In JPA 2, using a CriteriaQuery, how to count results

Question

I am rather new to JPA 2 and it\'s CriteriaBuilder / CriteriaQuery API:

CriteriaQuery javadoc

CriteriaQuery in the Java EE 6 tutorial

I would like to

Answer 1

You can also use Projections:

ProjectionList projection = Projections.projectionList();
projection.add(Projections.rowCount());
criteria.setProjection(projection);

Long totalRows = (Long) criteria.list().get(0);