Basic Commands

Introduction to basic MongoDB commands

Understanding and using basic MongoDB commands is essential for interacting with the database. Below are some of the most common commands used in MongoDB.

Connecting to MongoDB

To start using MongoDB, first connect to the MongoDB server using the mongo shell.

mongo

Creating a Database

Use the following command to create a new database or switch to an existing one:

use myDatabase

Creating a Collection

To create a new collection within the database, use the following command:

db.createCollection("myCollection")

Inserting a Document

To insert a new document into a collection, use the following command:

db.myCollection.insertOne({ name: "John Doe", age: 30 })

Querying Documents

To query documents in a collection, use the following command:

db.myCollection.find({ name: "John Doe" })

Updating a Document

To update an existing document in a collection, use the following command:

db.myCollection.updateOne(
    { name: "John Doe" },
    { $set: { age: 31 } }
)

Deleting a Document

To delete a document from a collection, use the following command:

db.myCollection.deleteOne({ name: "John Doe" })