Re: [hibernate-dev] Hibernate Search Projection
Hi,
Projection
The ability to project some fields the index only avoiding the
database roundtrip.
fullTextQuery.setProjection("id", "summary",
"author.name").list();
will return a List<Object[]> like the regular HQL projection
the fieldbridge has to be two way (all built-in are) and the
projected fields have to be Store.YES or Store.COMPRESS
Looks good to me. It is a shame so that you have to specify the index
field names explicitly as strings.
I wonder if there could be another way? On the one hand you are able to
index a field just via annoation,
not caring what the lucene field name will be, on the other hand you have
to use the field names in the projection.
Unfortunately, I haven't used projections before so I have to understand
the code first.
My main question right now - what type of objects are returned from the
query? Partly populated objects of the
managed classes or some other sort of objects?
Nevertheless, I will try it right away. I was basically looking for a
solution which would not go all the way to the
database.
A few questions:
Currently fields Store.NO or where the fieldbridge is one way are
ignored and return null.
The idea behind that is to be able to project across multiple
entities / index. Not sure if it's a useful feature.
I guess I would expect an
error if I include a field to be projected, but
it is not stored in the index.
Expose resultSize()
ie the total number of result regardless of the pagination
fullTextQuery.setMaxResult(20)resultSize() == 3000
A better name is more than welcome.
I would also opt for getResultSize()
I am fairly happy with the feature set for beta2, I will probably
close a couple of issues and release beta2 (round end of next week,
no guaranty though).
That would be great. I will be testing the new features within
the
application we are currently developing.
Cheers,
Hardy