Question

我是hibernate的新手。所以，我不知道该怎么做：

我有3张桌子：

表人：

@Entity
@Table(name = "ASD_PERSON")
public class AsdPerson implements Serializable {
    @Id
    @SequenceGenerator(name="seq_name", sequenceName="gen_id_value", allocationSize = 1)
    @GeneratedValue(generator="seq_name")
    @Column(name="F_PERSON_ID", nullable = false)
    private Long fPersonId;

    @OneToMany(mappedBy = "AsdPerson",
               cascade = CascadeType.ALL,
               orphanRemoval = true)
    private List<AsdPersonEvent> asdPersonEventList;

    ... setters and getters ...
}

表事件：

@Entity
@Table(name = "ASD_EVENT")
public class AsdEvent implements Serializable {
    @Id
    @SequenceGenerator(name="seq_name", sequenceName="gen_id_value", allocationSize = 1)
    @GeneratedValue(generator="seq_name")
    @Column(name="F_EVENT_ID", nullable = false)
    private Long fEventId;

    @OneToMany(mappedBy = "AsdEvent",
               cascade = CascadeType.ALL,
               orphanRemoval = true)
    private List<AsdPersonEvent> asdPersonEventList;

    ... setters and getters ...
}

表人事件：

@Entity
@Table(name = "ASD_PERSON_EVENT")
@IdClass(AsdPersonEventPK.class)
public class AsdPersonEvent implements Serializable {
    @Id
    @GenericGenerator(name = "generator", strategy = "foreign",
                      parameters = @Parameter(name = "property", value = "asdPerson"))
    @GeneratedValue(generator = "generator")
    @Column(name="F_PERSON_ID", nullable = false, insertable = false,
            updatable = false)
    private Long fPersonId;

    @Id
    @GenericGenerator(name = "generator", strategy = "foreign",
                      parameters = @Parameter(name = "property", value = "asdEvent"))
    @GeneratedValue(generator = "generator")
    @Column(name="F_EVENT_ID", nullable = false, insertable = false,
            updatable = false)
    private Long fEventId;

    @ManyToOne
    @JoinColumn(name = "F_PERSON_ID", insertable = false,
                updatable = false)
    private AsdPerson asdPerson;

    @ManyToOne
    @JoinColumn(name = "F_EVENT_ID", insertable = false,
                updatable = false)
    private AsdEvent asdEvent;

    ... setters and getters ...
}

当我尝试从Event表或Person表中删除相关记录时，除了大小写之外，一切都完美无缺（添加新记录，创建新对象）：

...
AsdEvent ev = getService().get(115); // get record from Event table by id = 115 (for example)
ev.getAsdPersonEventList().remove(1); // delete some existing records
getService().merge(ev);
...

之后我收到错误：

删除的对象将被重新保存级联（从中删除已删除的对象）协会）： [database.AsdPersonEvent#database.AsdPersonEventPK@12908fc]

如何使用注释或其他方法配置Hibernate以消除此错误？

Answer 1

如果您有持久实体的复杂图表，我认为您需要放弃使用orphanRemoval并使用em.remove()手动删除您的实体。

orphanRemoval是为简单的父子关系而设计的，其中没有父母，孩子就没有意义。如果在你的情况下，孩子可能有更好的关系，也许这对orphanRemoval来说不是一个好例子。

Answer 2

删除orphanRemoval = true

再试一次

Hibernate：使用外键从关联表中删除记录

2 个答案: