MongoDB 中的 ISODate 没有时间

Question

我想知道是否有办法更改 MongoDB 中的 ISODate 格式（从 shell 到 pymongo）以仅显示日期而不显示时间。我的实际 collection（示例）具有以下结构。

{
        "_id" : ObjectId("5dde89f8d93f9eca2f7aa135"),
        "worker_id" : "WORK_1",
        "gender" : "M",
        "birth" : ISODate("1970-06-08T00:00:00Z"),
        "job" : {
                "att" : [
                        {
                                "employer_id" : "EMPL_2",
                                "date" : ISODate("1990-05-05T00:00:00Z"),
                                "job_type" : "Att"
                        },
                        {
                                "employer_id" : "EMPL_1",
                                "date" : ISODate("1993-11-24T00:00:00Z"),
                                "job_type" : "Att"
                        }
                ],
                "mis" : [
                        {
                                "employer_id" : "EMPL_1",
                                "date" : ISODate("1991-12-01T00:00:00Z"),
                                "job_type" : "Mis"
                        }
                ]
        }
}
{
        "_id" : ObjectId("5dde89f8d93f9eca2f7aa136"),
        "worker_id" : "WORK_2",
        "gender" : "F",
        "birth" : ISODate("1988-08-22T00:00:00Z"),
        "job" : {
                "att" : [
                        {
                                "employer_id" : "EMPL_3",
                                "date" : ISODate("1995-08-30T00:00:00Z"),
                                "job_type" : "Att"
                        },
                        {
                                "employer_id" : "EMPL_3",
                                "date" : ISODate("1994-03-28T00:00:00Z"),
                                "job_type" : "Att"
                        }
                ],
                "mis" : [
                        {
                                "employer_id" : "EMPL_3",
                                "date" : ISODate("1992-01-01T00:00:00Z"),
                                "job_type" : "Mis"
                        }
                ]
        }
}
{
        "_id" : ObjectId("5dde89f8d93f9eca2f7aa137"),
        "worker_id" : "WORK_3",
        "gender" : "F",
        "birth" : ISODate("1978-05-24T00:00:00Z"),
        "job" : {
                "att" : null,
                "mis" : [
                        {
                                "employer_id" : "EMPL_1",
                                "date" : ISODate("1995-04-25T00:00:00Z"),
                                "job_type" : "Mis"
                        }
                ]
        }
}

最初我的字符串数据格式为“%Y-%m-%d”（即“1990-05-05”）。提前致谢！

Answer 1

以 ISODate 格式保存日期是有意义的；您只需要小心添加和提取日期。

在添加数据时使用 datetime.datetime.combine() 去除时间部分，并使用 datetime.date() 将其转换回日期。

from pymongo import MongoClient
import datetime

db = MongoClient()["mydatabase"]

def utc_midnight(d: datetime.date) -> datetime.datetime:
    return datetime.datetime.combine(d, datetime.time(0, 0))

db.testcollection.insert_one(
    {
        "worker_id": "WORK_1",
        "gender": "M",
        "birth": utc_midnight(datetime.date(1970, 6, 8)),
        "job": {
            "att": [
                {
                    "employer_id": "EMPL_2",
                    "date": utc_midnight(datetime.date(1990, 5, 5)),
                    "job_type": "Att"
                },
                {
                    "employer_id": "EMPL_1",
                    "date": utc_midnight(datetime.date(1993, 11, 24)),
                    "job_type": "Att"
                }
            ],
            "mis": [
                {
                    "employer_id": "EMPL_1",
                    "date": utc_midnight(datetime.date(1991, 12, 1)),
                    "job_type": "Mis"
                }
            ]
        }
    })


record = db.testcollection.find_one()
birth_date = record['birth'].date()
print(birth_date.year)
print(birth_date.month)
print(birth_date.day)

给予

1970
6
8

MongoDB 中的 ISODate 没有时间

ISODate in MongoDB without time

mongodb

isodate