Spring Data Rest:"Date为null"查询抛出postgres异常

Question

我使用Spring Boot和Data Rest在Java8中创建一个简单的微服务并获得postgres异常.

我的实体:

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

我的存储库界面:

@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);
    ...
}

如果我调用".../findByXYZ？invoiceDate = 2016-02-22",我将收到以下错误消息:

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

但它有效,当我删除":invoiceDate IS NULL"部分.如果invoiceDate参数为null,我该如何检查？

Answer 1

我花了一些时间来研究这个，因为我真的想比较查询中的“日期为空”，这就是结果：

当您使用“ cast(foo.date as date) is null ”时，如果该字段不为空，则它可以正常工作。如果该字段为空，则抛出此异常：

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

解决方案是使用coalesce：

coalesce(:date, null) is null

无论是否有现场测试的数据，它都可以正常工作。

我的查询示例：

@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)"
        + "                 )"
        + "             )"
        + "       ) "

希望这对你有用！

Answer 2

我相信@Bonifacio 是正确的，因为 Postgres@Param("invoiceDate")在执行IS NULL测试时无法确定您的参数类型。我有与您类似的查询，它们在内存 H2 数据库中的行为与预期一致，但在 Postgres 集成测试中失败。

我能够通过将参数转换为日期来解决这个问题：

@Query(value = "SELECT ai FROM #{#entityName} ai WHERE "
    + "(:invoiceNumber IS NULL OR ai.invoiceNumber LIKE :invoiceNumber) AND "
    + "(cast(:invoiceDate as date) IS NULL OR ai.invoiceDate = :invoiceDate)" 
    )

Answer 3

当您将 JPA 与 Postgres 一起使用时，会出现一种奇怪的行为，当您想在稍后检查所需条件之前检查参数是否为 null 时，会导致错误。

发生该错误的原因是，在读取查询时，JPA 无法识别参数类型，然后在解释查询时引发错误。

解决方法是切换参数条件的位置，首先检查所需的条件是否为真，然后检查参数是否为空。

这样，JPA 将能够识别正确的参数类型，并且不会再次引发错误。

尝试以下查询并查看它是否有效：

@Query(value = "SELECT ai FROM #{#entityName} ai WHERE "
    + "(:invoiceNumber IS NULL OR ai.invoiceNumber LIKE :invoiceNumber) AND "
    + "(ai.invoiceDate = :invoiceDate OR :invoiceDate IS NULL)" 
    )