MongoDB Shell 🧵​🍃​

What is MongoDB Shell?

MongoDB shell is a CLI(Command Line Tool) which is used to access databases, collections, and documents present in MongoDB.

To start it, we just have to open the terminal and type:

sudo systemctl start mongod

To open the mongo shell we have to open the terminal and type:

mongo

Now you are in the mongo shell.

Mongo Shell Commands

To see all the databases:

show dbs

To create a new database/To switch to any existing database:

use Name-Of-Database

To see all the collections of a database:

show collections

To create a new collection in a database:

db.createCollection(Name-of-new-collection)

To see all the documents of a collection:

db.Name-of-Collection.find()

To find a document matching the query:

db.Name-of-Collection.find({key:value})

To find the first occurrence of the document:

db.Name-of-Collection.findOne({key:value})

To insert a document in the collection:

db.Name-of-Collection.insert({key:value})

To insert multiple documents in a collection:

db.Name-of-Collection.insert( [ {key:value}, {key:value}, {key:value} ....  ] )

To update any document in a collection:

db.Name-of-Collection.update({key:value},{key:value});