Sequence number - Unique ID

[Sandra]

Hello,

   I need to assign certain items a unique ID, I'm thinking of a sequence number but I don't know how to implement in couch base something equivalent to SQL auto number field.

   Any advice is welcome,

   Thank you, Sandra

[Jens Alfke]

On Apr 22, 2014, at 10:33 AM, Sandra <txm...@gmail.com> wrote:

   I need to assign certain items a unique ID, I'm thinking of a sequence number but I don't know how to implement in couch base something equivalent to SQL auto number field.

Use a UUID. You can’t use a counter because of replication — there’s no way for all of the clients that replicate with the same server to coordinate on what value the counter should have.

If it’s the document ID that needs to be unique, just use the createDocument method. It assigns a UUID for the document ID.

—Jens

[Sandra]

Thank you Jens.

Would you please re-direct me to some document where I can learn about UUID?

[Traun Leyden]

Check out http://en.wikipedia.org/wiki/Universally_unique_identifier for background info.

You don't need to write any code yourself, because couchbase lite will auto-assign a UUID as long as you don't provide your own _id.

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