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complete Restaurant Management System with PostgreSQL and JDBC

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navid299
2026-07-06 16:39:32 +03:30
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database.sql
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-- 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.
CREATE TABLE users (
id SERIAL PRIMARY KEY,
username VARCHAR(50) UNIQUE NOT NULL,
password VARCHAR(255) NOT NULL, -- هش شده با SHA-256 + Base64
email VARCHAR(100)
);
CREATE TABLE menu_items (
id SERIAL PRIMARY KEY,
name VARCHAR(100) NOT NULL,
description TEXT,
price DECIMAL(10,2) NOT NULL CHECK (price > 0),
category VARCHAR(50)
);
CREATE TABLE orders (
id SERIAL PRIMARY KEY,
user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
total_price DECIMAL(10,2) NOT NULL CHECK (total_price >= 0)
);
CREATE TABLE order_details (
id SERIAL PRIMARY KEY,
order_id INTEGER NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
menu_item_id INTEGER NOT NULL REFERENCES menu_items(id),
quantity INTEGER NOT NULL CHECK (quantity > 0),
price DECIMAL(10,2) NOT NULL CHECK (price >= 0) -- قیمت در زمان خرید
);
INSERT INTO menu_items (name, description, price, category) VALUES
('Pizza', 'Classic Margherita with mozzarella and basil', 10.00, 'Main'),
('Burger', 'Juicy beef burger with lettuce and cheese', 8.00, 'Main'),
('Pasta', 'Creamy Alfredo pasta with chicken', 12.00, 'Main'),
('Salad', 'Fresh garden salad with vinaigrette', 6.50, 'Appetizer'),
('Soda', 'Carbonated soft drink', 2.50, 'Beverage');
INSERT INTO users (username, password, email) VALUES
('john_doe', 'XohImNooBHFR0OVvjcYpJ3NgPQ1qq73WKhHvch0VQtg=', 'john@example.com');
INSERT INTO orders (user_id, total_price) VALUES
((SELECT id FROM users WHERE username = 'john_doe'), 18.00);
-- =======================================================
-- 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 ...
-- =======================================================
-- 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 ...
-- =======================================================
-- 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 ...
-- =======================================================
-- 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 ...
-- =======================================================
-- INITIAL MENU DATA
-- =======================================================
--
-- Insert at least 3 food or drink items.
--
-- Example categories:
-- - Pizza
-- - Burger
-- - Pasta
-- - Drink
--
-- INSERT INTO ...
-- =======================================================
-- 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 ...;
INSERT INTO order_details (order_id, menu_item_id, quantity, price)
VALUES
((SELECT id FROM orders WHERE user_id = (SELECT id FROM users WHERE username = 'john_doe') ORDER BY id LIMIT 1),
(SELECT id FROM menu_items WHERE name = 'Pizza'), 2, 10.00),
((SELECT id FROM orders WHERE user_id = (SELECT id FROM users WHERE username = 'john_doe') ORDER BY id LIMIT 1),
(SELECT id FROM menu_items WHERE name = 'Burger'), 1, 8.00);