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implement dao classes

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This commit is contained in:
mohammadreza
2026-06-27 01:43:42 +03:30
parent 2e5b7bee05
commit e5b396605e
4 changed files with 200 additions and 20 deletions
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src/main/java/dev/dao/MenuItemDao.java
+54 -5
View File
@@ -1,24 +1,73 @@
package dev.dao;
import dev.database.DatabaseConnection;
import dev.model.MenuItem;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class MenuItemDao {
public List<MenuItem> findAll() {
// TODO:
// Retrieve all menu items
String sql = "SELECT * FROM menu_items";
List<MenuItem> items = new ArrayList<>();
return null;
try (PreparedStatement ps = DatabaseConnection
.getConnection()
.prepareStatement(sql))
{
ResultSet rs = ps.executeQuery();
while (rs.next())
{
MenuItem menuItem = new MenuItem();
menuItem.setId(rs.getInt("id"));
menuItem.setName(rs.getString("name"));
menuItem.setDescription(rs.getString("description"));
menuItem.setPrice(rs.getDouble("price"));
menuItem.setCategory(rs.getString("category"));
items.add(menuItem);
}
} catch (SQLException e) {
System.out.println(e.getStackTrace());
}
return items;
}
public MenuItem findById(int id) {
// TODO:
// Find menu item by id
String sql = "SELECT * FROM menu_items WHERE id=?";
try(PreparedStatement ps = DatabaseConnection
.getConnection()
.prepareStatement(sql))
{
ps.setInt(1,id);
ResultSet rs = ps.executeQuery();
if(rs.next())
{
MenuItem item = new MenuItem();
item.setId(rs.getInt("id"));
item.setName(rs.getString("name"));
item.setDescription(rs.getString("description"));
item.setPrice(rs.getDouble("price"));
item.setCategory(rs.getString("category"));
return item;
}
}
catch (SQLException e)
{
e.printStackTrace();
}
return null;
}
src/main/java/dev/dao/OrderDao.java
+55 -5
View File
@@ -1,25 +1,75 @@
package dev.dao;
import dev.database.DatabaseConnection;
import dev.model.Order;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;
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 user_orders(user_id, created_at, total_price) VALUES(?,?,?)";
try (PreparedStatement ps = DatabaseConnection
.getConnection()
.prepareStatement(sql, PreparedStatement.RETURN_GENERATED_KEYS))
{
ps.setInt(1, order.getUserId());
ps.setTimestamp(2, Timestamp.valueOf(order.getCreatedAt()));
ps.setDouble(3, order.getTotalPrice());
ps.executeUpdate();
ResultSet rs = ps.getGeneratedKeys();
if(rs.next()) return rs.getInt(1);
} catch (SQLException e) {
e.printStackTrace();
}
return -1;
}
public List<Order> findByUserId(int userId) {
// TODO:
// Retrieve all orders of a user
List<Order> orders = new ArrayList<>();
String sql = "SELECT * FROM user_orders WHERE user_id=?";
return null;
try(PreparedStatement ps = DatabaseConnection
.getConnection()
.prepareStatement(sql))
{
ps.setInt(1,userId);
ResultSet rs = ps.executeQuery();
while(rs.next())
{
Order order = new Order();
order.setId(rs.getInt("id"));
order.setUserId(rs.getInt("user_id"));
order.setTotalPrice(rs.getDouble("total_price"));
order.setCreatedAt(rs.getTimestamp("created_at").toLocalDateTime());
orders.add(order);
}
}
catch (SQLException e)
{
e.printStackTrace();
}
return orders;
}
}
src/main/java/dev/dao/OrderDetailDao.java
+51 -5
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@@ -1,24 +1,70 @@
package dev.dao;
import dev.database.DatabaseConnection;
import dev.model.OrderDetail;
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_id, quantity, item_price) VALUES (?,?,?,?)";
try (PreparedStatement ps = DatabaseConnection
.getConnection()
.prepareStatement(sql))
{
ps.setInt(1,detail.getOrderId());
ps.setInt(2,detail.getMenuItemId());
ps.setInt(3,detail.getQuantity());
ps.setDouble(4,detail.getPrice());
ps.executeUpdate();
} catch (SQLException e) {
System.out.println(e.getStackTrace());
}
}
public List<OrderDetail> findByOrderId(int orderId) {
// TODO:
// Retrieve order details
String sql = "SELECT * FROM order_details WHERE order_id=?";
return null;
List<OrderDetail> details = new ArrayList<>();
try (PreparedStatement ps = DatabaseConnection
.getConnection()
.prepareStatement(sql))
{
ps.setInt(1,orderId);
ResultSet rs = ps.executeQuery();
while(rs.next())
{
OrderDetail detail = new OrderDetail();
detail.setOrderId(rs.getInt("order_id"));
detail.setMenuItemId(rs.getInt("menu_id"));
detail.setPrice(rs.getDouble("item_price"));
detail.setQuantity(rs.getInt("quantity"));
details.add(detail);
}
} catch (SQLException e) {
System.out.println(e.getStackTrace());
}
return details;
}
}
src/main/java/dev/dao/UserDao.java
+40 -5
View File
@@ -1,23 +1,58 @@
package dev.dao;
import dev.database.DatabaseConnection;
import dev.model.User;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao {
public boolean save(User user) {
// TODO:
// Insert user into database
String sql = "INSERT INTO users (username, password_hash, email) VALUES (?, ?, ?)";
try {
PreparedStatement ps = DatabaseConnection.getConnection().prepareStatement(sql);
ps.setString(1, user.getUsername());
ps.setString(2, user.getPasswordHash());
ps.setString(3, user.getEmail());
ps.executeUpdate();
return true;
} catch (SQLException e) {
System.out.println("fail to save user: " + e.getMessage());
}
return false;
}
public User findByUsername(String username) {
// TODO:
// Find a user by username
String sql = "SELECT * FROM users WHERE username=?";
return null;
User result = null;
try {
PreparedStatement stmt = DatabaseConnection.getConnection().prepareStatement(sql);
stmt.setString(1, username);
ResultSet rs = stmt.executeQuery();
if (rs.next()){
result = new User(
rs.getInt("id"),
rs.getString("username"),
rs.getString("password_hash"),
rs.getString("email")
);
}
} catch (SQLException e) {
System.err.println("Unable to find user: " + e.getMessage());
}
return result;
}
}