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Date: Fri, 12 Mar 2004 17:47:22 +0100
From: Jakob Braeuchi <jbraeuchi@gmx.ch>
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To: OJB Developers List <ojb-dev@db.apache.org>
Subject: Re: auto-XXX setting (PART II)
References: <4050BE9B.7080700@apache.org> <4050CDF5.30301@gmx.ch>
 <yeENOwZ0AlOfcybKgAgIgdEtAUBugGxEsubGNi81bAQ@akmail>
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hi peter,

Peter Wieland wrote:
> Hi Armin, Jakob and the others,
> 
> thanks for your mail Armin, The auto-XXX attributes become very clear in
> your proposals.
> 
> But I'm not sure whether this is really what we need. My skepticism is
> espacially related to the auto-update behaviour you propose for m:n
> relations.
> 
> I'm not sure whether it is really a good idea to leave it to the application
> programmer to store indirection table entries. While in some cases using
> auto-update="true" would be an acceptable solution, I don't think that it is
> always the desired behaviour. I think the possibility to just update the
> references, i.e. the entries in the indirection table, would be a good
> thing.

the problem here is referential integrity. if you define constraints on the 
indirection table (what you should do), then you can not insert rows without 
having the correspondent rows in m- and n-table.

> 
> Another argument supporting this request is that from an application
> programmers point of view, there is no difference in storing the n side of a
> 1:n relation or storing one side of a m:n relation. Hence I think we should
> not require special treatment for m:n relations with auto-update="false".

in a perfect world this would be true ;) in case you live in a not so perfect 
world, you either have to use auto-update=true or insert the mn-implementors 
manually...

jakob

> What do you think?
> 
> Peter
> 
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