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From Amol Chaudhari <avchaudh...@gmail.com>
Subject Help needed for representing complex business relationship
Date Fri, 05 Oct 2007 10:21:17 GMT

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
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