我可以按日期查询MongoDB ObjectId吗?
我知道ObjectIds包含创建日期。有没有办法查询ObjectId的这一方面?
回答:
将时间戳弹出到ObjectId中将详细介绍基于嵌入在ObjectId中的日期的查询。
简要介绍一下JavaScript代码:
// 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') } });
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