【Mongodb】使用Python对Mongodb中ObjectId的操作

将Mongodb中ObjectId转换成时间戳

import pymongo
import time
import datetime
from bson.objectid import ObjectId

def getTimestamp():
connection = pymongo.MongoClient('localhost')
with connection:
db = connection['Test']
table = db['rooms']
data = table.find().sort( [['_id', -1]] ).limit(1)
objectid = data.next()['_id']
timestamp = timestamp_from_objectid(objectid)
print(timestamp) #1490666759.0
date_time = objectid.generation_time  #ObjectId convert datetime
print(date_time) #2017-03-28 10:05:59+00:00

def timestamp_from_objectid(objectid):
''' ObjectId convert timestamp '''
result = 0
try:
result = time.mktime(objectid.generation_time.timetuple())#get timestamp
except:
pass
return result

if __name__ == '__main__':
getTimestamp()

根据Mongodb中ObjectId获取某一时间段的数据

import pymongo
import time
import datetime
from bson.objectid import ObjectId

def object_id_from_datetime(from_datetime=None):
''' According to the time manually generated an ObjectId '''
if not from_datetime:
from_datetime = datetime.datetime.now()
return ObjectId.from_datetime(generation_time=from_datetime)

def range_search(start_timestamp, end_timestamp):
connection = pymongo.MongoClient('localhost')
with connection:
db = connection['Test']
table = db['rooms']
count = table.find({'_id':{'$lt' : end_timestamp, '$gte' : start_timestamp}}).count()
print(count) #get all record

if __name__ == '__main__':
#start time
start_time = datetime.datetime(2017, 3, 28, 0, 0, 0)
start_timestamp = object_id_from_datetime(start_time)
#end time
end_time = datetime.datetime(2017, 3, 29, 0, 0, 0)
end_timestamp = object_id_from_datetime(end_time)
range_search(start_timestamp, end_timestamp)