peterzawistowicz

    my $client = MongoDB->connect();
    my $coll = $client->ns("test.foo");

    # do insert with number-like strings inserted as numbers
    {
        my $coll2 = $coll->with_codec( prefer_numeric => 1 );
        $coll2->insert( answer => "42" ); # inserted as numeric 42
    }

peterzawistowicz

    my $client = MongoDB->connect();
    my $coll = $client->ns("test.foo");

    # do insert with w:majority
    {
        my $coll2 = $coll->clone( write_concern => { w => 'majority' } );
        $coll2->insert( $doc );
    }

peterzawistowicz

    # WRONG WAY IS FATAL
    $client = MongoDB->connect()
    $client->authenticate("foo", "username", "sekret");

    # RIGHT WAY
    $client = MongoDB->connect("mongodb://username:sekret@localhost/foo");

peterzawistowicz

    my $client = MongoDB->connect();
    my $coll = $client->ns("test.foo");

    # assume first operation fails due to network error
    eval {
        $coll->insert( $doc );
    };
    warn $@ if $@;

    # next operation automatically reconnects to MongoDB

peterzawistowicz

    # RIGHT WAY
    my $client = MongoDB->connect();
    eval {
        # do work
    };
    if ( $@ ) {
        die "Error doing work: $@";
    }

peterzawistowicz

    # WRONG WAY
    my $client;
    if ( eval { $client = MongoDB->connect() } ) {
        # do work
    }
    else {
        die "MongoDB not available!";
    }

peterzawistowicz

    # REPLICA SET	(discovers other nodes)
    my $client = MongoDB->connect(
        "mongodb://h1.example.com/?replicaSet=myset"
    );

    # DIRECT CONNECTION
    my $direct = MongoDB->connect(
        "mongodb://h1.example.com/"
    );

peterzawistowicz

use MongoDB;

    # OLD WAY
    my $client = MongoDB::MongoClient->new(
      host => "mongodb://h1.example.com/"
    );

    # NEW WAY
    my $client = MongoDB->connect("mongodb://h1.example.com/");

peterzawistowicz

db.collection(‘docs’).find({a:1}).limit(1).skip(100).toArray(function(err, docs) {
  console.dir(err);
  console.dir(docs);
});

peterzawistowicz

{ itemId: 2, recom: [ { itemId: 32, weight: 36}, 
	                    { itemId: 158, weight: 23},
                     	  … ] }