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DBIx-ObjectMapper-0.3013
River stage zero No dependents
/ DBIx::ObjectMapper

NAME

DBIx::ObjectMapper - An implementation of the Data Mapper pattern (object-relational mapper).

SYNOPSIS

Create a engine and a mapper object.


            

              
              
use DBIx::ObjectMapper;
use DBIx::ObjectMapper::Engine::DBI;
my $engine = DBIx::ObjectMapper::Engine::DBI->new({
   dsn => 'dbi:SQLite:',
   username => undef,
   password => undef,
});
my $mapper = DBIx::ObjectMapper->new( engine => $engine );

Create a ordinary perl class.


            

              
              
package My::User;
use base qw(Class::Accessor::Fast);
__PACKAGE__->mk_accessors(qw(id name));
1;

Get/Define metadata of the table.


            

              
              
my $user_meta = $mapper->metadata->table( 'user' => 'autoload' );
# or
use DBIx::ObjectMapper::Metadata::Sugar qw(:all);
my $user_meta = $mapper->metadata->table(
    'user' => [
        Col( id => Int(), PrimaryKey ),
        Col( name => String(128), NotNull ),
    ]
);

Map the table metadata to the ordinary class.


            

              
              
$mapper->maps( $user_meta => 'My::User' );

Create session. And add My::User object to session object.


            

              
              
my $session = $mapper->begin_session;
my $user = My::User->new({ id => 1, name => 'name1' });
$session->add($user);

When the $session is destroyed, the session object send a insert query to the database.

Get a My::User Object.


            

              
              
my $session = $mapper->begin_session;
my $user = $session->get( 'My::User' => 1 );
$user->id;
$user->name;

DESCRIPTION

DBIx::ObjectMapper is a implementation of the Data Mapper pattern. And abstraction layer for database access.

Concepts and interfaces of this module borrowed from SQLAlchemy. http://www.sqlalchemy.org/

METHODS

new(%args)

engine

DBIx::ObjectMapper::Engine

metadata

By default DBIx::ObjectMapper::Metadata. Set a DBIx::ObjectMapper::Metadata based object if you want.

mapping_class

By default DBIx::ObjectMapper::Mapper. Set a DBIx::ObjectMapper::Mapper based object if you want.

session_class

By default DBIx::ObjectMapper::Session. Set a DBIx::ObjectMapper::Session based class if you want.

session_attr

Set a hash reference of counstructor parameters of DBIx::ObjectMapper::Session. When you call the begin_session method, you get a DBIx::ObjectMapper::Session object that this option is set up.

begin_session(%session_option)

Gets a session object instance, and begins session. See the DBIx::ObjectMapper::Session for more information.

maps(%map_config)

Sets a configuration of mapping. See the DBIx::ObjectMapper::Mapper for more information.

relation( $relation_type => \%relation_config )

DBIx::ObjectMapper::Relation

metadata()

Returns the metadata object.

engine()

Returns the engine object.

mapping_class()

Returns the mapping_class.

session_class()

Returns the session_class.

AUTHOR

Eisuke Oishi

CONTRIBUTORS

nekokak: Atsushi Kobayashi

COPYRIGHT

Copyright 2010 Eisuke Oishi

LICENSE

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