From: Matt S Trout Date: Fri, 24 Mar 2006 21:28:19 +0000 (+0000) Subject: Fixed indent in Example.pod X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=90efcf9497adb3d00a607e33835c23403b1d9741;p=dbsrgits%2FDBIx-Class-Historic.git Fixed indent in Example.pod --- diff --git a/lib/DBIx/Class/Manual/Example.pod b/lib/DBIx/Class/Manual/Example.pod index b56f85e..16f4185 100644 --- a/lib/DBIx/Class/Manual/Example.pod +++ b/lib/DBIx/Class/Manual/Example.pod @@ -10,17 +10,17 @@ 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 + 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 + 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 @@ -31,28 +31,28 @@ Install DBIx::Class via CPAN should be sufficient. First make and change the directory: - mkdir app - cd app + 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 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 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) ; + CREATE TABLE track ( + trackid INTEGER PRIMARY KEY, + cd INTEGER NOT NULL REFERENCES cd(cdid), + title TEXT NOT NULL) ; and create the sqlite database file: @@ -62,279 +62,279 @@ sqlite3 example.db < example.sql First, create some dirs and change working directory: - mkdir MyDatabase - mkdir MyDatabase/Main + 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/); + + package MyDatabase::Main; + use base qw/DBIx::Class::Schema/; + __PACKAGE__->load_classes(qw/Artist Cd Track/); - 1; + 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'); + 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; + 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'); + 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; + 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'); + 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; + 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, - ]); + #!/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 - }, - { + #!/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"; - } + } + } + ); + 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_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_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_cd_by_track(Stan): + The Marshall Mathers LP - get_cds_by_artist(Michael Jackson): - Thriller - Bad + get_cds_by_artist(Michael Jackson): + Thriller + Bad - get_artist_by_track(Dirty Diana): - Michael Jackson + get_artist_by_track(Dirty Diana): + Michael Jackson - get_artist_by_cd(The Marshall Mathers LP): - Eminem + get_artist_by_cd(The Marshall Mathers LP): + Eminem =head1 Notes