希望得到大家的建议。我很喜欢 Spring boot 框架,但在使用 JPA 和 Hibernate 从祖 parent 中删除 parent 时遇到问题。
请注意,我的设置相当复杂,因此我将快速解释一下布局:
child (网站)可以拥有:
- 1 个产品(父级)
- 1 个提供商
- 许多价格( child )
父级(产品)可以有:
- 许多网站( child )
提供者可以有:
- 许多网站
价格可以有:
- 1 个网站(父网站)
所以这就像祖 parent -> parent -> child 的关系。我的问题是,如何在不删除祖 parent 和提供者的情况下删除 parent ?
这是我的类(class)布局:
祖 parent :
@Entity
@NoArgsConstructor(force = true)
@RequiredArgsConstructor
@Table(name = "product")
@Getter
@Setter
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@OneToMany(mappedBy = "product", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<Website> website;
}
父级:
@Entity
@NoArgsConstructor(force = true)
@RequiredArgsConstructor
@Table(name = "website")
@Getter
@Setter
public class Website {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@ManyToOne
@JoinColumn(name = "product_id")
private @NotNull Product product;
@ManyToOne
@JoinColumn(name = "provider_id")
private @NotNull Provider provider;
@OneToMany(mappedBy = "website", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
private List<Price> priceList;
}
提供商:
@Entity
@NoArgsConstructor(force = true)
@RequiredArgsConstructor
@Table(name = "provider")
@Getter
@Setter
public class Provider {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@JsonIgnore
@OneToMany(mappedBy = "provider", fetch = FetchType.EAGER)
private List<Website> website;
}
child :
@Entity
@NoArgsConstructor(force = true)
@RequiredArgsConstructor
@Table(name = "price")
@Getter
@Setter
public class Price {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@ManyToOne
@JoinColumn(name = "website_id")
private Website website;
}
Controller :
@Autowired
private IWebsiteRepository repository;
@RequestMapping(path = "/admin/delete/{id}", method = RequestMethod.POST)
public ModelAndView deletePost(@PathVariable("id") long id) {
repository.delete(id);
return new ModelAndView("redirect:/price/api/website/admin/");
}
存储库:
public interface IWebsiteRepository extends CrudRepository<Website, Long> {
Website findById(long id);
List<Website> findAll();
}
删除是此存储库的默认方法,但它不会删除网站。以下是当我点击删除 Controller 端点时从 Hibernate 输出的内容:
Hibernate: select website0_.id as id1_4_, website0_.date as date2_4_, website0_.product_id as product_4_4_, website0_.provider_id as provider5_4_, website0_.url as url3_4_ from website website0_
Hibernate: select product0_.id as id1_2_0_, product0_.activate as activate2_2_0_, product0_.date as date3_2_0_, product0_.name as name4_2_0_, website1_.product_id as product_4_4_1_, website1_.id as id1_4_1_, website1_.id as id1_4_2_, website1_.date as date2_4_2_, website1_.product_id as product_4_4_2_, website1_.provider_id as provider5_4_2_, website1_.url as url3_4_2_, pricelist2_.website_id as website_4_1_3_, pricelist2_.id as id1_1_3_, pricelist2_.id as id1_1_4_, pricelist2_.date as date2_1_4_, pricelist2_.price as price3_1_4_, pricelist2_.website_id as website_4_1_4_, provider3_.id as id1_3_5_, provider3_.colour as colour2_3_5_, provider3_.date as date3_3_5_, provider3_.name as name4_3_5_, provider3_.target_name as target_n5_3_5_ from product product0_ left outer join website website1_ on product0_.id=website1_.product_id left outer join price pricelist2_ on website1_.id=pricelist2_.website_id left outer join provider provider3_ on website1_.provider_id=provider3_.id where product0_.id=?
Hibernate: select product0_.id as id1_2_0_, product0_.activate as activate2_2_0_, product0_.date as date3_2_0_, product0_.name as name4_2_0_, website1_.product_id as product_4_4_1_, website1_.id as id1_4_1_, website1_.id as id1_4_2_, website1_.date as date2_4_2_, website1_.product_id as product_4_4_2_, website1_.provider_id as provider5_4_2_, website1_.url as url3_4_2_, pricelist2_.website_id as website_4_1_3_, pricelist2_.id as id1_1_3_, pricelist2_.id as id1_1_4_, pricelist2_.date as date2_1_4_, pricelist2_.price as price3_1_4_, pricelist2_.website_id as website_4_1_4_, provider3_.id as id1_3_5_, provider3_.colour as colour2_3_5_, provider3_.date as date3_3_5_, provider3_.name as name4_3_5_, provider3_.target_name as target_n5_3_5_ from product product0_ left outer join website website1_ on product0_.id=website1_.product_id left outer join price pricelist2_ on website1_.id=pricelist2_.website_id left outer join provider provider3_ on website1_.provider_id=provider3_.id where product0_.id=?
Hibernate: select website0_.provider_id as provider5_4_0_, website0_.id as id1_4_0_, website0_.id as id1_4_1_, website0_.date as date2_4_1_, website0_.product_id as product_4_4_1_, website0_.provider_id as provider5_4_1_, website0_.url as url3_4_1_, product1_.id as id1_2_2_, product1_.activate as activate2_2_2_, product1_.date as date3_2_2_, product1_.name as name4_2_2_ from website website0_ inner join product product1_ on website0_.product_id=product1_.id where website0_.provider_id=?
我希望这是有道理的
最佳答案
我想说没有 Activity 事务,没有事务 JPA 不会删除任何内容。
尝试将@Transactional添加到 Controller 中的deletePost。
关于java - 从父项中删除子项的 Spring Boot 问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46360143/