I'm trying to create a custom "mongodb perl wrapper". I created the following perl module, which local on my machine runs. My questions to the community are:

  • Would you create the module different?
  • Do you have improvements or adaptations to create the module better?


package MyMongo;

use strict;
use Exporter;
use MongoDB;

$VERSION     = 1.00;
@ISA         = qw(Exporter);
@EXPORT      = qw();
@EXPORT_OK   = qw();
%EXPORT_TAGS = ( DEFAULT => [qw()],
                 Both    => [qw()]);

sub new {
    my ($class, $args) = @_;
    my $self = {
        host     => $args->{host} || 'localhost',       
        port     => $args->{port} || '27017',
        database => $args->{database} || '',
        connection => $class->_set_connection(),
    return bless $self, $class;

sub _set_connection {
    my $self = shift;
    my $client = MongoDB->connect('mongodb://localhost');
    return $client;

sub get_database_names {
    # Lists all databases on the mongo server
    my $self = shift;
    return  $self->{connection}->database_names;

sub get_database {
    # Returns a MongoDB::Database instance for database with the given $name
    my ($self, $dbname) = @_;
    return $self->{connection}->get_database($dbname);

sub authenticate {
    my ($self, $args) = @_;
    $self = {
        dbname => $args->{dbname},
        user => $args->{user},
        password => $args->{password}
    $self->{connection}->authenticate($self->{dbname}, $self->{user}, $self->{password});
  • 1
    \$\begingroup\$ Plagiarised here: perlmonks.org/?node_id=1198825 \$\endgroup\$ – choroba Sep 7 '17 at 18:32
  • \$\begingroup\$ Thanks @choroba for the hint. Yes your are right, the guy has stolen my part of code i had wrote. \$\endgroup\$ – Patrick85 Sep 8 '17 at 21:13
  • \$\begingroup\$ @Patrick85 May I ask why did you delete this? \$\endgroup\$ – Ludisposed Dec 22 '17 at 10:27
  • \$\begingroup\$ The process for asking for deletion of an answered question is described in meta.stackexchange.com/a/5222/213556 \$\endgroup\$ – Simon Forsberg Dec 22 '17 at 11:29
  • \$\begingroup\$ There is an intention that people may come across this years in the future, and so you aren't always allowed to delete your posts (without reasoning with a moderator) or allowed to deface the website by editing your question such as you have done. Basically while you may not need the information here, leaving it may still be a benefit for others. \$\endgroup\$ – Brad Gilbert Dec 22 '17 at 14:52

I'm the lead engineer for the MongoDB Perl driver with a couple of thoughts for you:

  • you're using 'authenticate', which is for a very old version of the driver which is not recommended for use. In the v1.x series, you should provide username/password in the URI or in MongoClient parameters.
  • Most of the value of this module seems to be setting parameters and calling connect. I would suggest doing that with a function, not a module and then just using the resulting MongoDB::MongoClient object directly.
  • \$\begingroup\$ Thanks for your hint. I will change my wrapper to work with MongoDB::MongoClient. After Iam ready i will show erverybody my wrapper. Thanks \$\endgroup\$ – Patrick85 May 18 '17 at 14:11

Please check comments in the code,

# package using block, convenient but not mandatory
package MyMongo {

    use strict;
    # as it seems you just need import() from Exporter module
    use Exporter 'import';
    use MongoDB;

    # use vars qw(..) works for older perl, but since 5.6 "our" is preferred
    our $VERSION     = 1.00;
    # it seems you don't actually want to be child of Exporter, so no parent class
    our @ISA         = qw();
    our @EXPORT      = qw();
    our @EXPORT_OK   = qw();
    our %EXPORT_TAGS = ( DEFAULT => [qw()],
                     Both    => [qw()]);

    sub new {
        my ($class, $args) = @_;
        my %defaults = (
            host     => 'localhost',       
            port     => '27017',
            database => '',
        my $self = bless({ %defaults, %$args }, $class);

        $self->{connection} = $self->_set_connection();
        return $self;

    # ...


More suggestions in perldoc Exporter


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