Guard->new(sub {
36 $self->_do_query('SET CONSTRAINTS ALL IMMEDIATE');
39 return Context::Preserve::preserve_context(sub { $sub->() },
40 after => sub { $txn_scope_guard->commit });
43 # only used when INSERT ... RETURNING is disabled
45 my ($self,$source,@cols) = @_;
50 my $seq = ( $source->column_info($col)->{sequence} ||= $self->dbh_do('_dbh_get_autoinc_seq', $source, $col) )
51 or $self->throw_exception( sprintf(
52 'could not determine sequence for column %s.%s, please consider adding a schema-qualified sequence to its column info',
57 push @values, $self->_dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq});
64 my ($self, $function, $sequence) = @_;
66 $self->throw_exception('No sequence to fetch') unless $sequence;
68 my ($val) = $self->_get_dbh->selectrow_array(
69 sprintf ("select %s('%s')", $function, $sequence)
75 sub _dbh_get_autoinc_seq {
76 my ($self, $dbh, $source, $col) = @_;
79 my $table = $source->name;
81 # deref table name if it needs it
83 if ref $table eq 'SCALAR';
85 # parse out schema name if present
86 if( $table =~ /^(.+)\.(.+)$/ ) {
87 ( $schema, $table ) = ( $1, $2 );
90 # get the column default using a Postgres-specific pg_catalog query
91 my $seq_expr = $self->_dbh_get_column_default( $dbh, $schema, $table, $col );
93 # if no default value is set on the column, or if we can't parse the
94 # default value as a sequence, throw.
95 unless ( defined $seq_expr and $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i ) {
96 $seq_expr = '' unless defined $seq_expr;
97 $schema = "$schema." if defined $schema && length $schema;
98 $self->throw_exception( sprintf (
99 'no sequence found for %s%s.%s, check the RDBMS table definition or explicitly set the '.
100 "'sequence' for this column in %s",
101 $schema ? "$schema." : '',
104 $source->source_name,
111 # custom method for fetching column default, since column_info has a
112 # bug with older versions of DBD::Pg
113 sub _dbh_get_column_default {
114 my ( $self, $dbh, $schema, $table, $col ) = @_;
116 # Build and execute a query into the pg_catalog to find the Pg
117 # expression for the default value for this column in this table.
118 # If the table name is schema-qualified, query using that specific
121 # Otherwise, find the table in the standard Postgres way, using the
122 # search path. This is done with the pg_catalog.pg_table_is_visible
123 # function, which returns true if a given table is 'visible',
124 # meaning the first table of that name to be found in the search
127 # I *think* we can be assured that this query will always find the
128 # correct column according to standard Postgres semantics.
132 my $sqlmaker = $self->sql_maker;
133 local $sqlmaker->{bindtype} = 'normal';
135 my ($where, @bind) = $sqlmaker->where ({
136 'a.attnum' => {'>', 0},
137 'c.relname' => $table,
139 -not_bool => 'a.attisdropped',
140 (defined $schema && length $schema)
141 ? ( 'n.nspname' => $schema )
142 : ( -bool => \'pg_catalog.pg_table_is_visible(c.oid)' )
145 my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind);
148 (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid)
149 FROM pg_catalog.pg_attrdef d
150 WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef)
151 FROM pg_catalog.pg_class c
152 LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
153 JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid
166 sub datetime_parser_type { return "DateTime::Format::Pg"; }
168 sub bind_attribute_by_data_type {
169 my ($self,$data_type) = @_;
171 my $bind_attributes = {
172 bytea => { pg_type => DBD::Pg::PG_BYTEA },
173 blob => { pg_type => DBD::Pg::PG_BYTEA },
176 if( defined $bind_attributes->{$data_type} ) {
177 return $bind_attributes->{$data_type};
185 my ($self, $name) = @_;
187 $self->_get_dbh->pg_savepoint($name);
191 my ($self, $name) = @_;
193 $self->_get_dbh->pg_release($name);
197 my ($self, $name) = @_;
199 $self->_get_dbh->pg_rollback_to($name);
208 DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL
212 # In your result (table) classes
213 use base 'DBIx::Class::Core';
214 __PACKAGE__->set_primary_key('id');
215 __PACKAGE__->sequence('mysequence');
219 This class implements autoincrements for PostgreSQL.
221 =head1 POSTGRESQL SCHEMA SUPPORT
223 This driver supports multiple PostgreSQL schemas, with one caveat: for
224 performance reasons, data about the search path, sequence names, and
225 so forth is queried as needed and CACHED for subsequent uses.
227 For this reason, once your schema is instantiated, you should not
228 change the PostgreSQL schema search path for that schema's database
229 connection. If you do, Bad Things may happen.
231 You should do any necessary manipulation of the search path BEFORE
232 instantiating your schema object, or as part of the on_connect_do
233 option to connect(), for example:
235 my $schema = My::Schema->connect
238 [ 'SET search_path TO myschema, foo, public' ],
244 See L<DBIx::Class/CONTRIBUTORS>
248 You may distribute this code under the same terms as Perl itself.