1 package DBIx::Class::Schema;
8 use Scalar::Util qw/weaken blessed/;
9 use Sub::Name 'subname';
10 use B 'svref_2object';
11 use Devel::GlobalDestruction;
14 use base qw/DBIx::Class/;
16 __PACKAGE__->mk_classdata('class_mappings' => {});
17 __PACKAGE__->mk_classdata('source_registrations' => {});
18 __PACKAGE__->mk_classdata('storage_type' => '::DBI');
19 __PACKAGE__->mk_classdata('storage');
20 __PACKAGE__->mk_classdata('exception_action');
21 __PACKAGE__->mk_classdata('stacktrace' => $ENV{DBIC_TRACE} || 0);
22 __PACKAGE__->mk_classdata('default_resultset_attributes' => {});
26 DBIx::Class::Schema - composable schemas
30 package Library::Schema;
31 use base qw/DBIx::Class::Schema/;
33 # load all Result classes in Library/Schema/Result/
34 __PACKAGE__->load_namespaces();
36 package Library::Schema::Result::CD;
37 use base qw/DBIx::Class::Core/;
39 __PACKAGE__->load_components(qw/InflateColumn::DateTime/); # for example
40 __PACKAGE__->table('cd');
42 # Elsewhere in your code:
43 my $schema1 = Library::Schema->connect(
50 my $schema2 = Library::Schema->connect($coderef_returning_dbh);
52 # fetch objects using Library::Schema::Result::DVD
53 my $resultset = $schema1->resultset('DVD')->search( ... );
54 my @dvd_objects = $schema2->resultset('DVD')->search( ... );
58 Creates database classes based on a schema. This is the recommended way to
59 use L<DBIx::Class> and allows you to use more than one concurrent connection
62 NB: If you're used to L<Class::DBI> it's worth reading the L</SYNOPSIS>
63 carefully, as DBIx::Class does things a little differently. Note in
64 particular which module inherits off which.
68 =head2 load_namespaces
72 =item Arguments: %options?
76 __PACKAGE__->load_namespaces();
78 __PACKAGE__->load_namespaces(
79 result_namespace => 'Res',
80 resultset_namespace => 'RSet',
81 default_resultset_class => '+MyDB::Othernamespace::RSet',
84 With no arguments, this method uses L<Module::Find> to load all of the
85 Result and ResultSet classes under the namespace of the schema from
86 which it is called. For example, C<My::Schema> will by default find
87 and load Result classes named C<My::Schema::Result::*> and ResultSet
88 classes named C<My::Schema::ResultSet::*>.
90 ResultSet classes are associated with Result class of the same name.
91 For example, C<My::Schema::Result::CD> will get the ResultSet class
92 C<My::Schema::ResultSet::CD> if it is present.
94 Both Result and ResultSet namespaces are configurable via the
95 C<result_namespace> and C<resultset_namespace> options.
97 Another option, C<default_resultset_class> specifies a custom default
98 ResultSet class for Result classes with no corresponding ResultSet.
100 All of the namespace and classname options are by default relative to
101 the schema classname. To specify a fully-qualified name, prefix it
102 with a literal C<+>. For example, C<+Other::NameSpace::Result>.
106 You will be warned if ResultSet classes are discovered for which there
107 are no matching Result classes like this:
109 load_namespaces found ResultSet class $classname with no corresponding Result class
111 If a Result class is found to already have a ResultSet class set using
112 L</resultset_class> to some other class, you will be warned like this:
114 We found ResultSet class '$rs_class' for '$result', but it seems
115 that you had already set '$result' to use '$rs_set' instead
119 # load My::Schema::Result::CD, My::Schema::Result::Artist,
120 # My::Schema::ResultSet::CD, etc...
121 My::Schema->load_namespaces;
123 # Override everything to use ugly names.
124 # In this example, if there is a My::Schema::Res::Foo, but no matching
125 # My::Schema::RSets::Foo, then Foo will have its
126 # resultset_class set to My::Schema::RSetBase
127 My::Schema->load_namespaces(
128 result_namespace => 'Res',
129 resultset_namespace => 'RSets',
130 default_resultset_class => 'RSetBase',
133 # Put things in other namespaces
134 My::Schema->load_namespaces(
135 result_namespace => '+Some::Place::Results',
136 resultset_namespace => '+Another::Place::RSets',
139 To search multiple namespaces for either Result or ResultSet classes,
140 use an arrayref of namespaces for that option. In the case that the
141 same result (or resultset) class exists in multiple namespaces, later
142 entries in the list of namespaces will override earlier ones.
144 My::Schema->load_namespaces(
145 # My::Schema::Results_C::Foo takes precedence over My::Schema::Results_B::Foo :
146 result_namespace => [ 'Results_A', 'Results_B', 'Results_C' ],
147 resultset_namespace => [ '+Some::Place::RSets', 'RSets' ],
152 # Pre-pends our classname to the given relative classname or
153 # class namespace, unless there is a '+' prefix, which will
155 sub _expand_relative_name {
156 my ($class, $name) = @_;
158 $name = $class . '::' . $name if ! ($name =~ s/^\+//);
162 # Finds all modules in the supplied namespace, or if omitted in the
163 # namespace of $class. Untaints all findings as they can be assumed
167 my $ns = shift || ref $proto || $proto;
169 require Module::Find;
172 return map { $_ =~ /(.+)/ } Module::Find::findallmod($ns);
175 # returns a hash of $shortname => $fullname for every package
176 # found in the given namespaces ($shortname is with the $fullname's
177 # namespace stripped off)
178 sub _map_namespaces {
179 my ($class, @namespaces) = @_;
182 foreach my $namespace (@namespaces) {
185 map { (substr($_, length "${namespace}::"), $_) }
186 $class->_findallmod($namespace)
193 # returns the result_source_instance for the passed class/object,
194 # or dies with an informative message (used by load_namespaces)
195 sub _ns_get_rsrc_instance {
197 my $rs_class = ref ($_[0]) || $_[0];
200 $rs_class->result_source_instance
202 $me->throw_exception (
203 "Attempt to load_namespaces() class $rs_class failed - are you sure this is a real Result Class?: $_"
208 sub load_namespaces {
209 my ($class, %args) = @_;
211 my $result_namespace = delete $args{result_namespace} || 'Result';
212 my $resultset_namespace = delete $args{resultset_namespace} || 'ResultSet';
213 my $default_resultset_class = delete $args{default_resultset_class};
215 $class->throw_exception('load_namespaces: unknown option(s): '
216 . join(q{,}, map { qq{'$_'} } keys %args))
217 if scalar keys %args;
219 $default_resultset_class
220 = $class->_expand_relative_name($default_resultset_class);
222 for my $arg ($result_namespace, $resultset_namespace) {
223 $arg = [ $arg ] if !ref($arg) && $arg;
225 $class->throw_exception('load_namespaces: namespace arguments must be '
226 . 'a simple string or an arrayref')
227 if ref($arg) ne 'ARRAY';
229 $_ = $class->_expand_relative_name($_) for (@$arg);
232 my %results = $class->_map_namespaces(@$result_namespace);
233 my %resultsets = $class->_map_namespaces(@$resultset_namespace);
237 no warnings qw/redefine/;
238 local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
239 use warnings qw/redefine/;
241 # ensure classes are loaded and attached in inheritance order
242 for my $res (values %results) {
243 $class->ensure_class_loaded($res);
246 my @subclass_last = sort {
249 scalar @{mro::get_linear_isa( $results{$a} )}
255 scalar @{mro::get_linear_isa( $results{$b} )}
260 foreach my $result (@subclass_last) {
261 my $result_class = $results{$result};
263 my $rs_class = delete $resultsets{$result};
264 my $rs_set = $class->_ns_get_rsrc_instance ($result_class)->resultset_class;
266 if($rs_set && $rs_set ne 'DBIx::Class::ResultSet') {
267 if($rs_class && $rs_class ne $rs_set) {
268 carp "We found ResultSet class '$rs_class' for '$result', but it seems "
269 . "that you had already set '$result' to use '$rs_set' instead";
272 elsif($rs_class ||= $default_resultset_class) {
273 $class->ensure_class_loaded($rs_class);
274 if(!$rs_class->isa("DBIx::Class::ResultSet")) {
275 carp "load_namespaces found ResultSet class $rs_class that does not subclass DBIx::Class::ResultSet";
278 $class->_ns_get_rsrc_instance ($result_class)->resultset_class($rs_class);
281 my $source_name = $class->_ns_get_rsrc_instance ($result_class)->source_name || $result;
283 push(@to_register, [ $source_name, $result_class ]);
287 foreach (sort keys %resultsets) {
288 carp "load_namespaces found ResultSet class $_ with no "
289 . 'corresponding Result class';
292 Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
294 $class->register_class(@$_) for (@to_register);
303 =item Arguments: @classes?, { $namespace => [ @classes ] }+
307 L</load_classes> is an alternative method to L</load_namespaces>, both of
308 which serve similar purposes, each with different advantages and disadvantages.
309 In the general case you should use L</load_namespaces>, unless you need to
310 be able to specify that only specific classes are loaded at runtime.
312 With no arguments, this method uses L<Module::Find> to find all classes under
313 the schema's namespace. Otherwise, this method loads the classes you specify
314 (using L<use>), and registers them (using L</"register_class">).
316 It is possible to comment out classes with a leading C<#>, but note that perl
317 will think it's a mistake (trying to use a comment in a qw list), so you'll
318 need to add C<no warnings 'qw';> before your load_classes call.
320 If any classes found do not appear to be Result class files, you will
321 get the following warning:
323 Failed to load $comp_class. Can't find source_name method. Is
324 $comp_class really a full DBIC result class? Fix it, move it elsewhere,
325 or make your load_classes call more specific.
329 My::Schema->load_classes(); # loads My::Schema::CD, My::Schema::Artist,
330 # etc. (anything under the My::Schema namespace)
332 # loads My::Schema::CD, My::Schema::Artist, Other::Namespace::Producer but
333 # not Other::Namespace::LinerNotes nor My::Schema::Track
334 My::Schema->load_classes(qw/ CD Artist #Track /, {
335 Other::Namespace => [qw/ Producer #LinerNotes /],
341 my ($class, @params) = @_;
346 foreach my $param (@params) {
347 if (ref $param eq 'ARRAY') {
348 # filter out commented entries
349 my @modules = grep { $_ !~ /^#/ } @$param;
351 push (@{$comps_for{$class}}, @modules);
353 elsif (ref $param eq 'HASH') {
354 # more than one namespace possible
355 for my $comp ( keys %$param ) {
356 # filter out commented entries
357 my @modules = grep { $_ !~ /^#/ } @{$param->{$comp}};
359 push (@{$comps_for{$comp}}, @modules);
363 # filter out commented entries
364 push (@{$comps_for{$class}}, $param) if $param !~ /^#/;
368 my @comp = map { substr $_, length "${class}::" }
370 $comps_for{$class} = \@comp;
375 no warnings qw/redefine/;
376 local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
377 use warnings qw/redefine/;
379 foreach my $prefix (keys %comps_for) {
380 foreach my $comp (@{$comps_for{$prefix}||[]}) {
381 my $comp_class = "${prefix}::${comp}";
382 $class->ensure_class_loaded($comp_class);
384 my $snsub = $comp_class->can('source_name');
386 carp "Failed to load $comp_class. Can't find source_name method. Is $comp_class really a full DBIC result class? Fix it, move it elsewhere, or make your load_classes call more specific.";
389 $comp = $snsub->($comp_class) || $comp;
391 push(@to_register, [ $comp, $comp_class ]);
395 Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
397 foreach my $to (@to_register) {
398 $class->register_class(@$to);
406 =item Arguments: $storage_type|{$storage_type, \%args}
408 =item Return Value: $storage_type|{$storage_type, \%args}
410 =item Default value: DBIx::Class::Storage::DBI
414 Set the storage class that will be instantiated when L</connect> is called.
415 If the classname starts with C<::>, the prefix C<DBIx::Class::Storage> is
416 assumed by L</connect>.
418 You want to use this to set subclasses of L<DBIx::Class::Storage::DBI>
419 in cases where the appropriate subclass is not autodetected.
421 If your storage type requires instantiation arguments, those are
422 defined as a second argument in the form of a hashref and the entire
423 value needs to be wrapped into an arrayref or a hashref. We support
424 both types of refs here in order to play nice with your
425 Config::[class] or your choice. See
426 L<DBIx::Class::Storage::DBI::Replicated> for an example of this.
428 =head2 exception_action
432 =item Arguments: $code_reference
434 =item Return Value: $code_reference
436 =item Default value: None
440 When L</throw_exception> is invoked and L</exception_action> is set to a code
441 reference, this reference will be called instead of
442 L<DBIx::Class::Exception/throw>, with the exception message passed as the only
445 Your custom throw code B<must> rethrow the exception, as L</throw_exception> is
446 an integral part of DBIC's internal execution control flow.
451 use base qw/DBIx::Class::Schema/;
452 use My::ExceptionClass;
453 __PACKAGE__->exception_action(sub { My::ExceptionClass->throw(@_) });
454 __PACKAGE__->load_classes;
457 my $schema_obj = My::Schema->connect( .... );
458 $schema_obj->exception_action(sub { My::ExceptionClass->throw(@_) });
464 =item Arguments: boolean
468 Whether L</throw_exception> should include stack trace information.
469 Defaults to false normally, but defaults to true if C<$ENV{DBIC_TRACE}>
472 =head2 sqlt_deploy_hook
476 =item Arguments: $sqlt_schema
480 An optional sub which you can declare in your own Schema class that will get
481 passed the L<SQL::Translator::Schema> object when you deploy the schema via
482 L</create_ddl_dir> or L</deploy>.
484 For an example of what you can do with this, see
485 L<DBIx::Class::Manual::Cookbook/Adding Indexes And Functions To Your SQL>.
487 Note that sqlt_deploy_hook is called by L</deployment_statements>, which in turn
488 is called before L</deploy>. Therefore the hook can be used only to manipulate
489 the L<SQL::Translator::Schema> object before it is turned into SQL fed to the
490 database. If you want to execute post-deploy statements which can not be generated
491 by L<SQL::Translator>, the currently suggested method is to overload L</deploy>
492 and use L<dbh_do|DBIx::Class::Storage::DBI/dbh_do>.
500 =item Arguments: @connectinfo
502 =item Return Value: $new_schema
506 Creates and returns a new Schema object. The connection info set on it
507 is used to create a new instance of the storage backend and set it on
510 See L<DBIx::Class::Storage::DBI/"connect_info"> for DBI-specific
511 syntax on the C<@connectinfo> argument, or L<DBIx::Class::Storage> in
514 Note that C<connect_info> expects an arrayref of arguments, but
515 C<connect> does not. C<connect> wraps its arguments in an arrayref
516 before passing them to C<connect_info>.
520 C<connect> is a convenience method. It is equivalent to calling
521 $schema->clone->connection(@connectinfo). To write your own overloaded
522 version, overload L</connection> instead.
526 sub connect { shift->clone->connection(@_) }
532 =item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>
534 =item Return Value: L<$resultset|DBIx::Class::ResultSet>
538 my $rs = $schema->resultset('DVD');
540 Returns the L<DBIx::Class::ResultSet> object for the registered source
546 my ($self, $source_name) = @_;
547 $self->throw_exception('resultset() expects a source name')
548 unless defined $source_name;
549 return $self->source($source_name)->resultset;
556 =item Return Value: L<@source_names|DBIx::Class::ResultSource/source_name>
560 my @source_names = $schema->sources;
562 Lists names of all the sources registered on this Schema object.
566 sub sources { return keys %{shift->source_registrations}; }
572 =item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>
574 =item Return Value: L<$result_source|DBIx::Class::ResultSource>
578 my $source = $schema->source('Book');
580 Returns the L<DBIx::Class::ResultSource> object for the registered
588 $self->throw_exception("source() expects a source name")
591 my $source_name = shift;
593 my $sreg = $self->source_registrations;
594 return $sreg->{$source_name} if exists $sreg->{$source_name};
596 # if we got here, they probably passed a full class name
597 my $mapped = $self->class_mappings->{$source_name};
598 $self->throw_exception("Can't find source for ${source_name}")
599 unless $mapped && exists $sreg->{$mapped};
600 return $sreg->{$mapped};
607 =item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>
609 =item Return Value: $classname
613 my $class = $schema->class('CD');
615 Retrieves the Result class name for the given source name.
620 return shift->source(shift)->result_class;
627 =item Arguments: C<$coderef>, @coderef_args?
629 =item Return Value: The return value of $coderef
633 Executes C<$coderef> with (optional) arguments C<@coderef_args> atomically,
634 returning its result (if any). Equivalent to calling $schema->storage->txn_do.
635 See L<DBIx::Class::Storage/"txn_do"> for more information.
637 This interface is preferred over using the individual methods L</txn_begin>,
638 L</txn_commit>, and L</txn_rollback> below.
640 WARNING: If you are connected with C<< AutoCommit => 0 >> the transaction is
641 considered nested, and you will still need to call L</txn_commit> to write your
642 changes when appropriate. You will also want to connect with C<< auto_savepoint =>
643 1 >> to get partial rollback to work, if the storage driver for your database
646 Connecting with C<< AutoCommit => 1 >> is recommended.
653 $self->storage or $self->throw_exception
654 ('txn_do called on $schema without storage');
656 $self->storage->txn_do(@_);
659 =head2 txn_scope_guard
661 Runs C<txn_scope_guard> on the schema's storage. See
662 L<DBIx::Class::Storage/txn_scope_guard>.
666 sub txn_scope_guard {
669 $self->storage or $self->throw_exception
670 ('txn_scope_guard called on $schema without storage');
672 $self->storage->txn_scope_guard(@_);
677 Begins a transaction (does nothing if AutoCommit is off). Equivalent to
678 calling $schema->storage->txn_begin. See
679 L<DBIx::Class::Storage/"txn_begin"> for more information.
686 $self->storage or $self->throw_exception
687 ('txn_begin called on $schema without storage');
689 $self->storage->txn_begin;
694 Commits the current transaction. Equivalent to calling
695 $schema->storage->txn_commit. See L<DBIx::Class::Storage/"txn_commit">
696 for more information.
703 $self->storage or $self->throw_exception
704 ('txn_commit called on $schema without storage');
706 $self->storage->txn_commit;
711 Rolls back the current transaction. Equivalent to calling
712 $schema->storage->txn_rollback. See
713 L<DBIx::Class::Storage/"txn_rollback"> for more information.
720 $self->storage or $self->throw_exception
721 ('txn_rollback called on $schema without storage');
723 $self->storage->txn_rollback;
728 my $storage = $schema->storage;
730 Returns the L<DBIx::Class::Storage> object for this Schema. Grab this
731 if you want to turn on SQL statement debugging at runtime, or set the
732 quote character. For the default storage, the documentation can be
733 found in L<DBIx::Class::Storage::DBI>.
739 =item Arguments: L<$source_name|DBIx::Class::ResultSource/source_name>, [ \@column_list, \@row_values+ ] | [ \%col_data+ ]
741 =item Return Value: L<\@result_objects|DBIx::Class::Manual::ResultClass> (scalar context) | L<@result_objects|DBIx::Class::Manual::ResultClass> (list context)
745 A convenience shortcut to L<DBIx::Class::ResultSet/populate>. Equivalent to:
747 $schema->resultset($source_name)->populate([...]);
753 The context of this method call has an important effect on what is
754 submitted to storage. In void context data is fed directly to fastpath
755 insertion routines provided by the underlying storage (most often
756 L<DBI/execute_for_fetch>), bypassing the L<new|DBIx::Class::Row/new> and
757 L<insert|DBIx::Class::Row/insert> calls on the
758 L<Result|DBIx::Class::Manual::ResultClass> class, including any
759 augmentation of these methods provided by components. For example if you
760 are using something like L<DBIx::Class::UUIDColumns> to create primary
761 keys for you, you will find that your PKs are empty. In this case you
762 will have to explicitly force scalar or list context in order to create
770 my ($self, $name, $data) = @_;
771 my $rs = $self->resultset($name)
772 or $self->throw_exception("'$name' is not a resultset");
774 return $rs->populate($data);
781 =item Arguments: @args
783 =item Return Value: $new_schema
787 Similar to L</connect> except sets the storage object and connection
788 data in-place on the Schema class. You should probably be calling
789 L</connect> to get a proper Schema object instead.
793 Overload C<connection> to change the behaviour of C<connect>.
798 my ($self, @info) = @_;
799 return $self if !@info && $self->storage;
801 my ($storage_class, $args) = ref $self->storage_type ?
802 ($self->_normalize_storage_type($self->storage_type),{}) : ($self->storage_type, {});
804 $storage_class = 'DBIx::Class::Storage'.$storage_class
805 if $storage_class =~ m/^::/;
807 $self->ensure_class_loaded ($storage_class);
810 $self->throw_exception(
811 "Unable to load storage class ${storage_class}: $_"
814 my $storage = $storage_class->new($self=>$args);
815 $storage->connect_info(\@info);
816 $self->storage($storage);
820 sub _normalize_storage_type {
821 my ($self, $storage_type) = @_;
822 if(ref $storage_type eq 'ARRAY') {
823 return @$storage_type;
824 } elsif(ref $storage_type eq 'HASH') {
825 return %$storage_type;
827 $self->throw_exception('Unsupported REFTYPE given: '. ref $storage_type);
831 =head2 compose_namespace
835 =item Arguments: $target_namespace, $additional_base_class?
837 =item Retur Value: $new_schema
841 For each L<DBIx::Class::ResultSource> in the schema, this method creates a
842 class in the target namespace (e.g. $target_namespace::CD,
843 $target_namespace::Artist) that inherits from the corresponding classes
844 attached to the current schema.
846 It also attaches a corresponding L<DBIx::Class::ResultSource> object to the
847 new $schema object. If C<$additional_base_class> is given, the new composed
848 classes will inherit from first the corresponding class from the current
849 schema then the base class.
851 For example, for a schema with My::Schema::CD and My::Schema::Artist classes,
853 $schema->compose_namespace('My::DB', 'Base::Class');
854 print join (', ', @My::DB::CD::ISA) . "\n";
855 print join (', ', @My::DB::Artist::ISA) ."\n";
857 will produce the output
859 My::Schema::CD, Base::Class
860 My::Schema::Artist, Base::Class
864 # this might be oversimplified
865 # sub compose_namespace {
866 # my ($self, $target, $base) = @_;
868 # my $schema = $self->clone;
869 # foreach my $source_name ($schema->sources) {
870 # my $source = $schema->source($source_name);
871 # my $target_class = "${target}::${source_name}";
872 # $self->inject_base(
873 # $target_class => $source->result_class, ($base ? $base : ())
875 # $source->result_class($target_class);
876 # $target_class->result_source_instance($source)
877 # if $target_class->can('result_source_instance');
878 # $schema->register_source($source_name, $source);
883 sub compose_namespace {
884 my ($self, $target, $base) = @_;
886 my $schema = $self->clone;
888 $schema->source_registrations({});
890 # the original class-mappings must remain - otherwise
891 # reverse_relationship_info will not work
892 #$schema->class_mappings({});
895 no warnings qw/redefine/;
896 local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
897 use warnings qw/redefine/;
900 foreach my $source_name ($self->sources) {
901 my $orig_source = $self->source($source_name);
903 my $target_class = "${target}::${source_name}";
904 $self->inject_base($target_class, $orig_source->result_class, ($base || ()) );
906 # register_source examines result_class, and then returns us a clone
907 my $new_source = $schema->register_source($source_name, bless
908 { %$orig_source, result_class => $target_class },
912 if ($target_class->can('result_source_instance')) {
913 # give the class a schema-less source copy
914 $target_class->result_source_instance( bless
915 { %$new_source, schema => ref $new_source->{schema} || $new_source->{schema} },
921 foreach my $meth (qw/class source resultset/) {
922 no warnings 'redefine';
923 *{"${target}::${meth}"} = subname "${target}::${meth}" =>
924 sub { shift->schema->$meth(@_) };
928 Class::C3->reinitialize() if DBIx::Class::_ENV_::OLD_MRO;
933 sub setup_connection_class {
934 my ($class, $target, @info) = @_;
935 $class->inject_base($target => 'DBIx::Class::DB');
936 #$target->load_components('DB');
937 $target->connection(@info);
942 Creates a new savepoint (does nothing outside a transaction).
943 Equivalent to calling $schema->storage->svp_begin. See
944 L<DBIx::Class::Storage/"svp_begin"> for more information.
949 my ($self, $name) = @_;
951 $self->storage or $self->throw_exception
952 ('svp_begin called on $schema without storage');
954 $self->storage->svp_begin($name);
959 Releases a savepoint (does nothing outside a transaction).
960 Equivalent to calling $schema->storage->svp_release. See
961 L<DBIx::Class::Storage/"svp_release"> for more information.
966 my ($self, $name) = @_;
968 $self->storage or $self->throw_exception
969 ('svp_release called on $schema without storage');
971 $self->storage->svp_release($name);
976 Rollback to a savepoint (does nothing outside a transaction).
977 Equivalent to calling $schema->storage->svp_rollback. See
978 L<DBIx::Class::Storage/"svp_rollback"> for more information.
983 my ($self, $name) = @_;
985 $self->storage or $self->throw_exception
986 ('svp_rollback called on $schema without storage');
988 $self->storage->svp_rollback($name);
995 =item Arguments: %attrs?
997 =item Return Value: $new_schema
1001 Clones the schema and its associated result_source objects and returns the
1002 copy. The resulting copy will have the same attributes as the source schema,
1003 except for those attributes explicitly overriden by the provided C<%attrs>.
1011 (ref $self ? %$self : ()),
1012 (@_ == 1 && ref $_[0] eq 'HASH' ? %{ $_[0] } : @_),
1014 bless $clone, (ref $self || $self);
1016 $clone->$_(undef) for qw/class_mappings source_registrations storage/;
1018 $clone->_copy_state_from($self);
1023 # Needed in Schema::Loader - if you refactor, please make a compatibility shim
1025 sub _copy_state_from {
1026 my ($self, $from) = @_;
1028 $self->class_mappings({ %{$from->class_mappings} });
1029 $self->source_registrations({ %{$from->source_registrations} });
1031 foreach my $source_name ($from->sources) {
1032 my $source = $from->source($source_name);
1033 my $new = $source->new($source);
1034 # we use extra here as we want to leave the class_mappings as they are
1035 # but overwrite the source_registrations entry with the new source
1036 $self->register_extra_source($source_name => $new);
1039 if ($from->storage) {
1040 $self->storage($from->storage);
1041 $self->storage->set_schema($self);
1045 =head2 throw_exception
1049 =item Arguments: $message
1053 Throws an exception. Obeys the exemption rules of L<DBIx::Class::Carp> to report
1054 errors from outer-user's perspective. See L</exception_action> for details on overriding
1055 this method's behavior. If L</stacktrace> is turned on, C<throw_exception>'s
1056 default behavior will provide a detailed stack trace.
1060 sub throw_exception {
1063 if (my $act = $self->exception_action) {
1065 DBIx::Class::Exception->throw(
1066 "Invocation of the exception_action handler installed on $self did *not*"
1067 .' result in an exception. DBIx::Class is unable to function without a reliable'
1068 .' exception mechanism, ensure that exception_action does not hide exceptions'
1069 ." (original error: $_[0])"
1074 "The exception_action handler installed on $self returned false instead"
1075 .' of throwing an exception. This behavior has been deprecated, adjust your'
1076 .' handler to always rethrow the supplied error.'
1080 DBIx::Class::Exception->throw($_[0], $self->stacktrace);
1087 =item Arguments: \%sqlt_args, $dir
1091 Attempts to deploy the schema to the current storage using L<SQL::Translator>.
1093 See L<SQL::Translator/METHODS> for a list of values for C<\%sqlt_args>.
1094 The most common value for this would be C<< { add_drop_table => 1 } >>
1095 to have the SQL produced include a C<DROP TABLE> statement for each table
1096 created. For quoting purposes supply C<quote_identifiers>.
1098 Additionally, the DBIx::Class parser accepts a C<sources> parameter as a hash
1099 ref or an array ref, containing a list of source to deploy. If present, then
1100 only the sources listed will get deployed. Furthermore, you can use the
1101 C<add_fk_index> parser parameter to prevent the parser from creating an index for each
1107 my ($self, $sqltargs, $dir) = @_;
1108 $self->throw_exception("Can't deploy without storage") unless $self->storage;
1109 $self->storage->deploy($self, undef, $sqltargs, $dir);
1112 =head2 deployment_statements
1116 =item Arguments: See L<DBIx::Class::Storage::DBI/deployment_statements>
1118 =item Return Value: $listofstatements
1122 A convenient shortcut to
1123 C<< $self->storage->deployment_statements($self, @args) >>.
1124 Returns the SQL statements used by L</deploy> and
1125 L<DBIx::Class::Schema::Storage/deploy>.
1129 sub deployment_statements {
1132 $self->throw_exception("Can't generate deployment statements without a storage")
1133 if not $self->storage;
1135 $self->storage->deployment_statements($self, @_);
1138 =head2 create_ddl_dir
1142 =item Arguments: See L<DBIx::Class::Storage::DBI/create_ddl_dir>
1146 A convenient shortcut to
1147 C<< $self->storage->create_ddl_dir($self, @args) >>.
1149 Creates an SQL file based on the Schema, for each of the specified
1150 database types, in the given directory.
1154 sub create_ddl_dir {
1157 $self->throw_exception("Can't create_ddl_dir without storage") unless $self->storage;
1158 $self->storage->create_ddl_dir($self, @_);
1165 =item Arguments: $database-type, $version, $directory, $preversion
1167 =item Return Value: $normalised_filename
1171 my $filename = $table->ddl_filename($type, $version, $dir, $preversion)
1173 This method is called by C<create_ddl_dir> to compose a file name out of
1174 the supplied directory, database type and version number. The default file
1175 name format is: C<$dir$schema-$version-$type.sql>.
1177 You may override this method in your schema if you wish to use a different
1182 Prior to DBIx::Class version 0.08100 this method had a different signature:
1184 my $filename = $table->ddl_filename($type, $dir, $version, $preversion)
1186 In recent versions variables $dir and $version were reversed in order to
1187 bring the signature in line with other Schema/Storage methods. If you
1188 really need to maintain backward compatibility, you can do the following
1189 in any overriding methods:
1191 ($dir, $version) = ($version, $dir) if ($DBIx::Class::VERSION < 0.08100);
1196 my ($self, $type, $version, $dir, $preversion) = @_;
1200 $version = "$preversion-$version" if $preversion;
1202 my $class = blessed($self) || $self;
1205 return File::Spec->catfile($dir, "$class-$version-$type.sql");
1210 Provided as the recommended way of thawing schema objects. You can call
1211 C<Storable::thaw> directly if you wish, but the thawed objects will not have a
1212 reference to any schema, so are rather useless.
1217 my ($self, $obj) = @_;
1218 local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
1220 return Storable::thaw($obj);
1225 This doesn't actually do anything more than call L<Storable/nfreeze>, it is just
1226 provided here for symmetry.
1232 return Storable::nfreeze($_[1]);
1239 =item Arguments: $object
1241 =item Return Value: dcloned $object
1245 Recommended way of dcloning L<DBIx::Class::Row> and L<DBIx::Class::ResultSet>
1246 objects so their references to the schema object
1247 (which itself is B<not> cloned) are properly maintained.
1252 my ($self, $obj) = @_;
1253 local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
1255 return Storable::dclone($obj);
1258 =head2 schema_version
1260 Returns the current schema class' $VERSION in a normalised way.
1264 sub schema_version {
1266 my $class = ref($self)||$self;
1268 # does -not- use $schema->VERSION
1269 # since that varies in results depending on if version.pm is installed, and if
1270 # so the perl or XS versions. If you want this to change, bug the version.pm
1271 # author to make vpp and vxs behave the same.
1276 $version = ${"${class}::VERSION"};
1282 =head2 register_class
1286 =item Arguments: $source_name, $component_class
1290 This method is called by L</load_namespaces> and L</load_classes> to install the found classes into your Schema. You should be using those instead of this one.
1292 You will only need this method if you have your Result classes in
1293 files which are not named after the packages (or all in the same
1294 file). You may also need it to register classes at runtime.
1296 Registers a class which isa DBIx::Class::ResultSourceProxy. Equivalent to
1299 $schema->register_source($source_name, $component_class->result_source_instance);
1303 sub register_class {
1304 my ($self, $source_name, $to_register) = @_;
1305 $self->register_source($source_name => $to_register->result_source_instance);
1308 =head2 register_source
1312 =item Arguments: $source_name, L<$result_source|DBIx::Class::ResultSource>
1316 This method is called by L</register_class>.
1318 Registers the L<DBIx::Class::ResultSource> in the schema with the given
1323 sub register_source { shift->_register_source(@_) }
1325 =head2 unregister_source
1329 =item Arguments: $source_name
1333 Removes the L<DBIx::Class::ResultSource> from the schema for the given source name.
1337 sub unregister_source { shift->_unregister_source(@_) }
1339 =head2 register_extra_source
1343 =item Arguments: $source_name, L<$result_source|DBIx::Class::ResultSource>
1347 As L</register_source> but should be used if the result class already
1348 has a source and you want to register an extra one.
1352 sub register_extra_source { shift->_register_source(@_, { extra => 1 }) }
1354 sub _register_source {
1355 my ($self, $source_name, $source, $params) = @_;
1357 $source = $source->new({ %$source, source_name => $source_name });
1359 $source->schema($self);
1360 weaken $source->{schema} if ref($self);
1362 my %reg = %{$self->source_registrations};
1363 $reg{$source_name} = $source;
1364 $self->source_registrations(\%reg);
1366 return $source if $params->{extra};
1368 my $rs_class = $source->result_class;
1369 if ($rs_class and my $rsrc = try { $rs_class->result_source_instance } ) {
1370 my %map = %{$self->class_mappings};
1372 exists $map{$rs_class}
1374 $map{$rs_class} ne $source_name
1376 $rsrc ne $_[2] # orig_source
1379 "$rs_class already had a registered source which was replaced by this call. "
1380 . 'Perhaps you wanted register_extra_source(), though it is more likely you did '
1381 . 'something wrong.'
1385 $map{$rs_class} = $source_name;
1386 $self->class_mappings(\%map);
1392 my $global_phase_destroy;
1394 return if $global_phase_destroy ||= in_global_destruction;
1397 my $srcs = $self->source_registrations;
1399 for my $source_name (keys %$srcs) {
1400 # find first source that is not about to be GCed (someone other than $self
1401 # holds a reference to it) and reattach to it, weakening our own link
1403 # during global destruction (if we have not yet bailed out) this should throw
1404 # which will serve as a signal to not try doing anything else
1405 # however beware - on older perls the exception seems randomly untrappable
1406 # due to some weird race condition during thread joining :(((
1407 if (ref $srcs->{$source_name} and svref_2object($srcs->{$source_name})->REFCNT > 1) {
1410 $srcs->{$source_name}->schema($self);
1411 weaken $srcs->{$source_name};
1414 $global_phase_destroy = 1;
1422 sub _unregister_source {
1423 my ($self, $source_name) = @_;
1424 my %reg = %{$self->source_registrations};
1426 my $source = delete $reg{$source_name};
1427 $self->source_registrations(\%reg);
1428 if ($source->result_class) {
1429 my %map = %{$self->class_mappings};
1430 delete $map{$source->result_class};
1431 $self->class_mappings(\%map);
1436 =head2 compose_connection (DEPRECATED)
1440 =item Arguments: $target_namespace, @db_info
1442 =item Return Value: $new_schema
1446 DEPRECATED. You probably wanted compose_namespace.
1448 Actually, you probably just wanted to call connect.
1452 (hidden due to deprecation)
1454 Calls L<DBIx::Class::Schema/"compose_namespace"> to the target namespace,
1455 calls L<DBIx::Class::Schema/connection> with @db_info on the new schema,
1456 then injects the L<DBix::Class::ResultSetProxy> component and a
1457 resultset_instance classdata entry on all the new classes, in order to support
1458 $target_namespaces::$class->search(...) method calls.
1460 This is primarily useful when you have a specific need for class method access
1461 to a connection. In normal usage it is preferred to call
1462 L<DBIx::Class::Schema/connect> and use the resulting schema object to operate
1463 on L<DBIx::Class::ResultSet> objects with L<DBIx::Class::Schema/resultset> for
1470 sub compose_connection {
1471 my ($self, $target, @info) = @_;
1473 carp_once "compose_connection deprecated as of 0.08000"
1474 unless $INC{"DBIx/Class/CDBICompat.pm"};
1476 my $base = 'DBIx::Class::ResultSetProxy';
1478 eval "require ${base};"
1481 $self->throw_exception
1482 ("No arguments to load_classes and couldn't load ${base} ($_)")
1485 if ($self eq $target) {
1486 # Pathological case, largely caused by the docs on early C::M::DBIC::Plain
1487 foreach my $source_name ($self->sources) {
1488 my $source = $self->source($source_name);
1489 my $class = $source->result_class;
1490 $self->inject_base($class, $base);
1491 $class->mk_classdata(resultset_instance => $source->resultset);
1492 $class->mk_classdata(class_resolver => $self);
1494 $self->connection(@info);
1498 my $schema = $self->compose_namespace($target, $base);
1501 my $name = join '::', $target, 'schema';
1502 *$name = subname $name, sub { $schema };
1505 $schema->connection(@info);
1506 foreach my $source_name ($schema->sources) {
1507 my $source = $schema->source($source_name);
1508 my $class = $source->result_class;
1509 #warn "$source_name $class $source ".$source->storage;
1510 $class->mk_classdata(result_source_instance => $source);
1511 $class->mk_classdata(resultset_instance => $source->resultset);
1512 $class->mk_classdata(class_resolver => $schema);
1519 =head1 AUTHOR AND CONTRIBUTORS
1521 See L<AUTHOR|DBIx::Class/AUTHOR> and L<CONTRIBUTORS|DBIx::Class/CONTRIBUTORS> in DBIx::Class
1525 You may distribute this code under the same terms as Perl itself.