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From Andrus Adamchik <and...@objectstyle.org>
Subject Re: Must class qualifier be an entire field?
Date Tue, 27 Feb 2007 14:39:00 GMT
This works. But of course it is up to the programmer to ensure that  
the qualifier is built in such a way that multiple subclasses do not  
overlap.

Andrus


On Feb 27, 2007, at 4:24 PM, Mike Kienenberger wrote:

> I've not used single-table inheritance, but I'm pretty sure the
> qualifier is just a qualifier and completely independent of columns.
>
> It could be "0 = mod(random(), 2)" if the database supported the  
> functions.
>
> In this case, the fastest thing to do is to just test your  
> alternate qualifier.
>
> On 2/27/07, Török Péter <torokp@allround.net> wrote:
>>
>>
>> Hello,
>> is it necessary to have a full column reserved for the class  
>> qualifier in
>> case of single table inheritance?
>> I.e. instead of qualifier
>>     personType = 'CUSTOMER'
>> would something like
>>
>>     personType like 'C%'
>> work? Anyone tried such a thing yet?
>> Thanx in advance,
>> Péter
>>
>


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