Many users have asked for
session.delete("from Foo foo where foo.count=0");
to issue a single SQL DELETE. This is certainly not possible for objects
with collections or cascades (though it might not matter if we ignore
Lifecycle callback; not sure). For other classes it is conceptually
possible.
Now, this is really quite easy to implement - it would take me about 1-2
hours to do it.
But my big problem is: how do we know which _loaded_ objects were deleted?
I don't think there is any good way to do this. All we get back from DELETE
is a row count.
* Do we issue a SELECT beforehand, to fetch the ids ..... and then issue
the delete?
* Do we just disable mass delete for classes which have loaded instances?
* Is it simply not worth it?
The select-then-delete option doesn't seem particularly better than the
current situation when JDBC batch updates are enabled. The
disable-when-instances-are-loaded option looks like it would work, but only
for some very limited usecases (though it may work for the usecases we are
most interested in).
Thoughts?
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