How Can I Efficiently Share Database Connections Across Node.js Modules?

Sharing Database Connections Across Node.js Applications and Modules

Maintaining a consistent database connection is crucial for seamless operation of Node.js applications. To avoid the need to re-establish connections multiple times, it's essential to implement a strategy that ensures connection sharing across different modules.

The approach described in the original query, involving the creation of a central object that manages database connections and their distribution to modules, is flawed. Instead, it's recommended to employ a module-based solution.

mongoUtil Module

This module acts as a centralized repository for database connection management. It defines functions for both establishing the connection to MongoDB and retrieving the database instance.

const MongoClient = require( 'mongodb' ).MongoClient;
const url = "mongodb://localhost:27017";

var _db;

module.exports = {

  connectToServer: function( callback ) {
    MongoClient.connect( url,  { useNewUrlParser: true }, function( err, client ) {
      _db  = client.db('test_db');
      return callback( err );
    } );
  },

  getDb: function() {
    return _db;
  }
};

Usage in app.js

In the main application file, app.js, the mongoUtil module is imported and the connectToServer function is invoked to establish the database connection.

var mongoUtil = require( 'mongoUtil' );

mongoUtil.connectToServer( function( err, client ) {
  if (err) console.log(err);
  // start the rest of your app here
} );

Accessing the Database in Other Files

In other modules or files, the mongoUtil module can be imported to retrieve the shared database instance using the getDb function.

var mongoUtil = require( 'mongoUtil' );
var db = mongoUtil.getDb();

db.collection( 'users' ).find();

By leveraging this module-based approach, you ensure that all modules within your application have access to a single, shared database connection, without the need for multiple connections and potential inconsistencies.

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