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copied!<p>I made a very simple module <a href="https://github.com/baryshev/hub" rel="nofollow">hub</a> for this case that replaces the use of a global space.</p> <p>In app.js you can create db connection once:</p> <pre class="lang-js prettyprint-override"><code>var hub = require('hub'); hub.db = new Db('foobar', new Server('10.0.2.15', 27017, {}), {native_parser: false}); </code></pre> <p>And use it from any other files:</p> <pre class="lang-js prettyprint-override"><code>var hub = require('hub'); // hub.db - here link to db connection </code></pre> <p>This method uses a feature of 'require'. Module is only loaded for the first time and all the other calls gets a reference to an already loaded instance.</p> <p><strong>UPDATE</strong></p> <p>That's what I mean:</p> <p>In main file like app.js we create Db connection, open it and store into hub:</p> <p>app.js:</p> <pre class="lang-js prettyprint-override"><code>var hub = require('hub'); hub.mongodb = require('mongodb'); hub.mongodbClient = new hub.mongodb.Db('foobar', new hub.mongodb.Server('10.0.2.15', 27017, {}), {native_parser: false}); hub.mongodbClient.open(function(error) { console.log('opened'); }); </code></pre> <p>Now in any other file (message for example) we have access to opened connection and can simple use it:</p> <p>message.js:</p> <pre class="lang-js prettyprint-override"><code>var hub = require('hub'); var collection = new hub.mongodb.Collection(hub.mongodbClient, 'message'); module.exports.count = function(cb) { collection.count({}, function(err, count) { cb(err, count); }); }; </code></pre>

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