MongoDB interacts with Python! This is the right way to play the database correctly!

1.Pymongo

Pymongo is the Python interface development package for MongoDB and is the recommended way to use Python and MongoDB.

Official documents

2. Installation

• Search by Objectid.

>>> post_id ObjectId(...)>>> posts.find_one({"_id": post_id}){u‘date‘: datetime.datetime(...), u‘text‘: u‘My first blog post!‘, u‘_id‘: ObjectId(‘...‘), u‘author‘: u‘Mike‘, u‘tags‘: [u‘mongodb‘, u‘python‘, u‘pymongo‘]}

• Do not convert the type of Objectid to string

>>> post_id_as_str = str(post_id)>>> posts.find_one({"_id": post_id_as_str}) # No result >>>

• If post_id is a string

from bson.objectid import ObjectId # The web framework gets post_id from the URL and passes it as a string def get(post_id):  # Convert from string to ObjectId:  document = client.db.collection.find_one({‘_id‘: ObjectId(post_id)})

4.mongoDB Other operations

1. Super Admin

• For more secure access to MongoDB, visitors are required to provide a user name and password, so users need to be created in MongoDB

  Using the role-user-database security management method

  Common system roles are as follows:

• Enable secure authentication

  Modifying a configuration file

sudo vi /etc/mongod.conf

• Enable authentication

  Note: You must add a space between keys and values, or the parsing will error

security: authorization: enabled

• Restart Service

sudo service mongod stopsudo service mongod start

• Terminal connection

mongo -u ‘admin‘ -p ‘123‘ --authenticationDatabase ‘admin‘

• General user Management

  Log in with Super Administrator and then go to user management action

  View users of the current database

2. master-Slave Dual Standby

Advantages of replication

• Replication provides redundant backups of data, stores copies of data on multiple servers, improves data availability, and ensures data security

• Replication also allows recovery of data from hardware failures and service outages

• STEP8: New open window, connecting the second MONGO service

mongo --host 192.168.10.111 --port 27019

• STEP9: Inserting data into the primary server

use test1for(i=0;i<10;i++){db.t1.insert({_id:i})}db.t1.find()

3. Backup

• Grammar

5.Mongodb interacting with Python

• Before we learned the crawler, we now store the crawled data in MongoDB.

• Turn on MONGO, run code

With the Robo 3T visualizer we can see that 137 data has been fetched and stored in MongoDB

6. Complete the Command line project: Student Information Management (based on Python2.7)

• Code manipulation

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MongoDB interacts with Python! This is the right way to play the database correctly!