=head1 SYNOPSIS
- package My::Schema;
+ package Library::Schema;
use base qw/DBIx::Class::Schema/;
- # load My::Schema::Foo, My::Schema::Bar, My::Schema::Baz
- __PACKAGE__->load_classes(qw/Foo Bar Baz/);
+ # load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD
+ __PACKAGE__->load_classes(qw/CD Book DVD/);
- package My::Schema::Foo;
+ package Library::Schema::CD;
use base qw/DBIx::Class/;
- __PACKAGE__->load_components(qw/PK::Auto::Pg Core/); # for example
- __PACKAGE__->table('foo');
+ __PACKAGE__->load_components(qw/PK::Auto Core/); # for example
+ __PACKAGE__->table('cd');
# Elsewhere in your code:
- my $schema1 = My::Schema->connect(
+ my $schema1 = Library::Schema->connect(
$dsn,
$user,
$password,
- $attrs
+ { AutoCommit => 0 },
);
- my $schema2 = My::Schema->connect($coderef_returning_dbh);
+ my $schema2 = Library::Schema->connect($coderef_returning_dbh);
- # fetch objects using My::Schema::Foo
- my $resultset = $schema1->resultset('Foo')->search( ... );
- my @objects = $schema2->resultset('Foo')->search( ... );
+ # fetch objects using Library::Schema::DVD
+ my $resultset = $schema1->resultset('DVD')->search( ... );
+ my @dvd_objects = $schema2->resultset('DVD')->search( ... );
=head1 DESCRIPTION
=head2 class
- my $class = $schema->class('Foo');
+ my $class = $schema->class('CD');
Retrieves the result class name for a given result source
=head2 source
- my $source = $schema->source('Foo');
+ my $source = $schema->source('Book');
Returns the result source object for the registered name
=head2 resultset
- my $rs = $schema->resultset('Foo');
+ my $rs = $schema->resultset('DVD');
Returns the resultset for the registered moniker
my $comp_class = "${prefix}::${comp}";
eval "use $comp_class"; # If it fails, assume the user fixed it
if ($@) {
- die $@ unless $@ =~ /Can't locate/;
+ $comp_class =~ s/::/\//g;
+ die $@ unless $@ =~ /Can't locate.+$comp_class\.pm\sin\s\@INC/;
+ warn $@ if $@;
}
push(@to_register, [ $comp, $comp_class ]);
}
=head2 compose_connection
-=head3 Arguments: <target> <@db_info>
+=head3 Arguments: $target_ns, @db_info
-This is the most important method in this class. it takes a target namespace,
-as well as dbh connection info, and creates a L<DBIx::Class::DB> class as
-well as subclasses for each of your database classes in this namespace, using
-this connection.
+=head3 Return value: $new_schema
-It will also setup a ->class method on the target class, which lets you
-resolve database classes based on the schema component name, for example
-
- MyApp::DB->class('Foo') # returns MyApp::DB::Foo,
- # which ISA MyApp::Schema::Foo
-
-This is the recommended API for accessing Schema generated classes, and
-using it might give you instant advantages with future versions of DBIC.
-
-WARNING: Loading components into Schema classes after compose_connection
-may not cause them to be seen by the classes in your target namespace due
-to the dispatch table approach used by Class::C3. If you do this you may find
-you need to call Class::C3->reinitialize() afterwards to get the behaviour
-you expect.
+Calls compose_namespace to the $target_ns, calls ->connection(@db_info) on
+the new schema, then injects the ResultSetProxy component and a
+resultset_instance classdata entry on all the new classes in order to support
+$target_ns::Class->search(...) method calls. Primarily useful when you have
+a specific need for classmethod access to a connection - in normal usage
+->connect is preferred.
=cut
return $schema;
}
+=head2 compose_namespace
+
+=head3 Arguments: $target_ns, $additional_base_class?
+
+=head3 Return value: $new_schema
+
+For each result source in the schema, creates a class in the target
+namespace (e.g. $target_ns::CD, $target_ns::Artist) inheriting from the
+corresponding classes attached to the current schema and a result source
+to match attached to the new $schema object. If an additional base class is
+given, injects this immediately behind the corresponding classes from the
+current schema in the created classes' @ISA.
+
+=cut
+
sub compose_namespace {
my ($self, $target, $base) = @_;
my %reg = %{ $self->source_registrations };
=head2 txn_do
-=head3 Arguments: <coderef>, [@coderef_args]
+=head3 Arguments: <$coderef>, [@coderef_args]
-Executes <coderef> with (optional) arguments <@coderef_args> transactionally,
-returning its result (if any). If an exception is caught, a rollback is issued
-and the exception is rethrown. If the rollback fails, (i.e. throws an
-exception) an exception is thrown that includes a "Rollback failed" message.
+Executes C<$coderef> with (optional) arguments C<@coderef_args>
+transactionally, returning its result (if any). If an exception is
+caught, a rollback is issued and the exception is rethrown. If the
+rollback fails, (i.e. throws an exception) an exception is thrown that
+includes a "Rollback failed" message.
For example,
- my $foo = $schema->resultset('foo')->find(1);
+ my $author_rs = $schema->resultset('Author')->find(1);
my $coderef = sub {
- my ($foo, @bars) = @_;
+ my ($author, @titles) = @_;
# If any one of these fails, the entire transaction fails
- $foo->create_related('bars', {
- col => $_
- }) foreach (@bars);
+ $author->create_related('books', {
+ title => $_
+ }) foreach (@titles);
- return $foo->bars;
+ return $author->books;
};
my $rs;
eval {
- $rs = $schema->txn_do($coderef, $foo, qw/foo bar baz/);
+ $rs = $schema->txn_do($coderef, $author_rs, qw/Night Day It/);
};
if ($@) {
die "something terrible has happened!";
} else {
deal_with_failed_transaction();
- die $error;
}
}
-Nested transactions should work as expected (i.e. only the outermost
-transaction will issue a txn_commit on the Schema's storage)
+Nested transactions work as expected (i.e. only the outermost
+transaction will issue a txn_commit on the Schema's storage), and
+txn_do() can be called in void, scalar and list context and it will
+behave as expected.
=cut
my $wantarray = wantarray; # Need to save this since it's reset in eval{}
eval {
- # Need to differentiate between scalar/list context to allow for returning
- # a list in scalar context to get the size of the list
+ # Need to differentiate between scalar/list context to allow for
+ # returning a list in scalar context to get the size of the list
+
if ($wantarray) {
+ # list context
@return_values = $coderef->(@args);
- } else {
+ } elsif (defined $wantarray) {
+ # scalar context
$return_value = $coderef->(@args);
+ } else {
+ # void context
+ $coderef->(@args);
}
$self->txn_commit;
};
@data should be a list of listrefs, the first containing column names, the
second matching values - i.e.
- $schema->populate('Foo', [
- [ qw/foo_id foo_string/ ],
- [ 1, 'One' ],
- [ 2, 'Two' ],
+ $schema->populate('Artist', [
+ [ qw/artistid name/ ],
+ [ 1, 'Popular Band' ],
+ [ 2, 'Indie Band' ],
...
]);
croak @_;
}
-=head2 deploy
+=head2 deploy (EXPERIMENTAL)
+
+Attempts to deploy the schema to the current storage using SQL::Translator.
-Attempts to deploy the schema to the current storage
+Note that this feature is currently EXPERIMENTAL and may not work correctly
+across all databases, or fully handle complex relationships.
=cut
projects / dbsrgits/DBIx-Class.git / blobdiff