Spring Data REST：“date is null”查询引发postgres异常

Question

@Entity
public class ArchivedInvoice implements Serializable {
    ...
    @Column
    private String invoiceNumber;
    @Column
    private java.sql.Date invoiceDate;
    ...
}

@RepositoryRestResource(collectionResourceRel = "archivedinvoices", path = "archivedinvoices")
public interface ArchivedInvoiceRepository extends PagingAndSortingRepository < ArchivedInvoice, Long > {
    ...
@RestResource(rel = "findByXYZ", path = "findByXYZ")
@Query(value = "SELECT ai FROM #{#entityName} ai WHERE "
        + "(:invoiceNumber IS NULL OR ai.invoiceNumber LIKE :invoiceNumber) AND "
        + "(:invoiceDate IS NULL OR ai.invoiceDate = :invoiceDate)" 
        )
public Page < ArchivedInvoice > findByXYZ(
        @Param("invoiceNumber") @Nullable String invoiceNumber,
        @Param("invoiceDate") @Nullable Date invoiceDate,
        Pageable p);
    ...
}

org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet
...
Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet
...
Caused by: org.postgresql.util.PSQLException: FEHLER: could not determine data type of parameter

Answer 1

我花了一些时间看这个，因为我真的想比较查询中的“日期为空”，结果是：

当您使用“cast（foo.date as date）is null”时，如果字段不是null，它就可以工作。如果字段为null，则抛出此异常：

org.postgresql.util.PSQLException: ERROR: cannot cast type bytea to date

解决方案是使用合并：

coalesce(:date, null) is null

@Query("SELECT c "
        + " FROM Entity c "
        + " WHERE "
        + "       and ( (coalesce(:dateFrom, null) is null and coalesce(:dateUntil, null) is null) "
        + "             or ((coalesce(c.date, null) is not null) "
        + "                 and ( "
        + "                        ((coalesce(:dateFrom, null) is null and coalesce(:dateUntil, null) is not null) and c.date <= :dateUntil) "
        + "                     or ((coalesce(:dateUntil, null) is null and coalesce(:dateFrom, null) is not null) and c.date >= :dateFrom)"
        + "                     or (c.date between :dateFrom and :dateUntil)"
        + "                 )"
        + "             )"
        + "       ) "