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_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