如何使用 typedQuery 在 Criteria api 上添加分页?

How add pagination on Criteria api using typedQuery?

我正在使用可分页的条件 API 到 return 和可分页的 Page<MyClass>,但是当我插入 setFirstResultsetMaxResults 时,查询总是 returns 10个元素。

如果我从 TypedQuery 中删除 setFirstResultsetMaxResults,我的 typedQuery.getResultList() return 是所有元素,但显然没有分页。

我有一项服务调用我的标准发送我的主要功能的可分页peopleRepository.filter

public Page<People> filtrarParcial(String name, String rg, String mom, String cpf, String nickname, Integer pageNumber, Integer pageSize, List<String> sort) {
    List<Sort.Order> orders = new ArrayList<>();

    PageRequest pageRequest = PageRequest.of(pageNumber, pageSize, Sort.by(orders));

    Page<People> listPeople = peopleRepository.filter(name, rg, mom, cpf, nickname, pageRequest);

    return listPeople;
}

我的存储库实现

@Service
public class PeopleRepositoryImpl implements PeopleRepositoryQueries {
    @PersistenceContext
    private EntityManager manager;

    @Transactional(readOnly = true)
    public Page<People> filter(String name, String rg, String mom, String cpf, String nickname, Pageable pageable) {

        CriteriaBuilder criteriaBuilder = manager.getCriteriaBuilder();
        CriteriaQuery<People> query = criteriaBuilder.createQuery(People.class);

        Root<People> root = query.from(People.class);

        Path<String> nomePath = root.<String>get("name");

        List<Predicate> predicates = new ArrayList<Predicate>();

        if(!nome.equals("")) {
            Predicate nomeIgual = criteriaBuilder.like(nomePath, "%" +name.toUpperCase() + "%");
            predicates.add(nomeIgual);
        }

        query.where((Predicate[]) predicates.toArray(new Predicate[0]));

        int paginaAtual = pageable.getPageNumber();
        int totalRegistrosPorPagina = pageable.getPageSize();
        int primeiroRegistro = paginaAtual * totalRegistrosPorPagina;

        TypedQuery<People> typedQuery = manager.createQuery(query);

//      typedQuery.setFirstResult(primeiroRegistro);
//      typedQuery.setMaxResults(totalRegistrosPorPagina);

        Integer totalRows = typedQuery.getResultList().size();

        Long total = totalRows.longValue();
        return new PageImpl<>(typedQuery.getResultList(), pageable, total);
    }

如果我搜索一个名字为 marcos 的人,typedQuery.getResultList() returns 只有 10 个元素恰好与页面相同的元素数量(在我的数据库有 180 个)。如果我删除这个

typedQuery.setFirstResult(primeiroRegistro);
typedQuery.setMaxResults(totalRegistrosPorPagina);

然后typedQuery.getResultList() returns 180个元素但有分页,所有180个元素都在一个页面内没有分页

尝试以下配置。

CriteriaQuery<Long> countQuery = criteriaBuilder.createQuery(Long.class);
Root<People> entity_ = countQuery.from(query.getResultType());
entity_.alias("entitySub"); //use the same alias in order to match the restrictions part and the selection part
countQuery.select(criteriaBuilder.count(entity_));
Predicate restriction = query.getRestriction();
if (restriction != null) {
    countQuery.where(restriction); // Copy restrictions
}
Long totalCount=entityManager.createQuery(countQuery).getSingleResult();


query.setFirstResult(pageable.getOffset());
query.setMaxResults(pageable.getPageSize());
List<People> result = query.getResultList();
return PageableExecutionUtils.getPage(result,pageable, () -> totalCount);