无法删除或更新父行：外键约束失败 (jpa 2.0)

Question

当我尝试从数据库中删除一行时，我收到以下错误消息：“无法删除或更新父行：外键约束失败 (pquino01db.ITINERARYTRAVELLER_FLIGHTENTITY, CONSTRAINT FK_ITINERARYTRAVELLER_FLIGHTENTITY_flights_ID FOREIGN KEY ( flights_ID) 参考FLIGHTENTITY (ID))"

@Entity
public class itineraryTraveller implements Serializable {

private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String departureLocation;
@Temporal(javax.persistence.TemporalType.DATE)
private Date departureDate;
private String arrivalLocation;
private double cost;
private char status;
private ArrayList<String> stops;
@OneToMany(orphanRemoval=true)
private ArrayList<flightEntity> flights;
private String stopPrint;
private String userName;
private int iden;
public String getUserName() {
    return userName;
}
........

有人能看出问题吗？？？我认为我的 @OneToMany 注释可能遗漏了一些东西，但不知道是什么

Answer 1

试试这个：

@OneToMany(cascade = CascadeType.ALL, mappedBy = "flightID", orphanRemoval = true)
private ArrayList<flightEntity> flights;

“flightID”必须等于fligtEntity的实体id的变量名。

关于 mappedBy 这里的文档Bidirectional Relationships。

您可以在这里看到 CascadeType.ALL 的含义Cascade Operations and Relationships。