DBIx::Class::Helper::ResultSet::OneRow - The first you always wanted
# note that this is normally a component for a ResultSet package MySchema::ResultSet::Person; use strict; use warnings; use parent 'DBIx::Class::ResultSet'; __PACKAGE__->load_components('Helper::ResultSet::OneRow'); sub person_named { $_[0]->search({ name => $_[1] })->one_row }
This component codifies an alternate version of "first" in DBIx::Class::ResultSet. In practical use, first allows a user to do something like the following:
first
my $rs = $schema->resultset('Foo')->search({ name => 'bar' }); my $first = $rs->first; my @rest; while (my $row = $rs->next) { push @rest, $row }
Problematically, if you call first without the while loop afterwards and you got back more than one row, you are leaving a cursor open. Depending on your database this could increase memory usage or cause errors with later queries.
Fundamentally the difference is that when you use one_row you are guaranteed to exhaust the underlying cursor.
one_row
Generally speaking, unless you are doing something unusual, one_row is a good default.
Limits the ResultSet to a single row, and then returns the matching result object. In case no rows match, undef is returned as normal.
undef
Thanks to Aran Clary Deltac (BLUEFEET) for initially writing this module, and thanks to ZipRecruiter for sponsoring that initial developmentl
Arthur Axel "fREW" Schmidt <frioux+cpan@gmail.com>
This software is copyright (c) 2015 by Arthur Axel "fREW" Schmidt.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install DBIx::Class::Helpers, copy and paste the appropriate command in to your terminal.
cpanm
cpanm DBIx::Class::Helpers
CPAN shell
perl -MCPAN -e shell install DBIx::Class::Helpers
For more information on module installation, please visit the detailed CPAN module installation guide.