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