X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass.pm;h=75eb74f978f3edfea1ffce22d44ffbc11173dd2f;hb=bc0c980086ba429cf33b1d471d1035601727231f;hp=9f02215dad80a438f82c02a036cc5a39ba0dc039;hpb=4db53147659188879e74f8add5b8fddb8034d40d;p=dbsrgits%2FDBIx-Class.git diff --git a/lib/DBIx/Class.pm b/lib/DBIx/Class.pm index 9f02215..75eb74f 100644 --- a/lib/DBIx/Class.pm +++ b/lib/DBIx/Class.pm @@ -4,9 +4,31 @@ 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 = '0.04001'; +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 + +$VERSION = '0.05999_04'; + +sub MODIFY_CODE_ATTRIBUTES { + my ($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; @@ -16,83 +38,152 @@ DBIx::Class - Extensible and flexible object <-> relational mapper. =head1 SYNOPSIS -=head1 DESCRIPTION +Create a base schema class called DB/Main.pm: -This is an SQL to OO mapper, inspired by the L framework, -and meant to support compability with it, while restructuring the -internals and making it possible to support some new features like -self-joins, distinct, group bys and more. + package DB::Main; + use base qw/DBIx::Class::Schema/; -This project is still at an early stage, so the maintainers don't make -any absolute promise that full backwards-compatibility will be supported; -however, if we can without compromising the improvements we're trying to -make, we will, and any non-compatible changes will merit a full justification -on the mailing list and a CPAN developer release for people to test against. + __PACKAGE__->load_classes(); -The community can be found via - + 1; - Mailing list: http://lists.rawmode.org/mailman/listinfo/dbix-class/ +Create a class the represent artists, who have many +CDs, in DB/Main/Artist.pm: - SVN: http://dev.catalyst.perl.org/repos/bast/trunk/DBIx-Class/ + package DB::Main::Artist; + use base qw/DBIx::Class/; - Wiki: http://dbix-class.shadowcatsystems.co.uk/ + __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'); - IRC: irc.perl.org#dbix-class + 1; + +A 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. + my $ds = DB::Main->connect(@dbi_dsn); + + # Query for all artists and put them in an array, + # or retrieve them as a result set object. + my @all_artists = $ds->resultset('Artist')->all; + my $all_artists_rs = $ds->resultset('Artist'); + + # Create a result set to search for artists. + # This does not query the DB, yet. + my $johns_rs = $ds->resultset('Artist')->search( + # Build your WHERE using an SQL::Abstract structure: + { 'name' => { 'like', 'John%' } } + ); + + # Now the query is executed. + my @all_john_cds = $johns_rs->search_related('cds')->all; + + # Queries but only fetches one row so far. + my $first_john = $johns_rs->next; + + my $first_john_cds_by_title_rs = $first_john->cds( + undef, + { order_by => 'title' } + ); + + my $millenium_cds_rs = $ds->resultset('CD')->search( + { year => 2000 }, + { prefetch => 'artist' } + ); + + my $cd = $millenium_cds_rs->next; # SELECT ... FROM cds JOIN artists ... + my $cd_artist_name = $cd->artist->name; # Already has the data so no query -=head1 QUICKSTART + my $new_cd = $ds->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'); -If you're using L, and want an easy and fast way of migrating to -DBIx::Class, take a look at L. + $ds->txn_do(sub { $new_cd->update }); # Runs the update in a transaction -There are two ways of using DBIx::Class, the "simple" way and the "schema" way. -The "simple" way of using DBIx::Class needs less classes than the "schema" -way but doesn't give you the ability to easily use different database connections. + $millenium_cds_rs->update({ year => 2002 }); # Single-query bulk update -Some examples where different database connections are useful are: +=head1 DESCRIPTION -different users with different rights -different databases with the same schema. +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 when it actually needs to in order to return something the user's +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 your 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 now fairly substantial and several developer releases are +generally made to CPAN before the -current branch is merged back to trunk. -=head2 Simple +The community can be found via - -First you need to create a base class which all other classes will inherit from. -See L for information on how to do this. + Mailing list: http://lists.rawmode.org/mailman/listinfo/dbix-class/ -Then you need to create a class for every table you want to use with DBIx::Class. -See L for information on how to do this. + SVN: http://dev.catalyst.perl.org/repos/bast/trunk/DBIx-Class/ -=head2 Schema + Wiki: http://dbix-class.shadowcatsystems.co.uk/ -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 that inherits from DBIx::Class::Core and adds additional methods -needed by all table classes, e.g. reading a config file or loading auto primary -key support. + IRC: irc.perl.org#dbix-class -Look at L for information on how to do this. +=head1 WHERE TO GO NEXT -If you need more help, check out the introduction in the -manual below. +=over 4 -=head1 SEE ALSO +=item L - user's manual -=head2 L - DBIC Core Classes +=item L - DBIC Core Classes -=head2 L - User's manual +=item L - L Compat layer -=head2 L - L Compat layer +=item L - schema and connection container -=head2 L - database-level methods +=item L - tables and table-like things -=head2 L - table-level methods +=item L - encapsulates a query and its results -=head2 L - row-level methods +=item L - row-level methods -=head2 L - primary key methods +=item L - primary key methods -=head2 L - search result-set methods +=item L - relationships between tables -=head2 L - relationships between tables +=back =head1 AUTHOR @@ -100,22 +191,56 @@ Matt S. Trout =head1 CONTRIBUTORS +Alexander Hartmaier + Andy Grundman +Andres Kievsky + +Brandon Black + Brian Cassidy +Christopher H. Laco + +CL Kao + +Daisuke Murase + Dan Kubb Dan Sully +Daniel Westermann-Clark + David Kamholz +Jesper Krogh + +Jess Robinson + Jules Bean +Justin Guenther + Marcus Ramberg +Nigel Metheringham + Paul Makepeace +Robert Sedlacek + +sc_ of irc.perl.org#dbix-class + +Scott McWhirter (konobi) + +Scotty Allen + +Todd Lipcon + +Will Hawes + =head1 LICENSE You may distribute this code under the same terms as Perl itself.