JPA查询结果总数count的使用
CriteriaBuilder critBuilder = entityManager.getCriteriaBuilder();CriteriaQuery<Long> critQuery = criteriaBuilder.createQuery(Long.class);Root<Foo> root = critQuery.from(Foo.class);critQuery.select(critBuilder.countDistinct(root));int count = entityManager.createQuery(critQuery).getSingleResult().intValue();
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CriteriaBuilder critBuilder = entityManager.getCriteriaBuilder();CriteriaQuery<Long> critQuery = criteriaBuilder.createQuery(Long.class);Root<Foo> root = critQuery.from(Foo.class);critQuery.select(root).distinct(true);List<Foo> result = entityManager.createQuery(critQuery).getResultList();
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