mongoengine使用示例

#!/usr/bin/env python

# -*- coding: utf-8 -*-

'''

Created on 2017年10月19日

@author: zzy

'''

from mongoengine import *

#连接数据库

def lazy_connect():

    #mongodb://dbuser:[email protected]:27017/db_datacn

    connect('db_datacn', host='mongodb://192.168.1.58/', username='dbuser', password='sa123')

lazy_connect()

# Defining our documents

# 定义文档user,post,对应集合user,post

class User(Document):

    email = StringField(required=True)

    first_name = StringField(max_length=50)

    last_name = StringField(max_length=50)

#Embedded documents 嵌入的文件,it doesn’t have its own collection in the database

class Comment(EmbeddedDocument):

    content = StringField()

    name = StringField(max_length=120)

class Post(Document):

    title = StringField(max_length=120, required=True)

    # ReferenceField相当于foreign key

    author = ReferenceField(User, reverse_delete_rule=CASCADE)

    tags = ListField(StringField(max_length=30))

    comments = ListField(EmbeddedDocumentField(Comment))

    #允许继承

    meta = {'allow_inheritance': True}

#Post的子类

class TextPost(Post):

    content = StringField()

#Post的子类

class ImagePost(Post):

    image_path = StringField()

#Post的子类

class LinkPost(Post):

    link_url = StringField()

def save_user():

#     john = User(email='[email protected]')

#     john.first_name = 'john'

#     john.last_name = 'cvsh'

#     john.save()

#

#     ross = User(email='[email protected]')

#     ross.first_name = 'Ross'

#     ross.last_name = 'Lawley'

#     ross.save()

#

#     post1 = TextPost(title='Fun with MongoEngine', author=john)

#     post1.content = 'Took a look at MongoEngine today, looks pretty cool.'

#     post1.tags = ['mongodb', 'mongoengine']

#     post1.save()

#

#     post2 = LinkPost(title='MongoEngine Documentation', author=ross)

#     post2.link_url = 'http://docs.mongoengine.com/'

#     post2.tags = ['mongoengine']

#     post2.save()

#     for post in Post.objects:

#         print(post.title)

#

#     for post in TextPost.objects:

#         print(post.content)

#

#     for post in Post.objects:

#         print(post.title)

#         print('=' * len(post.title))

#         if isinstance(post, TextPost):

#             print(post.content)

#         if isinstance(post, LinkPost):

#             print('Link: {}'.format(post.link_url))

    Post.objects(tags='mongoengine').update(tags=['abc',''])

    for post in Post.objects.all():

    #for post in Post.objects(tags='mongoengine'):

        print(post.title)

    #Post.objects(tags='mongodb').delete()

    num_posts = Post.objects(tags='mongodb').count()

    print('Found {} posts with tag "mongodb"'.format(num_posts))

if __name__ == '__main__':

    save_user()