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foreach my $line (@lines) {
        $sth->execute($line, $line) or die "Can't execute SQL statemen
+t: $DBI::errstr\n";
...
        }
}

my @sorted = map {$_->[0]} sort {$a->[1] <=> $b->[1] ||
             $a->[2] <=> $b->[2] || $a->[3] <=> $b->[3] ||
             $a->[4] <=> $b->[4]} map {
             [$_, split(/\./, (split /\s+/, $_)[1])]} @lines;
print "$_\n" for @{$row_ref};