implement Order.java

src/main/java/dev/dao/OrderDao.java

@@ -1,25 +1,67 @@
 package dev.dao;
 
+import dev.database.DatabaseConnection;
 import dev.model.Order;
 
+import java.sql.*;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
 import java.util.List;
 
 public class OrderDao {
 
     public int save(Order order) {
 
-        // TODO:
         // Insert order and return generated id
+        String sql = "INSERT INTO orders (user_id, total_price, created_at) VALUES(?, ?, ?) RETURNING id";
+
+        try (Connection connection = DatabaseConnection.getConnection();
+             PreparedStatement preparedStatement = connection.prepareStatement(sql)){
+
+            preparedStatement.setInt(1, order.getUserId());
+            preparedStatement.setDouble(2, order.getTotalPrice());
+            preparedStatement.setTimestamp(3, Timestamp.valueOf(LocalDateTime.now()));
+
+            ResultSet resultSet = preparedStatement.executeQuery();
+
+            if(resultSet.next()) return resultSet.getInt("id");
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
 
         return -1;
     }
 
     public List<Order> findByUserId(int userId) {
 
-        // TODO:
         // Retrieve all orders of a user
+        String sql = "SELECT * FROM orders WHERE user_id=?";
+        List<Order> orders = new ArrayList<>();
 
-        return null;
+        try(Connection connection = DatabaseConnection.getConnection();
+            PreparedStatement preparedStatement = connection.prepareStatement(sql) ) {
+
+            preparedStatement.setInt(1, userId);
+
+            ResultSet resultSet = preparedStatement.executeQuery();
+
+            while (resultSet.next()) {
+
+                Order order = new Order();
+
+                order.setId(resultSet.getInt("id"));
+                order.setUserId(resultSet.getInt("user_id"));
+                order.setCreatedAt(resultSet.getTimestamp("created_at").toLocalDateTime());
+                order.setTotalPrice(resultSet.getDouble("total_price"));
+
+                orders.add(order);
+            }
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return orders;
     }
 
 }