[Zope-DB] KeyError from Shared.DC.DA.DA

[Maciej Wisniowski]

>The "DBConnId" is very strange ("None" rather than "DB_Connection").
>
>Somehow, the "tcache" and "cache" variables are inconsistent.
>I do not know however, how this can happen.
>
>A theoretical possibility would be two different "tcache" entries
>tcache[i1] = tcache[i2] = query.
>Then "cache[query]" would be deleted for the first entry
>and the second entry would result in a "KeyError".
>
>However, such a case should be impossible...
>
>  
>
Interesting issue. I think the simplest thing that can be done is
to add some logging into _cached_result. It should allow to
track cache state and operations done on it just before the
key error.

-- 
Maciej Wisniowski