加入购物车扣除库存逻辑修改

src/main/java/com/chaozhanggui/system/cashierservice/dao/TbProductMapper.java

@@ -34,4 +34,6 @@ public interface TbProductMapper {
 
 
     void upGroupRealSalesNumber(@Param("id") String id,@Param("number") Integer number);
-}
+
+    void updateStockById(@Param("productId") String productId, @Param("num") Integer num);
+}