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

With Spring Data Jpa, we can use this method:

    /*
     * (non-Javadoc)
     * @see org.springframework.data.jpa.repository.JpaSpecificationExecutor#count(org.springframework.data.jpa.domain.Specification)
     */
    @Override
    public long count(@Nullable Specification spec) {
        return executeCountQuery(getCountQuery(spec, getDomainClass()));
    }