苍穹外卖--删除一条购物车

sky-server/src/main/java/com/sky/service/ShoppingCartService.java

@@ -20,4 +20,7 @@ public interface ShoppingCartService {
     清空购物车
      */
     void cleanShoppingCart();
+
+    void subShoppingCart(ShoppingCartDTO shoppingCartDTO);
+
 }

sky-server/src/main/java/com/sky/service/impl/ShoppingCartServiceImpl.java

@@ -113,4 +113,25 @@ public class ShoppingCartServiceImpl implements ShoppingCartService {
 
         shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
     }
+
+    /*
+    删除购物车中一个商品
+     */
+    @Override
+    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
+        ShoppingCart cart = new ShoppingCart();
+        BeanUtils.copyProperties(shoppingCartDTO,cart);
+        cart.setUserId(BaseContext.getCurrentId());
+        List<ShoppingCart> cartList = shoppingCartMapper.list(cart);
+        if (cartList != null && cartList.size() > 0) {
+            cart = cartList.get(0);
+
+            if (cart.getNumber() > 1) {
+                cart.setNumber(cart.getNumber() - 1);
+                shoppingCartMapper.updateNumberById(cart);
+            } else {
+                shoppingCartMapper.deleteById(cart.getId());
+            }
+        }
+    }
 }