2013/8/20 Durchholz, Joachim <[email protected]>
> > one features that was especially usefull was that it
> > auto-generates two classes per table:
> >
> > class FooRecord extends BaseFooRecord {
> > // empty
> > }
> >
> > class BaseFooRecords extends BaseRecordOrWhatever {
> > // many, many functions
> > }
>
> It's possible but hard to do right.
>
Not so hard, in my opinion.
> The main issue is that it's easier in PHP or any dynamic language than in
> Java or static languages. You need to be extra careful to make everything
> have a useful type.
>
> Also, it can conflict with business-driven subclassing.
> There are many cases where it's useful to map classes and their subclasses
> to the database; combining that with the above approach naively will give
> you multiple inheritance. (It's possible to do non-naively, of course, but
> it will require some very careful design, else it risks performance
> problems or the exclusion of valid use cases.)
>
> It's also easy to get things wrong, particularly if bytecode
> instrumentation comes into play. I suspect the actual problem wasn't in the
> two-class design but that this design brought out some horrid design flaws
> in the proxy classes that Hibernate generates - design flaws that wouldn't
> matter for a non-inheriting entity class but that turned really ugly for
> inheriting entity classes. Still, I take that as a warning that splitting a
> class into superclass and subclass needs a careful review of anything that
> does introspection or bytecode generation.
>
I think you're barking up the wrong tree, here. This feature request is
really very simple. Inheritance is used only for the purpose of being able
to "tweak" generated classes to hold new, custom methods. jOOQ would
re-generate the base class, but never the subclass with custom code.
Apart from that, nothing changes to the way jOOQ works today.
Cheers
Lukas
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