9 *DBIx::Class::_ENV_::OLD_MRO = sub () { 1 };
13 *DBIx::Class::_ENV_::OLD_MRO = sub () { 0 };
19 use DBIx::Class::Optional::Dependencies;
21 use vars qw($VERSION);
22 use base qw/DBIx::Class::Componentised DBIx::Class::AccessorGroup/;
23 use DBIx::Class::StartupCheck;
26 shift->mk_classaccessor(@_);
29 sub mk_classaccessor {
31 $self->mk_group_accessors('inherited', $_[0]);
32 $self->set_inherited(@_) if @_ > 1;
35 sub component_base_class { 'DBIx::Class' }
37 # Always remember to do all digits for the version even if they're 0
38 # i.e. first release of 0.XX *must* be 0.XX000. This avoids fBSD ports
39 # brain damage and presumably various other packaging systems too
42 $VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases
44 sub MODIFY_CODE_ATTRIBUTES {
45 my ($class,$code,@attrs) = @_;
46 $class->mk_classdata('__attr_cache' => {})
47 unless $class->can('__attr_cache');
48 $class->__attr_cache->{$code} = [@attrs];
54 my $cache = $self->can('__attr_cache') ? $self->__attr_cache : {};
58 %{ $self->maybe::next::method || {} },
66 DBIx::Class - Extensible and flexible object <-> relational mapper.
68 =head1 GETTING HELP/SUPPORT
70 The community can be found via:
74 =item * Web Site: L<http://www.dbix-class.org/>
76 =item * IRC: irc.perl.org#dbix-class
79 <a href="http://chat.mibbit.com/#dbix-class@irc.perl.org">(click for instant chatroom login)</a>
81 =item * Mailing list: L<http://lists.scsys.co.uk/mailman/listinfo/dbix-class>
83 =item * RT Bug Tracker: L<https://rt.cpan.org/Dist/Display.html?Queue=DBIx-Class>
85 =item * gitweb: L<http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=dbsrgits/DBIx-Class.git>
87 =item * git: L<git://git.shadowcat.co.uk/dbsrgits/DBIx-Class.git>
89 =item * twitter L<http://www.twitter.com/dbix_class>
95 Create a schema class called MyDB/Schema.pm:
98 use base qw/DBIx::Class::Schema/;
100 __PACKAGE__->load_namespaces();
104 Create a result class to represent artists, who have many CDs, in
105 MyDB/Schema/Result/Artist.pm:
107 See L<DBIx::Class::ResultSource> for docs on defining result classes.
109 package MyDB::Schema::Result::Artist;
110 use base qw/DBIx::Class::Core/;
112 __PACKAGE__->table('artist');
113 __PACKAGE__->add_columns(qw/ artistid name /);
114 __PACKAGE__->set_primary_key('artistid');
115 __PACKAGE__->has_many(cds => 'MyDB::Schema::Result::CD');
119 A result class to represent a CD, which belongs to an artist, in
120 MyDB/Schema/Result/CD.pm:
122 package MyDB::Schema::Result::CD;
123 use base qw/DBIx::Class::Core/;
125 __PACKAGE__->load_components(qw/InflateColumn::DateTime/);
126 __PACKAGE__->table('cd');
127 __PACKAGE__->add_columns(qw/ cdid artistid title year /);
128 __PACKAGE__->set_primary_key('cdid');
129 __PACKAGE__->belongs_to(artist => 'MyDB::Schema::Result::Artist', 'artistid');
133 Then you can use these classes in your application's code:
135 # Connect to your database.
137 my $schema = MyDB::Schema->connect($dbi_dsn, $user, $pass, \%dbi_params);
139 # Query for all artists and put them in an array,
140 # or retrieve them as a result set object.
141 # $schema->resultset returns a DBIx::Class::ResultSet
142 my @all_artists = $schema->resultset('Artist')->all;
143 my $all_artists_rs = $schema->resultset('Artist');
145 # Output all artists names
146 # $artist here is a DBIx::Class::Row, which has accessors
147 # for all its columns. Rows are also subclasses of your Result class.
148 foreach $artist (@all_artists) {
149 print $artist->name, "\n";
152 # Create a result set to search for artists.
153 # This does not query the DB.
154 my $johns_rs = $schema->resultset('Artist')->search(
155 # Build your WHERE using an SQL::Abstract structure:
156 { name => { like => 'John%' } }
159 # Execute a joined query to get the cds.
160 my @all_john_cds = $johns_rs->search_related('cds')->all;
162 # Fetch the next available row.
163 my $first_john = $johns_rs->next;
165 # Specify ORDER BY on the query.
166 my $first_john_cds_by_title_rs = $first_john->cds(
168 { order_by => 'title' }
171 # Create a result set that will fetch the artist data
172 # at the same time as it fetches CDs, using only one query.
173 my $millennium_cds_rs = $schema->resultset('CD')->search(
175 { prefetch => 'artist' }
178 my $cd = $millennium_cds_rs->next; # SELECT ... FROM cds JOIN artists ...
179 my $cd_artist_name = $cd->artist->name; # Already has the data so no 2nd query
181 # new() makes a DBIx::Class::Row object but doesnt insert it into the DB.
182 # create() is the same as new() then insert().
183 my $new_cd = $schema->resultset('CD')->new({ title => 'Spoon' });
184 $new_cd->artist($cd->artist);
185 $new_cd->insert; # Auto-increment primary key filled in after INSERT
186 $new_cd->title('Fork');
188 $schema->txn_do(sub { $new_cd->update }); # Runs the update in a transaction
190 # change the year of all the millennium CDs at once
191 $millennium_cds_rs->update({ year => 2002 });
195 This is an SQL to OO mapper with an object API inspired by L<Class::DBI>
196 (with a compatibility layer as a springboard for porting) and a resultset API
197 that allows abstract encapsulation of database operations. It aims to make
198 representing queries in your code as perl-ish as possible while still
199 providing access to as many of the capabilities of the database as possible,
200 including retrieving related records from multiple tables in a single query,
201 JOIN, LEFT JOIN, COUNT, DISTINCT, GROUP BY, ORDER BY and HAVING support.
203 DBIx::Class can handle multi-column primary and foreign keys, complex
204 queries and database-level paging, and does its best to only query the
205 database in order to return something you've directly asked for. If a
206 resultset is used as an iterator it only fetches rows off the statement
207 handle as requested in order to minimise memory usage. It has auto-increment
208 support for SQLite, MySQL, PostgreSQL, Oracle, SQL Server and DB2 and is
209 known to be used in production on at least the first four, and is fork-
210 and thread-safe out of the box (although
211 L<your DBD may not be|DBI/Threads_and_Thread_Safety>).
213 This project is still under rapid development, so large new features may be
214 marked EXPERIMENTAL - such APIs are still usable but may have edge bugs.
215 Failing test cases are *always* welcome and point releases are put out rapidly
216 as bugs are found and fixed.
218 We do our best to maintain full backwards compatibility for published
219 APIs, since DBIx::Class is used in production in many organisations,
220 and even backwards incompatible changes to non-published APIs will be fixed
221 if they're reported and doing so doesn't cost the codebase anything.
223 The test suite is quite substantial, and several developer releases
224 are generally made to CPAN before the branch for the next release is
225 merged back to trunk for a major release.
227 =head1 WHERE TO GO NEXT
229 L<DBIx::Class::Manual::DocMap> lists each task you might want help on, and
230 the modules where you will find documentation.
234 mst: Matt S. Trout <mst@shadowcatsystems.co.uk>
236 (I mostly consider myself "project founder" these days but the AUTHOR heading
241 abraxxa: Alexander Hartmaier <abraxxa@cpan.org>
243 aherzog: Adam Herzog <adam@herzogdesigns.com>
245 Alexander Keusch <cpan@keusch.at>
247 alnewkirk: Al Newkirk <we@ana.im>
249 amiri: Amiri Barksdale <amiri@metalabel.com>
251 amoore: Andrew Moore <amoore@cpan.org>
253 andyg: Andy Grundman <andy@hybridized.org>
257 arc: Aaron Crane <arc@cpan.org>
259 arcanez: Justin Hunter <justin.d.hunter@gmail.com>
261 ash: Ash Berlin <ash@cpan.org>
263 bert: Norbert Csongradi <bert@cpan.org>
265 blblack: Brandon L. Black <blblack@gmail.com>
267 bluefeet: Aran Deltac <bluefeet@cpan.org>
269 bphillips: Brian Phillips <bphillips@cpan.org>
271 boghead: Bryan Beeley <cpan@beeley.org>
273 bricas: Brian Cassidy <bricas@cpan.org>
275 brunov: Bruno Vecchi <vecchi.b@gmail.com>
277 caelum: Rafael Kitover <rkitover@cpan.org>
279 caldrin: Maik Hentsche <maik.hentsche@amd.com>
281 castaway: Jess Robinson
283 claco: Christopher H. Laco
287 da5id: David Jack Olrik <djo@cpan.org>
289 debolaz: Anders Nor Berle <berle@cpan.org>
291 dew: Dan Thomas <dan@godders.org>
293 dkubb: Dan Kubb <dan.kubb-cpan@onautopilot.com>
295 dnm: Justin Wheeler <jwheeler@datademons.com>
297 dpetrov: Dimitar Petrov <mitakaa@gmail.com>
299 dwc: Daniel Westermann-Clark <danieltwc@cpan.org>
301 dyfrgi: Michael Leuchtenburg <michael@slashhome.org>
303 freetime: Bill Moseley <moseley@hank.org>
305 frew: Arthur Axel "fREW" Schmidt <frioux@gmail.com>
307 goraxe: Gordon Irving <goraxe@cpan.org>
309 gphat: Cory G Watson <gphat@cpan.org>
311 groditi: Guillermo Roditi <groditi@cpan.org>
313 Haarg: Graham Knop <haarg@haarg.org>
315 hobbs: Andrew Rodland <arodland@cpan.org>
317 ilmari: Dagfinn Ilmari MannsE<aring>ker <ilmari@ilmari.org>
319 initself: Mike Baas <mike@initselftech.com>
321 jawnsy: Jonathan Yu <jawnsy@cpan.org>
323 jasonmay: Jason May <jason.a.may@gmail.com>
327 jgoulah: John Goulah <jgoulah@cpan.org>
329 jguenther: Justin Guenther <jguenther@cpan.org>
331 jhannah: Jay Hannah <jay@jays.net>
333 jnapiorkowski: John Napiorkowski <jjn1056@yahoo.com>
335 jon: Jon Schutz <jjschutz@cpan.org>
337 jshirley: J. Shirley <jshirley@gmail.com>
339 kaare: Kaare Rasmussen
341 konobi: Scott McWhirter
343 littlesavage: Alexey Illarionov <littlesavage@orionet.ru>
345 lukes: Luke Saunders <luke.saunders@gmail.com>
347 marcus: Marcus Ramberg <mramberg@cpan.org>
349 mattlaw: Matt Lawrence
351 mattp: Matt Phillips <mattp@cpan.org>
353 michaelr: Michael Reddick <michael.reddick@gmail.com>
355 milki: Jonathan Chu <milki@rescomp.berkeley.edu>
357 ned: Neil de Carteret
359 nigel: Nigel Metheringham <nigelm@cpan.org>
361 ningu: David Kamholz <dkamholz@cpan.org>
363 Nniuq: Ron "Quinn" Straight" <quinnfazigu@gmail.org>
365 norbi: Norbert Buchmuller <norbi@nix.hu>
367 nuba: Nuba Princigalli <nuba@cpan.org>
369 Numa: Dan Sully <daniel@cpan.org>
371 ovid: Curtis "Ovid" Poe <ovid@cpan.org>
373 oyse: Øystein Torget <oystein.torget@dnv.com>
375 paulm: Paul Makepeace
377 penguin: K J Cheetham
379 perigrin: Chris Prather <chris@prather.org>
381 peter: Peter Collingbourne <peter@pcc.me.uk>
383 phaylon: Robert Sedlacek <phaylon@dunkelheit.at>
385 plu: Johannes Plunien <plu@cpan.org>
387 Possum: Daniel LeWarne <possum@cpan.org>
389 quicksilver: Jules Bean
391 rafl: Florian Ragwitz <rafl@debian.org>
393 rainboxx: Matthias Dietrich <perl@rb.ly>
395 rbo: Robert Bohne <rbo@cpan.org>
397 rbuels: Robert Buels <rmb32@cornell.edu>
399 rdj: Ryan D Johnson <ryan@innerfence.com>
401 ribasushi: Peter Rabbitson <ribasushi@cpan.org>
403 rjbs: Ricardo Signes <rjbs@cpan.org>
405 robkinyon: Rob Kinyon <rkinyon@cpan.org>
407 Roman: Roman Filippov <romanf@cpan.org>
409 Sadrak: Felix Antonius Wilhelm Ostmann <sadrak@cpan.org>
411 sc_: Just Another Perl Hacker
413 scotty: Scotty Allen <scotty@scottyallen.com>
415 semifor: Marc Mims <marc@questright.com>
417 solomon: Jared Johnson <jaredj@nmgi.com>
419 spb: Stephen Bennett <stephen@freenode.net>
421 Squeeks <squeek@cpan.org>
423 sszabo: Stephan Szabo <sszabo@bigpanda.com>
425 talexb: Alex Beamish <talexb@gmail.com>
427 tamias: Ronald J Kimball <rjk@tamias.net>
429 teejay : Aaron Trevena <teejay@cpan.org>
435 tonvoon: Ton Voon <tonvoon@cpan.org>
437 triode: Pete Gamache <gamache@cpan.org>
439 typester: Daisuke Murase <typester@cpan.org>
441 victori: Victor Igumnov <victori@cpan.org>
445 willert: Sebastian Willert <willert@cpan.org>
447 wreis: Wallace Reis <wreis@cpan.org>
449 yrlnry: Mark Jason Dominus <mjd@plover.com>
451 zamolxes: Bogdan Lucaciu <bogdan@wiz.ro>
455 Copyright (c) 2005 - 2010 the DBIx::Class L</AUTHOR> and L</CONTRIBUTORS>
460 This library is free software and may be distributed under the same terms