I was looking for something like a delegate, but maybe just subclassing ERXEC and overriding objectsWithFetchSpecification would be a more straightforward way to go….
On Jun 12, 2013, at 10:51 AM, "Morris, Mark" <mark.mor...@experian.com> wrote: > Right, that's what gave me some pause. It looks like, if I want to use a > different fetch spec, I need to do the fetch myself in the delegate method > and return the results. It would be nice if there was someplace where > inspecting and changing the fetch spec was an okay thing to do. > > Thanks again! > Mark > > On Jun 11, 2013, at 7:14 PM, Chuck Hill <ch...@global-village.net> wrote: > >> I don't think that either method intends for you to change the fetch spec. >> This documentation is just more explicit. The EC one is probably safer to >> do that in. >> >> Chuck >> >> >> On 2013-06-11, at 5:03 PM, Morris, Mark wrote: >> >>> Yeah, since I need to modify the fetchSpec's qualifier I guess this one >>> won't work. Looks like EOEditingContext.Delegate's >>> editingContextShouldFetchObjects is the best bet. Thanks! >>> -- Mark >>> >>> On Jun 11, 2013, at 2:14 PM, Chuck Hill <ch...@global-village.net> wrote: >>> >>>> 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! >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>> >> >> -- >> 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! >> >> >> >> >> >> >> >> >> >> >> >> > > > _______________________________________________ > 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/mark.morris%40experian.com > > This email sent to mark.mor...@experian.com _______________________________________________ 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/archive%40mail-archive.com This email sent to arch...@mail-archive.com
