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。 正如你所看到的,我一直在努力,但不断地出错。 使用BSON,我必须首先解码数据才能从mongoDB检索数据吗? 任何帮助都将不胜感激! (为混乱的代码道歉,我只是通过尝试和错误练习)
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
应该对集合调用
find_one
方法{'bin-data': Binary(practicedata)}
是查找文档的查询Witch的意思是:在集合
coll
中查找一个文档,其中bin-data
等于Binary(practicedata)
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