complete DAO (and model) package

src/main/java/dev/dao/OrderDetailDao.java

@@ -1,24 +1,73 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.OrderDetail;
 
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.List;
 
 public class OrderDetailDao {
 
     public void save(OrderDetail detail) {
 
-        // TODO:
-        // Insert order detail
+        String sql = "INSERT INTO order_details (order_id, menu_items_id, quantity, price_at_purchase) VALUES (?,?,?,?)";
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql))
+        {
+            stmt.setInt(2, detail.getOrderId());
+            stmt.setInt(3, detail.getMenuItemId());
+            stmt.setInt(4, detail.getQuantity());
+            stmt.setDouble(5, detail.getPrice());
+
+            int affectedRows = stmt.executeUpdate();
+            if (affectedRows == 0)
+            {
+                throw new SQLException("unsuccessful");
+            }
+
+
+        } catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
 
     }
 
     public List<OrderDetail> findByOrderId(int orderId) {
 
-        // TODO:
-        // Retrieve order details
+        String sql = "SELECT id, order_id, menu_items_id, quantity, price_at_purchase FROM order_details WHERE order_id = ?";
 
-        return null;
+        List<OrderDetail> orderDetails = new ArrayList<>();
+        try (Connection conn = DatabaseConnection.getConnection();
+             PreparedStatement stmt = conn.prepareStatement(sql))
+        {
+
+            stmt.setInt(1, orderId);
+            try (ResultSet rs = stmt.executeQuery())
+            {
+                while (rs.next())
+                {
+                    OrderDetail orderDetail = new OrderDetail();
+                    orderDetail.setId(rs.getInt("id"));
+                    orderDetail.setOrderId(rs.getInt("order_id"));
+                    orderDetail.setMenuItemId(rs.getInt("menu_item_id"));
+                    orderDetail.setQuantity(rs.getInt("quantity"));
+                    orderDetail.setPrice(rs.getDouble("price_at_purchase"));
+
+                    orderDetails.add(orderDetail);
+                }
+            }
+
+        } catch (SQLException e)
+        {
+            e.printStackTrace();
+        }
+
+        return orderDetails;
     }
 
 }