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”,我会收到以下错误消息:
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
但是当我删除“:invoiceDate IS NULL”部分时,它起作用了。如何检查发票日期参数是否为空?
我花了一些时间研究这个,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,如果字段不为空,则可以正常工作。如果该字段为空,则会抛出此异常:
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
无论有或没有现场测试数据,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)"
+ " )"
+ " )"
+ " ) "
希望它对你有用!
我相信@Bonifacio是正确的,因为Postgres在执行
@Param("invoiceDate")
测试时无法确定你的IS NULL
参数的类型。我有与您类似的查询,它们在内存 H2 数据库中的行为符合预期,但在 Postgres 集成测试中失败。
我可以通过将参数转换为日期来解决这个问题,如下所示:
@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)"
)
在 postgres 9.5 中,我对 LocalDateTime 类型的字段和 Timestamp 字段也有类似的问题。 我解决了它,像这样转换它:
@Query("SELECT c "
+ "FROM Contract c "
+ "WHERE "
+ "(:idContract IS NULL OR c.idContract = :idContract) AND "
+ "(CAST(:dtCancelInitial AS java.time.LocalDateTime) IS NULL OR (c.dtCancel >= :dtCancelInitial AND c.dtCancel < :dtCancelFinal)) "
+ "ORDER BY c.idContract")
List<Contract> findContratConsultaCancelamento(@Param("idContract") Long idContract, @Param("dtCancelInitial") LocalDateTime dtCancelInitial, @Param("dtCancelFinal") LocalDateTime dtCancelFinal);
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空时,会导致错误。
发生错误的原因是,在读取查询时,JPA 无法识别参数类型是什么,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,看看它是否有效:
@Query(value = "SELECT ai FROM #{#entityName} ai WHERE "
+ "(:invoiceNumber IS NULL OR ai.invoiceNumber LIKE :invoiceNumber) AND "
+ "(ai.invoiceDate = :invoiceDate OR :invoiceDate IS NULL)"
)
以下对我有用
@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)"
)