如何在同一个类中创建一对一映射和一对多

如何解决如何在同一个类中创建一对一映射和一对多

我正在创建一个在线购物网站。它有三个简单的表，分别是cart、cartItem 和shipping details。我使用 spring boot 和 MysqL 来开发这个。我以某种方式设法在 Cart 和 CartItem 之间进行一对多映射。这行得通。我可以保存数据，也可以从数据库中获取数据。但是当我添加运输详细信息时它不起作用

那些是我创建的表

     create table cart (
       id bigint not null auto_increment,cart_date date,fk_cus_id integer not null,item_count integer not null,total_price double precision not null,primary key (id)
    ) engine=InnoDB

    
    create table cart_item (
       id bigint not null auto_increment,paid bit not null,product_id integer not null,product_name varchar(255),qty integer not null,seller_id integer not null,status integer not null,cart_cart_id bigint,primary key (id)
    ) engine=InnoDB



   create table shipping (
       id bigint not null auto_increment,address_line_one varchar(255),city_code integer not null,district_code integer not null,f_name varchar(255),l_name varchar(255),province_code integer not null,primary key (id)
    ) engine=InnoDB

    
    alter table cart_item 
       add constraint FK7vsju2wftw7285wp7maxhi2pd 
       foreign key (cart_cart_id) 
       references cart (id)

    
    alter table shipping 
       add constraint FKdvyy28kroew5djqmb6739f89w 
       foreign key (cart_cart_id) 
       references cart (id)

那些是我创建的模型类

  @Entity
    public class CartItem {
    
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;
        private int productId;
        private int  sellerId ;
        private String productName;
        private int qty;
        private double totalPrice;
        private int status;
        private boolean paid;
    
        @ManyToOne(fetch = FetchType.LAZY)
        @JsonIgnore
        private Cart cart;
    
        public Long getId() {
            return id;
        }
    
        public void setId(Long id) {
            this.id = id;
        }
    
        public int getProductId() {
            return productId;
        }
    
        public void setProductId(int productId) {
            this.productId = productId;
        }
    
        public int getSellerId() {
            return sellerId;
        }
    
        public void setSellerId(int sellerId) {
            this.sellerId = sellerId;
        }
    
        public String getProductName() {
            return productName;
        }
    
        public void setProductName(String productName) {
            this.productName = productName;
        }
    
        public int getQty() {
            return qty;
        }
    
        public void setQty(int qty) {
            this.qty = qty;
        }
    
        public double getTotalPrice() {
            return totalPrice;
        }
    
        public void setTotalPrice(double totalPrice) {
            this.totalPrice = totalPrice;
        }
    
        public Cart getCart() {
            return cart;
        }
    
        public void setCart(Cart cart) {
            this.cart = cart;
        }
    
        public int getStatus() {
            return status;
        }
    
        public void setStatus(int status) {
            this.status = status;
        }
    
        public boolean isPaid() {
            return paid;
        }
    
        public void setPaid(boolean paid) {
            this.paid = paid;
        }
    }
@Entity
public class Cart implements Serializable {

    private static final long serialVersionUID = 8155938349165825920L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private double totalPrice;
    private int fkCusId;
    private Date cartDate;
    private int itemCount ;

    @OnetoMany(mappedBy = "cart",cascade = CascadeType.ALL,orphanRemoval = true)
    private List<CartItem> cartItems;

   /* @OnetoOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "cart_cart_id",referencedColumnName = "id")*/

    @OnetoOne(mappedBy = "cart",cascade = CascadeType.ALL)
    @PrimaryKeyJoinColumn
    private Shipping shippingDetails;

    public void setCart(CartItem cartItem) {

        cartItem.setCart(this);
        shippingDetails.setCart(this);

    }

    public Shipping getShippingDetails() {
        return shippingDetails;
    }

    public void setShippingDetails(Shipping shippingDetails) {
        this.shippingDetails = shippingDetails;
    }

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public double getTotalPrice() {
        return totalPrice;
    }

    public void setTotalPrice(double totalPrice) {
        this.totalPrice = totalPrice;
    }

    public int getFkCusId() {
        return fkCusId;
    }

    public void setFkCusId(int fkCusId) {
        this.fkCusId = fkCusId;
    }

    public Date getCartDate() {
        return cartDate;
    }

    public void setCartDate(Date cartDate) {
        this.cartDate = cartDate;
    }

    public int getItemCount() {
        return itemCount;
    }

    public void setItemCount(int itemCount) {
        this.itemCount = itemCount;
    }

    public List<CartItem> getCartItems() {
        return cartItems;
    }

    public void setCartItems(List<CartItem> cartItems) {
        this.cartItems = cartItems;
    }
}

@Entity
public class Shipping {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private int fkCusId;
    private String fName;
    private String lName;
    private String addressLineOne;
    private int cityCode;
    private int provinceCode;
    private int districtCode;

    @OnetoOne
    @MapsId
    @JoinColumn(name = "id")
    private Cart cart;

    public Cart getCart() {
        return cart;
    }

    public void setCart(Cart cart) {
        this.cart = cart;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public int getFkCusId() {
        return fkCusId;
    }

    public void setFkCusId(int fkCusId) {
        this.fkCusId = fkCusId;
    }

    public String getfName() {
        return fName;
    }

    public void setfName(String fName) {
        this.fName = fName;
    }

    public String getlName() {
        return lName;
    }

    public void setlName(String lName) {
        this.lName = lName;
    }

    public String getAddressLineOne() {
        return addressLineOne;
    }

    public void setAddressLineOne(String addressLineOne) {
        this.addressLineOne = addressLineOne;
    }

    public int getCityCode() {
        return cityCode;
    }

    public void setCityCode(int cityCode) {
        this.cityCode = cityCode;
    }

    public int getProvinceCode() {
        return provinceCode;
    }

    public void setProvinceCode(int provinceCode) {
        this.provinceCode = provinceCode;
    }

    public int getdistrictCode() {
        return districtCode;
    }

    public void setdistrictCode(int districtCode) {
        this.districtCode = districtCode;
    }
}

这是服务类。所有存储库都使用 crudRepository 扩展

@Service
public class CartService {

    @Autowired
    CartItemRepository cartItemRepository;

    @Autowired
    Cartrepository cartrepository;

    @Autowired
    ShippingRepository shippingRepository;


       public Cart addProductToCart(Cart cart){

        cart.getCartItems().forEach(item -> cart.setCart(item));
        return cartrepository.save(cart);


    }
}

这是 JSON 负载

{
    
     "totalPrice":152500,"fkCusId":1,"cartDate":"2020-12-03","itemCount":1,"cartItems":[{
      
        "productId":1,"sellerId":1,"productName":"acer lap","qty":1,"totalPrice":152500

     }],"shippingDetails":{
         "fkCusId":2,"fName":"Joe","lName":"Bidan","addressLineOne":"testing","cityCode":1,"provinceCode":1,"districtCode":1
   
     }
    
}

系统运行良好，无需运输详细信息。当我将运输详细信息作为属性添加到购物车时一对一映射，不起作用。有人可以给我一个代码示例，说明如何将运输详细信息添加到购物车并正确映射