for ('mysql', $db)
{ my $sth = $dbh->prepare("show tables from $_");
  $sth->execute();
  while (my $table = $sth->fetchrow_arrayref())
  { $table = $table->[0];
    my $filename = "save_db_$_/$table.sql";
    open FILE, "> $filename" or die "open $filename\n$!\n";
    my $sth = $dbh->prepare("show create table $_.$table");
    $sth->execute();
    while (my $create = $sth->fetchrow_arrayref())
    { print "$_.$create->[0]\n";
      $create = $create->[1];
      print FILE
        "use $_;\n",
        "$create;\n"
      or die "print $filename\n$!\n";
    }
    $sth->finish();
    $sth = $dbh->prepare("select * from $_.$table");
    $sth->execute();
    while (my $value = $sth->fetchrow_arrayref())
    { print FILE
        "insert into $table ("
       .join(',', @{$sth->{NAME}})
       .") values ("
#     .join(',', map $dbh->quote($_), @$value)   # das Problem
       .join(',', map mysql_quote($_), @$value)   # so funktioniert's
       .");\n"
      or die "print $filename\n$!\n";
    }
    $sth->finish();
    close FILE or die "close $filename\n$!\n";
  }
  $sth->finish();
}
$dbh->disconnect();