[英]Spring DATA JPA example for multiple foreign keys in a single entity
[英]Create an Entity Class with two foreign keys - Spring JPA
如何为下表创建实体 class ,该表具有两个不同表的两个外键。
CREATE TABLE `flights_info` (
`airline_id` bigint(20) NOT NULL,
`flight_infoid` bigint(20) NOT NULL,
UNIQUE INDEX `UK_mnghyk14c0ufcb2gs2k6fab40`(`flight_infoid`) ,
INDEX `FKm5m2579nqtr1wele0bimvme8m`(`airline_id`) ,
CONSTRAINT `FKlda61sltnw69kxw7b0gx6sj5s` FOREIGN KEY (`flight_infoid`) REFERENCES `flight_info` (`flight_infoid`) ON DELETE RESTRICT ON UPDATE RESTRICT,
CONSTRAINT `FKm5m2579nqtr1wele0bimvme8m` FOREIGN KEY (`airline_id`) REFERENCES `airline_info` (`airline_id`) ON DELETE RESTRICT ON UPDATE RESTRICT
);
我的实体 class:
@Entity
public class FlightsInfo {
@Id
@JoinTable(name="AirlineInfo", joinColumns=@JoinColumn(name="airline_id"))
private AirlineInfo airline_id;
@OneToOne
@JoinColumn(name="flight_infoid")
private FlightInfo flight_infoid;
}
问题是您的表没有主键。 所以很难将@Id
注释指向右列。 JPA 但是,只要您有一个唯一的列,就可以接受没有 PK 的表: https://en.wikibooks.org/wiki/Java_Persistence/Identity_and_Sequencing#No_Primary_Key
幸运的是,您在flight_infoid
列上有一个独特的约束,因此您应该尝试指向您的@Id
注释。
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