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#!/usr/bin/perl -w
use MyDatabase::Main;
use strict;
my $schema = MyDatabase::Main->connect('dbi:SQLite:db/example.db');
# for other DSNs, e.g. MySql, see the perldoc for the relevant dbd
# driver, e.g perldoc L<DBD::mysql>.
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";
}
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