如何在包含一對多關系的類中執行刪除操作

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;
    
     }
    
    
    

當我試圖按 ID 刪除產品時，我收到了類似的錯誤

product ：無法刪除或更新父行：外鍵約束失敗（ mywebapp product_variation ，CONSTRAINT FKpryf02se86hpv5v7xn5afye4v ）（ product_id參考） id

我如何更正此錯誤並刪除產品，使其所有變體也被刪除。

Answer 1

您定義的產品 class 中的級聯操作會自動刪除產品的變體。 只需從字段“private Set productVariationSet”和字段“private Product product”中刪除@JsonIgnore。