MongoDb with Python

You can use MongoDb with Python. So what is MongoDb?

"MongoDB is a free and open-source cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB
uses JSON-like documents with schemas. MongoDB is developed by
MongoDB Inc"

Installation

Let's take a look. The first step is installation.

First install MongoDb if it's not installed. You can find a nice install guide for ubuntu here.

Once installed verify it's running:

sudo systemctl status mongod
● mongod.service - High-performance, schema-free document-oriented database
   Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
   Active: active (running) since Wed 2019-07-17 14:27:56 CEST; 5s ago
     Docs: https://docs.mongodb.org/manual
 Main PID: 13083 (mongod)
   CGroup: /system.slice/mongod.service
           └─13083 /usr/bin/mongod --quiet --config /etc/mongod.conf

Is the server running? Great.

CRUD

Create some Python code. A new collection "myFriends" will be created.
Then records will be inserted. After that's done, it will grab every record.

#!/usr/bin/python3
import pymongo

mongo_client=pymongo.MongoClient('localhost',27017)

db=mongo_client.myDB                                                                                                                                   
my_collection=db['myFriends']

print("="*50)

tom={'name':'Tom','age':38,'sex':'Male','hobbies':['Cooking','Golf','Tennis']}
alice={'name':'Alice','age':39,'sex':'Female','hobbies':['Programming','TV','Motorcycle']}
tom_id=my_collection.insert(tom)
alice_id=my_collection.insert(alice)
print(tom_id)
print(alice_id)


print("="*25)
cursor=my_collection.find()
print(cursor.count())
for item in cursor:
    print(item)

Output:

2
{'_id': ObjectId('5d2f15d742a6c25c8dd7e5bd'), 'name': 'Tom', 'age': 38, 'sex': 'Male', 'hobbies': ['Cooking', 'Golf', 'Tennis']}
{'_id': ObjectId('5d2f15d842a6c25c8dd7e5be'), 'name': 'Alice', 'age': 39, 'sex': 'Female', 'hobbies': ['Programming', 'TV', 'Motorcycle']}

That's for inserting and reading records. Inserting is what a JSON like structure. The two other common database operations are update and delete.

To update and delete:

#!/usr/bin/python3
import pymongo

mongo_client=pymongo.MongoClient('localhost',27017)

db=mongo_client.myDB
my_collection=db['myFriends']


print("="*25)
my_collection.update({'name':'Alice'},{'$set':{'hobbies':['Music']}})
for item in my_collection.find():
    print(item)


print("="*25)
my_collection.remove({'name':'Tom'})
for item in my_collection.find():
    print(item)

Output:

=========================
{'_id': ObjectId('5d2f15d742a6c25c8dd7e5bd'), 'name': 'Tom', 'age': 38, 'sex': 'Male', 'hobbies': ['Cooking', 'Golf', 'Tennis']}
{'_id': ObjectId('5d2f15d842a6c25c8dd7e5be'), 'name': 'Alice', 'age': 39, 'sex': 'Female', 'hobbies': ['Music']}
=========================
{'_id': ObjectId('5d2f15d842a6c25c8dd7e5be'), 'name': 'Alice', 'age':    39, 'sex': 'Female', 'hobbies': ['Music']}

Related links:

• MongoDb website
• Learn Python
• Python Exercises