> Is it good or bad to put bad
> and/or partial data into the bean because some of the form data was
> good and some was bad?
IMHO, since validation is done by the bean, partial data in one of the
attributes is not acceptable.
Ok, I might almost have enough of an idea to give a first try at this bean/DAO
stuff.
But I have a follow up question concerning validation before I start coding.
Looking at the person/address example provide in an early post by Matt, I see
the validation being in the setter methods of the bean. That was my first
instinct. But I am confused by the above statement of "since validation is
done by the bean, partial data in one of the attributes is not acceptable." Is
this not contradictory with the validation of each parameter being done within
the individual setter methods.
Maybe a simple example can explain my thinking better.
FORM ACTION PAGE
<cftry>
....
trimaBean.setID(from.trimaID);
trimaBean.setSerialNumber(form.SerialNumber);
trimaBean.setInService(form.InService);
trimaBean.setOutService(form.OutService);
//This call throws an exception, because the Out Service date is before
the in service data as an example.
....
</cftry>
First of all, would this not leave the bean in an incomplete state, it would
have the ID, SerialNumber and InService properties set, but not the OutService
date. Is this not a bad thing?
Now I would also want to go back to the form to allow the user to correct the
data, repopulating the form with the submitted data so that only the incorrect
datum needs to be fixed. Where do I get the data to repopulate the form, from
the bean, which means I would have to store the bad date in the bean to get it
back out, or some kind of branching logic in the form display to say sometimes
populate the form from a bean, other times from some other data structure?
This is the kind of thinking that gets me lost.
--------------
Ian Skinner
Web Programmer
BloodSource
www.BloodSource.org
Sacramento, CA
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