Pymongo Return 个文档数

Question

我想 return 根据 ValidationDate 过去 30 天和过去一年 mongodb 集合中的文档总数。这是我的示例数据

{
    "_id": {
        "$oid": "570480d5d487dd2c577a4d5f"
    },
    "ValidationDate": {
        "$date": "2016-04-05T22:00:03.335Z"
    },
    "DataRaw": " HF 13300100032016-03-30 23:40:05+0000+ 12.03+ 4.376+  1387.00 0.0",
    "ReadingsAreValid": true,
    "locationID": " HF 133",
    "Readings": {
        "BatteryVoltage": {
            "value": " 0.0"
        },
        "pH": {
            "value": 4.376
        },
        "SensoreDate": {
            "value": {
                "$date": "2016-03-30T23:40:05.000Z"
            }
        },
        "temperature": {
            "value": 12.03
        },
        "Conductivity": {
            "value": 1387
        }
    },
    "HMAC": "0f38675cac8b3b761225c80b7441df36ddc4911ff30405835d7803dcde15d0b8"
}

这是我的代码

从 pymongo 导入连接从日期时间导入日期时间

def main():
    conn = Connection()

    db = conn.cloudtest

    data = db.test_5_27
    print data.find({"ReadingsAreValid":True}).count()

if __name__ == "__main__":
    main()

代码 returns 是集合中文档的总数，但我想知道如何根据过去 30 天和过去一年根据 ValidationDate 对它们进行分组。

Answer 1

像这样：

import datetime

from pymongo import MongoClient

data = MongoClient().cloudtest.test_5_27

now = datetime.datetime.utcnow()
last_30d = now - datetime.timedelta(days=30)
last_year = now.replace(year=now.year - 1)

since_last_month = data.find({
    "ReadingsAreValid": True,
    "ValidationDate": {"$gte": last_30d}
}).count()

since_last_year = data.find({
    "ReadingsAreValid": True,
    "ValidationDate": {"$gte": last_year}
}).count()

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