node.js mongodb javascript scoping confusion

Question

I\'m developing a express.js application, without mongoose.

What I\'m trying to do is, to encapsulate calls to mongodb inside a function, pass the function some paramete

Answer 1

Since the items are retrieved from MongoDB asynchronously, the function get_data needs to accept a callback that will be used to return the results. I believe you'll also need to explicitly open the database connection.

function get_data(callback) {
    ...

    db.open(function(err, db) {
        if (err) return callback(err);

        db.collection('test_collection', function(err, collection) {
            if (err) return callback(err);
            collection.find().toArray(callback);
        });
    });
}

get_data(function(err, items) {
    // handle error
    console.log(items);
});