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SQL> create table mje(mac varchar(10), comment varchar(10));
SQLRowCount returns -1
...
SQLRowCount returns -1
3 rows fetched
SQL>

perl -le 'use DBI; my $h = DBI->connect;nect; my $r = $h->selectall_ha
+shref(q/select * from mje/, "mac"); use Data::Dumper; print Dumper($r
+);'
$VAR1 = {
...
                      'mac' => '1226'
                    }
        };

perl -le 'use DBI; my $h = DBI->connect;nect; my $r = $h->selectall_ar
+rayref(q/select * from mje/); use Data::Dumper; print Dumper($r);'
$VAR1 = [
...
            'comment3'
          ]
        ];