我可以按日期查询 MongoDB ObjectId 吗

发布于01月06日

我知道objectid包含它们创建的日期.有没有办法查询ObjectId的这一方面？

推荐答案

Popping Timestamps into ObjectIds详细介绍了基于ObjectId中嵌入的日期的查询.

简而言之，在JavaScript代码中:

/* 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') } });