I am trying to convert Oracle SQL query output to XML. I'm sure someone has tackled this issue previous to me.

I am using the following code to write an XML file:-

   $SelectStatement=$SQL->get($StmntTsk{Def},$StmntTsk{Args}) or throw
TNBCriticalException("Cannot get SELECT SQL from Phrasebook");
    my $XmlOutFile = $fqd_runlogdir.$MSTR::DLM.$StmntTsk{XMLOutput};
    my $ya = XML::Handler::YAWriter->new(AsFile => $XmlOutFile);
    my $generator = XML::Generator::DBI->new(
                        Handler => $ya, 
                        dbh => $dbh,
                        ShowColumns => True
                        );
    $generator->execute($SelectStatement);
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Problem is when I have NULL entries in a database column I get no XML element - when what I want is an empty element. This is because I sometimes want to manipulate the XML into CSV and to have it formatted correctly it needs a comma for each NULL - which I cant do unless I can process a Node in the nodeset via XSL.

Now I know I could change my SQL to wrap these columns with NVL but I thought there might be a way with DBD/Perl to process the NULL's and maintain the elements