1 package DBIx::Class::Schema;
6 use DBIx::Class::Exception;
7 use Carp::Clan qw/^DBIx::Class/;
8 use Scalar::Util qw/weaken/;
13 use base qw/DBIx::Class/;
15 __PACKAGE__->mk_classdata('class_mappings' => {});
16 __PACKAGE__->mk_classdata('source_registrations' => {});
17 __PACKAGE__->mk_classdata('storage_type' => '::DBI');
18 __PACKAGE__->mk_classdata('storage');
19 __PACKAGE__->mk_classdata('exception_action');
20 __PACKAGE__->mk_classdata('stacktrace' => $ENV{DBIC_TRACE} || 0);
21 __PACKAGE__->mk_classdata('default_resultset_attributes' => {});
25 DBIx::Class::Schema - composable schemas
29 package Library::Schema;
30 use base qw/DBIx::Class::Schema/;
32 # load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD
33 __PACKAGE__->load_classes(qw/CD Book DVD/);
35 package Library::Schema::CD;
36 use base qw/DBIx::Class/;
37 __PACKAGE__->load_components(qw/PK::Auto Core/); # for example
38 __PACKAGE__->table('cd');
40 # Elsewhere in your code:
41 my $schema1 = Library::Schema->connect(
48 my $schema2 = Library::Schema->connect($coderef_returning_dbh);
50 # fetch objects using Library::Schema::DVD
51 my $resultset = $schema1->resultset('DVD')->search( ... );
52 my @dvd_objects = $schema2->resultset('DVD')->search( ... );
56 Creates database classes based on a schema. This is the recommended way to
57 use L<DBIx::Class> and allows you to use more than one concurrent connection
60 NB: If you're used to L<Class::DBI> it's worth reading the L</SYNOPSIS>
61 carefully, as DBIx::Class does things a little differently. Note in
62 particular which module inherits off which.
70 =item Arguments: $moniker, $component_class
74 Registers a class which isa DBIx::Class::ResultSourceProxy. Equivalent to
77 $schema->register_source($moniker, $component_class->result_source_instance);
82 my ($self, $moniker, $to_register) = @_;
83 $self->register_source($moniker => $to_register->result_source_instance);
86 =head2 register_source
90 =item Arguments: $moniker, $result_source
94 Registers the L<DBIx::Class::ResultSource> in the schema with the given
102 $self->_register_source(@_);
105 =head2 register_extra_source
109 =item Arguments: $moniker, $result_source
113 As L</register_source> but should be used if the result class already
114 has a source and you want to register an extra one.
118 sub register_extra_source {
121 $self->_register_source(@_, { extra => 1 });
124 sub _register_source {
125 my ($self, $moniker, $source, $params) = @_;
127 %$source = %{ $source->new( { %$source, source_name => $moniker }) };
129 my %reg = %{$self->source_registrations};
130 $reg{$moniker} = $source;
131 $self->source_registrations(\%reg);
133 $source->schema($self);
134 weaken($source->{schema}) if ref($self);
135 return if ($params->{extra});
137 if ($source->result_class) {
138 my %map = %{$self->class_mappings};
139 if (exists $map{$source->result_class}) {
140 warn $source->result_class . ' already has a source, use register_extra_source for additional sources';
142 $map{$source->result_class} = $moniker;
143 $self->class_mappings(\%map);
147 sub _unregister_source {
148 my ($self, $moniker) = @_;
149 my %reg = %{$self->source_registrations};
151 my $source = delete $reg{$moniker};
152 $self->source_registrations(\%reg);
153 if ($source->result_class) {
154 my %map = %{$self->class_mappings};
155 delete $map{$source->result_class};
156 $self->class_mappings(\%map);
164 =item Arguments: $moniker
166 =item Return Value: $classname
170 Retrieves the result class name for the given moniker. For example:
172 my $class = $schema->class('CD');
177 my ($self, $moniker) = @_;
178 return $self->source($moniker)->result_class;
185 =item Arguments: $moniker
187 =item Return Value: $result_source
191 my $source = $schema->source('Book');
193 Returns the L<DBIx::Class::ResultSource> object for the registered moniker.
198 my ($self, $moniker) = @_;
199 my $sreg = $self->source_registrations;
200 return $sreg->{$moniker} if exists $sreg->{$moniker};
202 # if we got here, they probably passed a full class name
203 my $mapped = $self->class_mappings->{$moniker};
204 $self->throw_exception("Can't find source for ${moniker}")
205 unless $mapped && exists $sreg->{$mapped};
206 return $sreg->{$mapped};
213 =item Return Value: @source_monikers
217 Returns the source monikers of all source registrations on this schema.
220 my @source_monikers = $schema->sources;
224 sub sources { return keys %{shift->source_registrations}; }
228 my $storage = $schema->storage;
230 Returns the L<DBIx::Class::Storage> object for this Schema.
236 =item Arguments: $moniker
238 =item Return Value: $result_set
242 my $rs = $schema->resultset('DVD');
244 Returns the L<DBIx::Class::ResultSet> object for the registered moniker.
249 my ($self, $moniker) = @_;
250 return $self->source($moniker)->resultset;
257 =item Arguments: @classes?, { $namespace => [ @classes ] }+
261 With no arguments, this method uses L<Module::Find> to find all classes under
262 the schema's namespace. Otherwise, this method loads the classes you specify
263 (using L<use>), and registers them (using L</"register_class">).
265 It is possible to comment out classes with a leading C<#>, but note that perl
266 will think it's a mistake (trying to use a comment in a qw list), so you'll
267 need to add C<no warnings 'qw';> before your load_classes call.
271 My::Schema->load_classes(); # loads My::Schema::CD, My::Schema::Artist,
272 # etc. (anything under the My::Schema namespace)
274 # loads My::Schema::CD, My::Schema::Artist, Other::Namespace::Producer but
275 # not Other::Namespace::LinerNotes nor My::Schema::Track
276 My::Schema->load_classes(qw/ CD Artist #Track /, {
277 Other::Namespace => [qw/ Producer #LinerNotes /],
283 my ($class, @params) = @_;
288 foreach my $param (@params) {
289 if (ref $param eq 'ARRAY') {
290 # filter out commented entries
291 my @modules = grep { $_ !~ /^#/ } @$param;
293 push (@{$comps_for{$class}}, @modules);
295 elsif (ref $param eq 'HASH') {
296 # more than one namespace possible
297 for my $comp ( keys %$param ) {
298 # filter out commented entries
299 my @modules = grep { $_ !~ /^#/ } @{$param->{$comp}};
301 push (@{$comps_for{$comp}}, @modules);
305 # filter out commented entries
306 push (@{$comps_for{$class}}, $param) if $param !~ /^#/;
310 my @comp = map { substr $_, length "${class}::" }
311 Module::Find::findallmod($class);
312 $comps_for{$class} = \@comp;
317 no warnings qw/redefine/;
318 local *Class::C3::reinitialize = sub { };
319 foreach my $prefix (keys %comps_for) {
320 foreach my $comp (@{$comps_for{$prefix}||[]}) {
321 my $comp_class = "${prefix}::${comp}";
322 { # try to untaint module name. mods where this fails
323 # are left alone so we don't have to change the old behavior
324 no locale; # localized \w doesn't untaint expression
325 if ( $comp_class =~ m/^( (?:\w+::)* \w+ )$/x ) {
329 $class->ensure_class_loaded($comp_class);
331 $comp = $comp_class->source_name || $comp;
333 push(@to_register, [ $comp, $comp_class ]);
337 Class::C3->reinitialize;
339 foreach my $to (@to_register) {
340 $class->register_class(@$to);
341 # if $class->can('result_source_instance');
345 =head2 load_namespaces
349 =item Arguments: %options?
353 This is an alternative to L</load_classes> above which assumes an alternative
354 layout for automatic class loading. It assumes that all result
355 classes are underneath a sub-namespace of the schema called C<Result>, any
356 corresponding ResultSet classes are underneath a sub-namespace of the schema
359 Both of the sub-namespaces are configurable if you don't like the defaults,
360 via the options C<result_namespace> and C<resultset_namespace>.
362 If (and only if) you specify the option C<default_resultset_class>, any found
363 Result classes for which we do not find a corresponding
364 ResultSet class will have their C<resultset_class> set to
365 C<default_resultset_class>.
367 C<load_namespaces> takes care of calling C<resultset_class> for you where
368 neccessary if you didn't do it for yourself.
370 All of the namespace and classname options to this method are relative to
371 the schema classname by default. To specify a fully-qualified name, prefix
372 it with a literal C<+>.
376 # load My::Schema::Result::CD, My::Schema::Result::Artist,
377 # My::Schema::ResultSet::CD, etc...
378 My::Schema->load_namespaces;
380 # Override everything to use ugly names.
381 # In this example, if there is a My::Schema::Res::Foo, but no matching
382 # My::Schema::RSets::Foo, then Foo will have its
383 # resultset_class set to My::Schema::RSetBase
384 My::Schema->load_namespaces(
385 result_namespace => 'Res',
386 resultset_namespace => 'RSets',
387 default_resultset_class => 'RSetBase',
390 # Put things in other namespaces
391 My::Schema->load_namespaces(
392 result_namespace => '+Some::Place::Results',
393 resultset_namespace => '+Another::Place::RSets',
396 If you'd like to use multiple namespaces of each type, simply use an arrayref
397 of namespaces for that option. In the case that the same result
398 (or resultset) class exists in multiple namespaces, the latter entries in
399 your list of namespaces will override earlier ones.
401 My::Schema->load_namespaces(
402 # My::Schema::Results_C::Foo takes precedence over My::Schema::Results_B::Foo :
403 result_namespace => [ 'Results_A', 'Results_B', 'Results_C' ],
404 resultset_namespace => [ '+Some::Place::RSets', 'RSets' ],
409 # Pre-pends our classname to the given relative classname or
410 # class namespace, unless there is a '+' prefix, which will
412 sub _expand_relative_name {
413 my ($class, $name) = @_;
415 $name = $class . '::' . $name if ! ($name =~ s/^\+//);
419 # returns a hash of $shortname => $fullname for every package
420 # found in the given namespaces ($shortname is with the $fullname's
421 # namespace stripped off)
422 sub _map_namespaces {
423 my ($class, @namespaces) = @_;
426 foreach my $namespace (@namespaces) {
429 map { (substr($_, length "${namespace}::"), $_) }
430 Module::Find::findallmod($namespace)
437 sub load_namespaces {
438 my ($class, %args) = @_;
440 my $result_namespace = delete $args{result_namespace} || 'Result';
441 my $resultset_namespace = delete $args{resultset_namespace} || 'ResultSet';
442 my $default_resultset_class = delete $args{default_resultset_class};
444 $class->throw_exception('load_namespaces: unknown option(s): '
445 . join(q{,}, map { qq{'$_'} } keys %args))
446 if scalar keys %args;
448 $default_resultset_class
449 = $class->_expand_relative_name($default_resultset_class);
451 for my $arg ($result_namespace, $resultset_namespace) {
452 $arg = [ $arg ] if !ref($arg) && $arg;
454 $class->throw_exception('load_namespaces: namespace arguments must be '
455 . 'a simple string or an arrayref')
456 if ref($arg) ne 'ARRAY';
458 $_ = $class->_expand_relative_name($_) for (@$arg);
461 my %results = $class->_map_namespaces(@$result_namespace);
462 my %resultsets = $class->_map_namespaces(@$resultset_namespace);
466 no warnings 'redefine';
467 local *Class::C3::reinitialize = sub { };
468 use warnings 'redefine';
470 foreach my $result (keys %results) {
471 my $result_class = $results{$result};
472 $class->ensure_class_loaded($result_class);
473 $result_class->source_name($result) unless $result_class->source_name;
475 my $rs_class = delete $resultsets{$result};
476 my $rs_set = $result_class->resultset_class;
477 if($rs_set && $rs_set ne 'DBIx::Class::ResultSet') {
478 if($rs_class && $rs_class ne $rs_set) {
479 warn "We found ResultSet class '$rs_class' for '$result', but it seems "
480 . "that you had already set '$result' to use '$rs_set' instead";
483 elsif($rs_class ||= $default_resultset_class) {
484 $class->ensure_class_loaded($rs_class);
485 $result_class->resultset_class($rs_class);
488 push(@to_register, [ $result_class->source_name, $result_class ]);
492 foreach (sort keys %resultsets) {
493 warn "load_namespaces found ResultSet class $_ with no "
494 . 'corresponding Result class';
497 Class::C3->reinitialize;
498 $class->register_class(@$_) for (@to_register);
503 =head2 compose_connection (DEPRECATED)
507 =item Arguments: $target_namespace, @db_info
509 =item Return Value: $new_schema
513 DEPRECATED. You probably wanted compose_namespace.
515 Actually, you probably just wanted to call connect.
519 (hidden due to deprecation)
521 Calls L<DBIx::Class::Schema/"compose_namespace"> to the target namespace,
522 calls L<DBIx::Class::Schema/connection> with @db_info on the new schema,
523 then injects the L<DBix::Class::ResultSetProxy> component and a
524 resultset_instance classdata entry on all the new classes, in order to support
525 $target_namespaces::$class->search(...) method calls.
527 This is primarily useful when you have a specific need for class method access
528 to a connection. In normal usage it is preferred to call
529 L<DBIx::Class::Schema/connect> and use the resulting schema object to operate
530 on L<DBIx::Class::ResultSet> objects with L<DBIx::Class::Schema/resultset> for
540 sub compose_connection {
541 my ($self, $target, @info) = @_;
543 warn "compose_connection deprecated as of 0.08000"
544 unless ($INC{"DBIx/Class/CDBICompat.pm"} || $warn++);
546 my $base = 'DBIx::Class::ResultSetProxy';
547 eval "require ${base};";
548 $self->throw_exception
549 ("No arguments to load_classes and couldn't load ${base} ($@)")
552 if ($self eq $target) {
553 # Pathological case, largely caused by the docs on early C::M::DBIC::Plain
554 foreach my $moniker ($self->sources) {
555 my $source = $self->source($moniker);
556 my $class = $source->result_class;
557 $self->inject_base($class, $base);
558 $class->mk_classdata(resultset_instance => $source->resultset);
559 $class->mk_classdata(class_resolver => $self);
561 $self->connection(@info);
565 my $schema = $self->compose_namespace($target, $base);
568 my $name = join '::', $target, 'schema';
569 *$name = Sub::Name::subname $name, sub { $schema };
572 $schema->connection(@info);
573 foreach my $moniker ($schema->sources) {
574 my $source = $schema->source($moniker);
575 my $class = $source->result_class;
576 #warn "$moniker $class $source ".$source->storage;
577 $class->mk_classdata(result_source_instance => $source);
578 $class->mk_classdata(resultset_instance => $source->resultset);
579 $class->mk_classdata(class_resolver => $schema);
585 =head2 compose_namespace
589 =item Arguments: $target_namespace, $additional_base_class?
591 =item Return Value: $new_schema
595 For each L<DBIx::Class::ResultSource> in the schema, this method creates a
596 class in the target namespace (e.g. $target_namespace::CD,
597 $target_namespace::Artist) that inherits from the corresponding classes
598 attached to the current schema.
600 It also attaches a corresponding L<DBIx::Class::ResultSource> object to the
601 new $schema object. If C<$additional_base_class> is given, the new composed
602 classes will inherit from first the corresponding classe from the current
603 schema then the base class.
605 For example, for a schema with My::Schema::CD and My::Schema::Artist classes,
607 $schema->compose_namespace('My::DB', 'Base::Class');
608 print join (', ', @My::DB::CD::ISA) . "\n";
609 print join (', ', @My::DB::Artist::ISA) ."\n";
611 will produce the output
613 My::Schema::CD, Base::Class
614 My::Schema::Artist, Base::Class
618 sub compose_namespace {
619 my ($self, $target, $base) = @_;
621 $self = $self->clone;
622 foreach my $moniker ($self->sources) {
623 my $source = $self->source($moniker);
624 my $source_class = ref $source;
625 my $source_copy = $source_class->new({
627 _relationships => Storable::dclone( $source->_relationships ),
630 my $target_class = "${target}::${moniker}";
632 $target_class => $source_copy->result_class, ($base ? $base : ())
634 $source_copy->result_class($target_class);
635 $self->register_source($moniker, $source_copy);
640 sub setup_connection_class {
641 my ($class, $target, @info) = @_;
642 $class->inject_base($target => 'DBIx::Class::DB');
643 #$target->load_components('DB');
644 $target->connection(@info);
651 =item Arguments: $storage_type|{$storage_type, \%args}
653 =item Return Value: $storage_type|{$storage_type, \%args}
657 Set the storage class that will be instantiated when L</connect> is called.
658 If the classname starts with C<::>, the prefix C<DBIx::Class::Storage> is
659 assumed by L</connect>. Defaults to C<::DBI>,
660 which is L<DBIx::Class::Storage::DBI>.
662 You want to use this to hardcoded subclasses of L<DBIx::Class::Storage::DBI>
663 in cases where the appropriate subclass is not autodetected, such as when
664 dealing with MSSQL via L<DBD::Sybase>, in which case you'd set it to
665 C<::DBI::Sybase::MSSQL>.
667 If your storage type requires instantiation arguments, those are defined as a
668 second argument in the form of a hashref and the entire value needs to be
669 wrapped into an arrayref or a hashref. We support both types of refs here in
670 order to play nice with your Config::[class] or your choice.
672 See L<DBIx::Class::Storage::DBI::Replicated> for an example of this.
678 =item Arguments: @args
680 =item Return Value: $new_schema
684 Instantiates a new Storage object of type
685 L<DBIx::Class::Schema/"storage_type"> and passes the arguments to
686 $storage->connect_info. Sets the connection in-place on the schema.
688 See L<DBIx::Class::Storage::DBI/"connect_info"> for DBI-specific syntax,
689 or L<DBIx::Class::Storage> in general.
694 my ($self, @info) = @_;
695 return $self if !@info && $self->storage;
697 my ($storage_class, $args) = ref $self->storage_type ?
698 ($self->_normalize_storage_type($self->storage_type),{}) : ($self->storage_type, {});
700 $storage_class = 'DBIx::Class::Storage'.$storage_class
701 if $storage_class =~ m/^::/;
702 eval "require ${storage_class};";
703 $self->throw_exception(
704 "No arguments to load_classes and couldn't load ${storage_class} ($@)"
706 my $storage = $storage_class->new($self=>$args);
707 $storage->connect_info(\@info);
708 $self->storage($storage);
712 sub _normalize_storage_type {
713 my ($self, $storage_type) = @_;
714 if(ref $storage_type eq 'ARRAY') {
715 return @$storage_type;
716 } elsif(ref $storage_type eq 'HASH') {
717 return %$storage_type;
719 $self->throw_exception('Unsupported REFTYPE given: '. ref $storage_type);
727 =item Arguments: @info
729 =item Return Value: $new_schema
733 This is a convenience method. It is equivalent to calling
734 $schema->clone->connection(@info). See L</connection> and L</clone> for more
739 sub connect { shift->clone->connection(@_) }
745 =item Arguments: C<$coderef>, @coderef_args?
747 =item Return Value: The return value of $coderef
751 Executes C<$coderef> with (optional) arguments C<@coderef_args> atomically,
752 returning its result (if any). Equivalent to calling $schema->storage->txn_do.
753 See L<DBIx::Class::Storage/"txn_do"> for more information.
755 This interface is preferred over using the individual methods L</txn_begin>,
756 L</txn_commit>, and L</txn_rollback> below.
763 $self->storage or $self->throw_exception
764 ('txn_do called on $schema without storage');
766 $self->storage->txn_do(@_);
769 =head2 txn_scope_guard (EXPERIMENTAL)
771 Runs C<txn_scope_guard> on the schema's storage. See
772 L<DBIx::Class::Storage/txn_scope_guard>.
776 sub txn_scope_guard {
779 $self->storage or $self->throw_exception
780 ('txn_scope_guard called on $schema without storage');
782 $self->storage->txn_scope_guard(@_);
787 Begins a transaction (does nothing if AutoCommit is off). Equivalent to
788 calling $schema->storage->txn_begin. See
789 L<DBIx::Class::Storage::DBI/"txn_begin"> for more information.
796 $self->storage or $self->throw_exception
797 ('txn_begin called on $schema without storage');
799 $self->storage->txn_begin;
804 Commits the current transaction. Equivalent to calling
805 $schema->storage->txn_commit. See L<DBIx::Class::Storage::DBI/"txn_commit">
806 for more information.
813 $self->storage or $self->throw_exception
814 ('txn_commit called on $schema without storage');
816 $self->storage->txn_commit;
821 Rolls back the current transaction. Equivalent to calling
822 $schema->storage->txn_rollback. See
823 L<DBIx::Class::Storage::DBI/"txn_rollback"> for more information.
830 $self->storage or $self->throw_exception
831 ('txn_rollback called on $schema without storage');
833 $self->storage->txn_rollback;
838 Creates a new savepoint (does nothing outside a transaction).
839 Equivalent to calling $schema->storage->svp_begin. See
840 L<DBIx::Class::Storage::DBI/"svp_begin"> for more information.
845 my ($self, $name) = @_;
847 $self->storage or $self->throw_exception
848 ('svp_begin called on $schema without storage');
850 $self->storage->svp_begin($name);
855 Releases a savepoint (does nothing outside a transaction).
856 Equivalent to calling $schema->storage->svp_release. See
857 L<DBIx::Class::Storage::DBI/"svp_release"> for more information.
862 my ($self, $name) = @_;
864 $self->storage or $self->throw_exception
865 ('svp_release called on $schema without storage');
867 $self->storage->svp_release($name);
872 Rollback to a savepoint (does nothing outside a transaction).
873 Equivalent to calling $schema->storage->svp_rollback. See
874 L<DBIx::Class::Storage::DBI/"svp_rollback"> for more information.
879 my ($self, $name) = @_;
881 $self->storage or $self->throw_exception
882 ('svp_rollback called on $schema without storage');
884 $self->storage->svp_rollback($name);
891 =item Return Value: $new_schema
895 Clones the schema and its associated result_source objects and returns the
902 my $clone = { (ref $self ? %$self : ()) };
903 bless $clone, (ref $self || $self);
905 $clone->class_mappings({ %{$clone->class_mappings} });
906 $clone->source_registrations({ %{$clone->source_registrations} });
907 foreach my $moniker ($self->sources) {
908 my $source = $self->source($moniker);
909 my $new = $source->new($source);
910 # we use extra here as we want to leave the class_mappings as they are
911 # but overwrite the source_registrations entry with the new source
912 $clone->register_extra_source($moniker => $new);
914 $clone->storage->set_schema($clone) if $clone->storage;
922 =item Arguments: $source_name, \@data;
926 Pass this method a resultsource name, and an arrayref of
927 arrayrefs. The arrayrefs should contain a list of column names,
928 followed by one or many sets of matching data for the given columns.
930 In void context, C<insert_bulk> in L<DBIx::Class::Storage::DBI> is used
931 to insert the data, as this is a fast method. However, insert_bulk currently
932 assumes that your datasets all contain the same type of values, using scalar
933 references in a column in one row, and not in another will probably not work.
935 Otherwise, each set of data is inserted into the database using
936 L<DBIx::Class::ResultSet/create>, and a arrayref of the resulting row
941 $schema->populate('Artist', [
942 [ qw/artistid name/ ],
943 [ 1, 'Popular Band' ],
948 Since wantarray context is basically the same as looping over $rs->create(...)
949 you won't see any performance benefits and in this case the method is more for
950 convenience. Void context sends the column information directly to storage
951 using <DBI>s bulk insert method. So the performance will be much better for
952 storages that support this method.
954 Because of this difference in the way void context inserts rows into your
955 database you need to note how this will effect any loaded components that
956 override or augment insert. For example if you are using a component such
957 as L<DBIx::Class::UUIDColumns> to populate your primary keys you MUST use
958 wantarray context if you want the PKs automatically created.
963 my ($self, $name, $data) = @_;
964 my $rs = $self->resultset($name);
965 my @names = @{shift(@$data)};
966 if(defined wantarray) {
968 foreach my $item (@$data) {
970 @create{@names} = @$item;
971 push(@created, $rs->create(\%create));
975 my @results_to_create;
976 foreach my $datum (@$data) {
977 my %result_to_create;
978 foreach my $index (0..$#names) {
979 $result_to_create{$names[$index]} = $$datum[$index];
981 push @results_to_create, \%result_to_create;
983 $rs->populate(\@results_to_create);
986 =head2 exception_action
990 =item Arguments: $code_reference
994 If C<exception_action> is set for this class/object, L</throw_exception>
995 will prefer to call this code reference with the exception as an argument,
996 rather than its normal C<croak> or C<confess> action.
998 Your subroutine should probably just wrap the error in the exception
999 object/class of your choosing and rethrow. If, against all sage advice,
1000 you'd like your C<exception_action> to suppress a particular exception
1001 completely, simply have it return true.
1006 use base qw/DBIx::Class::Schema/;
1007 use My::ExceptionClass;
1008 __PACKAGE__->exception_action(sub { My::ExceptionClass->throw(@_) });
1009 __PACKAGE__->load_classes;
1012 my $schema_obj = My::Schema->connect( .... );
1013 $schema_obj->exception_action(sub { My::ExceptionClass->throw(@_) });
1015 # suppress all exceptions, like a moron:
1016 $schema_obj->exception_action(sub { 1 });
1022 =item Arguments: boolean
1026 Whether L</throw_exception> should include stack trace information.
1027 Defaults to false normally, but defaults to true if C<$ENV{DBIC_TRACE}>
1030 =head2 throw_exception
1034 =item Arguments: $message
1038 Throws an exception. Defaults to using L<Carp::Clan> to report errors from
1039 user's perspective. See L</exception_action> for details on overriding
1040 this method's behavior. If L</stacktrace> is turned on, C<throw_exception>'s
1041 default behavior will provide a detailed stack trace.
1045 sub throw_exception {
1048 DBIx::Class::Exception->throw($_[0], $self->stacktrace)
1049 if !$self->exception_action || !$self->exception_action->(@_);
1056 =item Arguments: $sqlt_args, $dir
1060 Attempts to deploy the schema to the current storage using L<SQL::Translator>.
1062 See L<SQL::Translator/METHODS> for a list of values for C<$sqlt_args>. The most
1063 common value for this would be C<< { add_drop_table => 1, } >> to have the SQL
1064 produced include a DROP TABLE statement for each table created.
1066 Additionally, the DBIx::Class parser accepts a C<sources> parameter as a hash
1067 ref or an array ref, containing a list of source to deploy. If present, then
1068 only the sources listed will get deployed. Furthermore, you can use the
1069 C<add_fk_index> parser parameter to prevent the parser from creating an index for each
1075 my ($self, $sqltargs, $dir) = @_;
1076 $self->throw_exception("Can't deploy without storage") unless $self->storage;
1077 $self->storage->deploy($self, undef, $sqltargs, $dir);
1080 =head2 deployment_statements
1084 =item Arguments: $rdbms_type
1088 Returns the SQL statements used by L</deploy> and L<DBIx::Class::Schema/deploy>.
1089 C<$rdbms_type> provides the DBI database driver name for which the SQL
1090 statements are produced. If not supplied, the type of the current schema storage
1095 sub deployment_statements {
1096 my ($self, $rdbms_type) = @_;
1098 $self->throw_exception("Can't generate deployment statements without a storage")
1099 if not $self->storage;
1101 $self->storage->deployment_statements($self, $rdbms_type);
1104 =head2 create_ddl_dir (EXPERIMENTAL)
1108 =item Arguments: \@databases, $version, $directory, $preversion, $sqlt_args
1112 Creates an SQL file based on the Schema, for each of the specified
1113 database types, in the given directory. Given a previous version number,
1114 this will also create a file containing the ALTER TABLE statements to
1115 transform the previous schema into the current one. Note that these
1116 statements may contain DROP TABLE or DROP COLUMN statements that can
1117 potentially destroy data.
1119 The file names are created using the C<ddl_filename> method below, please
1120 override this method in your schema if you would like a different file
1121 name format. For the ALTER file, the same format is used, replacing
1122 $version in the name with "$preversion-$version".
1124 See L<DBIx::Class::Schema/deploy> for details of $sqlt_args.
1126 If no arguments are passed, then the following default values are used:
1130 =item databases - ['MySQL', 'SQLite', 'PostgreSQL']
1132 =item version - $schema->VERSION
1134 =item directory - './'
1136 =item preversion - <none>
1140 Note that this feature is currently EXPERIMENTAL and may not work correctly
1141 across all databases, or fully handle complex relationships.
1143 WARNING: Please check all SQL files created, before applying them.
1147 sub create_ddl_dir {
1150 $self->throw_exception("Can't create_ddl_dir without storage") unless $self->storage;
1151 $self->storage->create_ddl_dir($self, @_);
1158 =item Arguments: $database-type, $version, $directory, $preversion
1162 my $filename = $table->ddl_filename($type, $version, $dir, $preversion)
1164 This method is called by C<create_ddl_dir> to compose a file name out of
1165 the supplied directory, database type and version number. The default file
1166 name format is: C<$dir$schema-$version-$type.sql>.
1168 You may override this method in your schema if you wish to use a different
1174 my ($self, $type, $version, $dir, $preversion) = @_;
1176 my $filename = ref($self);
1177 $filename =~ s/::/-/g;
1178 $filename = File::Spec->catfile($dir, "$filename-$version-$type.sql");
1179 $filename =~ s/$version/$preversion-$version/ if($preversion);
1184 =head2 sqlt_deploy_hook($sqlt_schema)
1186 An optional sub which you can declare in your own Schema class that will get
1187 passed the L<SQL::Translator::Schema> object when you deploy the schema via
1188 L</create_ddl_dir> or L</deploy>.
1190 For an example of what you can do with this, see
1191 L<DBIx::Class::Manual::Cookbook/Adding Indexes And Functions To Your SQL>.
1195 Provided as the recommened way of thawing schema objects. You can call
1196 C<Storable::thaw> directly if you wish, but the thawed objects will not have a
1197 reference to any schema, so are rather useless
1202 my ($self, $obj) = @_;
1203 local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
1204 return Storable::thaw($obj);
1209 This doesn't actualy do anything more than call L<Storable/freeze>, it is just
1210 provided here for symetry.
1215 return Storable::freeze($_[1]);
1220 Recommeneded way of dcloning objects. This is needed to properly maintain
1221 references to the schema object (which itself is B<not> cloned.)
1226 my ($self, $obj) = @_;
1227 local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
1228 return Storable::dclone($obj);
1231 =head2 schema_version
1233 Returns the current schema class' $VERSION
1237 sub schema_version {
1239 my $class = ref($self)||$self;
1241 # does -not- use $schema->VERSION
1242 # since that varies in results depending on if version.pm is installed, and if
1243 # so the perl or XS versions. If you want this to change, bug the version.pm
1244 # author to make vpp and vxs behave the same.
1249 $version = ${"${class}::VERSION"};
1258 Matt S. Trout <mst@shadowcatsystems.co.uk>
1262 You may distribute this code under the same terms as Perl itself.