我将Spring Boot 2和Spring Data与Hibernate实现结合使用。
使用的数据库是Postgres
我尝试将CarServices与它的子CarComponentOccurrences保存在一起：
@Entity
public class CarServices{
@OneToMany(mappedBy = "carService", cascade = CascadeType.PERSIST)
private List<CarComponentOccurrences> carComponentOccurrences;
}
@Entity
public class CarComponentOccurrences {
...
@ManyToOne
private CarComponents carComponent;
@ManyToOne
private CarServices carService;
}
CarComponentOccurrences已保存，但在数据库CarComponents中且CarService为空。在
CarComponentOccurrences中，设置了CarComponents和CarService。编辑：
在我的服务层
@Autowired
private CarServicesRepository repository;
public void save(){
CarServices cs = new CarServices();
cs.setName("name");
List<CarComponentOccurrences> carComponentOccurrences = new ArrayList<>();
CarComponentOccurrences cco = new CarComponentOccurrences();
Optional<CarComponents> optCarComponents =carComponentsRepository.findById(1);
if (optCarComponents.isPresent()) {
cco.setCarComponentOccurrences(optCarComponents.get());
}
cco.CarServices(cs);
carComponentOccurrences.add(cco);
cs.setCarComponentOccurrences(carComponentOccurrences);
repository.save(cs);
}
编辑2
CREATE TABLE car_component_occurrences
(
id integer NOT NULL,
...
car_component_id integer,
car_service_id integer,
CONSTRAINT car_component_occurrences_pkey PRIMARY KEY (id),
CONSTRAINT fka4fmpytg0s9a94377pdw5ssib FOREIGN KEY (car_service_id)
REFERENCES car_services (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT fko85tjs5s6f1o9u7kkk152d147 FOREIGN KEY (car_component_id)
REFERENCES car_components (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
编辑3
Hibernate:
select
nextval ('public.car_component_occurrences_id_seq')
Hibernate:
insert
into
public.car_component_occurrences
( car_component_id, car_service_id, name, id)
values
(?, ?, ?, ?)
Hibernate:
update
public.car_services
set
name=?,
where
id=?
最佳答案
尝试：
在CarServices中：
级联= CascadeType.PERSIST-> PERSIST，MERGE
在CarComponentOccurrences中：
@ManyToOne私人CarComponents carComponent; -> @ManyToOne（cascade = CascadeType.PERSIST）
让我知道是否有帮助。