mongoDB

Some Important Commands

show dbs

Show all databases

db

To display the database you are using

use <db_name>

To create and use database

db.dropDatabase()

First you go to your delete database and then use this command

db.createCollection(‘collection_name’)

For creating collection

Show collections

For show all collections

db.collection_name.drop()

For delete collection

db.collection_name.insertOne({ _id : 1, name : "Rohit", age : 21})

For inserting data in collection

db.collection_name.insertMany({ _id : 2, name : "Rohit", age : 21 },{ _id : 4, name : "Rahul", age : 27 })

For inserting many data in collection

db.collection_name.find()

For reading all data in collections

db.collection_name.find().limit(3)

For accessing only 3 data in collections (Increase more number in limit more data access)

db.collection_name.find({ name : "Rohit" })

For accessing only rohit name collection in all data