使用CascadeType.ALL的JPA外鍵約束

Question

我有2個實體

那是第一個實體

public class Manager {

    // ...

    @OneToMany(mappedBy = "manager", cascade = CascadeType.ALL)
    @LazyCollection(LazyCollectionOption.FALSE)
    private List<ExpertAndRequest> requests;

    // ...

}

第二實體。 這是兩個實體的綁定表。

@Entity
@Data
@Table(name = "SOME_TABLE_NAME")
@IdClass(ExpertAndRequestId.class)
public class ExpertAndRequest implements Serializable {

    @Id
    private Long managerId;

    @Id
    private Long requestId;


    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "managerId", updatable = false, insertable = false, referencedColumnName = "id")
    private Manager manager;


    @ManyToOne
    @JoinColumn(name = "requestId", updatable = false, insertable = false, referencedColumnName = "id")
    private ParticipantRequest request;



}

所以我從表中刪除數據

this.managerRepository.delete(manager);        

我得到異常：

org.h2.jdbc.JdbcSQLException: Referential integrity constraint violation

我究竟做錯了什么？

---

編輯 ：

我更新了上面的課程。

這是IdClass

@Data
public class ExpertAndRequestId implements Serializable {

    private long managerId;
    private long requestId;


    public int hashCode() {
        return (int)(managerId + requestId);
    }

    public String toString() {

        return String.format("ExpertAndRequestId [expert = \"%s\", request=\"%s\"]", this.managerId, this.requestId);

    }

    public boolean equals(Object object) {
        if (object instanceof ExpertAndRequestId) {
            ExpertAndRequestId otherId = (ExpertAndRequestId) object;
            return (otherId.requestId == this.requestId) && (otherId.managerId == this.managerId);
        }
        return false;
    }

}

第三實體

public class ParticipantRequest {

    // ...

    @OneToMany(mappedBy = "request", cascade = CascadeType.ALL)
    @LazyCollection(LazyCollectionOption.FALSE)
    private List<ExpertAndRequest> experts;

    // ...

}

我從https://en.wikibooks.org/wiki/Java_Persistence/ManyToMany獲得的示例

Answer 1

當您在父實體Manager和ExpertAndRequest之間建立雙向關系時，您需要的是CascadeType.REMOVE （或CascadeType.ALL，其中包括REMOVE）：您對Hibernate說：“如果父實體被刪除，請刪除子實體”。 在這里進行llo了解如何同時使用CascadeType.REMOVE和orphanRemoval

Answer 2

嘗試使用cascade = {CascadeType.PERSIST, CascadeType.MERGE}而不是cascade = CascadeType.ALL並以該站點為參考。