NAME
    Handel::Storage::RDBO - RDBO storage layer for Handel 1.x

SYNOPSIS
        use MyCustomCart;
        use strict;
        use warnings;
        use base qw/Handel::Base/;
    
        __PACKAGE__->storage_class('Handel::Storage::RDBO');
        __PACKAGE__->storage({
            schema_class   => 'Handel::Schema::RDBO::Cart',
            constraints    => {
                id         => {'Check Id'      => \&constraint_uuid},
                shopper    => {'Check Shopper' => \&constraint_uuid},
                type       => {'Check Type'    => \&constraint_cart_type},
                name       => {'Check Name'    => \&constraint_cart_name}
            },
            default_values => {
                id         => __PACKAGE__->storage_class->can('new_uuid'),
                type       => CART_TYPE_TEMP
            }
        });
    
        1;

DESCRIPTION
    Handel::Storage::RDBO is used as an intermediary between
    Handel::Cart/Handel::Order and the RDBO schema used for reading/writing
    to the database.

CONSTRUCTOR
  new
    Arguments: \%options

    Creates a new instance of Handel::Storage::RDBO, and passes the options
    to "setup" on the new instance. The three examples below are the same:

        my $storage = Handel::Storage::RDBO-new({
            schema_class  => 'Handel::Schema::RDBO::Cart'
        });
    
        my $storage = Handel::Storage::RDBO-new;
        $storage->setup({
            schema_source  => 'Handel::Schema::RDBO::Cart'
        });
    
        my $storage = Handel::Storage::RDBO->new;
        $storage->schema_source('Handel::Schema::RDBO::Cart');

    The following additional options are available to new/setup, and take
    the same data as their method counterparts:

        connection_info
        item_relationship
        schema_class
        schema_instance
        table_name

    See "new" in Handel::Storage a list of other possible options.

METHODS
  add_columns
    Arguments: @columns

    Adds a list of columns to the current schema_class. Be careful to always
    use the column names, not their accessor aliases.

        $storage->add_columns(qw/foo bar baz/);

    You can also add columns using the Rose::DB::Object::Meta syntax:

        $storage->add_columns(
            foo => {type => 'varchar', length => 36, not_null => 1},
            bar => {type => int, alias => 'get_bar'}
        );

    Yes, you can even mix/match the two:

        $storage->add_columns(
            'foo',
            bar => {type => int, alias => 'get_bar'},
            'baz'
        );

    Before schema_instance is initialized, the columns to be added are
    stored internally, then added to the schema_instance when it is
    initialized. If a schema_instance already exists, the columns are added
    directly to the schema_source in the schema_instance itself.

    See "add_columns" in Handel::Storage for more information about this
    method.

  add_item
    Arguments: $result, \%data

    Adds a new item to the specified result, returning a storage result
    object.

        my $storage = Handel::Storage::RDBO::Cart->new;
        my $result = $storage->create({
            shopper => '11111111-1111-1111-1111-111111111111'
        });
    
        my $item = $storage->add_item($result, {
            sku => 'ABC123'
        });
    
        print $item->sku;

    A Handel::Storage::Exception will be thrown if the specified result has
    no item relationship, has a relationship that can't be found in the
    schema, second parameter is not a HASH reference or no result is
    specified.

    See "add_item" in Handel::Storage for more information about this
    method.

  clone
    Returns a clone of the current storage instance. This is the same as
    "clone" in Handel::Storage except that it disconnects the db instance
    before cloning as DBI hates being cloned apparently.

    See "clone" in Handel::Storage for more information about this method.

  column_accessors
    Returns a hashref containing all of the columns and their accessor names
    for the current storage object.

    If a schema_instance already exists, the columns from schema_source in
    that schema_instance will be returned. If no schema_instance exists, the
    columns from schema_source in the current schema_class will be returned
    plus any columns to be added from add_columns minus and columns to be
    removed from remove_columns.

    See "column_accessors" in Handel::Storage for more information about
    this method.

  columns
    Returns a list of columns from the current schema source.

    See "columns" in Handel::Storage for more information about this method.

  connection_info
    Arguments: \@info

    Gets/sets the connection information used when connecting to the
    database.

        $storage->connection_info(['dbi:mysql:foo', 'user', 'pass', {PrintError=>1}]);

    The info argument is an array ref that holds the following values:

    $dsn
        The DBI dsn to use to connect to.

    $username
        The username for the database you are connecting to.

    $password
        The password for the database you are connecting to.

    \%attr
        The attributes to be pass to DBI for this connection.

    See DBI for more information about dsns and connection attributes.

  copyable_item_columns
    Returns a list of columns in the current item class that can be copied
    freely. This list is usually all columns in the item class except for
    the primary key columns and the foreign key columns that participate in
    the specified item relationship.

    A Handel::Storage::Exception will be thrown if item class or item
    relationship are not defined.

    See "copyable_item_columns" in Handel::Storage for more information
    about this method.

  count_items
    Arguments: $result

    Returns the number of items associated with the specified result.

        my $storage = Handel::Storage::RDBO::Cart->new;
        my $result = $storage->create({
            shopper => '11111111-1111-1111-1111-111111111111'
        });
    
        $result->add_item({
            sku => 'ABC123'
        });
    
        print $storage->count_items($result);

    A Handel::Storage::Exception will be thrown if the specified result has
    no item relationship or no result is specified.

    See "count_items" in Handel::Storage for more information about this
    method.

  create
    Arguments: \%data

    Creates a new result in the current source in the current schema.

        my $result = $storage->create({
            col1 => 'foo',
            col2 => 'bar'
        });

    See "create" in Handel::Storage for more information about this method.

  delete
    Arguments: \%filter

    Deletes results matching the filter in the current source in the current
    schema.

        $storage->delete({
            id => '11111111-1111-1111-1111-111111111111'
        });

    See "delete" in Handel::Storage for more information about this method.

  delete_items
    Arguments: $result, \%filter

    Deletes items matching the filter from the specified result.

        my $storage = Handel::Storage::RDBO::Cart->new;
        my $result = $storage->create({
            shopper => '11111111-1111-1111-1111-111111111111'
        });
    
        $result->add_item({
            sku => 'ABC123'
        });
    
        $storage->delete_items($result, {
            sku => 'ABC%'
        });

    A Handel::Storage::Exception will be thrown if the specified result has
    no item relationship.

    See "delete_items" in Handel::Storage for more information about this
    method.

  has_column
    Arguments: $column

    Returns true if the column exists in the current storage object. If the
    schema is already initialized, the has_column method on the result
    source will be used. Otherwise, has_column will calculate the existence
    of the column based on any current add_columns/remove_columns
    information.

  item_relationship
    Arguments: $relationship_name

    Gets/sets the name of the schema relationship between carts and items.
    The default item relationship is 'items'.

        # in your schema classes
        MySchema::CustomCart->meta->setup(
            relationships => [
                rel_items => {
                    type       => 'one to many',
                    class      => 'Handel::Schema::RDBO::Cart::Item',
                    column_map => {id => 'cart'}
                }
            ]
        );
    
        # in your storage
        $storage->item_relationship('rel_items');

  primary_columns
    Arguments @columns

    Gets/sets the list of primary columns for the current schema_class. When
    the schema instance exists, the primary columns are added to and returns
    from the current schema source on the schema instance.

    When no schema instance exists, the columns are set locally like
    "add_columns" then added to the schema instance during its
    configuration. Primary columns are returns from the current schema
    source in the current schema class if no primary columns have been set
    locally.

  remove_columns
    Arguments: @columns

    Removes a list of columns from the current schema_class and removes the
    autogenerated accessors from the current class. Be careful to always use
    the column names, not their accessor aliases.

        $storage->remove_columns(qw/description/);

    Before schema_instance is initialized, the columns to be removed are
    stored internally, then removed from the schema_instance when it is
    initialized. If a schema_instance already exists, the columns are
    removed directly from the schema_source in the schema_instance itself.

    See "remove_columns" in Handel::Storage for more information about this
    method.

  schema_class
    Arguments: $schema_class

    Gets/sets the schema class to be used for database reading/writing.

        $storage->schema_class('MySchema');

    A Handel::Exception::Storage exception will be thrown if the specified
    class can not be loaded.

  schema_instance
    Arguments: $schema_instance

    Gets/sets the schema instance to be used for database reading/writing.
    If no instance exists, a new one will be created from the specified
    schema class. When a new schema instance is created or assigned, it is
    cloned and the clone is altered and used, leaving the original schema
    untouched.

    See Handel::Manual::Schema for more detailed information about how the
    schema instance is configured.

  search
    Arguments: \%filter

    Returns results in list context, or an iterator in scalar context from
    the current source in the current schema matching the search filter.

        my $iterator = $storage->search({
            col1 => 'foo'
        });

        my @results = $storage->search({
            col1 => 'foo'
        });

    See "search" in Handel::Storage for more information about this method.

  search_items
    Arguments: $result, \%filter

    Returns items matching the filter associated with the specified result.

        my $storage = Handel::Storage::RDBO::Cart->new;
        my $result = $storage->search({
            id => '11111111-1111-1111-1111-111111111111'
        });
    
        my $iterator = $storage->search_items($result);

    Returns results in list context, or an iterator in scalar context from
    the current source in the current schema matching the search filter.

    A Handel::Storage::Exception will be thrown if the specified result has
    no item relationship.

    See "search_items" in Handel::Storage for more information about this
    method.

  setup
    Arguments: \%options

    Configures a storage instance with the options specified. Setup accepts
    the exact same options that "new" does.

        package MyStorageClass;
        use strict;
        use warnings;
        use base qw/Handel::Storage::RDBO/;
    
        __PACKAGE__->setup({
            schema_class => 'MySchema::Cart'
        });
    
        # or
    
        my $storage = Handel::Storage::RDBO-new;
        $storage->setup({
            schema_class => 'MySchema::Cart'
        });

    This is the same as doing:

        my $storage = Handel::Storage::RDBO-new({
            schema_class => 'MySchema::Cart'
        });

    If you call setup on a storage instance or class that has already been
    configured, its configuration will be updated with the new options. No
    attempt will be made to clear or reset the unspecified settings back to
    their defaults.

    If you pass in a schema_instance, it will be assigned last after all of
    the other options have been applied.

  table_name
    Arguments: $table_name

    Gets/sets the name of the table in the database to be used for this
    schema source.

  txn_begin
    Starts a transaction on the current schema instance.

  txn_commit
    Commits the current transaction on the current schema instance.

  txn_rollback
    Rolls back the current transaction on the current schema instance.

SEE ALSO
    Handel::Storage, Handel::Storage::Result, Handel::Manual::Storage,
    Handel::Storage::RDBO::Result, Handel::Storage::RDBO::Cart,
    Handel::Storage::RDBO::Order

AUTHOR
        Christopher H. Laco
        CPAN ID: CLACO
        claco@chrislaco.com
        http://today.icantfocus.com/blog/