table of contents
Jifty::DBI::Collection::Unique(3pm) | User Contributed Perl Documentation | Jifty::DBI::Collection::Unique(3pm) |
add_record¶
Overrides add_record to ensure uniqueness.
NAME¶
Jifty::DBI::Collection::Unique - Ensure uniqueness of records in a collection
SYNOPSIS¶
package Foo::Collection; use base 'Jifty::DBI::Collection'; use Jifty::DBI::Collection::Unique; # mixin my $collection = Foo::Collection->New(); $collection->SetupComplicatedJoins; $collection->OrderByMagic; while (my $thing = $collection->Next) { # $thing is going to be distinct }
DESCRIPTION¶
Currently, Jifty::DBI makes exceptions for databases which cannot handle both "SELECT DISTINCT" and ordering in the same statement; it drops the "DISTINCT" requirement. This, of course, means that you can get the same row twice, which you might not want. If that's the case, use this module as a mix-in, and it will provide you with an "AddRecord" method which ensures that a record will not appear twice in the same search.
AUTHOR¶
Simon Cozens.
COPYRIGHT¶
Copyright 2005 Best Practical Solutions, LLC
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
2022-06-15 | perl v5.34.0 |