[英]How add pagination on Criteria api using typedQuery?
我正在使用帶有 pageable 的 Criteria API 來返回帶有setMaxResults
的Page<MyClass>
,但是當我插入setFirstResult
和setMaxResults
,查詢總是返回 10 個元素。
如果我從 TypedQuery 中刪除setFirstResult
和setMaxResults
,我的typedQuery.getResultList()
將返回所有元素,但顯然沒有分頁。
我有一個服務,它調用我的標准發送我的主要功能peopleRepository.filter
可分頁
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;
}
我的存儲庫實現
@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);
}
例如,如果我搜索名為marcos的人,則typedQuery.getResultList()
僅返回 10 個元素,這些元素與頁數相同的元素(在我的數據庫中有 180 個)。 如果我刪除這個
typedQuery.setFirstResult(primeiroRegistro);
typedQuery.setMaxResults(totalRegistrosPorPagina);
然后typedQuery.getResultList()
返回 180 個元素但有分頁,所有 180 個元素都在沒有分頁的單頁內
嘗試使用以下配置。
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);
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