Deleting entity in Spring JPA

问题

There are two entities with relation @ManyToOne and @OneToMany (Categories and Products). When I enabeling (cascade=CascadeType.ALL) one record in Products pulls for deleting one Category, and that is BAD. What must be do for this entities that result is only deleting occurs in one place(Table) without cascade(related) delete for another reference??? I am using Spring 5.1.5 (not Spring Boot) Thank you!

SPRING 5 / TOMCAT 9 / JACKSON-DATABIND / spring-data-jpa 2.1.5 / persistence-api 1.0.2 / Hibernate-core 5.4.1

@Entity public class Category {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="CAT_ID")
private Long id;

@Column(name="CAT_NAME")
private String name;

@JsonManagedReference
@OneToMany(cascade=CascadeType.ALL,fetch = FetchType.EAGER)
@JoinColumn(name="CAT_ID")
@OrderBy
private Set<Product> products = new HashSet<>();

public Long getId() {
    return id;
}

@Entity public class Product {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="PRODUCT_ID")
    private Long id;

    @Column(name="PRODUCT_NAME")
    private String name;

    @JsonBackReference
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name="CAT_ID")
    private Category category;

    public Long getId() {
        return id;
    }

@RequestMapping(value="/categories/{categoryId}/products/{productId}", method=RequestMethod.DELETE) public ResponseEntity deleteById(@PathVariable Long categoryId, @PathVariable Long productId) { productService.deleteProductById(productId); return new ResponseEntity<>(HttpStatus.OK); }

@Transactional
@Override
public void deleteProductById(Long productId) {
    // TODO Auto-generated method stub
    productRepository.deleteById(productId);

}

回答1:

SOLVED, I don't know why, but in crudRepository method deleteById(productId) worked only with CascadeType.ALL and you delete all(product and category records) in the request /categories/{catId}/products/{productId} and this bad. I am usung just delete(Product product) and this delete product. In the case of {id} just do request project by id and got it, next delete.

来源：https://stackoverflow.com/questions/55323401/deleting-entity-in-spring-jpa

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