java - OnetoOne 关系案例中的唯一行。如何防止重复？

Question

我对代码有疑问。我希望这些行是唯一的。对于飞行，我只使用 @UniqueConstraint 注释，效果很好。

但是，就酒店而言，他向我的数据库写入了一个副本。

我怀疑这是因为表是通过一对一关系连接的。

我保证你必须在飞行舱位中写它，而不是在酒店中。

@Entity
@Component
@Table(name = "Flight", uniqueConstraints = @UniqueConstraint(columnNames = {"departure","currency","destination","price","flightnumber","airline","departuretime","returntime","expiresAt","userName","airlineIata" }))
public class Flight {

    private Long id;

    private String departure;

    private String currency;

    private String destination;

...等

@Entity
@Component
@Table(name = "Hotel", uniqueConstraints = @UniqueConstraint(columnNames = {"site","rating","phone","name","longitude","latitude","image3","image2","image","hotelLink","describe","currency","category","address","price" }))

public class Hotel {

    private Long id;
    private String name;
    private String currency;
    private String site;
    private BigDecimal price;
    private String address;
    private Double rating;
    private String image;
    private String image2;
    private String image3;
    private String hotelLink;
    private String phone;
    private String describe;
    private String latitude;
    private String longitude;
    private String category;

setter/getter ...和 setter/getter ...

some code....

  hotel.setPrice(hotelCurrencyService.amountCalculator(array.getVendor3Price(), exchangeRate));

flight.setDeparture(flightDTO.getDeparture()); 一些代码......

 flight.setHotel(hotel);
 flightRepository.save(flight);

Answer 1

这家酒店以前保存过吗？或者保存方法保留两个实体(航类和酒店)？在我的项目中，我会尝试从数据库获取对象，然后，如果该对象已经存在，我会实现更新或中止规则。