JPA2 CriteriaQuery中空的结果

Question

该代码使用JPA2条件查询返回一个空的结果列表：

CriteriaBuilder criteriaBuilder = getEntityManager().getCriteriaBuilder(); 
CriteriaQuery<VwReplPrevia> query = criteriaBuilder.createQuery(VwReplPrevia.class); 
Root<VwReplPrevia> root = query.from(VwReplPrevia.class); 
query.multiselect(root.get(VwReplPrevia_.codigoCentroCustos), 
      root.get(VwReplPrevia_.numeroCartaoPostagem), 
      root.get(VwReplPrevia_.codigoServico), 
      root.get(VwReplPrevia_.quantidadeItems), 
      root.get(VwReplPrevia_.valorServico)); 
TypedQuery<VwReplPrevia> typedQuery = getEntityManager().createQuery(query); 
String contrato  = StringUtils.trim(paginador.getEntityBean().getContrato()); 
String centroCustos = StringUtils.trim(paginador.getEntityBean().getCentroCustos()); 
String cartaoPostagem = StringUtils.trim(paginador.getEntityBean().getCartaoPostagem()); 
String servico  = StringUtils.trim(paginador.getEntityBean().getServico()); 
query.where(criteriaBuilder.equal(root.get(VwReplPrevia_.numeroContrato), contrato)); 
    if (StringUtils.isNotBlank(centroCustos)) { 
     criteriaBuilder.and(criteriaBuilder.equal(root.get(VwReplPrevia_.codigoCentroCustos), "9912231583")); 
    } 
    if (StringUtils.isNotBlank(cartaoPostagem)) { 
     criteriaBuilder.and(criteriaBuilder.equal(root.get(VwReplPrevia_.numeroCartaoPostagem), cartaoPostagem)); 
    } 
    if (StringUtils.isNotBlank(servico)) { 
     criteriaBuilder.and(criteriaBuilder.equal(root.get(VwReplPrevia_.codigoServico), servico)); 
    } 

    query.orderBy(criteriaBuilder.asc(root.get(VwReplPrevia_.codigoCentroCustos))); 
    query.groupBy(root.get(VwReplPrevia_.codigoCentroCustos), 
      root.get(VwReplPrevia_.numeroCartaoPostagem), 
      root.get(VwReplPrevia_.codigoServico), 
      root.get(VwReplPrevia_.quantidadeItems), 
      root.get(VwReplPrevia_.valorServico)); 
List<VwReplPrevia> resultado = typedQuery.getResultList(); 

同样的查询，使用本机查询，返回结果的正确的号码。

String sql = "SELECT vwreplprev0_.sdan8 AS col_0_0_, " + 
    "vwreplprev0_.sdcnid AS col_1_0_, " + 
    "vwreplprev0_.sdlitm AS col_2_0_, " + 
    "vwreplprev0_.sduorg AS col_3_0_, " + 
    "vwreplprev0_.sdaexp AS col_4_0_ " + 
"FROM sfe_view.vw_f4211_repl_previa vwreplprev0_ " + 
"WHERE vwreplprev0_.sddmct = '9912231583' " + 
"GROUP BY vwreplprev0_.sdan8, " + 
     "vwreplprev0_.sdcnid, " + 
     "vwreplprev0_.sdlitm, " + 
     "vwreplprev0_.sduorg, " + 
     "vwreplprev0_.sdaexp " + 
"ORDER BY vwreplprev0_.sdan8 ASC "; 
    Collection<PreviaFaturaBean> result = getEntityManager().createNativeQuery(sql).getResultList(); 
    paginador.setColecaoDeRegistros(result); 

我不知道是什么问题。我通过标准查询实施的唯一参考是http://docs.oracle.com/javaee/6/tutorial/doc/gjivm.html，有人可以给我一个提示吗？

Answer 1

以下部分看起来错了，而不是与本地查询匹配：

query.where(criteriaBuilder.equal(root.get(VwReplPrevia_.numeroContrato), contrato)); 
if (StringUtils.isNotBlank(centroCustos)) { 
    criteriaBuilder.and(criteriaBuilder.equal(root.get(VwReplPrevia_.codigoCentroCustos), "9912231583")); 
} 

这也许应该是

query.where(criteriaBuilder.equal(root.get(VwReplPrevia_.numeroContrato), "9912231583")); 
if (StringUtils.isNotBlank(centroCustos)) { 
    criteriaBuilder.and(criteriaBuilder.equal(root.get(VwReplPrevia_.codigoCentroCustos), centroCustos)); 
} 

如果这不是问题，看看哪些SQL查询中产生记录您的JPA引擎，并将其与本机查询进行比较以找出差异。