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From Michael Gentry <>
Subject Re: Cayenne cache and external changes
Date Mon, 05 Dec 2011 14:29:11 GMT
Hi Marek,

Are you talking about saving or fetching?  On saving, optimistic
locking can help catch stale data issues.  On fetching, I always
prefer to go back to the DB and get fresh data (not use the cache).


On Wed, Nov 30, 2011 at 3:53 PM, Marek Ĺ abo <> wrote:
> Hi,
> my app that uses cayenne got few rows changed externally in mysql database.
> I observed that app didn't behave according to these changes and after
> restarting it worked as expected (with those changed rows). Could this be
> due to cayenne caching mechanism. Or is it probably bug on my side? If
> former, is it possible to set time expiration on cache, or invoke expiration
> manually?
> Thanks,
> Regards,
> Marek
> On 11/30/2011 06:47 PM, Durchholz, Joachim wrote:
>> On , I see this
>> statement:
>> "As of this writing Cayenne does not support horizontal inheritance. It
>> may in the future."
>> Well, guess what, the first instance where I absolutely need inheritance
>> does require horizontal modeling. Two legacy tables happen to have a very
>> similar column structure and server very similar purposes, and since the
>> processing is complicated and accesses many fields of each record, having a
>> common superclass wired up would really simplify a lot of code.
>> So the question is: Is there any realistic hope that this will be done
>> soon?
>> Would outside help speed up things?
>> Limited help, unfortunately. I'll have to justify any time I sink into
>> this :-(
>> The other approach might be faking a vertical/joined scenario using views.
>> However, I'd like to avoid that because I know that views tend to come
>> with their own cans of worms (updateability and lack of useful metadata).
>> Regards,
>> Jo

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