mongodb 如何存储时间戳？创建和更新的字段是否自动可用？
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How to store timestamps? Are created and updated fields available automatically?
提问by ma11hew28
What's the best way to store timestamps in MongoDB?
在 MongoDB 中存储时间戳的最佳方法是什么？
Which format is best:
# "created": { "d" : "2010-03-29", "t" : "20:15:34" } # "created": "12343545234" # seconds since epoc # "created": "2010-03-14T21:20:14+0000"Is there a way to have MongoDB automatically set
createdandupdatedfields?
哪种格式最好：
# "created": { "d" : "2010-03-29", "t" : "20:15:34" } # "created": "12343545234" # seconds since epoc # "created": "2010-03-14T21:20:14+0000"有没有办法让 MongoDB 自动设置
created和updated字段？
采纳答案by Jonas Elfstr?m
Which format is best
哪种格式最好
Best for what?
最适合什么？
Is there a way to have MongoDB automatically set created and updated fields?
有没有办法让 MongoDB 自动设置创建和更新的字段？
Created time is in the ObjectIdbut, as far as I know, you will have to update a updatedfield manually.
创建时间在ObjectId 中，但据我所知，您必须updated手动更新字段。
Example:
例子：
ObjectId("538141a9615760fd04ffef5f").getTimestamp()
回答by halfdan
The format you need to process it with best performance in your application should be preferred. Note that as default every document in MongoDB gets a created timestamp (http://www.mongodb.org/display/DOCS/Object+IDs#ObjectIDs-DocumentTimestamps)
See 1) + I think you need to manually set the "update" field.
应首选在应用程序中以最佳性能处理它所需的格式。请注意，默认情况下 MongoDB 中的每个文档都会获得一个创建的时间戳（http://www.mongodb.org/display/DOCS/Object+IDs#ObjectIDs-DocumentTimestamps）
请参阅 1) + 我认为您需要手动设置“更新”字段。
回答by Yogesh
If you do following on mongo shell it shows you time stamp that represents when that documents inserted using mongoId. For ex. ObjectId("51f3dee5ee49f9b91e0db133").getTimestamp(), then it returns ISODate.
如果您在 mongo shell 上执行以下操作，它会向您显示时间戳，该时间戳表示使用 mongoId 插入该文档的时间。例如。ObjectId("51f3dee5ee49f9b91e0db133").getTimestamp()，然后返回ISODate。
回答by Leopd
In 1.8 and above Mongo has a way to create 64-bit timestamp values which are guaranteed unique on a single server. But they're not updated automatically. http://www.mongodb.org/display/DOCS/Timestamp+data+type
在 1.8 及更高版本中，Mongo 有一种方法可以创建 64 位时间戳值，这些值保证在单个服务器上是唯一的。但它们不会自动更新。 http://www.mongodb.org/display/DOCS/Timestamp+data+type
