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，出现此错误消息：“无法删除或更新父行：外键约束失败（pquino01db。ITINERARYTRAVELLER_FLIGHTENTITY，约束FK_ITINERARYTRAVELLER_FLIGHTENTITY_flights_ID外键（flights_ID）参考文献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; 
} 
........ 

有人能看到的问题???我想我的@OneToMany批注可能失去了一些东西，但不知道什么

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。

有关映射的文档，请点击这里Bidirectional Relationships。

你可以看到CascadeType.ALL在这里意味着什么Cascade Operations and Relationships。