db.people.insert({ name: "Roshni", age: 18, hobbies: ["Coding", "Gaming", "Cooking"], hungry: false})

db.people.insert({ name: "Bhavana", age: 19, hobbies: ["Sleeping", "playing", "eating"], hungry: true})
db.people.insert({ name: "Sravya", age: 20, hobbies: ["Coding", "Sitting", "Reading"], hungry: true})
db.people.insert({ name: "Ganesh", age: 10, hobbies: ["Writing", "Gaming", "Photography"], hungry: false})

db.people.insert({ name: "Ramu", age: 25, hobbies: ["Sleeping", "playing", "eating"], hungry: true})
db.people.insert({ name: "Sita", age: 30, hobbies: ["Gardening", "Stitching", "Acting"],})


db.people.find().pretty()

MongoDB online editor

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About MongoDB

MongoDB is a cross platform document oriented NoSQL database.

Key Features:

  • Designed to overcome the the limitations of relational databases approach and other NoSQL solutions
  • Horizontal scaling
  • Load balancing capabilities
  • Better data availability and stability

Syntax help

Commands

Inserting documents

  1. db.collection.insert(): Using insert you can either insert one document or array of documents
db.employees.insert(   {empId: 3, name: 'Ava', dept: 'Sales' });
  1. db.collection.insertOne(): Inserts one document
db.employees.insertOne(  {empId: 4, name: 'Nick', dept: 'Accounting' });
  1. db.collection.insertMany: Inserts multiple documents
db.employees.insertMany([
  {empId: 1, name: 'Clark', dept: 'Sales' },
  {empId: 2, name: 'Dave', dept: 'Accounting' }
]);

Updating documents

  1. db.collection.update() : Updates one or more than one document(s) in collection based on matching document and based on multi option
db.employees.update(   
  {empId: 3 },
  { $set: { region: "Asia" } }
);
  1. db.collection.updateOne() : Updates a single document in collection based on matching document
db.employees.updateOne(   
  {empId: 2 },
  { $set: { region: "Asia" } }
);
  1. db.collection.updateMany() : Updates multiple documents in collection based on the condition.
db.employees.updateMany(   
  { dept: 'Sales'},
  { $set: { region: "US" } }
);

Deleting documents

  1. db.collection.deleteOne(<filter>, <options>): Deletes a Single document from collection
db.employees.deleteOne({ empId: 1})
  1. db.collection.deleteMany(<filter>, <options>): Deletes all documents with matching filter
db.employees.deleteMany({ dept: 'Sales'})