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1 | #!/usr/bin/env perl |
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2 | |
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3 | use warnings; |
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4 | use strict; |
5 | |
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6 | use MyDatabase::Main; |
7 | |
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8 | my $schema = MyDatabase::Main->connect('dbi:SQLite:db/example.db'); |
9 | # for other DSNs, e.g. MySql, see the perldoc for the relevant dbd |
10 | # driver, e.g perldoc L<DBD::mysql>. |
11 | |
12 | get_tracks_by_cd('Bad'); |
13 | get_tracks_by_artist('Michael Jackson'); |
14 | |
15 | get_cd_by_track('Stan'); |
16 | get_cds_by_artist('Michael Jackson'); |
17 | |
18 | get_artist_by_track('Dirty Diana'); |
19 | get_artist_by_cd('The Marshall Mathers LP'); |
20 | |
21 | |
22 | sub get_tracks_by_cd { |
23 | my $cdtitle = shift; |
24 | print "get_tracks_by_cd($cdtitle):\n"; |
25 | my $rs = $schema->resultset('Track')->search( |
26 | { |
27 | 'cd.title' => $cdtitle |
28 | }, |
29 | { |
30 | join => [qw/ cd /], |
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31 | } |
32 | ); |
33 | while (my $track = $rs->next) { |
34 | print $track->title . "\n"; |
35 | } |
36 | print "\n"; |
37 | } |
38 | |
39 | sub get_tracks_by_artist { |
40 | my $artistname = shift; |
41 | print "get_tracks_by_artist($artistname):\n"; |
42 | my $rs = $schema->resultset('Track')->search( |
43 | { |
44 | 'artist.name' => $artistname |
45 | }, |
46 | { |
47 | join => { |
48 | 'cd' => 'artist' |
49 | }, |
50 | } |
51 | ); |
52 | while (my $track = $rs->next) { |
53 | print $track->title . "\n"; |
54 | } |
55 | print "\n"; |
56 | } |
57 | |
58 | |
59 | sub get_cd_by_track { |
60 | my $tracktitle = shift; |
61 | print "get_cd_by_track($tracktitle):\n"; |
62 | my $rs = $schema->resultset('Cd')->search( |
63 | { |
64 | 'tracks.title' => $tracktitle |
65 | }, |
66 | { |
67 | join => [qw/ tracks /], |
68 | } |
69 | ); |
70 | my $cd = $rs->first; |
71 | print $cd->title . "\n\n"; |
72 | } |
73 | |
74 | sub get_cds_by_artist { |
75 | my $artistname = shift; |
76 | print "get_cds_by_artist($artistname):\n"; |
77 | my $rs = $schema->resultset('Cd')->search( |
78 | { |
79 | 'artist.name' => $artistname |
80 | }, |
81 | { |
82 | join => [qw/ artist /], |
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83 | } |
84 | ); |
85 | while (my $cd = $rs->next) { |
86 | print $cd->title . "\n"; |
87 | } |
88 | print "\n"; |
89 | } |
90 | |
91 | |
92 | |
93 | sub get_artist_by_track { |
94 | my $tracktitle = shift; |
95 | print "get_artist_by_track($tracktitle):\n"; |
96 | my $rs = $schema->resultset('Artist')->search( |
97 | { |
98 | 'tracks.title' => $tracktitle |
99 | }, |
100 | { |
101 | join => { |
102 | 'cds' => 'tracks' |
103 | } |
104 | } |
105 | ); |
106 | my $artist = $rs->first; |
107 | print $artist->name . "\n\n"; |
108 | } |
109 | |
110 | |
111 | sub get_artist_by_cd { |
112 | my $cdtitle = shift; |
113 | print "get_artist_by_cd($cdtitle):\n"; |
114 | my $rs = $schema->resultset('Artist')->search( |
115 | { |
116 | 'cds.title' => $cdtitle |
117 | }, |
118 | { |
119 | join => [qw/ cds /], |
120 | } |
121 | ); |
122 | my $artist = $rs->first; |
123 | print $artist->name . "\n\n"; |
124 | } |