Thanks for the reply! I'm definitely trying to get a handle on this as I don't want to chase down the repercussions in the future! Thank so much for your help. It almost makes sense to me now...
> > should I not worry about running 'createObject' on the same local. > o_program structure member everytime? > > The fact that createObject is INSIDE the loop is precisely why it is > working now and that is good. When you posted your first "real" code > sample (the second one) with the createObject outside the loop you > were > only creating one instance of your CFC and reusing it over and over. > That is not what you wanted. If you have 7 "programs", than you need > to > create 7 objects. > > > It's not completely obvious to me how 'local' magic is working. > > It's not magic really. When you place anything (like a CFC) in the > application scope it is shared by all running requests. This is the > same as a database table that is being used by several requests at > once. > Changes made by one request will be visible to any other request > looking in the table. Think of a CFC in the application scope the > same > way. There are 3 main scopes in a CFC-- this, variables, and local. > This and variables are shared by everyone calling methods on that CFC. > > Local is specific to a particular method call. If this still does > not > make sense, PLEASE ask questions now and get it cleared up or you > will > be asking for pain down the road when your app starts crashing under > load due to concurrency issues because you didn't understand how to > make > thread-safe singletons. Print this off, read it, and post it on your > cube wall: http://www.coldfusionjedi.com/downloads/cfcscopes.pdf > > > And is there not a memory leak issue with running createObject on > every iteration? > > I'm not sure what you're asking here but the short answer is "no". > Now, > creating objects DOES consume a nominal amount of memory-- this is > true, > but that is not a "memory leak". There was a recent memory leak > fixed > in the last cumulative hot fix for CF8 that had to do with placing > CFCs > in shared scopes. I don't see how it would affect your code, but if > you > want to, you can install the hot fix. > > > Should my previous version have worked? > > Which one? > *The very first code you posted was somewhat usable. It would have > created a separate object for each record except for the fact that > you > had some syntax errors [arrayNew()] and didn't locally var your > variables. > *The second code sample you sent only used one program object and > still > didn't use locally-scoped variables. > *Your third code sample is getting closer yet, but still not correct. > > You need to locally scope ALL VARIABLES THAT ARE SPECIFIC TO THAT > METHOD > CALL. This includes "q_programs". Otherwise two people running this > code at the exact same time will be sharing the exact same contents > of > the q_programs variable since is in the variables scope by default. > > > I don't mind doing this 'local' trick everywhere, but I am curious > about why the original wasn't working properly. > > It's hard to say since your first code sample seemed to be > altered-to-protect-the-innocent to the point that you significantly > changed the flow of the code. However, I would guess that your first > iteration of the code did not work because you were not creating a > new > program object for every record in your result set. > > One more thing, I would stay away from duplicating your CFCs. It > might > work in some scenarios, but duplicate is a deep-copy and that can > mean > bad things if your CFC has references to a framework or some other > complex variable that you do not actually wish to copy. > > ~Brad > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:329660 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
