+++ /dev/null
-package DBIx::Class::Storage::DBI::MultiColumnIn;
-
-use strict;
-use warnings;
-
-use base 'DBIx::Class::Storage::DBI';
-use mro 'c3';
-
-=head1 NAME
-
-DBIx::Class::Storage::DBI::MultiColumnIn - Storage component for RDBMS supporting multicolumn in clauses
-
-=head1 DESCRIPTION
-
-While ANSI SQL does not define a multicolumn in operator, many databases can
-in fact understand WHERE (cola, colb) IN ( SELECT subcol_a, subcol_b ... )
-The storage class for any such RDBMS should inherit from this class, in order
-to dramatically speed up update/delete operations on joined multipk resultsets.
-
-At this point the only overridden method is C<_multipk_update_delete()>
-
-=cut
-
-sub _multipk_update_delete {
- my $self = shift;
- my ($rs, $op, $values) = @_;
-
- my $rsrc = $rs->result_source;
- my @pcols = $rsrc->_pri_cols;
- my $attrs = $rs->_resolved_attrs;
-
- # naive check - this is an internal method after all, we should know what we are doing
- $self->throw_exception ('Number of columns selected by supplied resultset does not match number of primary keys')
- if ( ref $attrs->{select} ne 'ARRAY' or @{$attrs->{select}} != @pcols );
-
- # This is hideously ugly, but SQLA does not understand multicol IN expressions
- my $sqla = $self->_sql_maker;
- my ($sql, @bind) = @${$rs->as_query};
- $sql = sprintf ('(%s) IN %s', # the as_query stuff is already enclosed in ()s
- join (', ', map { $sqla->_quote ($_) } @pcols),
- $sql,
- );
-
- return $self->$op (
- $rsrc,
- $op eq 'update' ? $values : (),
- \[$sql, @bind],
- );
-
-}
-
-=head1 AUTHORS
-
-See L<DBIx::Class/CONTRIBUTORS>
-
-=head1 LICENSE
-
-You may distribute this code under the same terms as Perl itself.
-
-=cut
-
-1;