Mongo db datatypes
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MongoDB supports various data types including null, string, boolean, date, array, embedded documents, ObjectId, and BSON. The ObjectId data type is a unique identifier that is automatically generated. It consists of a 12-byte hexadecimal number, with the first 4 bytes representing the timestamp, next 3 bytes representing the machine identifier, following 2 bytes representing the process id, and last 3 bytes being an incrementing counter.
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Mongo db datatypes
- 2. DataType • Null Datatype : ,“mName”:null- • String : ,“fName”:”anish”- • Boolean : ,“married”:false} • Date : ,“accountOpeningDate”: new Date()- • Array : ,“posts” : *“good”,”bad”,”average”+- • embeddedDocument : ,“publisher" : ,“name" : “address"-- • BSON (Covered Later) • ObjectId • More detailed http://api.mongodb.org/perl/current/MongoDB/DataTyp es.html zariga.com
- 3. Most important the AutoGenerated Object ID DataType • Size 12 bytes • First 4 refer to timeStamp (513c60fa) • Next 3 byte : hash of the hostname (b2080f) • Next 2 bytes taken from the PID (8932) • Last three byte is increment counter (86d0a4) Example > db.user.find() • { "_id" : ObjectId("513c60fab2080f893286d0a4"), "lName" : "anish", "date" : ISODate("2013-03- 10T10:31:18.632Z") } zariga.com