How to set primary key in mongodb

[Sankaravelu S]

Hi,

I want to set primary key for sno.

db.demo.insert({ "sno" : 1 , "username" : "hendry" })

Can any one please give the solution for this.


Thanks in advance.
Sankaravelu.S

[Scott Hernandez]

By default the _id field has a unique index and can be considered the
primary key in the way you are probably thinking about it.

You can do this:
db.demo.insert({ "_id" : 1 , "username" : "hendry" })

If you leave out the _id field then one will be generated for you as
an ObjectId: http://www.mongodb.org/display/DOCS/Object+IDs

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