我有两个实体,父实体(实体)具有历史记录实体列表,当我从子实体列表(历史记录)中删除旧行时,我希望冬眠对子实体行执行删除操作,但是休眠将外键更新为item.getHistories().remove(0)
。
此更新将引起NOT NULL VIOLATION,因此外键具有null
约束。
这是我的父实体:
@Data
@EqualsAndHashCode(callSuper = true)
@Entity
@Table(name = "item", schema = "public", catalog = "foo")
public class RepricingItem extends BaseDatesEntity {
@Id
@SequenceGenerator(name="item_id_seq", sequenceName = "item_id_seq", allocationSize = 5)
@GeneratedValue(strategy = SEQUENCE, generator = "item_id_seq")
@Column(name = "id", unique = true, insertable = true, updatable = false, nullable = false)
protected Long id;
@Size(min = 1, max = 100)
@Column(name = "title", nullable = false, insertable = true, updatable = true)
private String title;
@OneToMany(fetch = LAZY, cascade = ALL, orphanRemoval = true)
@JoinColumn(name = "item_id")
private List<ItemHistory> histories;
}
这是孩子:
@Data
@EqualsAndHashCode(callSuper=true)
@Entity
@Table(name = "item_history", schema = "public", catalog = "foo")
public class RepricingItemBuyBoxHistory extends BaseEntity {
@ManyToOne(fetch = LAZY, optional = false)
@JoinColumn(name = "item_id", nullable = false, updatable = false)
private RepricingItem repricingItem;
@Size(min = 1, max = 255)
@Column(name = "some_history_data", nullable = false, insertable = true, updatable = false)
private String someHistoryData;
}
这是具有非null约束的历史记录表:
CREATE TABLE "item_history" (
id BIGSERIAL PRIMARY KEY,
item_id BIGINT NOT NULL REFERENCES "item" (id) ON DELETE CASCADE,
inserted TIMESTAMP WITHOUT TIME ZONE,
updated TIMESTAMP WITHOUT TIME ZONE,
some_history_data VARCHAR(255) NOT NULL
) WITH (OIDS =FALSE);
这是hibernate生成的update子句:
11:17:00,794 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] SQL Error: 0, SQLState: 23502
11:17:00,794 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] Batch entry 0 update foo.public.item_history set item_id=null where item_id=903372 and id=245 was aborted. Call getNextException to see the cause.
我该如何告诉Hibernate删除子项,而不是尝试删除该关系。
最佳答案
我认为您需要在RepricingItem中的@OneToMany批注中添加一个'mappedBy'属性。我想是这样的:
@OneToMany(fetch = LAZY, cascade = ALL, orphanRemoval = true, mappedBy = "repricingItem")
@JoinColumn(name = "item_id")
private List<ItemHistory> histories;
问题与哪个实体是“所有者”有关。比我能提供的更好的解释可以在这里找到:
inverse = “true” example and explanation