Node.js MongoDB Select Record Tutorial

Node.js MongoDB Select Record

When working with Node.js and MongoDB, one of the most common tasks is retrieving data from a collection. MongoDB provides simple yet powerful methods to perform this operation efficiently. In this guide, we’ll cover how to select a single record and multiple records from a MongoDB collection using Node.js.

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Select a Single Record in MongoDB

To retrieve a single record from a MongoDB collection, you can use the findOne() method. This method returns the first matching document from the specified collection.

Example: Select Single Record

Let’s select the first record from the employees collection.

Step 1: Create a JavaScript file named select.js and add the following code:

var http = require('http');
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/MongoDatabase";

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  db.collection("employees").findOne({}, function(err, result) {
    if (err) throw err;
    console.log(result.name);
    db.close();
  });
});

Step 2: Open your command terminal and run the following command:

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node select.js

This script connects to the MongoDatabase, fetches the first record from the employees collection, and prints the name of the employee to the console.

Select Multiple Records in MongoDB

To select all records from a collection, MongoDB provides the find() method. This method returns a cursor that points to all matching documents. You can convert the results into an array using the toArray() method.

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Example: Select Multiple Records

Let’s retrieve all the records from the employees collection.

Step 1: Create another JavaScript file named selectall.js and write the following code:

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

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  db.collection("employees").find({}).toArray(function(err, result) {
    if (err) throw err;
    console.log(result);
    db.close();
  });
});

Step 2: Open your command terminal and execute:

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node selectall.js

This script connects to the MongoDB database and displays all the documents stored in the employees collection.

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Understanding the Key Methods

findOne() – Fetches the first matching record from the collection.
find() – Fetches all matching records from the collection.
toArray() – Converts the cursor result of find() into an array of documents for easy handling.

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