DatabaseManagementSystems/Practical/Practical Exam/Connectivity/C1 - Mongo Connectivity.md

C1 - MongoDB Connectivity

Problem Statement: Write a program to implement MongoDB database connectivity with PHP /python /Java Implement Database navigation CRUD operations (add, delete, edit etc.)

---

Pre-requisites (with installation command for Ubuntu):

1. Python3 - sudo apt install python3
2. pip - sudo apt install python3-pip
3. pymongo - pip3 install pymongo OR pip3 install pymongo --break-system-packages (installs it system-wide)

Instructions

1. First, open the Terminal and log in to MongoDB:

mongo

2. Now, in Mongo we need to initialize the database and tables:

// Create database
use connectMe;
// Create collection
db.createCollection("students");
// exit
exit

We need to exit from Mongo shell since the work there is done for now.

3. Create a new file connectMongo.py with the following contents:

from pymongo import MongoClient

client = MongoClient("mongodb://127.0.0.1:27017")
database = client.connectMe
collection = database.students

collection.insert_one({"roll":"21", "name":"Stewie"}) # insert operation
print("Inserted")
collection.insert_one({"roll":"22", "name":"Foxy"}) # insert operation
print("Inserted")
collection.update_one({"roll": "21"}, {"$set": {"roll": "20"}}) # update operation
print("Updated")
collection.delete_one({"roll": "22"})
print("Deleted")

client.close()

4. Open Terminal and run the above program:

python3 connectMongo.py

Note

This step assume you have stored the file in home directory or you know how to change the current working directory.

5. That's it! You can view the changes in Mongo by logging in using mongo and viewing the table:

USE connectMe;
db.students.find();

Tip

This guide assumes your mongo shell does not have any password for root user.

Warning

Never use root as password in production. Use a strong password. This guide uses root as password for simplicity and educational purposes.

---