MongoDB

The Shell

mongosh //to start

use college //to create & use a new database called "college"

difference

Collections

Document : Mongo stores data in form of documents (BSON docs)

Collection : MongoDB stores documents in collections.

MongoDB CRUD Operations

Query and Projection Operators

Update Methods

Mongoose

A library that creates a connection between MongoDB & Node.js JavaScript Runtime Environment.

It is an ODM (Object Data Modeling) Library.

NPM mongoose

mongoose documantation

vese multiple insert generally nahi karte ha, kyuki api request

Note:-

Mongoose uses Operation Buffering

Mongoose lets you start using your models immediately, without waiting for mongoose to establish a connection to MongoDB.

Validation in updation & errors:-

schema me jo rule define kiye the wo sirf insertion ke time kam karega, updation me nahi

eske liye jugar hai- refer to documentation