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# $Id$
# Contributor(s): Xiaoou Wu <xiaoou.wu@oracle.com>
#
package Data::ObjectDriver::SQL::Oracle;
use strict;
use base qw(Data::ObjectDriver::SQL);
## Oracle doesn't have the LIMIT clause.
sub as_limit {
return '';
}
## Override as_sql to emulate the LIMIT clause.
sub as_sql {
my $stmt = shift;
my $limit = $stmt->limit;
my $offset = $stmt->offset;
if (defined $limit && defined $offset) {
my @fields = $stmt->select;
push @fields, "ROW_NUMBER() OVER (ORDER BY 1) R";
}
my $sql = $stmt->SUPER::as_sql(@_);
if (defined $limit) {
$sql = "SELECT * FROM ( $sql ) WHERE ";
if (defined $offset) {
$sql = $sql . " R BETWEEN $offset + 1 AND $limit + $offset";
} else {
$sql = $sql . " rownum <= $limit";
}
}
return $sql;
}
1;
__END__
=head1 NAME
Data::ObjectDriver::SQL::Oracle - an SQL statement for Oracle
=head1 DESCRIPTION
This module overrides methods of the Data::ObjectDriver::SQL module
with Oracle specific implementation.
=head1 LICENSE
This module is free software;
you may redistribute and/or modify it under the same
terms as Perl itself.
=head1 AUTHOR & COPYRIGHT
This module is
copyright (c) 2009 Xiaoou Wu E<lt>xiaoou.wu@oracle.comE<gt>.
All rights reserved.
=cut
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