我已经为按特定列分组的存储库方法编写了 native 查询。
我无法按 id
进行分组,因为这会破坏分组。
@Query(nativeQuery = true, value = "SELECT description, model_year, take_rate, number " +
"FROM foo f " +
"INNER JOIN bar b " +
"ON b.cycle_plan_code = b.cycle_plan_code " +
"WHERE b.programme = :programme " +
"AND b.build_event = :buildEvent " +
"AND f.vehicle_line = :vehicleLine " +
"GROUP BY description, take_rate, model_year, number")
List<FooEntity> findAllFooByBar(@Param("vehicleLine") String vehicleLine, @Param("programme") String programme,
@Param("buildEvent") String buildEvent);
我的实体有一个 @Id
列和其他一些列
@Table(name = "foos")
public class FooEntity {
@Id
private Long id;
@Column(name = "cycle_plan_code")
private String cyclePlanCode;
@Column(name = "model_year")
private String year;
@Column(name = "vehicle_line", nullable = true)
private String vehicleLine;
@Column(name = "number")
private Integer number;
@Column(name = "description")
private String description;
@Column(name = "take_rate")
private double takeRate;
}
访问存储库方法时会引发 hibernate
o.h.engine.jdbc.spi.SqlExceptionHelper : Column 'id' not found.
我试图通过将其添加到 select 子句来破解它
选择 0 作为 ID
此过程继续进行,但随后它提示查询没有返回实体 vehicle_line
、 model_year
的其他列
我必须将它们全部添加到查询中才能使其正常工作。
我在注释中尝试了 nullable = true
标志,但这不允许我从 select 子句中省略列。
如何返回仅返回我感兴趣的部分列的实体?
最佳答案
尝试使用投影: 声明一个带有所需字段的 getter 的接口(interface):
public interface SubFooEntity{
String getDescription();
String getModelYear();
Double getTakeRate();
Integers getNumber();
}
将存储库方法更改为以下:
@Query("SELECT description, modelYear, takeRate, number " +
"FROM foo f " +
"INNER JOIN bar b " +
"ON b.cyclePlanCode = b.cyclePlanCode " +
"WHERE b.programme = :programme " +
"AND b.build_event = :buildEvent " +
"AND f.vehicle_line = :vehicleLine " +
"GROUP BY description, takeRate, modelYear, number")
List<SubFooEntity> findAllFooByBar(@Param("vehicleLine") String vehicleLine, @Param("programme") String programme,
@Param("buildEvent") String buildEvent);
更多信息请点击:https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#projections
关于java - Hibernate查询方法需要在查询中返回所有列吗?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53543852/