Re: Feature proposal for JDO 2.1 maintenance: current DB time

[Craig L Russell]

Hi Jörg,






Thanks!

Craig

On Oct 19, 2006, at 1:33 AM, Jörg von Frantzius wrote:

Sorry to exercise you more on this, but I'm still having a bit of difficulty seeing how to use this feature. Could you please give us an example of the use case you describe below? I'd like to see the JDOQL query that uses new Date() in action.

Hello Craig,



Regards,
Jörg

Craig L Russell schrieb:

as far as I can see that does satisfy our requirements. Once we are able to query for that date in JDOQL, we can use it e.g. for lastmodification timestamps and the like.

It's easy enough to define "new Date()" as being evaluated on the back end for queries that are executed on the back end. And being evaluated in the vm for queries that have a bound candidateCollection.

Craig

On Oct 16, 2006, at 11:58 AM, Erik Bengtson wrote:

But does this satisfy the requirements? Once you have a Date in JDOQL, what can you do with it?

+1. maybe "new Date()" could be the expression where evaluation occurs on the

database.

Quoting Jörg von Frantzius <[EMAIL PROTECTED]>:

Dear experts,


algorithm.

In distributed systems in general it is often crucial for

that is accessible from all processes.


of the database, e.g. as a JDOQL function.


Regards,
Jörg

there had been several occasions where in our applications we had to determine the database server's current time(-stamp). In one application we needed it to synchronize sent JMS messages with visibility of commits in the database, and in another we need it for our simple replication synchronization purposes to have a common source of time information It would be great if JDO2 could offer a way of doing that independently

Craig Russell

Architect, Sun Java Enterprise System http://java.sun.com/products/ jdo

408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!

Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!

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