我可以按日期查询MongoDB ObjectId吗?

2022-08-30 02:09:23

我知道ObjectIds包含它们的创建日期。有没有办法查询 ObjectId 的这一方面?


答案 1

在 ObjectIds 中弹出时间戳可以非常详细地涵盖基于 ObjectId 中嵌入的日期的查询。

在 JavaScript 代码中简要介绍:

/* This function returns an ObjectId embedded with a given datetime */
/* Accepts both Date object and string input */

function objectIdWithTimestamp(timestamp) {
    /* Convert string date to Date object (otherwise assume timestamp is a date) */
    if (typeof(timestamp) == 'string') {
        timestamp = new Date(timestamp);
    }

    /* Convert date object to hex seconds since Unix epoch */
    var hexSeconds = Math.floor(timestamp/1000).toString(16);

    /* Create an ObjectId with that hex timestamp */
    var constructedObjectId = ObjectId(hexSeconds + "0000000000000000");

    return constructedObjectId
}


/* Find all documents created after midnight on May 25th, 1980 */
db.mycollection.find({ _id: { $gt: objectIdWithTimestamp('1980/05/25') } });

答案 2

在 中,可以通过以下方式完成:pymongo

import datetime
from bson.objectid import ObjectId
mins = 15
gen_time = datetime.datetime.today() - datetime.timedelta(mins=mins) 
dummy_id = ObjectId.from_datetime(gen_time)
result = list(db.coll.find({"_id": {"$gte": dummy_id}}))