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.IX Title "Class::DBI::Pager 3pm"
.TH Class::DBI::Pager 3pm "2018-02-10" "perl v5.26.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Class::DBI::Pager \- Pager utility for Class::DBI
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&  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;
.Ve
.SH "DESCRIPTION"
.IX Header "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:
.PP
.Vb 2
\&  * retrieve objects from a database
\&  * display objects with 20 items per page
.Ve
.PP
In addition, your work will be reduced more, when you use
Template-Toolkit as your templating engine. See \*(L"\s-1EXAMPLE\*(R"\s0 for
details.
.SH "EXAMPLE"
.IX Header "EXAMPLE"
.Vb 3
\&  # Controller: (MVC\*(Aqs C)
\&  my $query    = CGI\->new;
\&  my $template = Template\->new;
\&
\&  my $pager    = Film\->pager(20, $query\->param(\*(Aqpage\*(Aq) || 1);
\&  my $movies   = $pager\->retrieve_all;
\&  $template\->process($input, {
\&      movies => $movies,
\&      pager  => $pager,
\&  });
\&
\&  # View: (MVC\*(Aqs 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 %]
.Ve
.SH "NOTE / TODO"
.IX Header "NOTE / TODO"
This modules internally retrieves itertors, then creates \f(CW\*(C`Data::Page\*(C'\fR
object for paging utility. Using \s-1SQL\s0 clauses \f(CW\*(C`LIMIT\*(C'\fR and/or \f(CW\*(C`OFFSET\*(C'\fR
with \f(CW\*(C`DBIx::Pager\*(C'\fR might be more memory efficient.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tatsuhiko Miyagawa <miyagawa@bulknews.net>
.PP
Original idea by Tomohiro Ikebe <ikebe@cpan.org>
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Class::DBI, Data::Page