NAME¶
DBIx::SearchBuilder::Unique - Ensure uniqueness of records in a collection
SYNOPSIS¶
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
}
DESCRIPTION¶
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.
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.