--- /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 Mysql, 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
+
+=head3 Create the database/tables and populate them with a few records
+
+ CREATE DATABASE cdtestdb ;
+ USE cdtestdb;
+
+ CREATE TABLE artist (
+ artistid INT NOT NULL AUTO_INCREMENT ,
+ name CHAR( 40 ) NOT NULL ,
+ PRIMARY KEY ( artistid )
+ );
+
+ CREATE TABLE cd (
+ cdid INT NOT NULL AUTO_INCREMENT ,
+ artist INT NOT NULL ,
+ title CHAR( 40 ) NOT NULL ,
+ PRIMARY KEY ( cdid )
+ );
+
+ CREATE TABLE track (
+ trackid INT NOT NULL AUTO_INCREMENT ,
+ cd INT NOT NULL ,
+ title CHAR( 40 ) NOT NULL ,
+ PRIMARY KEY ( trackid )
+ ;
+
+
+ INSERT INTO artist VALUES
+ (NULL,'Michael Jackson'),
+ (NULL,'Eminem');
+
+ INSERT INTO cd VALUES
+ (NULL,'1','Thriller'),
+ (NULL,'1','Bad'),
+ (NULL,'2','The Marshall Mathers LP');
+
+ INSERT INTO track VALUES
+ (NULL,'1','Beat it'),
+ (NULL,'1','Billie Jean'),
+ (NULL,'2','Dirty Diana'),
+ (NULL,'2','Smooth Criminal'),
+ (NULL,'2','Leave Me Alone'),
+ (NULL,'3','Stan'),
+ (NULL,'3','The Way I Am');
+
+
+
+=head3 Set up DBIx::Class::Schema
+
+First, create some dirs and change working directory:
+
+ mkdir app
+ mkdir app/DB
+ mkdir app/DB/Main
+ cd app
+
+
+Then, create the following DBIx::Class::Schema classes:
+
+DB/Main.pm:
+
+ package DB::Main;
+ use base qw/DBIx::Class::Schema/;
+ __PACKAGE__->load_classes(qw/Artist CD Track/);
+
+ 1;
+
+
+DB/Main/Artist.pm:
+
+ package DB::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' => 'DB::Main::CD');
+
+ 1;
+
+
+DB/Main/CD.pm:
+
+ package DB::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' => 'DB::Main::Artist');
+ __PACKAGE__->has_many('tracks' => 'DB::Main::Track');
+
+ 1;
+
+
+DB/Main/Track.pm:
+
+ package DB::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' => 'DB::Main::CD');
+
+ 1;
+
+
+=head3 Create and run the test script
+
+testdb.pl:
+
+ #!/usr/bin/perl -w
+
+ use DB::Main;
+ use strict;
+
+ my $schema = DB::Main->connect('dbi:mysql:cdtestdb', 'serval', 'TNOownage');
+
+ 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 AUTHOR
+
+ sc_
+
+=cut
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