Re: How can I cast a NSMutableDictionary to a EOEnterpriseObject

On Nov 19, 2008, at 2:41 PM, Mike Schrag wrote:

>>>>
>> Exactly.  Out of curiosity, how often do you do raw row fetches of  
>> all of the attributes?  Most of the time, I am only fetching a  
>> small sub-set.  That usage pattern may have been the original  
>> intention and why no attempt was made to populate the snapshot  
>> cache.  That said, this does seem like a very useful optimization.
> I'm most interested in this optimization for being able to do highly  
> optimized joins that I can then turn around and fill multiple  
> snapshot cache entries at once.  For instance if I have a mandatory  
> to-one relationship that I want to prefetch, if EOF was smart they  
> would do that in a single query and fill in the snapshot cache for  
> both EO's at once, but it's not that smart, it's really stupid and  
> it does two queries.  If I have an optional prefetched to-one, it  
> should do an outer join for me and do that in one query, but it does  
> two queries ... There are also times when I need to do much more  
> complicated SQL queries and I end up joining other tables to do it,  
> so I end up with entity columns + other stuff that I can ignore that  
> I would like to be able to do this.  So anyway, it's entirely a  
> performance optimization for complicated scenarios, but it would be  
> nice to have the option to do it relatively easily ...


Confused...  This does not sound like the "create an EO from a raw  
row" that I thought we were discussing.  What you are describing  
sounds to me like EOF's lame inability to fetch more than one entity  
with a single select.  That is definitely a performance problem, but I  
think the solution is more involved than getting objectFromRawRow to  
use the data it is passed instead of faulting.

Chuck


-- 
Chuck Hill             Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their  
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