Basic Commands of MongoDB
Starting MongoDB
To start MongoDB using Homebrew, run this command:
brew services start mongodb-community@8.0
Once started, enter the MongoDB shell by typing:
mongosh
Working with Databases
Create a New Database
To create or switch to a database, use:
use college
If the database doesn’t exist, it will be created automatically.
Show All Databases
show dbs
Working with Collections
Create Collections
db.createCollection("students")
db.createCollection("department")
Insert Data into Collection
Let’s insert some student records into the students collection:
db.students.insertOne({ name: "anil", age: 17, email: "anil@test.com" })
db.students.insertOne({ name: "sam", age: 19, email: "sam@test.com" })
View Data in Collection
To see all entries in the students collection:
db.students.find()
Update Data in Collection
To update the age of a student named "sam":
db.students.updateOne({ name: "sam" }, { $set: { age: 15 } })
Delete Collection
To delete the entire students collection:
db.students.drop()
Delete the Entire Database
Make sure you are using the correct database and then run:
db.dropDatabase()