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 inputfunction 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, 1980db.mycollection.find({ _id: { $gt: objectIdWithTimestamp('1980/05/25') } });
