Java 当子实体被删除时,Hibernate会执行更新而不是删除操作
当我从子列表(历史记录)Java 当子实体被删除时,Hibernate会执行更新而不是删除操作,java,hibernate,jpa,Java,Hibernate,Jpa,当我从子列表(历史记录)item.getHistories()中删除一个旧的行时,我有两个实体,父(项)有一个历史记录实体列表。删除(0),我希望hibernate对子行执行一个delete操作,但hibernate将外键更新为null。 此更新导致非空冲突,因此外键具有非空约束 这是我的父实体: @Data @EqualsAndHashCode(callSuper = true) @Entity @Table(name = "item", schema = "public", catalog
item.getHistories()中删除一个旧的行时,我有两个实体,父(项)有一个历史记录实体列表。删除(0)
,我希望hibernate对子行执行一个delete操作,但hibernate将外键更新为null
。
此更新导致非空冲突,因此外键具有非空
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;
}
这是具有not 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.
我如何告诉hibernate删除子项而不是尝试删除关系。我认为您需要在replicingItem中的@OneToMany注释中添加一个“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;
@OneToMany(fetch=LAZY,cascade=ALL,orphaneremovation=true,mappedBy=“replicingitem”)
@JoinColumn(name=“item\u id”)
私人名单历史;
问题在于哪个实体是“所有者”。在这里可以找到比我能给出的更好的解释:
在双向映射中,您必须处理关系的两侧。删除bot侧没有帮助,hibernates仍会发出更新命令:History entryToDelete=item.getHistories().get(0);replicingItem.getHistories().remove(entryToDelete);会话。删除(entryToDelete);session.flush();我想问题出在地图上我在这里解释了我的解决方案:。
@OneToMany(fetch = LAZY, cascade = ALL, orphanRemoval = true, mappedBy = "repricingItem")
@JoinColumn(name = "item_id")
private List<ItemHistory> histories;