NAME

DBIx::Class::Schema - composable schemas

SYNOPSIS

  package My::Schema;
  use base qw/DBIx::Class::Schema/;
  
  # load My::Schema::Foo, My::Schema::Bar, My::Schema::Baz
  __PACKAGE__->load_classes(qw/Foo Bar Baz/);

  package My::Schema::Foo;
  use base qw/DBIx::Class/;
  __PACKAGE__->load_components(qw/PK::Auto::Pg Core/); # for example
  __PACKAGE__->table('foo');

  my $schema1 = My::Schema->connect(
    $dsn,
    $user,
    $password,
    $attrs
  );

  my $schema2 = My::Schema->connect( ... );

  # fetch objects using My::Schema::Foo
  my $resultset = $schema1->resultset('Foo')->search( ... );
  my @objects = $schema2->resultset('Foo')->search( ... );

DESCRIPTION

Creates database classes based on a schema. This is the recommended way to use DBIx::Class and allows you to use more than one concurrent connection with your classes.

NB: If you're used to Class::DBI it's worth reading the "SYNOPSIS" carefully as DBIx::Class does things a little differently. Note in particular which module inherits off which.

METHODS

register_class <moniker> <component_class>

Registers a class which isa ResultSourceProxy; equivalent to calling

  $schema->register_source($moniker, $class->result_source_instance);

register_source <moniker> <result source>

Registers the result source in the schema with the given moniker

class

  my $class = $schema->class('Foo');

Retrieves the result class name for a given result source

source

  my $source = $schema->source('Foo');

Returns the result source object for the registered name

sources

  my @source_monikers = $schema->sources;

Returns the source monikers of all source registrations on this schema

resultset

  my $rs = $schema->resultset('Foo');

Returns the resultset for the registered moniker

load_classes [<classes>, (<class>, <class>), {<namespace> => [<classes>]}]

Uses Module::Find to find all classes under the database class' namespace, or uses the classes you select. Then it loads the component (using use), and registers them (using register_class);

It is possible to comment out classes with a leading '#', but note that perl will think it's a mistake (trying to use a comment in a qw list) so you'll need to add "no warnings 'qw';" before your load_classes call.

compose_connection <target> <@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 DBIx::Class::DB class as well as subclasses for each of your database classes in this namespace, using this connection.

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.

setup_connection_class <$target> <@info>

Sets up a database connection class to inject between the schema and the subclasses the schema creates.

connection(@args)

Instantiates a new Storage object of type storage_type and passes the arguments to $storage->connect_info. Sets the connection in-place on the schema.

connect(@info)

Conveneience method, equivalent to $schema->clone->connection(@info)

clone

Clones the schema and its associated result_source objects and returns the copy.

populate($moniker, \@data);

Populates the source registered with the given moniker with the supplied data. @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' ], ... ]);

throw_exception

Defaults to using Carp::Clan to report errors from user perspective.

AUTHORS

Matt S. Trout <mst@shadowcatsystems.co.uk>

LICENSE

You may distribute this code under the same terms as Perl itself.

cpanm DBIx::Class

perl -MCPAN -e shell
install DBIx::Class