pymongo

问题 what is the difference between mongo-hadoop and mongo-spark connector and does pymongo work only with mango-hadoop? Is pymongo used only with mongo-hadoop? 回答1: The MongoDB Connector for Hadoo p is a library which allows MongoDB (or backup files in its data format, BSON) to be used as an input source, or output destination, for Hadoop MapReduce tasks. It is designed to allow greater flexibility and performance and make it easy to integrate data in MongoDB with other parts of the Hadoop

问题 Now,I try to insert data with pymongo in mongoldb. get_db().users.update({'_id':ObjectId(session['user_id'])},{'$push':{'hme':ObjectId(id)}},upsert=True) but,the method produce duplicate ObjectID.before try find_one(). if not ObjectId(id) in get_db().users.find_one({'_id':ObjectId(session['user_id'])})['hme']: get_db().users.update({'_id':ObjectId(session['user_id'])},{'$push':{'hme':ObjectId(id)}},upsert=True) better method request.. may be use forEach.but syntax error yang 回答1: If the hme

问题 I made an python code that fetch tweets from Mongo collection called Tweets. I wan't to fetch only the object text and add an additional object called Sentiment. When i loop through the Tweets and parse the json object to a string i get the error : from pymongo.objectid import ObjectId ImportError: No module named objectid Therefor i use the following code import pymongo import nltk import json from json import JSONEncoder from pymongo import MongoClient from pymongo.objectid import ObjectId

问题 My collection contains {name:'p1', age: 20} {name: 'p2', age: 21} {name: 'p3', age: 23} {name: 'p4', ag:41 } I want to group persons such that for any person in the group there exist another person int the group such that difference between their ages is at most 2. Here resulting group will contain expected result [{name:'p1' ...}, {name:'p2' ...}, {name: 'p3'}] since ages of p2 -p1 = 1 and p3-p2 = 2 p1,p2,p3 form a group 回答1: Disclaimer Before reading the rest of the answer, please read

问题 I am trying to copy a MongoDB collection from one database to another database on the same server. from pymongo import MongoClient client = MongoClient() client.db1.coll1.insert({'content':'hello world'}) I would like to copy db1.coll to db2.coll2 on the same server. I tried to follow the "copy and move" approach described in How to copy a collection from one database to another in MongoDB but this doesn't work in pymongo. In particular, the copy step client.db1.coll1.aggregate([{'$out':

问题 SETUP: I have one PRIMARY and two SECONDARY instances of mongodb. One of the two secondary instances is hosted in the same region as my web app. I am using pymongo for connecting. QUERY: How can I get connection to a SECONDARY with lower latency. Currently I am doing this: from pymongo import ReplicaSetConnection from pymongo import ReadPreference db = ReplicaSetConnection('localhost:27017', replicaSet='rs1')['my_db'] db.read_preference = ReadPreference.SECONDARY I get a connection to any one

问题 I want to search MongoDB so that I get only results where all x are found in some configuration together in the key. collected_x = '' for x in input: collected_x = collected_x + 're.compile("' + x + '"), ' collected_x_cut = collected_x[:-2] cursor = db.collection.find({"key": {"$all": [collected_x_cut]}}) This does not bring the anticipated result. If I input the multiple x by themselves, it works. cursor = db.collection.find({"key": {"$all": [re.compile("Firstsomething"), re.compile(

问题 Im trying to build a simple application in python, where I have tags that I associated to tags. Given the following data: Book: +-------------+--------------------------------+ | id | tags | +-------------+--------------------------------+ | 1 | [python, ruby, rails] | +-------------+--------------------------------+ | 2 | [fiction, fantasy] | +-------------+--------------------------------+ | 3 | [fiction, adventure] | +-------------+--------------------------------+ How would I (using

问题 This question already has answers here : Check that Field Exists with MongoDB (4 answers) Closed 8 months ago . I am trying to figure out how to match a key and return all the values for that key. Is it possible to give the value as a wildcard? I want to return everything for that specific key using wildcard on the value. db.collection.find({"key" :"*"}) Also I was hoping this would return the entire collection as well that had the key with the wildcard value match as well. 回答1: You may be

问题 I am using Python-Eve with a MongoDB instance with authorization enabled, so I need to provide user/pass credentials in settings.py to properly initialize Python-Eve API. If used the MONGO_URI global configuration setting, to declare the database endpoint as described here it works just right: MONGO_URI = 'mongodb://<someuser>:<somepass>@<host>/<auth_db>' But if I try to use the other possible way according to Eve documentation, which is to declare at settings.py, individual settings for each