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From "Shannon, Bryan" <BShan...@Tribune.com>
Subject RE: Ibatis caching Empty ResultSet
Date Fri, 11 Jul 2008 05:31:40 GMT
 
Thanks, Larry.

That might be all we need to work around what we've done.  That's a
great help, thanks!
I'll dig through version control myself.

We've also noticed a very Sybase-specific (but unrelated) problem that
can be worked around, and I'll be sure to add it to the wiki. (Since I
noticed there was at least ONE other sybase user out there!)

Thanks again!
- Bryan



-----Original Message-----
From: Larry Meadors [mailto:larry.meadors@gmail.com] 
Sent: Thursday, July 10, 2008 10:43 PM
To: user-java@ibatis.apache.org
Subject: Re: Ibatis caching Empty ResultSet

Yes, that behavior did change, but I'm not positive when...it's been a
while.

Larry


On Thu, Jul 10, 2008 at 4:34 PM, Shannon, Bryan <BShannon@tribune.com>
wrote:
> Can someone please confirm whether or not iBatis used to cache the 
> empty resultset in previous versions?
>
> We have a similar situation to Serge, in his slightly older thread, in

> which our code relied on iBatis not returning the null result for the 
> second SELECT. (ie NOT caching an empty result)
>
> Upon upgrading from 2.0.9B to the latest version of iBatis, we 
> discovered that our code which used to assume that the db query would 
> be re-run the second time (after the insert, similar to Serge) and 
> find the newly inserted value...
>
> I understand that it DOES make sense to cache the empty results, but 
> did this logic change?  (I'm fully prepared to look at the code diffs 
> myself, but if someone could give me a head start, it'd be great!)
>
> If it is the case that we have to flush the cache with the INSERT of 
> each new value, then it seems in these situations we'd only have about

> item in our cache, rendering it less useful.
>
> Any help would be greatly appreciated! ;-) -Bryan
>
>
> -----Original Message-----
> From: Serge Sozonoff [mailto:serge@sozonoff.com]
> Sent: Sunday, February 10, 2008 3:25 AM
> To: user-java@ibatis.apache.org
> Subject: Re: Ibatis caching Empty ResultSet
>
> Hi Nathan and Jeff,
>
>> The real question is why are you not clearing the cache on the insert
>> statement?
> I don't see why I would clear the cache for an insert statement. As
far
> as I am concerned an inserted record shouldn't already be in the cache
> before its been inserted.
>
>> caches are generally agnostic about the content of the cache.
> Agreed, the cache can be agnostic about its content but then the real
> question is why is iBatis inserting an empty result set into the cache
> in the first place.
>>
>> This would solve your issue and ensure that your cache is always in a
>> "clean" state.  I know you claim that this "makes no sense" but it
>> does :) As long as you are issues more then one select between
inserts
>
>> which is normally the case.
> Yes I know that will fix the problem but its totally stupid to flush
the
> entire cache upon insert of a new record.
>
> Thanks,
> Serge
>

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