Hibernate的Postgresql`无法确定参数的数据类型`

Question

我有 JpaRepository：

@Repository
public interface CardReaderRepository extends JpaRepository<CardReaderEntity, Integer > {


}

当我在这个 repo 中执行与此相同的查询时：

@Query(
    value = "SELECT new ir.server.component.panel.response." +
            "InvalidCardReaderDataDigestResponse(" +
            "    cr.driverNumber, cr.exploiterCode, cr.lineCode, " +
            "    cr.transactionDate, cr.offLoadingDate, " +
            "    cr.cardReaderNumber, " +
            "    sum(cr.count) , sum(cr.remind) " +
            ") " +
            "FROM CardReaderEntity cr " +
            "WHERE cr.company.id = :companyId " +
            "AND cr.status.id in :statusIds " +
            "AND cr.deleted = false " +
            "AND  (:fromDate is null or cr.offLoadingDate >= :fromDate ) " +
            "AND  (:toDate   is null or cr.offLoadingDate <= :toDate   ) " +
            "group by cr.driverNumber, cr.exploiterCode, cr.lineCode, cr.transactionDate, cr.offLoadingDate, cr.cardReaderNumber"
)
Page<InvalidCardReaderDataDigestResponse> findAllInvalidCardReaderDataDigestByCompanyIdAndStatusIdIn(
        @Param( "companyId" )   int companyId,
        @Param( "fromDate" )    Date fromDate,
        @Param( "toDate" )      Date toDate,
        @Param( "statusIds" )   List<Integer> statusIds,
        Pageable pageable
);

错误是：

org.postgresql.util.PSQLException: ERROR: could not determine data type of parameter $3
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2433) ~[postgresql-42.2.2.jar:42.2.2]
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2178) ~[postgresql-42.2.2.jar:42.2.2]
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:306) ~[postgresql-42.2.2.jar:42.2.2]

但是当查询更改为：

@Query(
    value = "SELECT new ir.server.component.panel.response." +
            "InvalidCardReaderDataDigestResponse(" +
            "    cr.driverNumber, cr.exploiterCode, cr.lineCode, " +
            "    cr.transactionDate, cr.offLoadingDate, " +
            "    cr.cardReaderNumber, " +
            "    sum(cr.count) , sum(cr.remind) " +
            ") " +
            "FROM CardReaderEntity cr " +
            "WHERE cr.company.id = :companyId " +
            "AND cr.status.id in :statusIds " +
            "AND cr.deleted = false " +
            "AND  (:fromDate is null ) " +
            "AND  (:toDate   is null ) " +
            "group by cr.driverNumber, cr.exploiterCode, cr.lineCode, cr.transactionDate, cr.offLoadingDate, cr.cardReaderNumber"
)
Page<InvalidCardReaderDataDigestResponse> findAllInvalidCardReaderDataDigestByCompanyIdAndStatusIdIn(
        @Param( "companyId" )   int companyId,
        @Param( "fromDate" )    Date fromDate,
        @Param( "toDate" )      Date toDate,
        @Param( "statusIds" )   List<Integer> statusIds,
        Pageable pageable
);

这项工作没有错误，但希望使用 fromDate 和 toDate

运行

注意：

CardReaderEntity中的

offLoadingDate：

@Basic
@Temporal( TemporalType.TIMESTAMP )
public Date getOffLoadingDate() {
    return offLoadingDate;
}
public void setOffLoadingDate(Date offLoadingDate) {
    this.offLoadingDate = offLoadingDate;
}

我的 java 文件中的所有日期导入都是 java.util.Date。

Answer 1

PostgreSQL 驱动程序试图找出参数的类型，以将这些参数直接告知 PostgreSQL 服务器。这是 PostgreSQL 服务器能够比较字段所必需的。在 java.sql.Timestamp 的情况下，PostgreSQL 驱动程序无法执行此操作，因为 PostgreSQL 有两个匹配字段。一方面是时间戳，另一方面是带有时区信息的 timestamptz。结果是，PostgreSQL 驱动程序只会将其与 Oid.UNSPECIFIED 匹配。这种行为大多数时候不是问题，因为 PostgreSQL 服务器能够检测到该类型。在 PostgreSQL 驱动类 PgPreparedStatement 中有对此问题的详细描述。

因此，您可以做的是仅在 Postgres 无法检测到正确类型（当您检查 null 时）时强制转换为时间戳/日期类型。 所以不是

(:fromDate is null )

使用

(cast(:fromDate as date) is null )

toDate 相同

Answer 2

根据我的经验，您必须先为外部值分配一个类型，然后才能让 postres 检查它是否为空。例如，此代码不适用于 postgres：

SELECT * FROM table WHERE $1 IS NULL OR column = $1;

什么会起作用：

SELECT * FROM table WHERE $1::text IS NULL OR column = $1::text;

您可以尝试将正确的类型应用于您的变量，看看它是否有效。在您的示例中，您应该尝试

@Query(
    value = "SELECT new ir.server.component.panel.response." +
            "InvalidCardReaderDataDigestResponse(" +
            "    cr.driverNumber, cr.exploiterCode, cr.lineCode, " +
            "    cr.transactionDate, cr.offLoadingDate, " +
            "    cr.cardReaderNumber, " +
            "    sum(cr.count) , sum(cr.remind) " +
            ") " +
            "FROM CardReaderEntity cr " +
            "WHERE cr.company.id = :companyId " +
            "AND cr.status.id in :statusIds " +
            "AND cr.deleted = false " +
            "AND  (:fromDate::timestamp is null or cr.offLoadingDate >= :fromDate::timestamp ) " +
            "AND  (:toDate::timestamp   is null or cr.offLoadingDate <= :toDate::timestamp   ) " +
            "group by cr.driverNumber, cr.exploiterCode, cr.lineCode, cr.transactionDate, cr.offLoadingDate, cr.cardReaderNumber"
)

事实上，postgres 在大多数情况下不会要求类型，检查空值是需要类型的特殊情况之一。