请分享您的想法

Question

我已经实现了购物车到产品。但不知道如何为每个用户实施单独的购物车。

请分享您的想法

Answer 1

请始终与您的问题分享您的努力/代码。

根据我的说法，这可以用于许多场景

其中一个场景就像，

用户有一个购物车，购物车将有许多产品，许多产品属于许多购物车

代码如下所示，您可以继续向实体添加所需的参数。

用户实体

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name = "USERS")
public class User {

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

    @Column(name = "USER_NAME")
    private String userName;

    @OneToOne(mappedBy = "user", fetch = FetchType.LAZY)
    private Cart cart;

    public Long getId() {
        return id;
    }

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

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Cart getCart() {
        return cart;
    }

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

}

购物车实体

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name = "CART")
public class Cart {

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

    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "USER_ID")
    private User user;

    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinTable(name = "CART_PRODUCT", joinColumns = @JoinColumn(name = "CART_ID") , inverseJoinColumns = @JoinColumn(name = "PRODUCT_ID") )
    private Set<Product> products;

    public Long getId() {
        return id;
    }

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

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public Set<Product> getProducts() {
        return products;
    }

    public void setProducts(Set<Product> products) {
        this.products = products;
    }

}

产品实体

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name = "PRODUCT")
public class Product {

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

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

    @ManyToMany(cascade = CascadeType.ALL, mappedBy = "products")
    private Set<Cart> carts;

    public Long getId() {
        return id;
    }

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

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public Set<Cart> getCarts() {
        return carts;
    }

    public void setCarts(Set<Cart> carts) {
        this.carts = carts;
    }

}

导致使用Spring在购物车中实现购物车

请分享您的想法

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