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From "Larry Meadors" <lmead...@apache.org>
Subject Re: How to handle null objects in nested ResultMaps
Date Thu, 30 Nov 2006 15:29:51 GMT
On 11/30/06, Stefan Langer <mailtolanger@googlemail.com> wrote:
> Larry Meadors wrote:
> > Not really, no.
> >
> > If you run this SQL in a database tool, it may become apparent
> > why..there is data there, it's just null. So iBATIS creates that
> > data...even if it is null.
> Well the data is there because I'm doing a left join and there are no
> pages. This I understand. What I'm interested in knowing is if IBatis
> provides a mean to make this be handeled transparently while still
> handling the N+1 Problem.

No, it does not currently do that.

> >
> > The quick solution is to look at the data returned, and remove that
> > data if you do not want it there.
> Is there someway I can do this through IBatis, like TypeHandler or
> something like that, or do I have to do this on my own in my Domainmodels?

You might look at the RowHandler interface. It would let you do this,
too, but would probably be more work.

> >
> > A better solution might be to add functionality to iBATIS to do this,
> > so you could tell it to look at a field and if it was null, to skip
> > the population of the child list.
>  From this I gather that IBatis does not provide such a functionality
> and I will have to dig in and provide it myself? Am I correct?

You are correct, yes.


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