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 all Result classes in Library/Schema/Result/
33 __PACKAGE__->load_namespaces();
35 package Library::Schema::Result::CD;
36 use base qw/DBIx::Class/;
37 __PACKAGE__->load_components(qw/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::Result::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.
66 =head2 load_namespaces
70 =item Arguments: %options?
74 __PACKAGE__->load_namespaces();
76 __PACKAGE__->load_namespaces(
77 result_namespace => 'Res',
78 resultset_namespace => 'RSet',
79 default_resultset_class => '+MyDB::Othernamespace::RSet',
82 With no arguments, this method uses L<Module::Find> to load all your
83 Result classes from a sub-namespace F<Result> under your Schema class'
84 namespace. Eg. With a Schema of I<MyDB::Schema> all files in
85 I<MyDB::Schema::Result> are assumed to be Result classes.
87 It also finds all ResultSet classes in the namespace F<ResultSet> and
88 loads them into the appropriate Result classes using for you. The
89 matching is done by assuming the package name of the ResultSet class
90 is the same as that of the Result class.
92 You will be warned if ResultSet classes are discovered for which there
93 are no matching Result classes like this:
95 load_namespaces found ResultSet class $classname with no corresponding Result class
97 If a Result class is found to already have a ResultSet class set using
98 L</resultset_class> to some other class, you will be warned like this:
100 We found ResultSet class '$rs_class' for '$result', but it seems
101 that you had already set '$result' to use '$rs_set' instead
103 Both of the sub-namespaces are configurable if you don't like the defaults,
104 via the options C<result_namespace> and C<resultset_namespace>.
106 If (and only if) you specify the option C<default_resultset_class>, any found
107 Result classes for which we do not find a corresponding
108 ResultSet class will have their C<resultset_class> set to
109 C<default_resultset_class>.
111 All of the namespace and classname options to this method are relative to
112 the schema classname by default. To specify a fully-qualified name, prefix
113 it with a literal C<+>.
117 # load My::Schema::Result::CD, My::Schema::Result::Artist,
118 # My::Schema::ResultSet::CD, etc...
119 My::Schema->load_namespaces;
121 # Override everything to use ugly names.
122 # In this example, if there is a My::Schema::Res::Foo, but no matching
123 # My::Schema::RSets::Foo, then Foo will have its
124 # resultset_class set to My::Schema::RSetBase
125 My::Schema->load_namespaces(
126 result_namespace => 'Res',
127 resultset_namespace => 'RSets',
128 default_resultset_class => 'RSetBase',
131 # Put things in other namespaces
132 My::Schema->load_namespaces(
133 result_namespace => '+Some::Place::Results',
134 resultset_namespace => '+Another::Place::RSets',
137 If you'd like to use multiple namespaces of each type, simply use an arrayref
138 of namespaces for that option. In the case that the same result
139 (or resultset) class exists in multiple namespaces, the latter entries in
140 your list of namespaces will override earlier ones.
142 My::Schema->load_namespaces(
143 # My::Schema::Results_C::Foo takes precedence over My::Schema::Results_B::Foo :
144 result_namespace => [ 'Results_A', 'Results_B', 'Results_C' ],
145 resultset_namespace => [ '+Some::Place::RSets', 'RSets' ],
150 # Pre-pends our classname to the given relative classname or
151 # class namespace, unless there is a '+' prefix, which will
153 sub _expand_relative_name {
154 my ($class, $name) = @_;
156 $name = $class . '::' . $name if ! ($name =~ s/^\+//);
160 # Finds all modules in the supplied namespace, or if omitted in the
161 # namespace of $class. Untaints all findings as they can be assumed
165 my $ns = shift || ref $proto || $proto;
167 my @mods = Module::Find::findallmod($ns);
169 # try to untaint module names. mods where this fails
170 # are left alone so we don't have to change the old behavior
171 no locale; # localized \w doesn't untaint expression
172 return map { $_ =~ m/^( (?:\w+::)* \w+ )$/x ? $1 : $_ } @mods;
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 sub load_namespaces {
194 my ($class, %args) = @_;
196 my $result_namespace = delete $args{result_namespace} || 'Result';
197 my $resultset_namespace = delete $args{resultset_namespace} || 'ResultSet';
198 my $default_resultset_class = delete $args{default_resultset_class};
200 $class->throw_exception('load_namespaces: unknown option(s): '
201 . join(q{,}, map { qq{'$_'} } keys %args))
202 if scalar keys %args;
204 $default_resultset_class
205 = $class->_expand_relative_name($default_resultset_class);
207 for my $arg ($result_namespace, $resultset_namespace) {
208 $arg = [ $arg ] if !ref($arg) && $arg;
210 $class->throw_exception('load_namespaces: namespace arguments must be '
211 . 'a simple string or an arrayref')
212 if ref($arg) ne 'ARRAY';
214 $_ = $class->_expand_relative_name($_) for (@$arg);
217 my %results = $class->_map_namespaces(@$result_namespace);
218 my %resultsets = $class->_map_namespaces(@$resultset_namespace);
222 no warnings 'redefine';
223 local *Class::C3::reinitialize = sub { };
224 use warnings 'redefine';
226 # ensure classes are loaded and fetch properly sorted classes
227 $class->ensure_class_loaded($_) foreach(values %results);
228 my @subclass_last = sort { $results{$a}->isa($results{$b}) } keys(%results);
230 foreach my $result (@subclass_last) {
231 my $result_class = $results{$result};
233 my $rs_class = delete $resultsets{$result};
234 my $rs_set = $result_class->resultset_class;
236 if($rs_set && $rs_set ne 'DBIx::Class::ResultSet') {
237 if($rs_class && $rs_class ne $rs_set) {
238 warn "We found ResultSet class '$rs_class' for '$result', but it seems "
239 . "that you had already set '$result' to use '$rs_set' instead";
242 elsif($rs_class ||= $default_resultset_class) {
243 $class->ensure_class_loaded($rs_class);
244 $result_class->resultset_class($rs_class);
247 my $source_name = $result_class->source_name || $result;
249 push(@to_register, [ $source_name, $result_class ]);
253 foreach (sort keys %resultsets) {
254 warn "load_namespaces found ResultSet class $_ with no "
255 . 'corresponding Result class';
258 Class::C3->reinitialize;
259 $class->register_class(@$_) for (@to_register);
268 =item Arguments: @classes?, { $namespace => [ @classes ] }+
272 Alternative method to L</load_namespaces> which you should look at
275 With no arguments, this method uses L<Module::Find> to find all classes under
276 the schema's namespace. Otherwise, this method loads the classes you specify
277 (using L<use>), and registers them (using L</"register_class">).
279 It is possible to comment out classes with a leading C<#>, but note that perl
280 will think it's a mistake (trying to use a comment in a qw list), so you'll
281 need to add C<no warnings 'qw';> before your load_classes call.
283 If any classes found do not appear to be Result class files, you will
284 get the following warning:
286 Failed to load $comp_class. Can't find source_name method. Is
287 $comp_class really a full DBIC result class? Fix it, move it elsewhere,
288 or make your load_classes call more specific.
292 My::Schema->load_classes(); # loads My::Schema::CD, My::Schema::Artist,
293 # etc. (anything under the My::Schema namespace)
295 # loads My::Schema::CD, My::Schema::Artist, Other::Namespace::Producer but
296 # not Other::Namespace::LinerNotes nor My::Schema::Track
297 My::Schema->load_classes(qw/ CD Artist #Track /, {
298 Other::Namespace => [qw/ Producer #LinerNotes /],
304 my ($class, @params) = @_;
309 foreach my $param (@params) {
310 if (ref $param eq 'ARRAY') {
311 # filter out commented entries
312 my @modules = grep { $_ !~ /^#/ } @$param;
314 push (@{$comps_for{$class}}, @modules);
316 elsif (ref $param eq 'HASH') {
317 # more than one namespace possible
318 for my $comp ( keys %$param ) {
319 # filter out commented entries
320 my @modules = grep { $_ !~ /^#/ } @{$param->{$comp}};
322 push (@{$comps_for{$comp}}, @modules);
326 # filter out commented entries
327 push (@{$comps_for{$class}}, $param) if $param !~ /^#/;
331 my @comp = map { substr $_, length "${class}::" }
333 $comps_for{$class} = \@comp;
338 no warnings qw/redefine/;
339 local *Class::C3::reinitialize = sub { };
340 foreach my $prefix (keys %comps_for) {
341 foreach my $comp (@{$comps_for{$prefix}||[]}) {
342 my $comp_class = "${prefix}::${comp}";
343 $class->ensure_class_loaded($comp_class);
345 my $snsub = $comp_class->can('source_name');
347 warn "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.";
350 $comp = $snsub->($comp_class) || $comp;
352 push(@to_register, [ $comp, $comp_class ]);
356 Class::C3->reinitialize;
358 foreach my $to (@to_register) {
359 $class->register_class(@$to);
360 # if $class->can('result_source_instance');
368 =item Arguments: $storage_type|{$storage_type, \%args}
370 =item Return value: $storage_type|{$storage_type, \%args}
372 =item Default value: DBIx::Class::Storage::DBI
376 Set the storage class that will be instantiated when L</connect> is called.
377 If the classname starts with C<::>, the prefix C<DBIx::Class::Storage> is
378 assumed by L</connect>.
380 You want to use this to set subclasses of L<DBIx::Class::Storage::DBI>
381 in cases where the appropriate subclass is not autodetected, such as
382 when dealing with MSSQL via L<DBD::Sybase>, in which case you'd set it
383 to C<::DBI::Sybase::MSSQL>.
385 If your storage type requires instantiation arguments, those are
386 defined as a second argument in the form of a hashref and the entire
387 value needs to be wrapped into an arrayref or a hashref. We support
388 both types of refs here in order to play nice with your
389 Config::[class] or your choice. See
390 L<DBIx::Class::Storage::DBI::Replicated> for an example of this.
392 =head2 exception_action
396 =item Arguments: $code_reference
398 =item Return value: $code_reference
400 =item Default value: None
404 If C<exception_action> is set for this class/object, L</throw_exception>
405 will prefer to call this code reference with the exception as an argument,
406 rather than L<DBIx::Class::Exception/throw>.
408 Your subroutine should probably just wrap the error in the exception
409 object/class of your choosing and rethrow. If, against all sage advice,
410 you'd like your C<exception_action> to suppress a particular exception
411 completely, simply have it return true.
416 use base qw/DBIx::Class::Schema/;
417 use My::ExceptionClass;
418 __PACKAGE__->exception_action(sub { My::ExceptionClass->throw(@_) });
419 __PACKAGE__->load_classes;
422 my $schema_obj = My::Schema->connect( .... );
423 $schema_obj->exception_action(sub { My::ExceptionClass->throw(@_) });
425 # suppress all exceptions, like a moron:
426 $schema_obj->exception_action(sub { 1 });
432 =item Arguments: boolean
436 Whether L</throw_exception> should include stack trace information.
437 Defaults to false normally, but defaults to true if C<$ENV{DBIC_TRACE}>
440 =head2 sqlt_deploy_hook
444 =item Arguments: $sqlt_schema
448 An optional sub which you can declare in your own Schema class that will get
449 passed the L<SQL::Translator::Schema> object when you deploy the schema via
450 L</create_ddl_dir> or L</deploy>.
452 For an example of what you can do with this, see
453 L<DBIx::Class::Manual::Cookbook/Adding Indexes And Functions To Your SQL>.
455 Note that sqlt_deploy_hook is called by L</deployment_statements>, which in turn
456 is called before L</deploy>. Therefore the hook can be used only to manipulate
457 the L<SQL::Translator::Schema> object before it is turned into SQL fed to the
458 database. If you want to execute post-deploy statements which can not be generated
459 by L<SQL::Translator>, the currently suggested method is to overload L</deploy>
460 and use L<dbh_do|DBIx::Class::Storage::DBI/dbh_do>.
468 =item Arguments: @connectinfo
470 =item Return Value: $new_schema
474 Creates and returns a new Schema object. The connection info set on it
475 is used to create a new instance of the storage backend and set it on
478 See L<DBIx::Class::Storage::DBI/"connect_info"> for DBI-specific
479 syntax on the C<@connectinfo> argument, or L<DBIx::Class::Storage> in
482 Note that C<connect_info> expects an arrayref of arguments, but
483 C<connect> does not. C<connect> wraps it's arguments in an arrayref
484 before passing them to C<connect_info>.
488 sub connect { shift->clone->connection(@_) }
494 =item Arguments: $source_name
496 =item Return Value: $resultset
500 my $rs = $schema->resultset('DVD');
502 Returns the L<DBIx::Class::ResultSet> object for the registered source
508 my ($self, $moniker) = @_;
509 return $self->source($moniker)->resultset;
516 =item Return Value: @source_names
520 my @source_names = $schema->sources;
522 Lists names of all the sources registered on this Schema object.
526 sub sources { return keys %{shift->source_registrations}; }
532 =item Arguments: $source_name
534 =item Return Value: $result_source
538 my $source = $schema->source('Book');
540 Returns the L<DBIx::Class::ResultSource> object for the registered
546 my ($self, $moniker) = @_;
547 my $sreg = $self->source_registrations;
548 return $sreg->{$moniker} if exists $sreg->{$moniker};
550 # if we got here, they probably passed a full class name
551 my $mapped = $self->class_mappings->{$moniker};
552 $self->throw_exception("Can't find source for ${moniker}")
553 unless $mapped && exists $sreg->{$mapped};
554 return $sreg->{$mapped};
561 =item Arguments: $source_name
563 =item Return Value: $classname
567 my $class = $schema->class('CD');
569 Retrieves the Result class name for the given source name.
574 my ($self, $moniker) = @_;
575 return $self->source($moniker)->result_class;
582 =item Arguments: C<$coderef>, @coderef_args?
584 =item Return Value: The return value of $coderef
588 Executes C<$coderef> with (optional) arguments C<@coderef_args> atomically,
589 returning its result (if any). Equivalent to calling $schema->storage->txn_do.
590 See L<DBIx::Class::Storage/"txn_do"> for more information.
592 This interface is preferred over using the individual methods L</txn_begin>,
593 L</txn_commit>, and L</txn_rollback> below.
595 WARNING: If you are connected with C<AutoCommit => 0> the transaction is
596 considered nested, and you will still need to call L</txn_commit> to write your
597 changes when appropriate. You will also want to connect with C<auto_savepoint =>
598 1> to get partial rollback to work, if the storage driver for your database
601 Connecting with C<AutoCommit => 1> is recommended.
608 $self->storage or $self->throw_exception
609 ('txn_do called on $schema without storage');
611 $self->storage->txn_do(@_);
614 =head2 txn_scope_guard (EXPERIMENTAL)
616 Runs C<txn_scope_guard> on the schema's storage. See
617 L<DBIx::Class::Storage/txn_scope_guard>.
621 sub txn_scope_guard {
624 $self->storage or $self->throw_exception
625 ('txn_scope_guard called on $schema without storage');
627 $self->storage->txn_scope_guard(@_);
632 Begins a transaction (does nothing if AutoCommit is off). Equivalent to
633 calling $schema->storage->txn_begin. See
634 L<DBIx::Class::Storage::DBI/"txn_begin"> for more information.
641 $self->storage or $self->throw_exception
642 ('txn_begin called on $schema without storage');
644 $self->storage->txn_begin;
649 Commits the current transaction. Equivalent to calling
650 $schema->storage->txn_commit. See L<DBIx::Class::Storage::DBI/"txn_commit">
651 for more information.
658 $self->storage or $self->throw_exception
659 ('txn_commit called on $schema without storage');
661 $self->storage->txn_commit;
666 Rolls back the current transaction. Equivalent to calling
667 $schema->storage->txn_rollback. See
668 L<DBIx::Class::Storage::DBI/"txn_rollback"> for more information.
675 $self->storage or $self->throw_exception
676 ('txn_rollback called on $schema without storage');
678 $self->storage->txn_rollback;
683 my $storage = $schema->storage;
685 Returns the L<DBIx::Class::Storage> object for this Schema. Grab this
686 if you want to turn on SQL statement debugging at runtime, or set the
687 quote character. For the default storage, the documentation can be
688 found in L<DBIx::Class::Storage::DBI>.
694 =item Arguments: $source_name, \@data;
696 =item Return value: \@$objects | nothing
700 Pass this method a resultsource name, and an arrayref of
701 arrayrefs. The arrayrefs should contain a list of column names,
702 followed by one or many sets of matching data for the given columns.
704 In void context, C<insert_bulk> in L<DBIx::Class::Storage::DBI> is used
705 to insert the data, as this is a fast method. However, insert_bulk currently
706 assumes that your datasets all contain the same type of values, using scalar
707 references in a column in one row, and not in another will probably not work.
709 Otherwise, each set of data is inserted into the database using
710 L<DBIx::Class::ResultSet/create>, and a arrayref of the resulting row
715 $schema->populate('Artist', [
716 [ qw/artistid name/ ],
717 [ 1, 'Popular Band' ],
722 Since wantarray context is basically the same as looping over $rs->create(...)
723 you won't see any performance benefits and in this case the method is more for
724 convenience. Void context sends the column information directly to storage
725 using <DBI>s bulk insert method. So the performance will be much better for
726 storages that support this method.
728 Because of this difference in the way void context inserts rows into your
729 database you need to note how this will effect any loaded components that
730 override or augment insert. For example if you are using a component such
731 as L<DBIx::Class::UUIDColumns> to populate your primary keys you MUST use
732 wantarray context if you want the PKs automatically created.
737 my ($self, $name, $data) = @_;
738 if(my $rs = $self->resultset($name)) {
739 if(defined wantarray) {
740 return $rs->populate($data);
742 $rs->populate($data);
745 $self->throw_exception("$name is not a resultset");
753 =item Arguments: @args
755 =item Return Value: $new_schema
759 Similar to L</connect> except sets the storage object and connection
760 data in-place on the Schema class. You should probably be calling
761 L</connect> to get a proper Schema object instead.
767 my ($self, @info) = @_;
768 return $self if !@info && $self->storage;
770 my ($storage_class, $args) = ref $self->storage_type ?
771 ($self->_normalize_storage_type($self->storage_type),{}) : ($self->storage_type, {});
773 $storage_class = 'DBIx::Class::Storage'.$storage_class
774 if $storage_class =~ m/^::/;
775 eval "require ${storage_class};";
776 $self->throw_exception(
777 "No arguments to load_classes and couldn't load ${storage_class} ($@)"
779 my $storage = $storage_class->new($self=>$args);
780 $storage->connect_info(\@info);
781 $self->storage($storage);
785 sub _normalize_storage_type {
786 my ($self, $storage_type) = @_;
787 if(ref $storage_type eq 'ARRAY') {
788 return @$storage_type;
789 } elsif(ref $storage_type eq 'HASH') {
790 return %$storage_type;
792 $self->throw_exception('Unsupported REFTYPE given: '. ref $storage_type);
796 =head2 compose_namespace
800 =item Arguments: $target_namespace, $additional_base_class?
802 =item Retur Value: $new_schema
806 For each L<DBIx::Class::ResultSource> in the schema, this method creates a
807 class in the target namespace (e.g. $target_namespace::CD,
808 $target_namespace::Artist) that inherits from the corresponding classes
809 attached to the current schema.
811 It also attaches a corresponding L<DBIx::Class::ResultSource> object to the
812 new $schema object. If C<$additional_base_class> is given, the new composed
813 classes will inherit from first the corresponding classe from the current
814 schema then the base class.
816 For example, for a schema with My::Schema::CD and My::Schema::Artist classes,
818 $schema->compose_namespace('My::DB', 'Base::Class');
819 print join (', ', @My::DB::CD::ISA) . "\n";
820 print join (', ', @My::DB::Artist::ISA) ."\n";
822 will produce the output
824 My::Schema::CD, Base::Class
825 My::Schema::Artist, Base::Class
829 # this might be oversimplified
830 # sub compose_namespace {
831 # my ($self, $target, $base) = @_;
833 # my $schema = $self->clone;
834 # foreach my $moniker ($schema->sources) {
835 # my $source = $schema->source($moniker);
836 # my $target_class = "${target}::${moniker}";
837 # $self->inject_base(
838 # $target_class => $source->result_class, ($base ? $base : ())
840 # $source->result_class($target_class);
841 # $target_class->result_source_instance($source)
842 # if $target_class->can('result_source_instance');
843 # $schema->register_source($moniker, $source);
848 sub compose_namespace {
849 my ($self, $target, $base) = @_;
850 my $schema = $self->clone;
852 no warnings qw/redefine/;
853 # local *Class::C3::reinitialize = sub { };
854 foreach my $moniker ($schema->sources) {
855 my $source = $schema->source($moniker);
856 my $target_class = "${target}::${moniker}";
858 $target_class => $source->result_class, ($base ? $base : ())
860 $source->result_class($target_class);
861 $target_class->result_source_instance($source)
862 if $target_class->can('result_source_instance');
863 $schema->register_source($moniker, $source);
866 # Class::C3->reinitialize();
869 no warnings 'redefine';
870 foreach my $meth (qw/class source resultset/) {
871 *{"${target}::${meth}"} =
872 sub { shift->schema->$meth(@_) };
878 sub setup_connection_class {
879 my ($class, $target, @info) = @_;
880 $class->inject_base($target => 'DBIx::Class::DB');
881 #$target->load_components('DB');
882 $target->connection(@info);
887 Creates a new savepoint (does nothing outside a transaction).
888 Equivalent to calling $schema->storage->svp_begin. See
889 L<DBIx::Class::Storage::DBI/"svp_begin"> for more information.
894 my ($self, $name) = @_;
896 $self->storage or $self->throw_exception
897 ('svp_begin called on $schema without storage');
899 $self->storage->svp_begin($name);
904 Releases a savepoint (does nothing outside a transaction).
905 Equivalent to calling $schema->storage->svp_release. See
906 L<DBIx::Class::Storage::DBI/"svp_release"> for more information.
911 my ($self, $name) = @_;
913 $self->storage or $self->throw_exception
914 ('svp_release called on $schema without storage');
916 $self->storage->svp_release($name);
921 Rollback to a savepoint (does nothing outside a transaction).
922 Equivalent to calling $schema->storage->svp_rollback. See
923 L<DBIx::Class::Storage::DBI/"svp_rollback"> for more information.
928 my ($self, $name) = @_;
930 $self->storage or $self->throw_exception
931 ('svp_rollback called on $schema without storage');
933 $self->storage->svp_rollback($name);
940 =item Return Value: $new_schema
944 Clones the schema and its associated result_source objects and returns the
951 my $clone = { (ref $self ? %$self : ()) };
952 bless $clone, (ref $self || $self);
954 $clone->class_mappings({ %{$clone->class_mappings} });
955 $clone->source_registrations({ %{$clone->source_registrations} });
956 foreach my $moniker ($self->sources) {
957 my $source = $self->source($moniker);
958 my $new = $source->new($source);
959 # we use extra here as we want to leave the class_mappings as they are
960 # but overwrite the source_registrations entry with the new source
961 $clone->register_extra_source($moniker => $new);
963 $clone->storage->set_schema($clone) if $clone->storage;
967 =head2 throw_exception
971 =item Arguments: $message
975 Throws an exception. Defaults to using L<Carp::Clan> to report errors from
976 user's perspective. See L</exception_action> for details on overriding
977 this method's behavior. If L</stacktrace> is turned on, C<throw_exception>'s
978 default behavior will provide a detailed stack trace.
982 sub throw_exception {
985 DBIx::Class::Exception->throw($_[0], $self->stacktrace)
986 if !$self->exception_action || !$self->exception_action->(@_);
993 =item Arguments: $sqlt_args, $dir
997 Attempts to deploy the schema to the current storage using L<SQL::Translator>.
999 See L<SQL::Translator/METHODS> for a list of values for C<$sqlt_args>. The most
1000 common value for this would be C<< { add_drop_table => 1, } >> to have the SQL
1001 produced include a DROP TABLE statement for each table created. For quoting
1002 purposes use C<producer_options> value with C<quote_table_names> and
1003 C<quote_field_names>.
1005 Additionally, the DBIx::Class parser accepts a C<sources> parameter as a hash
1006 ref or an array ref, containing a list of source to deploy. If present, then
1007 only the sources listed will get deployed. Furthermore, you can use the
1008 C<add_fk_index> parser parameter to prevent the parser from creating an index for each
1014 my ($self, $sqltargs, $dir) = @_;
1015 $self->throw_exception("Can't deploy without storage") unless $self->storage;
1016 $self->storage->deploy($self, undef, $sqltargs, $dir);
1019 =head2 deployment_statements
1023 =item Arguments: $rdbms_type, $sqlt_args, $dir
1025 =item Return value: $listofstatements
1029 A convenient shortcut to storage->deployment_statements(). Returns the
1030 SQL statements used by L</deploy> and
1031 L<DBIx::Class::Schema::Storage/deploy>. C<$rdbms_type> provides the
1032 (optional) SQLT (not DBI) database driver name for which the SQL
1033 statements are produced. If not supplied, the type is determined by
1034 interrogating the current connection. The other two arguments are
1035 identical to those of L</deploy>.
1039 sub deployment_statements {
1042 $self->throw_exception("Can't generate deployment statements without a storage")
1043 if not $self->storage;
1045 $self->storage->deployment_statements($self, @_);
1048 =head2 create_ddl_dir (EXPERIMENTAL)
1052 =item Arguments: \@databases, $version, $directory, $preversion, $sqlt_args
1056 Creates an SQL file based on the Schema, for each of the specified
1057 database types, in the given directory. Given a previous version number,
1058 this will also create a file containing the ALTER TABLE statements to
1059 transform the previous schema into the current one. Note that these
1060 statements may contain DROP TABLE or DROP COLUMN statements that can
1061 potentially destroy data.
1063 The file names are created using the C<ddl_filename> method below, please
1064 override this method in your schema if you would like a different file
1065 name format. For the ALTER file, the same format is used, replacing
1066 $version in the name with "$preversion-$version".
1068 See L<DBIx::Class::Schema/deploy> for details of $sqlt_args.
1070 If no arguments are passed, then the following default values are used:
1074 =item databases - ['MySQL', 'SQLite', 'PostgreSQL']
1076 =item version - $schema->schema_version
1078 =item directory - './'
1080 =item preversion - <none>
1084 Note that this feature is currently EXPERIMENTAL and may not work correctly
1085 across all databases, or fully handle complex relationships.
1087 WARNING: Please check all SQL files created, before applying them.
1091 sub create_ddl_dir {
1094 $self->throw_exception("Can't create_ddl_dir without storage") unless $self->storage;
1095 $self->storage->create_ddl_dir($self, @_);
1102 =item Arguments: $database-type, $version, $directory, $preversion
1104 =item Return value: $normalised_filename
1108 my $filename = $table->ddl_filename($type, $version, $dir, $preversion)
1110 This method is called by C<create_ddl_dir> to compose a file name out of
1111 the supplied directory, database type and version number. The default file
1112 name format is: C<$dir$schema-$version-$type.sql>.
1114 You may override this method in your schema if you wish to use a different
1120 my ($self, $type, $version, $dir, $preversion) = @_;
1122 my $filename = ref($self);
1123 $filename =~ s/::/-/g;
1124 $filename = File::Spec->catfile($dir, "$filename-$version-$type.sql");
1125 $filename =~ s/$version/$preversion-$version/ if($preversion);
1132 Provided as the recommended way of thawing schema objects. You can call
1133 C<Storable::thaw> directly if you wish, but the thawed objects will not have a
1134 reference to any schema, so are rather useless
1139 my ($self, $obj) = @_;
1140 local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
1141 return Storable::thaw($obj);
1146 This doesn't actualy do anything more than call L<Storable/freeze>, it is just
1147 provided here for symetry.
1152 return Storable::freeze($_[1]);
1157 Recommeneded way of dcloning objects. This is needed to properly maintain
1158 references to the schema object (which itself is B<not> cloned.)
1163 my ($self, $obj) = @_;
1164 local $DBIx::Class::ResultSourceHandle::thaw_schema = $self;
1165 return Storable::dclone($obj);
1168 =head2 schema_version
1170 Returns the current schema class' $VERSION in a normalised way.
1174 sub schema_version {
1176 my $class = ref($self)||$self;
1178 # does -not- use $schema->VERSION
1179 # since that varies in results depending on if version.pm is installed, and if
1180 # so the perl or XS versions. If you want this to change, bug the version.pm
1181 # author to make vpp and vxs behave the same.
1186 $version = ${"${class}::VERSION"};
1192 =head2 register_class
1196 =item Arguments: $moniker, $component_class
1200 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.
1202 You will only need this method if you have your Result classes in
1203 files which are not named after the packages (or all in the same
1204 file). You may also need it to register classes at runtime.
1206 Registers a class which isa DBIx::Class::ResultSourceProxy. Equivalent to
1209 $schema->register_source($moniker, $component_class->result_source_instance);
1213 sub register_class {
1214 my ($self, $moniker, $to_register) = @_;
1215 $self->register_source($moniker => $to_register->result_source_instance);
1218 =head2 register_source
1222 =item Arguments: $moniker, $result_source
1226 This method is called by L</register_class>.
1228 Registers the L<DBIx::Class::ResultSource> in the schema with the given
1233 sub register_source {
1236 $self->_register_source(@_);
1239 =head2 register_extra_source
1243 =item Arguments: $moniker, $result_source
1247 As L</register_source> but should be used if the result class already
1248 has a source and you want to register an extra one.
1252 sub register_extra_source {
1255 $self->_register_source(@_, { extra => 1 });
1258 sub _register_source {
1259 my ($self, $moniker, $source, $params) = @_;
1261 $source = $source->new({ %$source, source_name => $moniker });
1263 my %reg = %{$self->source_registrations};
1264 $reg{$moniker} = $source;
1265 $self->source_registrations(\%reg);
1267 $source->schema($self);
1268 weaken($source->{schema}) if ref($self);
1269 return if ($params->{extra});
1271 if ($source->result_class) {
1272 my %map = %{$self->class_mappings};
1273 if (exists $map{$source->result_class}) {
1274 warn $source->result_class . ' already has a source, use register_extra_source for additional sources';
1276 $map{$source->result_class} = $moniker;
1277 $self->class_mappings(\%map);
1281 sub _unregister_source {
1282 my ($self, $moniker) = @_;
1283 my %reg = %{$self->source_registrations};
1285 my $source = delete $reg{$moniker};
1286 $self->source_registrations(\%reg);
1287 if ($source->result_class) {
1288 my %map = %{$self->class_mappings};
1289 delete $map{$source->result_class};
1290 $self->class_mappings(\%map);
1295 =head2 compose_connection (DEPRECATED)
1299 =item Arguments: $target_namespace, @db_info
1301 =item Return Value: $new_schema
1305 DEPRECATED. You probably wanted compose_namespace.
1307 Actually, you probably just wanted to call connect.
1311 (hidden due to deprecation)
1313 Calls L<DBIx::Class::Schema/"compose_namespace"> to the target namespace,
1314 calls L<DBIx::Class::Schema/connection> with @db_info on the new schema,
1315 then injects the L<DBix::Class::ResultSetProxy> component and a
1316 resultset_instance classdata entry on all the new classes, in order to support
1317 $target_namespaces::$class->search(...) method calls.
1319 This is primarily useful when you have a specific need for class method access
1320 to a connection. In normal usage it is preferred to call
1321 L<DBIx::Class::Schema/connect> and use the resulting schema object to operate
1322 on L<DBIx::Class::ResultSet> objects with L<DBIx::Class::Schema/resultset> for
1332 sub compose_connection {
1333 my ($self, $target, @info) = @_;
1335 warn "compose_connection deprecated as of 0.08000"
1336 unless ($INC{"DBIx/Class/CDBICompat.pm"} || $warn++);
1338 my $base = 'DBIx::Class::ResultSetProxy';
1339 eval "require ${base};";
1340 $self->throw_exception
1341 ("No arguments to load_classes and couldn't load ${base} ($@)")
1344 if ($self eq $target) {
1345 # Pathological case, largely caused by the docs on early C::M::DBIC::Plain
1346 foreach my $moniker ($self->sources) {
1347 my $source = $self->source($moniker);
1348 my $class = $source->result_class;
1349 $self->inject_base($class, $base);
1350 $class->mk_classdata(resultset_instance => $source->resultset);
1351 $class->mk_classdata(class_resolver => $self);
1353 $self->connection(@info);
1357 my $schema = $self->compose_namespace($target, $base);
1360 my $name = join '::', $target, 'schema';
1361 *$name = Sub::Name::subname $name, sub { $schema };
1364 $schema->connection(@info);
1365 foreach my $moniker ($schema->sources) {
1366 my $source = $schema->source($moniker);
1367 my $class = $source->result_class;
1368 #warn "$moniker $class $source ".$source->storage;
1369 $class->mk_classdata(result_source_instance => $source);
1370 $class->mk_classdata(resultset_instance => $source->resultset);
1371 $class->mk_classdata(class_resolver => $schema);
1381 Matt S. Trout <mst@shadowcatsystems.co.uk>
1385 You may distribute this code under the same terms as Perl itself.