如何在包含一对多关系的类中执行删除操作

Question

This is my product Entity
   
 @Entity
    public class Product {
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private int id;
    
        @NotNull
        private String name;
    
        private String cancellable;
        private String returnable;
        @NotNull
        private String brand;
        private boolean active;
        @JsonIgnore
        @OneToMany(mappedBy = "product",cascade = CascadeType.ALL)
        private Set<ProductVariation> productVariationSet;
    }

    
This is Product Variant Entity

    @Entity
    public class ProductVariation {
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private int id;
    
        private String ProductName;
    
        @NotNull
        private int quantityavailable;
        @NotNull
        private int price;
    
    
        private String details;
   
    
        @JsonIgnore
        @ManyToOne
        @JoinColumn(name = "product_id")
        private Product product;
    
     }
    
    
    

当我试图按 ID 删除产品时，我收到了类似的错误

product ：无法删除或更新父行：外键约束失败（ mywebapp product_variation ，CONSTRAINT FKpryf02se86hpv5v7xn5afye4v ）（ product_id参考） id

我如何更正此错误并删除产品，使其所有变体也被删除。

Answer 1

您定义的产品 class 中的级联操作会自动删除产品的变体。 只需从字段“private Set productVariationSet”和字段“private Product product”中删除@JsonIgnore。