Implement database, daos and other classes

database.sql

@@ -1,141 +1,81 @@
--- Restaurant Database Management System
---
--- Instructions:
--- 1. Create all required tables.
--- 2. Design appropriate PRIMARY KEY and FOREIGN KEY relationships.
--- 3. Add suitable constraints based on the requirements.
--- 4. Insert initial mock data.
--- 5. Insert at least 3 menu items.
--- 6. The script should be executable from start to finish without errors.
-
-
-
 -- =======================================================
 -- USER TABLE
 -- =======================================================
---
--- Represents customers using the system.
---
--- Required information:
--- - Unique identifier
--- - Username
--- - Password
--- - Email (optional)
---
--- Requirements:
--- - Each user must have a unique identifier.
--- - Usernames must be unique.
--- - Username and password are required.
--- - Passwords should not be stored in plain text.
---
--- CREATE TABLE ...
-
+CREATE TABLE users(
+    id              SERIAL          PRIMARY KEY,
+    username        VARCHAR(50)     UNIQUE NOT NULL,
+    password_hash   TEXT            NOT NULL,
+    email           VARCHAR(255)    UNIQUE
+);
 
 
 -- =======================================================
 -- MENU ITEM TABLE
 -- =======================================================
---
--- Represents available food and drink items.
---
--- Required information:
--- - Unique identifier
--- - Name
--- - Description (optional)
--- - Price
--- - Category (optional)
---
--- Requirements:
--- - Each menu item must have a unique identifier.
--- - Name is required.
--- - Price must always be positive.
---
--- CREATE TABLE ...
-
+CREATE TABLE menu(
+    id              SERIAL          PRIMARY KEY,
+    name            VARCHAR(250)    NOT NULL,
+    description     TEXT,
+    price           NUMERIC         NOT NULL CHECK (price > 0),
+    category        VARCHAR(50)
+);
 
 
 -- =======================================================
 -- ORDER TABLE
 -- =======================================================
---
--- Represents orders placed by customers.
---
--- Required information:
--- - Unique identifier
--- - Reference to customer
--- - Creation date and time
--- - Total price
---
--- Requirements:
--- - Each order must belong to exactly one user.
--- - A user can have multiple orders.
--- - The relationship between User and Order must be implemented.
---
--- Note:
--- Avoid using reserved SQL keywords as table names.
--- Consider using a name such as "orders" or "customer_orders".
---
--- CREATE TABLE ...
+CREATE TABLE orders(
+    id          SERIAL      PRIMARY KEY,
+    user_id     INT         NOT NULL,
+    created_at  TIMESTAMP   NOT NULL ,
+    total_price NUMERIC     NOT NULL,
 
+    FOREIGN KEY (user_id) REFERENCES users(id)
+);
 
 
 -- =======================================================
 -- ORDER DETAIL TABLE
 -- =======================================================
---
--- Represents items inside an order.
---
--- Required information:
--- - Unique identifier
--- - Reference to an order
--- - Reference to a menu item
--- - Quantity
--- - Item price at purchase time
---
--- Requirements:
--- - Each detail record must belong to one order.
--- - Each detail record must reference one menu item.
--- - Quantity must always be greater than zero.
--- - Store the item's price at the moment of purchase.
---
--- CREATE TABLE ...
+CREATE TABLE order_details(
+    id          SERIAL  PRIMARY KEY ,
+    order_id    INT     NOT NULL ,
+    menu_id     INT     NOT NULL ,
+    quantity    NUMERIC NOT NULL        CHECK (quantity > 0),
+    item_price  NUMERIC NOT NULL,
 
+    FOREIGN KEY (order_id) REFERENCES orders(id),
+    FOREIGN KEY (menu_id) REFERENCES menu(id)
+);
 
 
 -- =======================================================
 -- INITIAL MENU DATA
 -- =======================================================
---
--- Insert at least 3 food or drink items.
---
--- Example categories:
--- - Pizza
--- - Burger
--- - Pasta
--- - Drink
---
--- INSERT INTO ...
-
+-- id is left out because it has SERIAl type and auto-generates.
+INSERT INTO menu (name, description, price, category) VALUES
+    ('Margherita Pizza',      'Classic tomato, mozzarella, and basil',        9.99,  'Pizza'),
+    ('Grilled Chicken Wrap',  'Chicken, lettuce, tomato, garlic sauce',       7.49,  'Wraps'),
+    ('Caesar Salad',          'Romaine, parmesan, croutons, caesar dressing', 6.99,  'Salads'),
+    ('Beef Burger',           'Beef patty, cheddar, lettuce, brioche bun',    8.99,  'Burgers'),
+    ('Spaghetti Carbonara',   'Pasta, egg, pancetta, parmesan',              10.49,  'Pasta'),
+    ('Veggie Spring Rolls',   'Crispy rolls with mixed vegetables',           5.49,  'Appetizers'),
+    ('Chocolate Lava Cake',   'Warm cake with molten chocolate center',       4.99,  'Dessert'),
+    ('Iced Latte',            'Espresso with cold milk over ice',             3.49,  'Beverages'),
+    ('Mushroom Risotto',      'Creamy arborio rice with wild mushrooms',      9.49,  'Pasta'),
+    ('Fish Tacos',            'Grilled fish, cabbage slaw, chipotle mayo',    8.49,  'Tacos');
 
 
 -- =======================================================
 -- OPTIONAL TEST DATA
 -- =======================================================
---
--- You may insert sample users and orders for testing.
--- This section is optional.
---
--- INSERT INTO ...
 
 
 
 -- =======================================================
 -- VERIFICATION QUERIES
 -- =======================================================
---
--- Uncomment these queries to verify your database.
---
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
+-- SELECT * FROM users;
+-- SELECT * FROM menu;
+-- SELECT * FROM orders;
+-- SELECT * FROM order_details;