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From Antonio Gallardo <>
Subject Re: OT: O/R collection mapping [was: SQLTransformer]
Date Wed, 07 Sep 2005 02:17:51 GMT
Leszek Gawron wrote:

> Vadim Gritsenko wrote:
>> Leszek Gawron wrote:
>>> - Marathon class:
>>>   - name
>>>   - place
>>>   - date
>>>   - thoseWhoFinishedTheRace collection which is a sorted list of 
>>> those Persons who managed to get to the finish line. The list is 
>>> sorted in an order of finishing so thoseWhoFinishedTheRace().get( 0 
>>> ) is the winner.
>>> In this example the collection is not _sorted_ - it is _ordered_ 
>>> with information not available to Person bean. The use of index 
>>> field is mandatory - it's not bad database design.
>> It is bad - good design will have 'finished' timestamp ;-P
> LOL. Still there are several usecases when you do not have a field to 
> sort on like "a list of shirts I like best starting from the most 
> favourite one". :)
Not sure is there can be a usecase where you will not need to store a 
value in the DB. But, let assume the special usecase exists, then the 
additional index should be "optional" and not obligatory as is now in 
hibernate. ;-)

I also noted [0]: "The index of an array or list is always of type integer."

Again, this is a non-sense: Obligatory index + obligatory index type!

Of course, this does not cover cases where the user prefer to use 
another index type, for example a string or a char or whatever other 
type the user want to use. This is another reason to choose Apache OJB 
[1]. The worse is that instead of offer a solution in hibernate 3, they 
offer just "a cool justification" why this non-sense [0]. I really 
wonder how is people using hibernate after all. The only answer I found 
is "they must have an excelent marketing engine a la 
${readerPreferedCorporate.getName()}". ;-)

IMO, a good O/R mapping tool should not force us to "hack" our database 
or our code. ;-)

Best Regards,

Antonio Gallardo.


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