Hi FP,
That's an interesting discovery! Indeed, ResultQuery extends Iterable. The
reason for this is this quite neat API usage here:
https://blog.jooq.org/2016/09/27/a-hidden-jooq-gem-foreach-loop-over-resultquery/
I.e. the "classic" Java-5 foreach loop now works like a PL/SQL implicit
cursor
// Automatic execution here
for (Record rec : query) {
...
}
I hadn't even thought of the fact that the forEach() method is
automatically inherited as well. All the better! :)
The implementation is in AbstractResultQuery:
@Override
public final Iterator<R> iterator() {
return fetch().iterator();
}
And then, Iterable.forEach():
default void forEach(Consumer<? super T> action) {
Objects.requireNonNull(action);
for (T t : this) { // Implicit Iterable.iterator() call here
action.accept(t);
}
}
It's trivial, just convenience.
Hope this helps,
Lukas
2017-05-09 14:50 GMT+02:00 FP <[email protected]>:
> Hello everyone,
>
> I had some JOOQ code that I was writing to generate a dynamic query.
>
> I had made a selectQuery as such:
>
> SelectQuery<Record10<...>> query = ...;
>
> Afterwards, I had forgotten to perform a query.fetch(), and instead wrote:
>
> query.forEach(entry -> { ... });
>
> To my surprise, this not only compiled but also worked! I checked every
> interface that SelectQuery extends and saw that this is supported due to
> the SelectQuery <- Select <- ResultQuery <- Iterable extension, but was
> unable to find an implementation that would explain this behaviour.
>
> Could someone explain what is happening here?
>
> Best,
> FP
>
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