pymongo | 易学教程

How can I copy one collection from MongoDB using pymongo and paste to another empty collection?

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问题 I want to copy full collection (e.g. name 'home'). Then do some changes in the 'home' collection or remove doc inside it (not a collection). And then replace changed 'home' collection to its default state from item 1. I do next: db = client["database"] home = db['home'].find() # get collection. db['home'].remove({}) # remove doc from home for i in home: self.db['home'].insert(i) But the collection is empty. 回答1: The problem with your code example is that find() returns a database cursor to

pymongo + gevent: throw me a banana and just monkey_patch?

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问题 Quickie here that needs more domain expertise on pymongo than I have right now: Are the "right" parts of the pymongo driver written in python for me to call gevent monkey_patch() and successfully alter pymongo's blocking behavior on r/w within gevent "asynchronous" greenlets? If this will require a little more leg work on gevent and pymongo -- but it is feasible -- I would be more than willing to put in the time as long as i can get a little guidance over irc. Thanks! Note: At small scale

pymongo + gevent: throw me a banana and just monkey_patch?

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How can I get top n buckets for an aggregation and all other buckets combined into an “other” bucket?

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问题 Assume a collection with schema like as shown below: { "customer" : <unique-id-for-customer>, "purchase" : <number>, } Now, I want to get the the top 5 customers (by purchase-queantity) and the 6th bucket is "others" which combines all the purchase quantity from other customers. Basically, the output of aggregation should be like: { "_id" : "customer100", "purchasequantity" : 4000000 } { "_id" : "customer5", "purchasequantity" : 81800 } { "_id" : "customer4", "purchasequantity" : 40900 } { "

Mongodb&Python（3）

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目录 Mongodb&Python 1、连接单实例 2、连接副本集 3、PY获取Mongodb的状态信息我叫张贺，贪财好色。一名合格的LINUX运维工程师，专注于LINUX的学习和研究，曾负责某中型企业的网站运维工作，爱好佛学和跑步。个人博客：传送阵笔者微信： zhanghe15069028807 ，非诚勿扰。 Mongodb&Python 使用程序操作mongodb mongodb可以使用java、python、php等语言去操作运维使用Python居多，下面介绍使用python操作Mongodb数据库使用python操作mongodb，需要使用pip安装pymongo模块 yum install epel-release -y yum install python2-pip -y pip install pymongo 1、连接单实例连接代码，单实例的连接代码 //写一个python文件，然后运行就可连接mongodb import pymongo client = pymongo.MongoClient( '127.0.0.1', 27022 ) zhang=client.zhang #指定库名 zhanghe = zhang.zhanghe #指定表名 for item in myuser.find(): #这里还有一个表名 print(item) /

mongodb $exists always returning 0

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问题 I have a database collection (named fols) like so: {'followers': { '123':1 '123':2 '123':3 } } If I run the query (Using pymongo): cursor = fols.find() cursor.count() >>3 Works fine. Now: cursor = fols.find({'followers':{'123':1}}) cursor.count() >>1 Again works fine. BUT if I try: cursor = fols.find({'followers':{'123':{'$exists': True}}}) cursor.count() >> 0 It returns 0 even though there are 3 records. 回答1: When you're not matching a complete object you need to use dot notation to use an

Use mock MongoDB server for unit test

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问题 I have to implement nosetests for Python code using a MongoDB store. Is there any python library which permits me initializing a mock in-memory MongoDB server? I am using continuous integration. So, I want my tests to be independent of any MongoDB running server. Is there a way to mock mongoDM Server in memory to test the code independently of connecting to a Mongo server? Thanks in advance! 回答1: You could try: https://github.com/vmalloc/mongomock, which aims to be a small library for mocking

How to continue insertion after duplicate key error using PyMongo

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问题 If I need to insert a document in MongoDB if it does not exist yet db_stock.update_one(document, {'$set': document}, upsert=True) .will do the job (feel free to correct me if I am wrong) But if I have a list of documents and want to insert them all what would be a best way of doing it? There is a single-record version of this question but I need an en mass version of it, so it's different. Let me reword my question. I have millions of documents, few of which can be already stored. How do I

Python 数据库骚操作 -- MongoDB

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> ● 前言 ● MongoDB GUI 工具 ● PyMongo（同步） ● Motor（异步） ● 后记前言最近这几天准备介绍一下 Python 与三大数据库的使用，这是第一篇，首先来介绍 MongoDB 吧，这里介绍 MongoDB 的两款操作库，走起！！ MongoDB GUI 工具首先介绍一款 MongoDB 的 GUI 工具 Robo 3T，初学 MongoDB 用这个来查看数据真的很爽。可以即时看到数据的增删改查，不用操作命令行来查看。操作界面图 PyMongo（同步） PyMongo 是一个同步操作的数据存储库。可能大家都对 PyMongo 比较熟悉了，这里就简单介绍它的增删改查等操作。连接 # 普通连接 client= MongoClient('localhost',27017) client= MongoClient('mongodb://localhost:27017/') # # 密码连接 client= MongoClient('mongodb://username:password @localhost :27017/dbname') db= client.zfdb # db = client['zfdb'] test= db.test 增 # 增加一条记录 person =

How to combined two output in lambda function using mongodb?

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问题 I have two collection 1) profile ,2) posts find the below pic for your reference. user_prfoile collection user_posts collection In the lambda function, when i passed the userid, then we will get the userid revlevant data display. but i need user details in feelings array. I tried with the below code, but i get the empty output def lambda_handler(event, context): print("Received event: " + json.dumps(event, indent=1)) Userid = event['userid'] uid = ObjectId(Userid) dispost = list( db.user