DBIx::SearchBuilder::Unique - Ensure uniqueness of records in a collection
package Foo::Collection;
use base 'DBIx::SearchBuilder';
use DBIx::SearchBuilder::Unique; # mixin
my $collection = Foo::Collection->New();
$collection->SetupComplicatedJoins;
$collection->OrderByMagic;
while (my $thing = $collection->Next) {
# $thing is going to be distinct
}
Currently, DBIx::SearchBuilder 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.
Simon Cozens.
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.