Node.js 애플리케이션에서 MongoDB 연결을 효율적으로 재사용하려면 어떻게 해야 합니까?

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

  MongoClient.connect(url, (err, client) => {
    if (err) {
      console.log("Error connecting to MongoDB", err);
      return;
    }

    const db = client.db('test_db');
    global.mongoDB = db; // Making the connection available globally
  });

  const _db = global.mongoDB;

  module.exports = {
    getDb: () => _db,
  };

  const mongoUtil = require('./mongoUtil');
  const db = mongoUtil.getDb();

  db.collection('users').find((err, result) => {
    // Use the result
  });