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EclipseLink and MongoDB - Auto incrementing field [message #1063780]

Fri, 14 June 2013 08:21

Michael Hunziker

Messages: 4
Registered: June 2013

Junior Member

Dear all!

We're using Eclipse Link 2.4 with MongoDB.

Due to a business requirement we need to be able to generate an auto incrementing sequence (as documented here: docs.mongodb.org/manual/tutorial/create-an-auto-incrementing-field)

Has anyone ever had to do this? The problem is that the ObjectID's are not really human readable. E.g. in URLs: htt...://bookStore.com/books/51BAB665040EE9317CAD525A.
Our customer would like to be able to use an ID like 1234 to identify a book...

What do you think about this?
Is there a possibility to implement the solution proposed by MongoDB above with EclipseLink/NOSQL? Currently I don't see how I could call the mongodb-function "getNextSequence"...

Thank you for your help!

Cheers
Michael

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Re: EclipseLink and MongoDB - Auto incrementing field [message #1064285 is a reply to message #1063780]

Tue, 18 June 2013 14:39

James Sutherland

Messages: 1939
Registered: July 2009
Location: Ottawa, Canada

Senior Member

You can use a native query to create your id and either assign it to your object yourself, or use a custom Sequence in EclipseLink to use your function to define the id.

Another option would be to map a Sequence entity to a collection and keep a counter field in it that you increment and commit to get a new id (use optimistic locking).

James : Wiki : Book : Blog : Twitter

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Re: EclipseLink and MongoDB - Auto incrementing field [message #1064293 is a reply to message #1064285]

Tue, 18 June 2013 14:52

Michael Hunziker

Messages: 4
Registered: June 2013

Junior Member

Perfect, thank you James!

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