Jesse Luehrs

NAME

DBIx::Class::Schema::KiokuDB - Hybrid KiokuDB/DBIx::Class::Schema schema support.

VERSION

version 1.23

SYNOPSIS

Load this component into the schema:

    package MyApp::DB;
    use base qw(DBIx::Class::Schema);

    __PACKAGE__->load_components(qw(Schema::KiokuDB));

    __PAKCAGE__->load_namespaces;

Then load the DBIx::Class::KiokuDB component into every table that wants to refer to arbitrary KiokuDB objects:

    package MyApp::DB::Result::Album;
    use base qw(DBIx::Class::Core);

    __PACKAGE__->load_components(qw(KiokuDB));

    __PACKAGE__->table('album');

    __PACKAGE__->add_columns(
        id => { data_type => "integer" },
        title => { data_type => "varchar" },

        # the foreign key for the KiokuDB object:
        metadata => { data_type => "varchar" },
    );

    __PACKAGE__->set_primary_key('id');

    # enable a KiokuDB rel on the column:
    __PACKAGE__->kiokudb_column('metadata');

Connect to the DSN:

    my $dir = KiokuDB->connect(
        'dbi:SQLite:dbname=:memory:',
        schema => "MyApp::DB",
        create => 1,
    );

    # get the connect DBIC schema instance
    my $schema = $dir->backend->schema;

Then you can freely refer to KiokuDB objects from your Album class:

    $dir->txn_do(scope => 1, body => sub {

        $schema->resultset("Album")->create({
            title => "Blah blah",
            metadata => $any_object,
        });
    });

DESCRIPTION

This class provides the schema definition support code required for integrating an arbitrary DBIx::Class::Schema with KiokuDB::Backend::DBI.

REUSING AN EXISTING DBIx::Class SCHEMA

The example in the Synopis assumes that you want to first set up a KiokuDB and than link that to some DBIx::Class classes. Another use case is that you already have a configured DBIx::Class Schema and want to tack KiokuDB onto it.

The trick here is to make sure to load the KiokuDB schema using __PACKAGE__->define_kiokudb_schema() in your Schema class:

    package MyApp::DB;
    use base qw(DBIx::Class::Schema);

    __PACKAGE__->load_components(qw(Schema::KiokuDB));
    __PACKAGE__->define_kiokudb_schema();

    __PAKCAGE__->load_namespaces;

You can now get the KiokuDB directory handle like so:

    my $dir = $schema->kiokudb_handle;

For a complete example take a look at t/autovivify_handle.t.

USAGE AND LIMITATIONS

KiokuDB managed objects may hold references to row objects, resultsets (treated as saved searches, or results or cursor state is saved), result source handles, and the schema.

Foreign DBIx::Class objects, that is ones that originated from a schema that isn't the underlying schema are currently not supported, but this limitation may be lifted in the future.

All DBIC operations which may implicitly cause a lookup of a KIokuDB managed object require live object scope management, just as normal.

It is reccomended to use "txn_do" in KiokuDB because that will invoke the appropriate transaction hooks on both layers, as opposed to just in DBIx::Class.

SEE ALSO

DBIx::Class::KiokuDB, KiokuDB::Backend::DBI.

AUTHOR

Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.




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