使用CriteriaBuilder过滤数据以比较枚举值与文字不起作用 [英] Filtering data with CriteriaBuilder to compare enum values with literals not working

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问题描述

我有一个带有枚举字段的Java类

I have a java class with a enum field,

org.example.Importacion {
...
@Enumerated(EnumType.STRING)
  private EstadoImportacion estadoImportacion;

  public static enum EstadoImportacion {
      NOT_VALID, IMPORTED, ERROR, VALID
  }

}

当我使用CriteriaBuilder创建查询并尝试比较枚举值时(从过滤器到使用文字的criteriabuilder中的一个),查询的最终结果确实不过滤枚举值,因此,如果我将org.example.Importacion.EstadoImportacion.ERROR发送给迭代器方法,则结果将不会在最终结果列表上过滤ERROR。

When I create a Query with CriteriaBuilder and I try to compare the enum values, one from a filter to the criteriabuilder using literals, the final result of the query does not filter the enum values, so if I send org.example.Importacion.EstadoImportacion.ERROR to the iterator method, the rersult will not filter ERROR on the filnal result list.

companyCod筛选正常,因此,如果我将 COMPANY001作为companyCode发送,则querybuilder会筛选最终结果。

The companyCod filters ok, so If I send "COMPANY001" as a companyCode, the querybuilder filters the final result.

我想知道如何比较查询:

I would like to know how to compare enums in the query:

   public Iterator<Importacion> iterator (
     long first, 
     long count, 
     String companyCod, 
     org.example.Importacion.EstadoImportacion estado) {

    CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();
    CriteriaQuery<Importacion> criteria = cb.createQuery(Importacion.class);
    Root<Importacion> desembolso = criteria.from(Importacion.class);
    criteria.select(desembolso);
    Predicate p = cb.conjunction();
    if(companyCod != null) {

        p = cb.and(p, cb.equal(desembolso.get("codigo"), companyCod));
        //This part works fine!
    }


    if (estado != null) {
        Expression<org.example.Importacion.EstadoImportacion> estadoImportacion = null;

        if (estado.equals(org.example.Importacion.EstadoImportacion.ERROR)) {
            estadoImportacion = cb.literal(org.example.Importacion.EstadoImportacion.ERROR);
        }

        if (estado.equals(org.example.Importacion.EstadoImportacion.IMPORTED)) {
            estadoImportacion = cb.literal(org.example.Importacion.EstadoImportacion.IMPORTED);
        }

        if (estado.equals(org.example.Importacion.EstadoImportacion.NOT_VALID)) {
            estadoImportacion = cb.literal(org.example.Importacion.EstadoImportacion.NOT_VALID);
        }

        if (estado.equals(org.example.Importacion.EstadoImportacion.VALID)) {
            estadoImportacion = cb.literal(org.example.Importacion.EstadoImportacion.VALID);
        }

        p = cb.and(p, cb.equal(estadoImportacion, cb.literal(estado)));
    //Doesn't seems to compare enum values

    }

    criteria.where(p);
    javax.persistence.Query query = em.createQuery(criteria);

    query.setMaxResults((int)count + (int)first + 1);
    query.setFirstResult((int)first);
    List resultList = query.getResultList();
    Iterator iterator = (Iterator) resultList.iterator();
    LOGGER.info("desembolso size: {}", resultList.size());
    return iterator;
}


推荐答案

您的条件将文字与枚举。那不是你想要的您想将Importacion的estadoImportacion与给定的estado进行比较:

Your criteria compares a literal with the enum. That's not what you want. You want to compare the Importacion's estadoImportacion with the given estado:

Predicate p = cb.conjunction();
if(companyCod != null) {
    p = cb.and(p, cb.equal(desembolso.get("codigo"), companyCod));
}
if (estado != null) {
    p = cb.and(p, cb.equal(desembolso.get("estadoImportacion"), estado));
}

这篇关于使用CriteriaBuilder过滤数据以比较枚举值与文字不起作用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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