我正在尝试使用select max
和where
和@Query
来写查询
以下内容无效,该如何解决?
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
@Repository
interface IntermediateInvoiceRepository extends JpaRepository<Invoice, String> {
@Query("SELECT max(i.sequence) " +
"FROM Invoice as i " +
"WHERE i.fleetId = :fleetId" +
" AND i.sequence IS NOT NULL")
Long findMaxSequence(@Param("fleetId") String fleetId);
}
我遇到了另一个答案,但是它显式地使用了实体管理器,这并不相同
How do I write a MAX query with a where clause in JPA 2.0?
错误是:
2018-09-14T09:27:57,180Z [main] ERROR o.s.boot.SpringApplication - Application startup failed
org.springframework.data.mapping.PropertyReferenceException: No property findMaxSequence found for type Invoice!
发票类别(为简便起见,已简化):
@Entity
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
@Table(name = "invoices", indexes = {
@Index(name = "IDX_FLEET", columnList = "fleetId", unique = false)
,
@Index(name = "IDX_USERSSS", columnList = "userId", unique = false)
,
@Index(name = "IDX_TIME", columnList = "invoiceDate", unique = false)
,
@Index(name = "IDX_SEQUENCE", columnList = "sequence", unique = false)
})
@JsonIgnoreProperties(ignoreUnknown = true)
public class Invoice implements Serializable {
private static final long serialVersionUID = 1L;
@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid2")
@Column(columnDefinition = "CHAR(36)")
@Id
private String id;
@Column
private long sequence;
...
更新:
可能是findOne的变通方法,序列上具有DESC排序 专栏?
@Query(“ SELECT i.sequence” + “作为我的发票” + “ WHERE i.fleetId =:fleetId” + “按i.sequence DESC排序”) 长getMaxSequence(@Param(“ fleetId”)字符串FleetId);
但是我需要以某种方式将结果集限制为1
更新2:
修复了import org.springframework.data.jpa.repository.Query;
仍然存在的错误
答案 0 :(得分:0)
由于您使用的是JPA存储库,请使用:
org.springframework.data.jpa.repository.Query
注释而不是
org.springframework.data.mongodb.repository.Query
您可以创建查询方法,而无需使用@Query注释,例如:
发票findFirstByFleetIdOrderBySequenceDesc(String FleetId);
返回您需要的发票。