I'd defer fetching the child objects until needed. This approach offers two advantages: - it is simple on the UI side using swing or AJAX - it is simple on the iBATIS side, because you don't have to configure anything complex
Larry On 10/5/07, Amol Chaudhari <[EMAIL PROTECTED]> wrote: > > Hello All, > We recently started using iBatis. On one of our complex screens we have > requirement like this: > the screen is divided into 5 sections. A single section at the top and 2 > sections placed side by side at center and 2 more sections placed side by > side at the bottom. > > The relationship is pretty complex here. The topmost section is kind of a > summary section and others are detail sections. So if i select some row at > the top, the LHS middle and LHS bottommost sections will show the details of > the topmost section's summary values. and the RHS middle and RHS bottommost > will show the details of the record selected at the respective LHS sections. > i. e. the topmost section shows the total of some values from the LHS middle > section and LHS bottommost section. > > I am thinking of creating a single Business Object representing the whole > screen. It will have 2 List member variables, which will be lists of the > Business objects representing the middle and bottommost sections. i will > then iterate over both these lists and calculate the total (summary) values > to be shown in the topmost section. > > Now, the issue is this Object will become huge and if i have even thousands > of rows to be shown in the summary(topmost) section then it will consume > huge amount of memory. I read something about lazy loading of the objects, > but i am not very sure about its use in my case, as i need to get the lists > to calculate the summary values. > > Can anyone suggest me a better way to do this? > > One of the possible solutions is to separate these objects instead of making > a composite object. But here i am having another issue. some of the values > for my business object come from one query. using those values i can get few > other values from another query and few more from the third query. Now i > don't know how to set multiple values of my Business object from the other > queries. I can map a single value to another query but mapping more than one > is the thing i am stuck at. > > Any help will be greatly appreciated. > > Regards, > Amol > -- > View this message in context: > http://www.nabble.com/Help-needed-for-representing-complex-business-relationship-tf4574170.html#a13056406 > Sent from the iBATIS - User - Java mailing list archive at Nabble.com. > >
