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.\"
.IX Title "DBIx::SearchBuilder::Unique 3pm"
.TH DBIx::SearchBuilder::Unique 3pm "2021-01-24" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
DBIx::SearchBuilder::Unique \- Ensure uniqueness of records in a collection
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    package Foo::Collection;
\&    use base \*(AqDBIx::SearchBuilder\*(Aq;
\&
\&    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
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Currently, DBIx::SearchBuilder makes exceptions for databases which
cannot handle both \f(CW\*(C`SELECT DISTINCT\*(C'\fR and ordering in the same
statement; it drops the \f(CW\*(C`DISTINCT\*(C'\fR 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
\&\f(CW\*(C`AddRecord\*(C'\fR method which ensures that a record will not appear twice in
the same search.
.SH "AUTHOR"
.IX Header "AUTHOR"
Simon Cozens.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2005 Best Practical Solutions, \s-1LLC\s0
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.