DBD::Pg (version 3.16.3) returns EMPTY char columns as 'undef'

[Matthias Apitz]

Hello,

We're using the above DBD::Pg version on Linux together with PostgreSQL 15.1
On fetch empty char columns are returned as (Perl) 'undef'

                  while ( my @row_ary = $dba->FetchArray()) {
                       foreach my $i (0..$#row_ary) {
                                if ($row_ary[$i] eq undef)  {
                                        print $row_ary[1] . "\n";
                                        next;
                                }
                                ...
which later leads in our code to NULL values '\N' in the writing of a CSV-like 
export
files. Ofc NULL values in the database are something else as '' char
strings. 

How this must be distinguished with DBD::Pg?

Thanks

        matthias


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Matthias Apitz, ✉ g...@unixarea.de, http://www.unixarea.de/ +49-176-38902045
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