不兼容的类型不允许在 JOOQ dsl 中合并子查询

Posted 2023-03-28

【中文标题】不兼容的类型不允许在 JOOQ dsl 中合并子查询

【英文标题】：Incompatible type does not allow for union of subqueries in JOOQ dsl

【发布时间】：2019-12-13 10:27:54

【问题描述】：

我正在尝试使用 JOOQ 以编程方式在 java 中构建以下查询：

 select emisor,
       anio,
       mes,
       sum(case when codigo = '01' then total else 0 end) as facturas,
       sum(case when codigo = '03' then total else 0 end) as boletas,
       sum(case when codigo = '07' then total else 0 end) as notas_credito,
       sum(case when codigo = '08' then total else 0 end) as notas_debito,
       sum(case when codigo = 'RC' then total else 0 end) as resumenes,
       sum(case when codigo = 'RA' then total else 0 end) as anulaciones,
       sum(case when codigo = '40' then total else 0 end) as percepciones,
       sum(case when codigo = '20' then total else 0 end) as retenciones,
       sum(case when codigo = 'RV' then total else 0 end) as reversiones,
       sum(case when codigo = '09' then total else 0 end) as guias
from (select ruc_emisor                      as emisor,
             year(fec_registro)              as anio,
             month(fec_registro)             as mes,
             substring(nom_solicitud, 13, 2) as codigo,
             count(*)                        as total
      from bd_ose.tx_solicitud
      where year(fec_registro) = '2019'
        and month(fec_registro) = 7
      group by ruc_emisor, anio, mes, codigo
      UNION
      select num_ruc             as emisor,
             year(fec_registro)  as anio,
             month(fec_registro) as mes,
             cod_cpe             as codigo,
             count(*)            as total
      from bd_ose.tx_comprobante_inf
      where year(fec_registro) = '2019'
        and month(fec_registro) = 7
      group by num_ruc, anio, mes, codigo
     ) solicitudes
group by emisor, anio, mes
order by emisor;

我在 SQL 和 JOOQ 方面仍然相当缺乏经验，但我决定从内部开始，走出去。当我尝试将 .union() 方法应用于两个内部子查询时，我遇到了问题。我的 IDE 突出显示了一个类型不匹配错误，指出联合需要一个“org.jooq.Select<... .groupby>

我已经检查了 [union docs] (https://www.jooq.org/doc/3.11/manual/sql-building/sql-statements/select-statement/union-clause/) 上的文档，并尝试在其他地方寻找类似的案例，但不幸的是还没有成功。

这是我目前所拥有的：

package pe.net.tci.osereporterservice;

import org.jooq.*;
import org.jooq.impl.DSL;
import org.springframework.stereotype.Repository;
import pe.net.tci.osereporterservice.jooq.tables.TxComprobanteInf;
import pe.net.tci.osereporterservice.jooq.tables.TxSolicitud;

import java.util.List;

@Repository
public class ReportDAO 

  private final DSLContext dslContext;

  TxComprobanteInf txComprobanteInf = TxComprobanteInf.TX_COMPROBANTE_INF;
  TxSolicitud txSolicitud = TxSolicitud.TX_SOLICITUD;

  public ReportDAO(DSLContext dslContext) 
    this.dslContext = dslContext;
  

  public List<ReportEntry> produceReport() 

    Field<Integer> CIanio = DSL.year(txComprobanteInf.FEC_REGISTRO).as("anio");
    Field<Integer> CImes = DSL.month(txComprobanteInf.FEC_REGISTRO).as("mes");
    Field<?> CIemisor = txComprobanteInf.NUM_RUC.as("emisor");
    Field<?> CIcodigo = txComprobanteInf.COD_CPE.as("codigo");

    Field<Integer> Sanio = DSL.year(txSolicitud.FEC_REGISTRO).as("anio");
    Field<Integer> Smes = DSL.month(txSolicitud.FEC_REGISTRO).as("mes");
    Field<?> Semisor = dslContext.select(txSolicitud.RUC_EMISOR.as("emisor");
    Field<?> Scodigo = DSL.substring(txSolicitud.NOM_SOLICITUD, 13, 2).as("codigo");

 dslContext.select(
        Semisor,
        Sanio,
        Smes,
        Scodigo,
        DSL.count().as("total")
    ).from(txSolicitud)
        .where(
            (DSL.year(txComprobanteInf.FEC_REGISTRO).eq(2019))
                .and(DSL.month(txComprobanteInf.FEC_REGISTRO).eq(7))
        ).union(

  dslContext.select(
            CIemisor,
            CIanio,
            CImes,
            CIcodigo,
            DSL.count().as("total")
        ).from(txComprobanteInf)
            .where(
                (CIanio.eq(2019))
                    .and(CImes.eq(7))
            ).groupBy(CIemisor, CIanio, CImes, CIcodigo))
//...more code
  

任何帮助将此 SQL 转换为 JOOQ 或指出与此相关的有用资源将不胜感激。

【参考方案1】：

这里的问题是您将一些变量声明为Field<?> 类型，结果Java 编译器没有看到这两个Select 对象是兼容的。所以而不是：

Field<?> CIemisor = txComprobanteInf.NUM_RUC.as("emisor");
Field<?> CIcodigo = txComprobanteInf.COD_CPE.as("codigo");

您应该使用适当的泛型类型参数声明这两个变量。例如

Field<String> CIemisor = txComprobanteInf.NUM_RUC.as("emisor");
Field<String> CIcodigo = txComprobanteInf.COD_CPE.as("codigo");

其他两个变量也是如此。 （我注意到对于变量Semisor，您需要删除初始化程序中的dslContext.select( 部分。我认为这与您所做的测试有关。）

我认为此更改应该可以解决您的问题。