MongoDB is an open-source NoSQL database. It is a type of database that can manage document-oriented information. MongoDB has some strong use cases:

Following are some of the strong use cases:

• Schema-less design
• Scalability in managing Tera bytes of data
• Rapid replicaSet with high availability feature
• Sharding enables linear and scale out growth without running out of budget
• Support high write load
• Use of data locality for query processing

Following are some useful commands for MongoDB.

MongoDB Cheat Sheet

Show All Databases

show dbs

Show Current Database

db

Create Or Switch Database

use mydb

Drop

db.dropDatabase()

Create Collection

db.createCollection('users')

Show Collections

show collections

Insert Row

db.users.insert({
  name: 'Joe Smith',
  state: 'active',
  date: Date()
})

Insert Multiple Rows

db.users.insertMany([
  {
    name: 'Jenny Smith',
    state: 'active',
    date: Date()
  },
  {
    name: 'Cathy Cassidy',
    state: 'inactive',
    date: Date()
  }
])

Get All Rows

db.users.find()

Get All Rows Formatted

db.users.find().pretty()

Find Rows

db.users.find({ status: 'active' })

Sort Rows

# asc
db.users.find().sort({ name: 1 }).pretty()
# desc
db.users.find().sort({ name: -1 }).pretty()

Count Rows

db.users.find().count()
db.users.find({ status: 'active' }).count()

Limit Rows

db.users.find().limit(2).pretty()

Chaining

db.users.find().limit(2).sort({ name: 1 }).pretty()

Foreach

db.users.find().forEach(function(doc) {
  print("User name: " + doc.name)
})

Find One Row

db.users.findOne({ status: 'active' })

Find Specific Fields

db.users.find({ name: 'Joe Smith' }, {
  name: 1,
  author: 1
})

Update Row

db.users.update({ name: 'Joe Smith' },
{
  name: 'Jenny Smith',
  date: Date()
},
{
  upsert: true
})

Update Specific Field

db.users.update({ name: 'Joe Smith' },
{
  $set: {
    name: 'Joe Smith',
    status: 'active'
  }
})

Increment Field ($inc)

db.users.update({ name: 'Joe Smith' },
{
  $inc: {
    likes: 5
  }
})

Rename Field

db.users.update({ name: 'Joe Smith' },
{
  $rename: {
    likes: 'views'
  }
})

Delete Row

db.users.remove({ name: 'Joe Smith' })