Node.js MongoDB Select Record

The findOne() method is used to select a single data from a collection in MongoDB. This method returns the first record of the collection.

Example

(Select Single Record)

Select the first record from the ?employees? collection.

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Create a js file named "select.js", having 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();
});
});

Open the command terminal and run the following command:

Node select.js

Node.js Select record 1

Select Multiple Records

The find() method is used to select all the records from collection in MongoDB.

Example

Select all the records from "employees" collection.

Create a js file named "selectall.js", having 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();
});
});

Open the command terminal and run the following command:

Node selectall.js

Node.js Select record 2

You can see that all records are retrieved.

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