+++ /dev/null
-=head1 NAME
-
-DBIx::Class::Manual::Example - Simple CD database example
-
-=head1 DESCRIPTION
-
-This tutorial will guide you through the proeccess of setting up and
-testing a very basic CD database using SQLite, with DBIx::Class::Schema
-as the database frontend.
-
-The database consists of the following:
-
- table 'artist' with columns: artistid, name
- table 'cd' with columns: cdid, artist, title
- table 'track' with columns: trackid, cd, title
-
-
-And these rules exists:
-
- one artist can have many cds
- one cd belongs to one artist
- one cd can have many tracks
- one track belongs to one cd
-
-
-=head2 Installation
-
-Install DBIx::Class via CPAN should be sufficient.
-
-=head3 Create the database/tables.
-
-First make and change the directory:
-
- mkdir app
- cd app
-
-This example uses SQLite which is a dependency of DBIx::Class, so you
-shouldn't have to install extra software.
-
-Save the following into a example.sql
-
- CREATE TABLE artist (
- artistid INTEGER PRIMARY KEY,
- name TEXT NOT NULL
- );
-
- CREATE TABLE cd (
- cdid INTEGER PRIMARY KEY,
- artist INTEGER NOT NULL REFERENCES artist(artistid),
- title TEXT NOT NULL);
-
- CREATE TABLE track (
- trackid INTEGER PRIMARY KEY,
- cd INTEGER NOT NULL REFERENCES cd(cdid),
- title TEXT NOT NULL) ;
-
-and create the sqlite database file:
-
-sqlite3 example.db < example.sql
-
-=head3 Set up DBIx::Class::Schema
-
-First, create some dirs and change working directory:
-
- mkdir MyDatabase
- mkdir MyDatabase/Main
-
-Then, create the following DBIx::Class::Schema classes:
-
-MyDatabase/Main.pm:
-
- package MyDatabase::Main;
- use base qw/DBIx::Class::Schema/;
- __PACKAGE__->load_classes(qw/Artist Cd Track/);
-
- 1;
-
-
-MyDatabase/Main/Artist.pm:
-
- package MyDatabase::Main::Artist;
- use base qw/DBIx::Class/;
- __PACKAGE__->load_components(qw/Core/);
- __PACKAGE__->table('artist');
- __PACKAGE__->add_columns(qw/ artistid name /);
- __PACKAGE__->set_primary_key('artistid');
- __PACKAGE__->has_many('cds' => 'MyDatabase::Main::Cd');
-
- 1;
-
-
-MyDatabase/Main/Cd.pm:
-
- package MyDatabase::Main::Cd;
- use base qw/DBIx::Class/;
- __PACKAGE__->load_components(qw/Core/);
- __PACKAGE__->table('cd');
- __PACKAGE__->add_columns(qw/ cdid artist title/);
- __PACKAGE__->set_primary_key('cdid');
- __PACKAGE__->belongs_to('artist' => 'MyDatabase::Main::Artist');
- __PACKAGE__->has_many('tracks' => 'MyDatabase::Main::Track');
-
- 1;
-
-
-MyDatabase/Main/Track.pm:
-
- package MyDatabase::Main::Track;
- use base qw/DBIx::Class/;
- __PACKAGE__->load_components(qw/Core/);
- __PACKAGE__->table('track');
- __PACKAGE__->add_columns(qw/ trackid cd title/);
- __PACKAGE__->set_primary_key('trackid');
- __PACKAGE__->belongs_to('cd' => 'MyDatabase::Main::Cd');
-
- 1;
-
-
-=head3 Write a script to insert some records.
-
-insertdb.pl
-
- #!/usr/bin/perl -w
-
- use MyDatabase::Main;
- use strict;
-
- my $schema = MyDatabase::Main->connect('dbi:SQLite:example.db');
-
- # here's some of the sql that is going to be generated by the schema
- # INSERT INTO artist VALUES (NULL,'Michael Jackson');
- # INSERT INTO artist VALUES (NULL,'Eminem');
-
- my @artists = (['Michael Jackson'], ['Eminem']);
- $schema->populate('Artist', [
- [qw/name/],
- @artists,
- ]);
-
- my %albums = (
- 'Thriller' => 'Michael Jackson',
- 'Bad' => 'Michael Jackson',
- 'The Marshall Mathers LP' => 'Eminem',
- );
-
- my @cds;
- foreach my $lp (keys %albums) {
- my $artist = $schema->resultset('Artist')->search({
- name => $albums{$lp}
- });
- push @cds, [$lp, $artist->first];
- }
-
- $schema->populate('Cd', [
- [qw/title artist/],
- @cds,
- ]);
-
-
- my %tracks = (
- 'Beat It' => 'Thriller',
- 'Billie Jean' => 'Thriller',
- 'Dirty Diana' => 'Bad',
- 'Smooth Criminal' => 'Bad',
- 'Leave Me Alone' => 'Bad',
- 'Stan' => 'The Marshall Mathers LP',
- 'The Way I Am' => 'The Marshall Mathers LP',
- );
-
- my @tracks;
- foreach my $track (keys %tracks) {
- my $cdname = $schema->resultset('Cd')->search({
- title => $tracks{$track},
- });
- push @tracks, [$cdname->first, $track];
- }
-
- $schema->populate('Track',[
- [qw/cd title/],
- @tracks,
- ]);
-
-=head3 Create and run the scripts
-
-testdb.pl:
-
- #!/usr/bin/perl -w
-
- use MyDatabase::Main;
- use strict;
-
- my $schema = MyDatabase::Main->connect('dbi:SQLite:example.db');
-
- get_tracks_by_cd('Bad');
- get_tracks_by_artist('Michael Jackson');
-
- get_cd_by_track('Stan');
- get_cds_by_artist('Michael Jackson');
-
- get_artist_by_track('Dirty Diana');
- get_artist_by_cd('The Marshall Mathers LP');
-
-
- sub get_tracks_by_cd {
- my $cdtitle = shift;
- print "get_tracks_by_cd($cdtitle):\n";
- my $rs = $schema->resultset('Track')->search(
- {
- 'cd.title' => $cdtitle
- },
- {
- join => [qw/ cd /],
- prefetch => [qw/ cd /]
- }
- );
- while (my $track = $rs->next) {
- print $track->title . "\n";
- }
- print "\n";
- }
-
- sub get_tracks_by_artist {
- my $artistname = shift;
- print "get_tracks_by_artist($artistname):\n";
- my $rs = $schema->resultset('Track')->search(
- {
- 'artist.name' => $artistname
- },
- {
- join => {
- 'cd' => 'artist'
- },
- }
- );
- while (my $track = $rs->next) {
- print $track->title . "\n";
- }
- print "\n";
- }
-
-
-
- sub get_cd_by_track {
- my $tracktitle = shift;
- print "get_cd_by_track($tracktitle):\n";
- my $rs = $schema->resultset('Cd')->search(
- {
- 'tracks.title' => $tracktitle
- },
- {
- join => [qw/ tracks /],
- }
- );
- my $cd = $rs->first;
- print $cd->title . "\n\n";
- }
-
- sub get_cds_by_artist {
- my $artistname = shift;
- print "get_cds_by_artist($artistname):\n";
- my $rs = $schema->resultset('Cd')->search(
- {
- 'artist.name' => $artistname
- },
- {
- join => [qw/ artist /],
- prefetch => [qw/ artist /]
- }
- );
- while (my $cd = $rs->next) {
- print $cd->title . "\n";
- }
- print "\n";
- }
-
-
-
- sub get_artist_by_track {
- my $tracktitle = shift;
- print "get_artist_by_track($tracktitle):\n";
- my $rs = $schema->resultset('Artist')->search(
- {
- 'tracks.title' => $tracktitle
- },
- {
- join => {
- 'cds' => 'tracks'
- }
- }
- );
- my $artist = $rs->first;
- print $artist->name . "\n\n";
- }
-
- sub get_artist_by_cd {
- my $cdtitle = shift;
- print "get_artist_by_cd($cdtitle):\n";
- my $rs = $schema->resultset('Artist')->search(
- {
- 'cds.title' => $cdtitle
- },
- {
- join => [qw/ cds /],
- }
- );
- my $artist = $rs->first;
- print $artist->name . "\n\n";
- }
-
-
-
-It should output:
-
- get_tracks_by_cd(Bad):
- Dirty Diana
- Smooth Criminal
- Leave Me Alone
-
- get_tracks_by_artist(Michael Jackson):
- Beat it
- Billie Jean
- Dirty Diana
- Smooth Criminal
- Leave Me Alone
-
- get_cd_by_track(Stan):
- The Marshall Mathers LP
-
- get_cds_by_artist(Michael Jackson):
- Thriller
- Bad
-
- get_artist_by_track(Dirty Diana):
- Michael Jackson
-
- get_artist_by_cd(The Marshall Mathers LP):
- Eminem
-
-=head1 Notes
-
-With these scripts we're relying on @INC looking in the current
-working directory. You may want to add the MyDatabase namespaces to
-@INC in a different way when it comes to deployemnt.
-
-The testdb.pl script is an excellent start for testing your database
-model.
-
-=head1 TODO
-
-=head1 AUTHOR
-
- sc_ from irc.perl.org#dbix-class
- Kieren Diment <kd@totaldatasolution.com>
-
-=cut
projects / dbsrgits/DBIx-Class.git / commitdiff