NAME

Catmandu::Store - Namespace for packages that can make data persistent

SYNOPSIS

# From the command line

$ catmandu import JSON into MongoDB --database_name 'bibliography' < data.json

$ catmandu export MongoDB --database_name 'bibliography' to YAML
$ catmandu export MongoDB --database_name 'bibliography' --query '{"PublicationYear": "1937"}'
$ catmandu count  MongoDB --database_name 'bibliography' --query '{"PublicationYear": "1937"}'

# From Perl
use Catmandu;

my $store = Catmandu->store('MongoDB',database_name => 'bibliography');

my $obj1 = $store->bag->add({ name => 'Patrick' });

printf "obj1 stored as %s\n" , $obj1->{_id};

# Force an id in the store
my $obj2 = $store->bag->add({ _id => 'test123' , name => 'Nicolas' });

my $obj3 = $store->bag->get('test123');

$store->bag->delete('test123');

$store->bag->delete_all;

# Some stores can be searched
my $hits = $store->bag->search(query => 'name:Patrick');

DESCRIPTION

A Catmandu::Store is a stub for Perl packages that can store data into databases or search engines. The database as a whole is called a 'store'. Databases also have compartments (e.g. tables) called Catmandu::Bag-s. Some stores can be searched using Catmandu::Searchable methods.

CONFIGURATION

default_plugins

Specify plugins that will be applied to every bag in the store.

my $store = Catmandu::Store::MyDB->new(default_plugins => ['Datestamps']);

default_bag

The name of the bag to use if no explicit bag is given. Default is 'data'.

my $store = Catmandu::Store::MyDB->new(default_bag => 'stuff');
# this will return the stuff bag
my $bag = $store->bag;

bags

Specify configuration for individual bags.

my $store = Catmandu::Store::Hash->new(
    bags => {stuff => {plugins => ['Datestamps']}});
# this bag will use the L<Catmandu::Plugin::Datestamps> role
$store->bag('stuff')
# this bag won't
$store->bag('otherbag')

bag_class

An optional custom class to use for bags. Default is Bag in the store's namespace. This class should consume the Catmandu::Bag role.

# this will use the Catmandu::Store::MyDB::Bag class for bags
Catmandu::Store::MyDB->new()
# this will use MyBag
Catmandu::Store::MyDB->new(bag_class => 'MyBag')

key_prefix

Use a custom prefix to mark the reserved or special keys that the store uses. By default an underscore gets prependend. The only special key in a normal store is '_id'. Catmandu::Plugin::Versioning will also use '_version'. Other plugins or stores may add their own special keys.

# this store will use the my_id key to hold id's
Catmandu::Store::MyDB->new(key_prefix => 'my_')

id_key

Define a custom key to hold id's for all bags of this store. See key_prefix for the default value. Also aliased as id_field. Note that this can also be overriden on a per bag basis.

METHODS

bag($name)

Create or retieve a bag with name $name. Returns a Catmandu::Bag.

key_for($key)

Helper method that applies key_prefix to the $key given.

log

Return the current logger. Can be used when creating your own Stores.

E.g.

package Catmandu::Store::Hash;

...

sub generator {
    my ($self) = @_;

    $self->log->debug("generating record");
    ...
}

See also: Catmandu for activating the logger in your main code.

SEE ALSO

Catmandu::Bag, Catmandu::Searchable