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MongoDB - ObjectId


MongoDB - ObjectId

MongoDB - ObjectId In this bankruptcy, we will examine the shape of ObjectId.

An ObjectId is a 12-byte BSON type having the following shape
  • The first four bytes representing the seconds due to the fact the unix epoch
  • The next three bytes are the tool identifier
  • The next 2 bytes consists of method identity
  • The closing 3 bytes are a random counter value
MongoDB uses ObjectIds because the default price of _id field of each document, that is generated at the same time as the creation of any file.

Creating New ObjectId

To generate a trendy ObjectId use the following code
>newObjectId = ObjectId()
whilst the above statement returned the following uniquely generated identity

ObjectId(1024a02sd14ervc143")

Instead of MongoDB producing the ObjectId, you may also provide a 12-byte identification
>myObjectId = ObjectId("1024a02sd14ervc144")


Creating Timestamp of a Document

_id ObjectId thru default shops the four-byte timestamp, in most cases you do no longer want to hold the creation time of any record.
>myObjectId = ObjectId("1024a02sd14ervc144").GetTimestamp()

This will go lower back the creation time of this file in ISO date layout

ISODate("2018-10-12T21:forty nine:17Z")

Converting ObjectId to String

you may want the charge of ObjectId in a string format. To convert the ObjectId in string, use the following code
>newObjectId.Str

The above code will pass again the string layout of the Guid −
1024a02sd14ervc144




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