如何在 Spring Data JPA 中查找具有 OneToMany 关系的队列

Question

我使用 Spring Data JPA 并且有两个实体：

@Entity
@Data
@Table(name="vehicle_entity")
public class Vehicle {
    @Id
    @GeneratedValue
    private Integer id;
    private String type;
    private String vehicleRegNumber;
    @OneToMany(targetEntity = com.transport.model.BookedTime.class, fetch=FetchType.EAGER)
    @JoinColumn(name="bookingTime", referencedColumnName="id")
    Set<BookingTime> bookingTime;
}

和

@Entity
@Data
@Table(name="booked_time")
public class BookedTime {
    @Id
    @GeneratedValue
    Integer id;
    Long startPeriod;
    Long finishPeriod;

}

和存储库：

public interface VehicleRepository extends JpaRepository<Vehicle, Integer> {

   @Query("correct query")
    List<Vehicle> findAllByPeriod(@Param("startPeriod") int startPeriod, @Param("endPeriod") int endPeriod);
}

我需要查找未按时间预订的可用车辆。我该怎么做？

Answer 1

我会选择这样的东西：

 @Query(nativeQuery=true, value = "select * from vehicle_entity v join booked_time b on b.vehicle = v.id where not (b.startPeriod > :startPeriod and b.endPeriod < :endPeriod)"

顺便说一句，我想您可能想尝试将 EAGER 的 FetchType 更改为 bookingTime 的 LAZY，然后在 select 查询中使用 join fetch。

Answer 2

所以我找到了我的问题的几种解决方案。第一个由 Enigo 提供，第二个：

   @Query(nativeQuery = false, value = "select v from Vehicle v right join fetch v.bookedTime b \n" +
           "Where b.vehicle = v.id " +
           "AND (b.startPeriod < :startPeriod OR b.startPeriod > :finishPeriod) " +
           "AND (b.finishPeriod < :startPeriod OR b.finishPeriod > :finishPeriod)")
   Set<Vehicle> findAllByPeriod(@Param("startPeriod") Long startPeriod, @Param("finishPeriod") Long finishPeriod);

如何在 Spring Data JPA 中查找具有 OneToMany 关系的队列

How to find cortege with OneToMany relation in Spring Data JPA

java

spring

jpa

spring-data-jpa