python mongodb

        pip install pymongo
pip install mongoengine
    

One library that provides a higher abstraction on top of PyMongo is MongoEngine. MongoEngine is an object document mapper (ODM), which is roughly equivalent to a SQL-based object relational mapper (ORM). The abstraction provided by MongoEngine is class-based, so all of the models you create are classes.

pymongo

        def test_mongo_client():

    from pymongo import MongoClient
    client = MongoClient('localhost', 27017)

    db = client['mydb']

    posts = db.posts
    post_data = {
        'title': 'Python and MongoDB',
        'content': 'PyMongo is fun, you guys',
        'author': 'Scott'
    }
    result = posts.insert_one(post_data)
    print('One post: {0}'.format(result.inserted_id))


    post_1 = {
        'title': 'Python and MongoDB',
        'content': 'PyMongo is fun, you guys',
        'author': 'Scott'
    }
    post_2 = {
        'title': 'Virtual Environments',
        'content': 'Use virtual environments, you guys',
        'author': 'Scott'
    }
    post_3 = {
        'title': 'Learning Python',
        'content': 'Learn Python, it is easy',
        'author': 'Bill'
    }
    new_result = posts.insert_many([post_1, post_2, post_3])
    print('Multiple posts: {0}'.format(new_result.inserted_ids))

    # find one 
    bills_post = posts.find_one({'author': 'Bill'})
    print(bills_post)

    # fine many
    scotts_posts = posts.find({'author': 'Scott'})
    print(scotts_posts)

    for post in scotts_posts:
        print(post)

    client.close()

    

mongoengine

        from mongoengine import *

def test_mongo_engine():
    # define collection 
    class Post(Document):
        title = StringField(required=True, max_length=200)
        content = StringField(required=True)
        author = StringField(required=True, max_length=50)
        published = DateTimeField(default=datetime.datetime.now)

    connect('mydb', 
        host='localhost', 
        port=27017, 
        alias="default" # must be `default`
    )
    # mongoengine.connection.MongoEngineConnectionError: You have not defined a default connection

    post_1 = Post(
        title='Sample Post',
        content='Some engaging content',
        author='Scott'
    )
    post_1.save()       # This will perform an insert
    print(post_1.title)
    print(post_1.id)

    post_1.title = 'A Better Post Title'
    post_1.save()       # This will perform an atomic edit on "title"
    print(post_1.title)
    print(post_1.id)

    disconnect(alias='default')

test_mongo_engine()
    

Reference

• mongodb tutorial
• getting-started-with-python-and-mongodb
• introduction-to-mongodb-and-python
• mongodb-orm-for-python
• mongoengine
• mongoengine tutorial
• robomongo

History

• 20190926: created

Copyright

• Post author: kezunlin
• Post link: https://kezunlin.me/post/e88f04e5/
• Copyright Notice: All articles in this blog are licensed under CC BY-NC-SA 3.0 unless stating additionally.

原文：https://www.cnblogs.com/kezunlin/p/12000652.html