如何使用 BSON (Python) 从 MongoDB 中检索存储的数据？

Question

到目前为止，在我的代码中，我设法将数据存储到 mongoDB 中。现在我希望能够检索我存储的数据。如您所见，我一直在尝试，但不断出现错误。使用 BSON，我是否必须先解码数据才能从 mongoDB 检索数据？任何帮助将不胜感激！（代码乱七八糟，我只是摸索着练习）

import json
from json import JSONEncoder

import pymongo 
from pymongo import MongoClient

from bson.binary import Binary
import pickle

#Do this for each 
client = MongoClient("localhost", 27017)

db = client['datacampdb']
coll = db.personpractice4_collection  #creating a collection in the database 
#my collection on the database is called personpractice4_collection 

class Person:
    def __init__(self, norwegian, dame, brit, german, sweed):
        self.__norwegian = norwegian
        self.__dame = dame
        self.__brit = brit
        self.__german = german #private variable 
        self.__sweed = sweed
 
   # create getters and setters later to make OOP
 
personone = Person("norwegian", "dame", "brit", "german","sweed")  

class PersonpracticeEncoder(JSONEncoder): 
        def default(self, o):
            return o.__dict__
    

#Encode Person Object into JSON"
personpracticeJson = json.dumps(personone, indent=4, cls=PersonpracticeEncoder)
practicedata = pickle.dumps(personpracticeJson)
coll.insert_one({'bin-data': Binary(practicedata)})

#print(personpracticeJson)
#print(db.list_collection_names()) #get then names of my collections in DB 



#retriving data from mongodb 
#Retrieving a Single Document with find_one()
print(({'bin-data': Binary(practicedata)}).find_one()) #not working

Answer 1

应该在集合上调用 find_one 方法

{'bin-data': Binary(practicedata)}是查找文档的查询

coll.find_one({'bin-data': Binary(practicedata)})

表示：在集合 coll 中查找文档，其中 bin-data 等于 Binary(practicedata)

如何使用 BSON (Python) 从 MongoDB 中检索存储的数据？

How to retrieve data stored from MongoDB using BSON (Python)?

python

binary

mongodb

bson

pymongo