java - 使用 CascadeType.ALL 的 JPA 外键约束

Question

我有 2 个实体

这是第一个实体

public class Manager {

    // ...

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

    // ...

}

第二个实体。这是两个实体的绑定(bind)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;



}

所以我从表中删除数据

this.managerRepository.delete(manager);        

我得到了异常(exception):

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

我做错了什么？

<小时/>

编辑:

我更新了上面的类(class)。

这是 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;
    }

}

第三个实体

public class ParticipantRequest {

    // ...

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

    // ...

}

我取自 https://en.wikibooks.org/wiki/Java_Persistence/ManyToMany 的示例

Answer 1

由于父实体 Manager 和子实体 ExpertAndRequest 之间存在双向关系，因此您需要的是 CascadeType.REMOVE (或 CascadeType.ALL，其中包括 REMOVE):您对 Hibernate 说“如果删除了父实体，请也删除子实体”。拍个照here了解如何使用 CascadeType.REMOVE 和 orphanRemoval