About Data::ObjectDriver

Data::ObjectDriver id:clouder Yokohama.pm #5

About D::OD • Author: Benjamin Trott • Recently Version: 0.06 • Simple, transparent data interface, with caching. • Based on MT::ObjectDriver in MT. Now MT included D::OD.

D::OD features • Built-in supportRAM and Apache inPartitioning. Support Memcached, Caching and caching. • Have to support master-slaver_handle()/rw_handle(). Can change process for read/write using structure in mind. • Implementation is becauseso less model feature. But implement by myself, thin, east-to-use. of Has ‘has_a’ but not has ‘has_many’.

Class structures • Driver deﬁnition about how to connection to Class for class db and cache server, and partitioning rules. • Object classwhat you call. The model class Class for deﬁnition about how to treat data on tables.

Class structures • Other classes - D::OD::ResultSet In the middle of an implementation? Do not use in MT. - D::OD::Proﬁler Simple proﬁler. - D::OD::GearmanDBI I do not know how to use;)

Simple usase • Make object class for table Make sub-class of D::OD::BaseObject, and set table information using install_properties(). ‘driver’ is D::OD::Driver::DBI.

Simple usage package Artist; use strict; use base qw( Data::ObjectDriver::BaseObject ); __PACKAGE__->install_properties( datasource => 'artist', columns => [ qw( id name orig_name band_id ) ], primary_key => 'id', driver => Data::ObjectDriver::Driver::DBI->new( %DB_INFO ), ); 1;

CRUD and etc • Create my artist = Artist->new( name => ' ', fullname => ' II ' ); $artist->save; # or Artist->bulk_insert( [col1, col2], [ [d1, d2], [d1, d2] ]);

CRUD and etc • Read my $artist = Artist->lookup(1); print $artist->name; # or $artist_iter = Artist->search( { name => ' ' } ); @artists = Artist->search( { name => ' ' ); # or $artists_ref = Artist->lookup_multi( [ 1, 2, 3 ] );

CRUD and etc • Update $artist->name( ' ' ); $artist->save;

CRUD and etc • Delete $artist->remove;

CRUD and etc • has_a() __PACKAGE__->has_a( { class => 'Band', column => 'band_id', cached => 1, } );

CRUD and etc • add_trigger() post_load pre_search pre_insert pre_save post_save post_insert pre_update post_update pre_remove post_remove post_inﬂate __PACKAGE__->add_trigger( pre_insert => sub { my ( $obj, $orig_obj ) = @_; ... }, );

Caching • Only change driver If there is not cache, connect to db using D::OD::Driver::DBI.

Caching package Artist; use strict; use base qw( Data::ObjectDriver::BaseObject ); __PACKAGE__->install_properties( ... driver => Data::ObjectDriver::Driver::Cache::Memcached->new( cache => Cache::Memcached->new( servers => @servers ), fallback => Data::ObjectDriver::Driver::DBI->new( %DB_INFO ), ), ... ); 1;

Master-Slave structure • Only override r_handle().in read process, r_handle() is method that execute so this method is used to connect to slave database.

Master-Slave structure • Object class package Artist; use strict; use base qw( Data::ObjectDriver::BaseObject ); __PACKAGE__->install_properties( ... driver => Data::ObjectDriver::Driver::Cache::Memcached->new( cache => Cache::Memcached->new( servers => @servers ), fallback => ReplDriver->new( %DB_INFO, slaves => [ slave01, ... ] ), ), ... );

Master-Slave structure • Driver class package ReplDriver; use strict; use base qw( Data::ObjectDriver::Driver::DBI ); __PACKAGE__->mk_accessors( qw( slaves ) ); sub init { my $driver = shift; my %param = @_; $driver->slaves( delete $param{ slaves } ); $driver->SUPER::init( %param ); return $driver; } # cont.

Master-Slave structure • Driver class(cont.) # cont. sub r_handle { my $driver = shift; my $db = shift || 'main'; for my $slave ( shufﬂe @{ $driver->slaves } ) { # connect to $slave my $dbh = DBI->connect( $slave->{DB_INFO} ); $driver->dbd->init_dbh($dbh); return $dbh; } $driver->rw_handle($db); } 1;

Partitioning package CD; use strict; use base qw( Data::ObjectDriver::BaseObject ); __PACKAGE__->install_properties( datasource => 'cd', columns => [ qw( artist_id id title ) ], primary_key => [ qw( artist_id id ) ], driver => PartitionDriver->driver, ); 1;

Partitioning package PartitionDriver; use strict; sub driver { my $fallback = Data::ObjectDriver::Driver::Partition->new( get_driver => &ﬁnd_partition, ); Data::ObjectDriver::Driver::Cache::Memcached->new( cache => Cache::Memcached->new( servers => @servers ), fallback => $fallback, ), } # cont.

Partitioning # cont. sub ﬁnd_partition { my ( $terms, $args ) = @_; my $artist = Artist->lookup( $terms->{ artist_id } ); return ReplDriver->new( %{ $artist->partition_obj->master }, slaves => $artist->partition_obj->slaves, pk_generator => &pk_generator, ); } sub pk_generator { my $obj = shift; $obj->id( generate_id() ); 1; }, 1;

Partitioning my $cd = CD->new( artist_id => 1, title => ' ' ); $cd->save; lookup() is depends on PartitionDriver implementation in partitioning.

At the end, I wish... • Built-in support pager using Data::Page. • Wants count() and more useful methods. • Hard to execute simple SQL. (Just do using D::OD::SQL?) • And hard to execute ‘JOIN’.

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About Data::ObjectDriver

by Yoshiki Kurihara on Mar 07, 2010

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About Data::ObjectDriver — Presentation Transcript