Day 28 || Introduction to MongoDB || Setting up MongoDB || CRUD operations with MongoDB

MongoDB Topics

Day 28:

•  Introduction to MongoDB

•  Setting up MongoDB

•  CRUD operations with MongoDB

 Introduction to MongoDB:

Setting up MongoDB:

CRUD operations with MongoDB:

To read:

show databases

show collections

Create collection:

use HemaDatabase

db.createCollection('HemaCodingSchool')

db.HemaCodingSchool.insertOne({ name: 'Mahesh', role: 'Student'})

-------------------------------------------

Create: 

db.HemaCodingSchool.insertOne(

{ name: 'Mahesh', role: 'Student' }

)

-------------------------------------------

Read:

db.HemaCodingSchool.find({})

-------------------------------------------

Update:

db.HemaCodingSchool.updateOne(

{ name: 'Mahesh'}, {$set:{ role: 'Emloyee'}} 

)

-------------------------------------------

Delete:

db.HemaCodingSchool.deleteOne({name: 'Mahesh'})

==============================================

Create Many: 

db.HemaCodingSchool.insertMany([

  { name: 'Hema', role: 'Organizer' },

  { name: 'Mahesh', role: 'Employee' },

  { name: 'Maruthi', role: 'Student' }

])

------------------------------------------------------

Update Many:

db.HemaCodingSchool.updateMany(

  { name: { $in: ['Hema', 'Mahesh', 'Maruthi'] } },

  { $set: { role: 'NewRole' } }

)

---------------------------------------------

Delete Many:

db.HemaCodingSchool.deleteMany(

  { name: { $in: ['Hema', 'Mahesh', 'Maruthi'] } }

)

Interview Questions: 

1. What is a Collection in MongoDB?

2. How do you insert a document in MongoDB?

3. Explain the $set operator in MongoDB?