Save the order to database - Backend

src/main/java/com/luv2code/ecommerce/controller/CheckoutController.java

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+package com.luv2code.ecommerce.controller;
+
+import com.luv2code.ecommerce.dto.Purchase;
+import com.luv2code.ecommerce.dto.PurchaseResponse;
+import com.luv2code.ecommerce.service.CheckoutService;
+import org.springframework.web.bind.annotation.*;
+
+@CrossOrigin("http://localhost:4200")
+@RestController
+@RequestMapping("/api/checkout")
+public class CheckoutController {
+
+    private CheckoutService checkoutService;
+
+    public CheckoutController(CheckoutService checkoutService){
+        this.checkoutService = checkoutService;
+    }
+
+    @PostMapping("/purchase")
+    public PurchaseResponse placeOrder(@RequestBody Purchase purchase) {
+        PurchaseResponse purchaseResponse = checkoutService.placeOrder(purchase);
+
+        return purchaseResponse;
+    }
+}

src/main/java/com/luv2code/ecommerce/dao/CustomerRepository.java

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+package com.luv2code.ecommerce.dao;
+
+import com.luv2code.ecommerce.entity.Customer;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CustomerRepository extends JpaRepository<Customer, Long> {
+}

src/main/java/com/luv2code/ecommerce/dto/Purchase.java

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+package com.luv2code.ecommerce.dto;
+
+import com.luv2code.ecommerce.entity.Address;
+import com.luv2code.ecommerce.entity.Customer;
+import com.luv2code.ecommerce.entity.Order;
+import com.luv2code.ecommerce.entity.OrderItem;
+import lombok.Data;
+
+import java.util.Set;
+
+@Data
+public class Purchase {
+
+    private Customer customer;
+    private Address shippingAddress;
+    private Address billingAddress;
+    private Order order;
+    private Set<OrderItem> orderItems;
+}

src/main/java/com/luv2code/ecommerce/dto/PurchaseResponse.java

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+package com.luv2code.ecommerce.dto;
+
+import lombok.Data;
+
+@Data
+public class PurchaseResponse {
+
+    private final String orderTrackingNumber;
+}

src/main/java/com/luv2code/ecommerce/entity/Address.java

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+package com.luv2code.ecommerce.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+@Entity
+@Table(name = "address")
+@Getter
+@Setter
+public class Address {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    private Long id;
+
+    @Column(name = "street")
+    private String street;
+
+    @Column(name = "city")
+    private String city;
+
+    @Column(name = "state")
+    private String state;
+
+    @Column(name = "country")
+    private String country;
+
+    @Column(name = "zip_code")
+    private String zipCode;
+
+    @OneToOne
+    @PrimaryKeyJoinColumn
+    private Order order;
+}

src/main/java/com/luv2code/ecommerce/entity/Customer.java

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+package com.luv2code.ecommerce.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+@Table(name = "customer")
+@Getter
+@Setter
+public class Customer {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    private Long id;
+
+    @Column(name = "first_name")
+    private String firstName;
+
+    @Column(name = "last_name")
+    private String lastName;
+
+    @Column(name = "email")
+    private String email;
+
+    @OneToMany(mappedBy = "customer", cascade = CascadeType.ALL)
+    private Set<Order> orders = new HashSet<>();
+
+    public void add(Order order){
+        if(order != null) {
+            if(orders == null){
+                orders = new HashSet<>();
+            }
+
+            orders.add(order);
+            order.setCustomer(this);
+        }
+    }
+
+}

src/main/java/com/luv2code/ecommerce/entity/Order.java

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+package com.luv2code.ecommerce.entity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+
+import java.math.BigDecimal;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+@Table(name="orders")
+@Getter
+@Setter
+public class Order {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name="id")
+    private Long id;
+
+    @Column(name="order_tracking_number")
+    private String orderTrackingNumber;
+
+    @Column(name="total_quantity")
+    private int totalQuantity;
+
+    @Column(name="total_price")
+    private BigDecimal totalPrice;
+
+    @Column(name="status")
+    private String status;
+
+    @Column(name="date_created")
+    @CreationTimestamp
+    private Date dateCreated;
+
+    @Column(name="last_updated")
+    @UpdateTimestamp
+    private Date lastUpdated;
+
+    @OneToMany(cascade = CascadeType.ALL, mappedBy = "order")
+    private Set<OrderItem> orderItems = new HashSet<>();
+
+    @ManyToOne
+    @JoinColumn(name = "customer_id")
+    private Customer customer;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "shipping_address_id", referencedColumnName = "id")
+    private Address shippingAddress;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "billing_address_id", referencedColumnName = "id")
+    private Address billingAddress;
+
+    public void add(OrderItem item) {
+
+        if (item != null) {
+            if (orderItems == null) {
+                orderItems = new HashSet<>();
+            }
+
+            orderItems.add(item);
+            item.setOrder(this);
+        }
+    }
+}
+
+
+
+
+
+
+
+

src/main/java/com/luv2code/ecommerce/entity/OrderItem.java

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+package com.luv2code.ecommerce.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.math.BigDecimal;
+
+@Entity
+@Table(name="order_item")
+@Getter
+@Setter
+public class OrderItem {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name="id")
+    private Long id;
+
+    @Column(name="image_url")
+    private String imageUrl;
+
+    @Column(name="unit_price")
+    private BigDecimal unitPrice;
+
+    @Column(name="quantity")
+    private int quantity;
+
+    @Column(name="product_id")
+    private Long productId;
+
+    @ManyToOne
+    @JoinColumn(name = "order_id")
+    private Order order;
+
+}
+
+
+
+
+
+
+

src/main/java/com/luv2code/ecommerce/service/CheckoutService.java

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+package com.luv2code.ecommerce.service;
+
+import com.luv2code.ecommerce.dto.Purchase;
+import com.luv2code.ecommerce.dto.PurchaseResponse;
+
+public interface CheckoutService {
+
+    PurchaseResponse placeOrder(Purchase purchase);
+}

src/main/java/com/luv2code/ecommerce/service/CheckoutServiceImpl.java

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+package com.luv2code.ecommerce.service;
+
+import com.luv2code.ecommerce.dao.CustomerRepository;
+import com.luv2code.ecommerce.dto.Purchase;
+import com.luv2code.ecommerce.dto.PurchaseResponse;
+import com.luv2code.ecommerce.entity.Customer;
+import com.luv2code.ecommerce.entity.Order;
+import com.luv2code.ecommerce.entity.OrderItem;
+import jakarta.transaction.Transactional;
+import org.springframework.stereotype.Service;
+
+import java.util.Set;
+import java.util.UUID;
+
+@Service
+public class CheckoutServiceImpl implements CheckoutService{
+
+    private CustomerRepository customerRepository;
+
+    public CheckoutServiceImpl(CustomerRepository customerRepository){
+        this.customerRepository = customerRepository;
+    }
+
+    @Override
+    @Transactional
+    public PurchaseResponse placeOrder(Purchase purchase) {
+
+        //Retrieve the order info from dto
+        Order order = purchase.getOrder();
+
+        //Generate tracking number
+        String orderTrackingNumber = generateOrderTrackingNumber();
+        order.setOrderTrackingNumber(orderTrackingNumber);
+
+        //Populate order with orderItems
+        Set<OrderItem> orderItems = purchase.getOrderItems();
+        orderItems.forEach(item -> order.add(item));
+
+        //Populate order with billingAddress and shippingAddress
+        order.setBillingAddress(purchase.getBillingAddress());
+        order.setShippingAddress(purchase.getShippingAddress());
+
+        //Populate customer with order
+        Customer customer = purchase.getCustomer();
+        customer.add(order);
+
+        //Save to the database
+        customerRepository.save(customer);
+
+        //return a response
+        return new PurchaseResponse(orderTrackingNumber);
+    }
+
+    private String generateOrderTrackingNumber() {
+        //Generate a random UUID number (UUID version - 4)
+        return UUID.randomUUID().toString();
+    }
+}