develop

2026-07-12 12:47:46 +03:30
parent 00f990c653
commit bbabd5c04c
26 changed files with 1290 additions and 116 deletions
@@ -0,0 +1,110 @@
+CREATE TABLE users (
+                       id SERIAL PRIMARY KEY,
+                       username VARCHAR(100) NOT NULL UNIQUE,
+                       password_hash VARCHAR(255) NOT NULL,
+                       email VARCHAR(255)
+);
+
+-- =======================================================
+-- MENU ITEM TABLE
+-- =======================================================
+-- Represents available food and drink items.
+-- Requirements:
+-- - Unique identifier
+-- - Name required
+-- - Price positive
+CREATE TABLE menu_items (
+                            id SERIAL PRIMARY KEY,
+                            name VARCHAR(150) NOT NULL,
+                            description TEXT,
+                            price DOUBLE PRECISION NOT NULL CHECK (price > 0),
+                            category VARCHAR(100)
+);
+
+-- =======================================================
+-- ORDER TABLE
+-- =======================================================
+-- Represents orders placed by customers.
+-- Requirements:
+-- - Each order belongs to exactly one user
+-- - A user can have multiple orders
+-- - Use non-reserved table name: orders
+CREATE TABLE orders (
+                        id SERIAL PRIMARY KEY,
+                        user_id INT NOT NULL,
+                        created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                        total_price DOUBLE PRECISION NOT NULL DEFAULT 0 CHECK (total_price >= 0),
+                        CONSTRAINT fk_orders_user
+                            FOREIGN KEY (user_id)
+                                REFERENCES users(id)
+                                ON DELETE CASCADE
+);
+
+-- =======================================================
+-- ORDER DETAIL TABLE
+-- =======================================================
+-- Represents items inside an order.
+-- Requirements:
+-- - Each detail belongs to one order
+-- - Each detail references one menu item
+-- - Quantity > 0
+-- - Store item price at purchase time
+CREATE TABLE order_details (
+                               id SERIAL PRIMARY KEY,
+                               order_id INT NOT NULL,
+                               menu_item_id INT NOT NULL,
+                               quantity INT NOT NULL CHECK (quantity > 0),
+                               price DOUBLE PRECISION NOT NULL CHECK (price > 0),
+                               CONSTRAINT fk_order_details_order
+                                   FOREIGN KEY (order_id)
+                                       REFERENCES orders(id)
+                                       ON DELETE CASCADE,
+                               CONSTRAINT fk_order_details_menu_item
+                                   FOREIGN KEY (menu_item_id)
+                                       REFERENCES menu_items(id)
+                                       ON DELETE RESTRICT
+);
+
+-- =======================================================
+-- INITIAL MENU DATA
+-- =======================================================
+-- Insert at least 3 food/drink items
+INSERT INTO menu_items (name, description, price, category) VALUES
+                                                                ('Margherita Pizza', 'Classic pizza with tomato sauce, mozzarella, and basil', 8.99, 'Pizza'),
+                                                                ('Pepperoni Pizza', 'Pizza topped with pepperoni and cheese', 10.99, 'Pizza'),
+                                                                ('Cheeseburger', 'Beef burger with cheddar cheese and lettuce', 7.50, 'Burger'),
+                                                                ('Pasta Carbonara', 'Creamy pasta with bacon and parmesan', 11.50, 'Pasta'),
+                                                                ('Coca Cola', 'Chilled soft drink', 1.50, 'Drink');
+
+-- =======================================================
+-- OPTIONAL TEST DATA
+-- =======================================================
+-- Sample user for testing (password is hashed placeholder)
+INSERT INTO users (username, password_hash, email) VALUES
+    ('testuser', '$2a$10$dummyhashforTestingOnly12345678901234567890', 'testuser@example.com');
+
+-- Sample order for testing
+INSERT INTO orders (user_id, created_at, total_price)
+VALUES (1, CURRENT_TIMESTAMP, 0);
+
+-- Sample order details for testing
+INSERT INTO order_details (order_id, menu_item_id, quantity, price) VALUES
+                                                                        (1, 1, 2, 8.99),
+                                                                        (1, 5, 2, 1.50);
+
+-- Update total price for the sample order
+UPDATE orders
+SET total_price = (
+    SELECT SUM(quantity * price)
+    FROM order_details
+    WHERE order_id = 1
+)
+WHERE id = 1;
+
+-- =======================================================
+-- VERIFICATION QUERIES
+-- =======================================================
+SELECT * FROM users;
+SELECT * FROM menu_items;
+SELECT * FROM orders;
+SELECT * FROM order_details;