Question

我有两个实体：客房和服务。我也想在ServiceController类中使用Logic类中的方法。其他课程无关紧要。

room.getBeds（）始终返回0，默认为int值。

房间实体：

@Entity
public class Room {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int room_id;

    private int beds;
    private int number;

    public Room() {
    }

    public Room(int beds, int number) {
        this.beds = beds;
        this.number = number;
    }

    public int getRoom_id() {
        return room_id;
    }

    public void setRoom_id(int room_id) {
        this.room_id = room_id;
    }

    public int getBeds() {
        return beds;
    }

    public void setBeds(int beds) {
        this.beds = beds;
    }

    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
    }
}

服务实体：

@Entity
public class Service {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)

    private int service_id;

    @JsonFormat(pattern = "dd/MM/yyyy", timezone = "Europe/Berlin")
    private Date arrival_at;

    @JsonFormat(pattern = "dd/MM/yyyy", timezone = "Europe/Berlin")
    private Date departure_at;

    private int meals;
    private int guest_id;
    private double price;

    public int getService_id() {
        return service_id;
    }

    public void setService_id(int service_id) {
        this.service_id = service_id;
    }

    public Date getArrival_at() {
        return arrival_at;
    }

    public void setArrival_at(Date arrival_at) {
        this.arrival_at = arrival_at;
    }

    public Date getDeparture_at() {
        return departure_at;
    }

    public void setDeparture_at(Date departure_at) {
        this.departure_at = departure_at;
    }

    public int getMeals() {
        return meals;
    }

    public void setMeals(int meals) {
        this.meals = meals;
    }

    public int getGuest_id() {
        return guest_id;
    }

    public void setGuest_id(int guest_id) {
        this.guest_id = guest_id;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

服务控制器：

@RestController
public class ServiceController {

@Autowired
ServiceRepository serviceRepository;
private Logic logic = new Logic();
private Room room = new Room();

//CREATE
@PostMapping("/services")
public int createService(@RequestBody Service service) {

    service.setPrice(logic.calculatePrice(service.getArrival_at(), service.getDeparture_at(), room.getBeds(), service.getMeals()));

    return serviceRepository.save(service);
}
}

如何从room.getBeds（）getter获取正确的值？

Answer 1

Lerius，您只是在创建“房间实体”的新对象，而没有将数据库中的任何值填充到该对象这就是为什么要占用room.getBeds（）;的原因。为0（即int的默认值）尝试将DB值填充到您的对象之后，您将可以获取getBeds（）的值；

JPA-从Controller类中其他实体的字段获取值

1 个答案: