Mongodb basic command
This blog and in upcoming blog we will see
mongodb basic and how is it work with installation and after
installation we should not face any problem while making Database, collection(table) and using the data in nodejs even whenever we will make
API.
-
# Install MongoDB Package
-
# Connect MongoDB with Nodejs
- # Show data from mongoDB
Now in this blog we will consider about mongoDB basic command which we can use
to create Database, collection etc.
What is MongoDB
MongoDB is a popular open-source NoSQL (non-relational) database management system. NoSQL means no structure like it is look like an object while in SQL it is a structure query language like SELECT CustomerName, City FROM Customers; (The SELECT statement is used to select data from a database.) But NoSQL database is useless...NOT completely because of whenever we want add extra column in database then it is possible through NoSQL MongoDB.
MongoDB installation - CLICK HERE
MongoDB Basic Command -
CLICK HERE
About MongoDB vs SQL - CLICK HERE
CRUD in MongoDB - CLICK HERE
Object Like -
{
"_id": {
"$oid": "659ad46e0382148123c82841"
},
"name": "moto G60",
"brand": "motorola",
"price": 16500,
"category": "mobile"
}
MongoDB is a type of database that helps store and manage large amounts
of data in a flexible and scalable way. Unlike SQL, MongoDB doesn't require a
fixed structure for the data, allowing you to store information in a more
versatile format.
- MongoDB is a NoSQL database.
- The data stored in a collection
- Collection don't have row and columns
- Data is stored in the form of object.
Now you can understand how can we connect nodejs with the mongodb and how can
we use nodejs with the help of mongodb and data insert, update, delete,
update dynamic data or make API .
and we have some data in mongodb so after connecting mongodb with the nodejs we can show data from mongodb in nodejs.
we can install this driver as a pkg but it is driver YEAH! because of we can
connect nodejs and mongodb with the help of this driver pkg OKAY.
The official MongoDB driver for Node.js. - https://www.npmjs.com/package/mongodb ( npm i mongodb )
Connect MongoDB with Nodejs
Now we will write code in index.js for importing mongodb client and some code.
1. Importing MongoDB and Setting Up Connection:
const { MongoClient } = require('mongodb');
const url =
'mongodb://127.0.0.1:27017';
Here, you are importing the MongoClient class from the
'mongodb' package, which is the official MongoDB driver for Node.js. You
define the connection URL for your MongoDB server. In this case, it's
mongodb://127.0.0.1:27017, which is the default address and port for a locally
running MongoDB server.
2. Defining Database and Creating a MongoClient:
const
database = 'e-comm';
const client = new MongoClient(url);
You specify the name of the database you want to
connect to (e-comm), and then you create a new instance of the MongoClient
using the provided connection URL.
3. Asynchronous Function to Retrieve Data:
async
function getData() {
let result = await client.connect();
let db = result.db(database);
let collection =
db.collection('products');
let response = await
collection.find({}).toArray();
console.log(response);
}
# This function, getData, is marked as async,
indicating that it contains asynchronous operations.
# await
client.connect();: It connects to the MongoDB server asynchronously and
returns a result. This result is an instance of the MongoClient connected to
the MongoDB server.
# let db = result.db(database);: It
retrieves the specified database (e-comm in this case) from the connected
MongoClient.
# let collection = db.collection('products');:
It gets a reference to the 'products' collection within the 'e-comm'
database.
# let response = await
collection.find({}).toArray();: It performs a query to find all documents in
the 'products' collection and converts the result to an array.
# console.log(response);: Finally, it logs the array of documents (or an empty
array if there are no documents) to the console.
4. Calling the getData Function:
getData();
The script concludes by calling the getData function.
When executed, it will connect to the MongoDB server, retrieve data from the
'products' collection, and log the result to the console.
Whole Code
const {MongoClient} = require('mongodb');
const url = 'mongodb://127.0.0.1:27017'
const database = 'e-comm'
const client = new MongoClient(url);
async function getData()
{
let result = await client.connect();
let db = result.db(database);
let collection = db.collection('products');
let response = await collection.find({}).toArray();
console.log(response);
}
getData();
Run through this command - nodemon index.js or node index.js
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