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
What about .setCachedProjection or .setIndexedProjection to clearly signal
it is not a "real" projection ?
It's useful when you want to display a small subset of the data,
don't want managed objects, are OK to have a bigger index and if the
performance of the non projection strategy doesn't meet your
requirements (arguably uncommon);
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.
Shouldn't this result in an error ?! if the property is not actually
"mapped"
shouldn't it fail ?
Custom query to load objects
You can define the Criteria query that will be use to load the
matching objects of a lucene query.
This is especially useful when an object graph (rather than an
object) is expected: you can refine the fetchMode.
result = s.createFullTextQuery( query ).setCriteriaQuery(
s.createCriteria( Book.class ).setFetchMode(
"authors",
FetchMode.JOIN )
).list();
will load the matching books and the associated authors.
What happens if the query and the criteria are totally unrelated ? And how
are the link
done between "query" and the Criteria ? you just add an in clause on the
"id" property "blindly" ?
Expose resultSize()
ie the total number of result regardless of the pagination
fullTextQuery.setMaxResult(20)resultSize() == 3000
A better name is more than welcome.
getResultSize() ? :)
Feedback on those features are welcome esp projection, custom query
and their APIs
looks cool.
--
--
Max Rydahl Andersen
callto://max.rydahl.andersen
Hibernate
[EMAIL PROTECTED]
http://hibernate.org
JBoss a division of Red Hat
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