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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
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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 %][[% num %]][% END %]
\& [% END %]
\&
\& ### navigation like: prev 20 | next 20
\& [% IF pager.previous_page %]
\&
\& prev [% pager.entries_per_page %] |
\& [% END %]
\& [% IF pager.next_page %]
\&
\& next [% pager.entries_per_page %]
\& [% 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
.PP
Original idea by Tomohiro Ikebe
.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