根据以下要求，使用MySQL编写一个餐馆管理系统，并使用JAVA或C语言给出合适的代码，然后给出其数据库及连接。要求：主要有前台、顾客、后厨三个方面；在前台部分，餐馆对外有一个相对稳定的菜单，上面有菜品的照片和价格，但是也会时不时增加、减少或者修改菜单；顾客可以点菜和用餐结束之后核实票据并付款；票据中有菜品及其价格的列表、下单时间、总费用等信息；后厨主要负责材料的维护，餐馆内部记录着菜单上每道菜需要消耗的材料量。收到顾客订单后，依据菜品准备材料。

以下是基于MySQL的餐馆管理系统的数据库设计：

1. 菜品表（menu）
- id：菜品ID
- name：菜品名称
- price：菜品价格
- image：菜品图片
- status：菜品状态（上架/下架）

2. 材料表（material）
- id：材料ID
- name：材料名称
- quantity：材料数量

3. 菜品-材料关联表（menu_material）
- menu_id：菜品ID
- material_id：材料ID
- quantity：材料数量

4. 订单表（order）
- id：订单ID
- create_time：下单时间
- total_price：总价
- status：订单状态（未付款/已付款）
- customer_id：顾客ID

5. 订单-菜品关联表（order_menu）
- order_id：订单ID
- menu_id：菜品ID
- quantity：菜品数量

6. 顾客表（customer）
- id：顾客ID
- name：顾客姓名
- phone：顾客电话

7. 厨房表（kitchen）
- id：厨房ID
- name：厨房名称

8. 厨房-菜品关联表（kitchen_menu）
- kitchen_id：厨房ID
- menu_id：菜品ID

以下是Java语言的代码示例：

1. 菜品类（Menu）

public class Menu {
    private int id;
    private String name;
    private double price;
    private String image;
    private boolean status;

    // getter and setter methods
}

2. 材料类（Material）

public class Material {
    private int id;
    private String name;
    private int quantity;

    // getter and setter methods
}

3. 订单类（Order）

public class Order {
    private int id;
    private Date createTime;
    private double totalPrice;
    private boolean status;
    private int customerId;
    private List<Menu> menus;

    // getter and setter methods
}

4. 顾客类（Customer）

public class Customer {
    private int id;
    private String name;
    private String phone;

    // getter and setter methods
}

5. 厨房类（Kitchen）

public class Kitchen {
    private int id;
    private String name;
    private List<Menu> menus;

    // getter and setter methods
}

6. 数据库连接类（DBConnection）

public class DBConnection {
    private static final String URL = "jdbc:mysql://localhost:3306/restaurant";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "password";

    public static Connection getConnection() {
        Connection connection = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }

        return connection;
    }
}

7. 数据库操作类（DBOperation）

public class DBOperation {
    public static List<Menu> getMenuList() {
        List<Menu> menuList = new ArrayList<>();

        try (Connection connection = DBConnection.getConnection()) {
            String sql = "SELECT * FROM menu WHERE status = 1";
            PreparedStatement statement = connection.prepareStatement(sql);
            ResultSet resultSet = statement.executeQuery();

            while (resultSet.next()) {
                Menu menu = new Menu();
                menu.setId(resultSet.getInt("id"));
                menu.setName(resultSet.getString("name"));
                menu.setPrice(resultSet.getDouble("price"));
                menu.setImage(resultSet.getString("image"));
                menu.setStatus(resultSet.getBoolean("status"));
                menuList.add(menu);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return menuList;
    }

    public static List<Material> getMaterialList() {
        List<Material> materialList = new ArrayList<>();

        try (Connection connection = DBConnection.getConnection()) {
            String sql = "SELECT * FROM material";
            PreparedStatement statement = connection.prepareStatement(sql);
            ResultSet resultSet = statement.executeQuery();

            while (resultSet.next()) {
                Material material = new Material();
                material.setId(resultSet.getInt("id"));
                material.setName(resultSet.getString("name"));
                material.setQuantity(resultSet.getInt("quantity"));
                materialList.add(material);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return materialList;
    }

    public static boolean placeOrder(Order order) {
        boolean success = false;

        try (Connection connection = DBConnection.getConnection()) {
            connection.setAutoCommit(false);

            String sql1 = "INSERT INTO `order` (create_time, total_price, status, customer_id) VALUES (?, ?, ?, ?)";
            PreparedStatement statement1 = connection.prepareStatement(sql1, Statement.RETURN_GENERATED_KEYS);
            statement1.setTimestamp(1, new Timestamp(order.getCreateTime().getTime()));
            statement1.setDouble(2, order.getTotalPrice());
            statement1.setBoolean(3, order.isStatus());
            statement1.setInt(4, order.getCustomerId());
            statement1.executeUpdate();

            ResultSet resultSet = statement1.getGeneratedKeys();
            if (resultSet.next()) {
                int orderId = resultSet.getInt(1);

                String sql2 = "INSERT INTO order_menu (order_id, menu_id, quantity) VALUES (?, ?, ?)";
                PreparedStatement statement2 = connection.prepareStatement(sql2);
                for (Menu menu : order.getMenus()) {
                    statement2.setInt(1, orderId);
                    statement2.setInt(2, menu.getId());
                    statement2.setInt(3, 1);
                    statement2.addBatch();
                }
                statement2.executeBatch();

                success = true;
            }

            if (success) {
                connection.commit();
            } else {
                connection.rollback();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return success;
    }
}