/usr/share/perl5/Class/DBI/Pager.pm is in libclass-dbi-pager-perl 0.08-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | package Class::DBI::Pager;
use strict;
use vars qw($VERSION $AUTOLOAD);
$VERSION = 0.08;
use Class::DBI 0.90;
use Data::Page;
sub import {
my $class = shift;
my $pkg = caller(0);
no strict 'refs';
*{"$pkg\::pager"} = \&_pager;
}
sub _croak { require Carp; Carp::croak(@_); }
sub _pager {
my($pkg, $entry, $curr) = @_;
bless {
pkg => $pkg,
entry => $entry,
curr => $curr,
pager => undef,
}, __PACKAGE__;
}
BEGIN {
my @methods = qw(total_entries entries_per_page current_page entries_on_this_page
first_page last_page first last previous_page next_page pages_in_navigation);
for my $method (@methods) {
no strict 'refs';
*$method = sub {
my $self = shift;
$self->{pager} or _croak("Can't call pager methods without searching");
$self->{pager}->$method(@_);
};
}
}
sub DESTROY { }
sub AUTOLOAD {
my $self = shift;
(my $method = $AUTOLOAD) =~ s/.*://;
if (ref($self) && $self->{pkg}->can($method)) {
my $iter = $self->{pkg}->$method(@_);
UNIVERSAL::isa($iter, 'Class::DBI::Iterator')
or _croak("$method doesn't return Class::DBI::Itertor");
my $pager = $self->{pager} = Data::Page->new(
$iter->count, $self->{entry}, $self->{curr},
);
return $iter->slice($pager->first-1, $pager->last-1);
}
else {
_croak(qq(Can't locate object method "$method" via package ) . ref($self) || $self);
}
}
1;
__END__
=head1 NAME
Class::DBI::Pager - Pager utility for Class::DBI
=head1 SYNOPSIS
package CD;
use base qw(Class::DBI);
__PACKAGE__->set_db(...);
use Class::DBI::Pager; # just use it
# then, in client code!
package main;
use CD;
my $pager = CD->pager(20, 1); # ($items_per_page, $current_page)
my @disks = $pager->retrieve_all;
=head1 DESCRIPTION
Class::DBI::Pager is a plugin for Class::DBI, which glues Data::Page
with Class::DBI. This module reduces your work a lot, for example when
you have to do something like:
* retrieve objects from a database
* display objects with 20 items per page
In addition, your work will be reduced more, when you use
Template-Toolkit as your templating engine. See L</"EXAMPLE"> for
details.
=head1 EXAMPLE
# Controller: (MVC's C)
my $query = CGI->new;
my $template = Template->new;
my $pager = Film->pager(20, $query->param('page') || 1);
my $movies = $pager->retrieve_all;
$template->process($input, {
movies => $movies,
pager => $pager,
});
# View: (MVC's V)
Matched [% pager.total_entries %] items.
[% WHILE (movie = movies.next) %]
Title: [% movie.title | html %]
[% END %]
### navigation like: [1] [2] [3]
[% FOREACH num = [pager.first_page .. pager.last_page] %]
[% IF num == pager.current_page %][[% num %]]
[% ELSE %]<a href="display?page=[% num %]">[[% num %]]</a>[% END %]
[% END %]
### navigation like: prev 20 | next 20
[% IF pager.previous_page %]
<a href="display?page=[% pager.previous_page %]">
prev [% pager.entries_per_page %]</a> |
[% END %]
[% IF pager.next_page %]
<a href="display?page=[% pager.next_page %]">
next [% pager.entries_per_page %]</a>
[% END %]
=head1 NOTE / TODO
This modules internally retrieves itertors, then creates C<Data::Page>
object for paging utility. Using SQL clauses C<LIMIT> and/or C<OFFSET>
with C<DBIx::Pager> might be more memory efficient.
=head1 AUTHOR
Tatsuhiko Miyagawa E<lt>miyagawa@bulknews.netE<gt>
Original idea by Tomohiro Ikebe E<lt>ikebe@cpan.orgE<gt>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=head1 SEE ALSO
L<Class::DBI>, L<Data::Page>
=cut
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