+++ /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', 'testuser', 'testpass');
-
- 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
projects / dbsrgits/DBIx-Class.git / commitdiff