Spring Oracle 引导可分页计数查询错误

Question

我在使用 Oracle 的 Spring JPA 时遇到了问题。

首先，我需要制作一个元素列表（可分页），但我只有一个视图来做所有事情。

这就是我需要在 SQL 语句中使用“distinct”子句的原因。客户不给我其他方式获取数据。

class:

@Entity
@IdClass(TRN04MunicipalityIdEntity.class)
@Table(name = "VISTA_EVENTOS_OGP")
@NamedQuery(name = "TRN04MunicipalityEntity.findId",
            query = "select distinct e from TRN04MunicipalityEntity e where e.idMunicipio = ?1 and e.idProvincia = ?2"
            + " order by COD_PROV_NORA")
@NamedQuery(name = "TRN04MunicipalityEntity.findAllOf",
            query = "select distinct e from TRN04MunicipalityEntity e where COD_MUN_NORA is not null order by COD_PROV_NORA")

public class TRN04MunicipalityEntity {

    @Id
    @Column(name = "COD_MUN_NORA", precision = 3, scale = 0)
    private BigDecimal idMunicipio;
    
    @Id
    @Column(name = "COD_PROV_NORA", precision = 3, scale = 0)
    private BigDecimal idProvincia;

    @Column(name = "MUNICIPIO_ES", length = 50, insertable = false, updatable = false)
    @Basic()
    private String municipioEs;

    @Column(name = "MUNICIPIO_EU", length = 50, insertable = false, updatable = false)
    @Basic()
    private String municipioEu;
}

当我在“findAllOf”上使用分页时有一些奇怪的东西。

分页查询可以（第1页的情况）

select
        * 
    from
        ( select
            distinct trn04munic0_.COD_MUN_NORA as cod_mun_nora4_0_,
            trn04munic0_.COD_PROV_NORA as cod_prov_nora5_0_,
            trn04munic0_.MUNICIPIO_ES as municipio_es6_0_,
            trn04munic0_.MUNICIPIO_EU as municipio_eu7_0_ 
        from
            VISTA_EVENTOS_OGP trn04munic0_ 
        where
            COD_MUN_NORA is not null 
        order by
            COD_PROV_NORA ) 
    where
        rownum <= ?

但是……计数查询没有意义

select
        count(distinct trn04munic0_.COD_MUN_NORA,
        trn04munic0_.COD_PROV_NORA) as col_0_0_ 
    from
        VISTA_EVENTOS_OGP trn04munic0_ 
    where
        COD_MUN_NORA is not null

count函数上有两个元素，简直是无稽之谈

有什么想法吗？

坦克很多

Answer 1

只需使用 @Query( ... countQuery="...").

显式指定适当的计数查询

Spring Oracle 引导可分页计数查询错误

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