CRUD Operation in MongoDB

MongoDB is one of the most popular NoSQL databases used by developers today for building modern, scalable applications. Unlike traditional relational databases, MongoDB stores data in flexible JSON-like documents, making it easier to work with real-world scenarios.

In this blog, We’ll walk through CRUD operations (Create, Read, Update, Delete) in MongoDB using a simple example: a student database. We’ll insert student details, query them, update academic information, and even delete records.

To make it more exciting, we’ll run these queries directly on MongoDB Atlas Cluster (cloud-based MongoDB). Along the way, I’ll include screenshots of my MongoDB Atlas dashboard and outputs so you can follow along visually.

Outcome:-

How to insert multiple documents into a collection

How to read and filter records using queries

How to update documents (single & multiple)

How to delete documents based on conditions

How CRUD fits into real-world development

Setup: Creating a Cluster

Create a free MongoDB Atlas account

Create a cluster and a database called collegeDB
Inside it, create a collection called STUDENTS

Create (Insert):-

Insert at least 5 student records into the students collection.

We cannot start by inserting 5 student records into our students collection together. We can create each student as separate document.

Code:-

{
student_id: "S001",
name: "Harshitha",
age: 20,
department: "CSBS",
year: 2,
cgpa: 9
}

{
student_id: "S002",
name: "Madhummitha",
age: 21,
department: "CSBS",
year: 3,
cgpa: 8.5
}
{
student_id: "S003",
name: "Lokhitha",
age: 20,
department: "MI",
year: 3,
cgpa: 8
}

{
student_id: "S004",
name: "Hareesh",
age: 22,
department: "IT",
year: 3,
cgpa: 9.2
}
{
student_id: "S001",
name: "Harshitha",
age: 20,
department: "CSBS",
year: 2,
cgpa: 9
}

{
student_id: "S002",
name: "Madhummitha",
age: 21,
department: "CSBS",
year: 3,
cgpa: 8.5
}

READ(QUERY)

Find all students with CGPA > 8.

db.students.find({ cgpa: { $gt: 8 } })

Find students belonging to the Computer Science department.

db.students.find({ department: "CSE" })

UPDATE

Update the CGPA of a specific student.

{ "student_id": "S005" }

Delete:-

Delete one student record by student_id.

{ "student_id": "S004" }

RESULT

Conclusion:-

In this blog, we explored how to perform CRUD operations in MongoDB using a real-world example of a student database. Starting from inserting records, querying based on conditions, updating multiple documents, and finally deleting specific records – we’ve covered the foundation of working with MongoDB.

CRUD operations form the building blocks of every application, whether you’re managing users in a website, products in an e-commerce app, or students in a college system.

Thanks to Mr.@santhoshnc for encouraging us in exploring new paths in technology and gain knowledge.