烧瓶上的 PyMongo

Question

I'm curious if this is right working.

In case of using MySQL , both connecting and closing are done per one request.

1st request: connect, close
2nd request: connect, close
3rd request: connect, close
4th request: connect, close
5th request: connect, close

every requests bring both connect and close
This is how I manage MySQL connection and think many of other developer do like this.

BUT..

In case of using mongodb with PyMongo module , it works not like above.

1st request: connect
2nd request: connect
3rd request: (use connection of 1st or 2nd) <= Do not connect but use previous connection
4th request: (use connection of 1st or 2nd) <= same
5th request: (use connection of 1st or 2nd) <= same

Does this keep the connection in app.config and use on after request?
I feel How it works is very difficult from managing connection of MySQL.
Is this normal working?
Doesn't it need to close the connection after using?

from flask import Flask
from flask_pymongo import PyMongo
app = Flask(__name__)

app.config['MONGO_HOST'] = '127.0.0.1'
app.config['MONGO_PORT'] = 27017
app.config['MONGO_DBNAME'] = 'test'
mongo = PyMongo(app, config_prefix='MONGO')

@app.route('/')
def test():
    mongo.db.user.insert({'name':'test'})
    return 'test'

if __name__ == '__main__':
    app.run()

Thank you for read.

Answer 1

You don't need to close PyMongo connections. Leave them open so that PyMongo's connection pooling gives you the most efficient performance:

https://pymongo.readthedocs.io/en/stable/faq.html#how-does-connection-pooling-work-in-pymongo

Your code, above, is correct. Create one "PyMongo" instance and reuse it throughout your application.