Total row count for pagination using JPA Criteria API

Posted by ThinkFloyd on Stack Overflow See other posts from Stack Overflow or by ThinkFloyd
Published on 2011-03-18T07:39:09Z Indexed on 2011/03/18 8:09 UTC
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I am implementing "Advanced Search" kind of functionality for an Entity in my system such that user can search that entity using multiple conditions(eq,ne,gt,lt,like etc) on attributes of this entity. I am using JPA's Criteria API to dynamically generate the Criteria query and then using setFirstResult() & setMaxResults() to support pagination. All was fine till this point but now I want to show total number of results on results grid but I did not see a straight forward way to get total count of Criteria query.
This is how my code looks like:

CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Brand> cQuery = builder.createQuery(Brand.class);
Root<Brand> from = cQuery.from(Brand.class);
CriteriaQuery<Brand> select = cQuery.select(from);
.
.
//Created many predicates and added to **Predicate[] pArray**
.
.
select.where(pArray);
// Added orderBy clause
TypedQuery typedQuery = em.createQuery(select);
typedQuery.setFirstResult(startIndex);
typedQuery.setMaxResults(pageSize);
List resultList = typedQuery.getResultList();

My result set could be big so I don't want to load my entities for count query, so tell me efficient way to get total count like rowCount() method on Criteria (I think its there in Hibernate's Criteria).

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