如何在 JPQL 中将日期时间转换为日期？

这段代码有什么问题？

@Query(value = "Select " +
    "date(ivd.trnDatetime) as date, " +
    "ivd.binNo as bin, " +
    "ivd.snNo as sn, " +
    "count(ivd.invoiceNo) as totInvoice, " +
    "sum(ivd.totSaleAmt) as totSaleAmt " +
    "from InvoiceData ivd where ivd.status = 1 group by date(ivd.trnDatetime), ivd.binNo, ivd.snNo")
List<Object[]> getDailyTransactionReport();

它抛出

    java.lang.IllegalArgumentException: org.hibernate.QueryException: No data type for node: org.hibernate.hql.internal.ast.tree.MethodNode 
 +-[METHOD_CALL] MethodNode: '('
 |  +-[METHOD_NAME] IdentNode: 'date' {originalText=date}
 |  \-[EXPR_LIST] SqlNode: 'exprList'
 |     \-[DOT] DotNode: 'invoicedat0_.transaction_at' {propertyName=trnDatetime,dereferenceType=PRIMITIVE,getPropertyPath=trnDatetime,path=ivd.trnDatetime,tableAlias=invoicedat0_,className=com.efdms.transactionmonitoring.domain.InvoiceData,classAlias=ivd}
 |        +-[ALIAS_REF] IdentNode: 'invoicedat0_.id' {alias=ivd, className=com.efdms.transactionmonitoring.domain.InvoiceData, tableAlias=invoicedat0_}
 |        \-[IDENT] IdentNode: 'trnDatetime' {originalText=trnDatetime}
 [Select date(ivd.trnDatetime) as date, ivd.binNo as bin, ivd.snNo as sn, count(ivd.invoiceNo) as totInvoice, sum(ivd.totSaleAmt) as totSaleAmt from com.efdms.transactionmonitoring.domain.InvoiceData ivd where ivd.status = 1 group by date(ivd.trnDatetime), ivd.binNo, ivd.snNo]
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:138)
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188)
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:729)
    at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:23)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:351)
    at com.sun.proxy.$Proxy190.createQuery(Unknown Source)
    at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:87)
    ... 62 common frames omitted

该物业为trnDatetime在实体中

@NotNull
@Column(name = "transaction_at", nullable = false)
private Instant trnDatetime;

Sql Server 中的等效列是datetime

JPQL不支持date()因此您的查询失败。您有以下选项：

1. 通过设置更改为使用本机 SQLnativeQuery=true in @Query
2. 如果您使用 Hibernate ，请使用 HQL 特定的cast() https://docs.jboss.org/hibernate/orm/5.4/userguide/html_single/Hibernate_User_Guide.html#hql-functions那个演员trnDatetime to LocalDate :

select cast(ivd.trnDatetime as LocalDate) as date ,
       count(ivd.invoiceNo) as totInvoice 
       from InvoiceData ivd 
       where ivd.status = 1 
       group by cast(ivd.trnDatetime as LocalDate)"

_{I ignore other columns for the sake of brevity}

请注意，结果列表中每一项的索引 0 都是一个LocalDate