EODatabaseContext.Delegate is another option: boolean databaseContextShouldSelectObjects(EODatabaseContext dbCtxt, EOFetchSpecification fetchSpec, EODatabaseChannel dbChannel)
Invoked from the EODatabaseChannel method selectObjectsWithFetchSpecification to tell the delegate that the database channel dbChannel will select objects on behalf of the database context dbCtxt as specified by fetchSpec. If the delegate returns true, the channel will proceed to select the object. If the delegate returns false (possibly after issuing custom SQL against the adaptor) the channel will skip the select and return immediately. The delegate should not modify fetchSpec's qualifier or fetch order. Parameters: dbCtxt - The database context. fetchSpec - The criteria to select and order a group of database records. dbChannel - The database channel. Returns: Should return true to allow the select to proceed, false to cause dbChannel to return immediately. See Also: EODatabaseChannel.selectObjectsWithFetchSpecification( EOFetchSpecification fetchSpecification, EOEditingContext context) On 2013-06-11, at 12:02 PM, Morris, Mark wrote: > And as I mentioned, my initial thought is by using > EOEditingContext.Delegate's editingContextShouldFetchObjects, but I was > curious if anyone might know of any gotchas there or if there might be a > better approach. > -- Mark > > On Jun 11, 2013, at 1:59 PM, "Morris, Mark" <mark.mor...@experian.com> wrote: > >> The why is optimization. By altering the qualifier, I can greatly improve >> performance of these queries (say 20x). >> >> The what is just that, I need to watch for a certain class of queries, and >> if I see one, alter its qualifier, then let it continue processing. >> >> Thanks again! >> >> -- Mark >> >> On Jun 11, 2013, at 1:50 PM, George Domurot <masterm...@knuckleheads.net> >> wrote: >> >>> Well then, ya got me. I'm not sure I understand the why/what you're trying >>> to accomplish. >>> >>> -G >>> >>> >>> On Jun 11, 2013, at 11:23 AM, "Morris, Mark" <mark.mor...@experian.com> >>> wrote: >>> >>>> Thanks for the response! :-) Aren't those classes usually used explicitly? >>>> I'm hoping to watch every single fetch that's generated and pick and >>>> choose the ones I want to alter. >>>> >>>> -- Mark >>>> >>>> On Jun 11, 2013, at 1:18 PM, George Domurot <masterm...@knuckleheads.net> >>>> wrote: >>>> >>>>> You may want to take a peak at ERXFetchSpecificationBatchIterator or >>>>> ERXBatchingDisplayGroup. >>>>> >>>>> -G >>>>> >>>>> >>>>> >>>>> On Jun 11, 2013, at 10:41 AM, "Morris, Mark" <mark.mor...@experian.com> >>>>> wrote: >>>>> >>>>>> Hi all, >>>>>> >>>>>> If I want to check for a certain class of query, then alter the >>>>>> qualifier before the fetch is executed, any suggestions for the best >>>>>> approach? So far what I've come up with is registering for >>>>>> EOEditingContext.Delegate's editingContextShouldFetchObjects, then >>>>>> performing the fetch from there if the fetch spec matches my conditions. >>>>>> >>>>>> Thanks for any advice! >>>>>> >>>>>> Regards, >>>>>> Mark >>>>>> _______________________________________________ >>>>>> Do not post admin requests to the list. They will be ignored. >>>>>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >>>>>> Help/Unsubscribe/Update your Subscription: >>>>>> https://lists.apple.com/mailman/options/webobjects-dev/mastermind%40knuckleheads.net >>>>>> >>>>>> This email sent to masterm...@knuckleheads.net >>>>> >>>> >>> >> > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/webobjects-dev/chill%40global-village.net > > This email sent to ch...@global-village.net -- Chuck Hill Executive Managing Partner, VP Development and Technical Services Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems. http://www.global-village.net/gvc/practical_webobjects Global Village Consulting ranks 13th in 2012 in BIV's Top 100 Fastest Growing Companies in B.C! Global Village Consulting ranks 44th in 25th annual PROFIT 500 ranking of Canada’s Fastest-Growing Companies by PROFIT Magazine!
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