X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass.pm;h=5bfd5bc966e5a0a8f9149f16a18c8a05195e6629;hb=ef26a3929ebefc93ed94116553cfe3c7280a9579;hp=d862203a4ca92b3cf356072b8e8f81ea989d84d6;hpb=75a23b3e351f37ed420f182492d441ccbdca6569;p=dbsrgits%2FDBIx-Class.git diff --git a/lib/DBIx/Class.pm b/lib/DBIx/Class.pm index d862203..5bfd5bc 100644 --- a/lib/DBIx/Class.pm +++ b/lib/DBIx/Class.pm @@ -4,32 +4,156 @@ use strict; use warnings; use vars qw($VERSION); -use base qw/DBIx::Class::Componentised Class::Data::Inheritable/; +use base qw/DBIx::Class::Componentised Class::Data::Accessor/; -$VERSION = '0.03999_02'; +sub mk_classdata { shift->mk_classaccessor(@_); } +sub component_base_class { 'DBIx::Class' } +# Always remember to do all digits for the version even if they're 0 +# i.e. first release of 0.XX *must* be 0.XX000. This avoids fBSD ports +# brain damage and presumably various other packaging systems too + +$VERSION = '0.06999_03'; + +sub MODIFY_CODE_ATTRIBUTES { + my ($class,$code,@attrs) = @_; + $class->mk_classdata('__attr_cache' => {}) + unless $class->can('__attr_cache'); + $class->__attr_cache->{$code} = [@attrs]; + return (); +} + +sub _attr_cache { + my $self = shift; + my $cache = $self->can('__attr_cache') ? $self->__attr_cache : {}; + my $rest = eval { $self->next::method }; + return $@ ? $cache : { %$cache, %$rest }; +} 1; -=head1 NAME +=head1 NAME DBIx::Class - Extensible and flexible object <-> relational mapper. =head1 SYNOPSIS -=head1 DESCRIPTION +Create a schema class called DB/Main.pm: + + package DB::Main; + use base qw/DBIx::Class::Schema/; + + __PACKAGE__->load_classes(); + + 1; + +Create a table class to represent artists, who have many CDs, in DB/Main/Artist.pm: + + package DB::Main::Artist; + use base qw/DBIx::Class/; + + __PACKAGE__->load_components(qw/PK::Auto Core/); + __PACKAGE__->table('artist'); + __PACKAGE__->add_columns(qw/ artistid name /); + __PACKAGE__->set_primary_key('artistid'); + __PACKAGE__->has_many(cds => 'DB::Main::CD'); + + 1; + +A table class to represent a CD, which belongs to an artist, in DB/Main/CD.pm: + + package DB::Main::CD; + use base qw/DBIx::Class/; + + __PACKAGE__->load_components(qw/PK::Auto Core/); + __PACKAGE__->table('cd'); + __PACKAGE__->add_columns(qw/ cdid artist title year /); + __PACKAGE__->set_primary_key('cdid'); + __PACKAGE__->belongs_to(artist => 'DB::Main::Artist'); + + 1; + +Then you can use these classes in your application's code: + + # Connect to your database. + use DB::Main; + my $schema = DB::Main->connect($dbi_dsn, $user, $pass, \%dbi_params); -This is a sql to oop mapper, inspired by the L framework, -and meant to support compability with it, while restructuring the -insides, and making it possible to support some new features like -self-joins, distinct, group bys and more. + # Query for all artists and put them in an array, + # or retrieve them as a result set object. + my @all_artists = $schema->resultset('Artist')->all; + my $all_artists_rs = $schema->resultset('Artist'); -It's currently considered EXPERIMENTAL - bring this near a production -database at your own risk! The API is *not* fixed yet, although most of -the primitives should be good for the future and any API changes will be -posted to the mailing list before they're committed. + # Create a result set to search for artists. + # This does not query the DB. + my $johns_rs = $schema->resultset('Artist')->search( + # Build your WHERE using an SQL::Abstract structure: + { name => { like => 'John%' } } + ); -The community can be found via - + # Execute a joined query to get the cds. + my @all_john_cds = $johns_rs->search_related('cds')->all; + + # Fetch only the next row. + my $first_john = $johns_rs->next; + + # Specify ORDER BY on the query. + my $first_john_cds_by_title_rs = $first_john->cds( + undef, + { order_by => 'title' } + ); + + # Create a result set that will fetch the artist relationship + # at the same time as it fetches CDs, using only one query. + my $millennium_cds_rs = $schema->resultset('CD')->search( + { year => 2000 }, + { prefetch => 'artist' } + ); + + my $cd = $millennium_cds_rs->next; # SELECT ... FROM cds JOIN artists ... + my $cd_artist_name = $cd->artist->name; # Already has the data so no query + + my $new_cd = $schema->resultset('CD')->new({ title => 'Spoon' }); + $new_cd->artist($cd->artist); + $new_cd->insert; # Auto-increment primary key filled in after INSERT + $new_cd->title('Fork'); + + $schema->txn_do(sub { $new_cd->update }); # Runs the update in a transaction + + $millennium_cds_rs->update({ year => 2002 }); # Single-query bulk update + +=head1 DESCRIPTION + +This is an SQL to OO mapper with an object API inspired by L +(and a compatibility layer as a springboard for porting) and a resultset API +that allows abstract encapsulation of database operations. It aims to make +representing queries in your code as perl-ish as possible while still +providing access to as many of the capabilities of the database as possible, +including retrieving related records from multiple tables in a single query, +JOIN, LEFT JOIN, COUNT, DISTINCT, GROUP BY and HAVING support. + +DBIx::Class can handle multi-column primary and foreign keys, complex +queries and database-level paging, and does its best to only query the +database in order to return something you've directly asked for. If a +resultset is used as an iterator it only fetches rows off the statement +handle as requested in order to minimise memory usage. It has auto-increment +support for SQLite, MySQL, PostgreSQL, Oracle, SQL Server and DB2 and is +known to be used in production on at least the first four, and is fork- +and thread-safe out of the box (although your DBD may not be). + +This project is still under rapid development, so features added in the +latest major release may not work 100% yet -- check the Changes if you run +into trouble, and beware of anything explicitly marked EXPERIMENTAL. Failing +test cases are *always* welcome and point releases are put out rapidly as +bugs are found and fixed. + +Even so, we do our best to maintain full backwards compatibility for published +APIs, since DBIx::Class is used in production in a number of organisations. +The test suite is quite substantial, and several developer releases are +generally made to CPAN before the -current branch is merged back to trunk for +a major release. + +The community can be found via: Mailing list: http://lists.rawmode.org/mailman/listinfo/dbix-class/ @@ -39,75 +163,74 @@ The community can be found via - IRC: irc.perl.org#dbix-class -=head1 QUICKSTART +=head1 WHERE TO GO NEXT -If you're using Class::DBI, and want an easy and fast way of migrating to -DBIx::Class look at L. +L lists each task you might want help on, and +the modules where you will find documentation. -There are two ways of using DBIx::Class, the 'simple' and the 'schema' one. +=head1 AUTHOR -The 'simple' way of using DBIx::Class needs less classes than the 'schema' -way but doesn't give you the ability to use different database connections. +mst: Matt S. Trout -Some examples where different database connections are useful are: +=head1 CONTRIBUTORS -different users with different rights -different databases with the same schema. +abraxxa: Alexander Hartmaier -=head1 Simple +andyg: Andy Grundman -First you need to create a base class all other classes inherit from. +ank: Andres Kievsky -Look at L how to do this +blblack: Brandon Black -Next you need to create a class for every table you want to use with -DBIx::Class. +bluefeet: Aran Deltac -Look at L how to do this. +LTJake: Brian Cassidy +claco: Christopher H. Laco -=head2 Schema +clkao: CL Kao -With this approach the table classes inherit directly from DBIx::Class::Core, -although it might be a good idea to create a 'parent' class for all table -classes which inherits from DBIx::Class::Core and adds additional methods -needed by all table classes, e.g. reading a config file, loading auto primary -key support. +typester: Daisuke Murase -Look at L how to do this. +dkubb: Dan Kubb -If you need more hand-holding, check out the introduction in the -manual below. +Numa: Dan Sully -=head1 SEE ALSO +dwc: Daniel Westermann-Clark -=over 4 +ningu: David Kamholz -=item L - DBIC Core Classes +jesper: Jesper Krogh -=item L - L Compat layer. +castaway: Jess Robinson -=item L - User's manual. +quicksilver: Jules Bean -=back +jguenther: Justin Guenther -=head1 AUTHOR +captainL: Luke Saunders -Matt S. Trout +draven: Marcus Ramberg -=head1 CONTRIBUTORS +nigel: Nigel Metheringham + +paulm: Paul Makepeace + +phaylon: Robert Sedlacek + +sc_: Just Another Perl Hacker -Andy Grundman +konobi: Scott McWhirter -Brian Cassidy +scotty: Scotty Allen -Dan Kubb +sszabo: Stephan Szabo -Dan Sully +Todd Lipcon -davekam +wdh: Will Hawes -Marcus Ramberg +gphat: Cory G Watson =head1 LICENSE