Hi Vlad,
What ever results in the least/simplest/fastest code!
The way I look at is that you have a special 'ViewSupport' layer in your app
that provides sorted copies of the data for presentation. This is seperate from
the main business logic. You can supply the data as maps/sets/lists normalised
or not. The 'rules' of MVC are a bit irrelevant here. You are more concerned
with performance & simplicity. The data here is 'snap-shot' copies of the data,
not really the main data model & isn't updated. The formats of data returned
are deterrmined by the requirements of the view.
I'm speaking here of database/business systems other types may be very
different.
Keith.
--- Vladimir Levin <[EMAIL PROTECTED]> wrote:
> Hi, I have a basic design-level question to ask of those who are
> using the struts framework. The question concerns how data from
> the database get retrieved into the 'web-tier' beans
> of the application when table joins are involved.
>
> One approach is to nest objects. e.g. say we want to display
> all the BANANA records belonging to each MONKEY in our database.
>
> we can create a Monkey object and assign a list of Banana objects
> to each Monkey.
>
> public class Monkey {
> private String name;
> private List bananas; //type of objects in list is Banana
>
> public String getName() { return name; }
> public void setName(String name) { this.name = name; }
> public List getBananas() { return bananas; }
> public void setBananas(List bananas) { this.bananas = bananas; }
> }
>
> public class Banana {
> private String id;
> public String getId() { return id; }
> public void setId(String id) { this.id = id; }
> }
>
> This approach implies using the nested taglibs package. It has
> potential downside that many objects get created.
>
> Another approach is to create a 'super' object to aggregate the
> data for the join between tables. e.g.
>
> public class MonkeyBanana {
> private String name; //Monkey name
> private String id; //Banana id;
> }
>
> This is essentially a denormalization of the Monkey and Banana
> objects. It is more redundant, but we don't need to use the
> nested taglib package and we create fewer objects.
>
> Does anyone have advice regarding which approach is better?
>
> Vlad
>
>
>
>
>
>
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=====
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