My latest project has a lot of DAO going on and while it made sense (for some reason, habit?) at first I regret going that way and will, over time, be migrating into the same pattern that Michael highlights. Its really just a big useless layer for all the reasons he highlights, at least in my context.
John- On Tue, Mar 30, 2010 at 2:20 PM, Michael Gentry <[email protected]>wrote: > Hi Mike, > > I personally tend to not create DAOs for Cayenne. If I need a findBy* > type method, I just add it to the Cayenne-generated class as a static > method. (For example, I have a User.withUsernameAndPassword() static > method in my User class.) For findById, you can use DataObjectUtils > directly if you like: > > http://cayenne.apache.org/doc/api/org/apache/cayenne/DataObjectUtils.html > (objectForPK) > > Of course, this is just what I tend to do. Your mileage and that of > others will likely vary. To me, part of the concept of the DAO is > that you can transparently and magically change the DAO code to use a > different ORM and if everything else is using the DAOs, it'll all just > work. Of course, the assumes that every single ORM works exactly the > same way (they don't) and it also means you are choosing your ORM for > failure (because you expect the need to swap them out). Cayenne works > differently than Hibernate which works differently than other ORMs. I > choose an ORM for the features it gives me. To me it doesn't make as > much sense to code with the DAOs (especially when they limit the use > of your ORM), but I'm sure others will disagree with me. :-) > > mrg > > > On Tue, Mar 30, 2010 at 4:51 PM, <[email protected]> wrote: > > When using Cayenne are DAO's still the pattern used for findAll, > > findByProperty, and findById query methods or is there some better way to > > do this in Cayenne? For example in the pet store project I see DAO's > > being implemented, but I know that example was taken from other projects > > that use DAO's to begin with so I'm not sure if it was just retrofitted > to > > use DAO's with Cayenne. I tried to look at some other examples from the > > website, but most of those are either not complex enough to warrant that > > kind of structure or the links are dead. I hope this is clear. :) Also > > if DAO's are the recommended pattern to use is there a tool (i.e. eclipse > > plugin) that will generate them? > > > > Thanks. > > -Mike > > >
