On Sun, Jul 18, 2010 at 7:49 PM, Peter Rabbitson <[email protected]<rabbit%[email protected]> > wrote:
> On Sun, Jul 18, 2010 at 02:40:47PM +0200, Leandro Hermida wrote: > > very good points and makes a lot of sense. If I can ask a more general > > question then, why do ORMs exist in the first place and why are they so > > popular vs using a object persistence mechanism? There must be some > serious > > advantage to using them. > > > > Because there yet does not exist a persistent object store, that can be > asked to fetch "all objects which have related objects whose attribute X > is Y", and which will do so by *transparrently* using native SQL methods > (namely GROUP BY over a joined resultset). Matt Trout is working on the > foundation of just such a "mapper", but this is a very very hard problem > to get right, so progress is slow. > I know this might sound sacrilegious, but established frameworks like Hibernate have solved this problem and the code is freely available, I think it would be easier to see how such complex ORM details are done there as a starting point and then go from there other than starting from completely scratch?
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