web summit demo

web_summit_demo.py

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+import sqlite3
+from datetime import datetime
+
+# Database connection setup
+conn = sqlite3.connect('enterprise_inventory.db')
+cursor = conn.cursor()
+
+# Ensure that the needed table exists
+cursor.execute('''
+CREATE TABLE IF NOT EXISTS inventory (
+    product_id INTEGER PRIMARY KEY,
+    product_name TEXT NOT NULL,
+    quantity INTEGER NOT NULL,
+    last_updated TIMESTAMP NOT NULL
+)
+''')
+conn.commit()
+
+# A class to represent the inventory
+class Inventory:
+    def __init__(self):
+        self._products = self._load_products()
+
+    def _load_products(self):
+        cursor.execute("SELECT * FROM inventory")
+        return {row[0]: {'product_name': row[1], 'quantity': row[2], 'last_updated': row[3]} for row in cursor.fetchall()}
+
+    def add_product(self, product_name, quantity):
+        if not isinstance(product_name, str) or not isinstance(quantity, int):
+            raise ValueError("Invalid input types for product name or quantity.")
+
+        if quantity <= 0:
+            raise ValueError("Quantity must be positive.")
+
+        now = datetime.now()
+        cursor.execute("INSERT INTO inventory (product_name, quantity, last_updated) VALUES (?, ?, ?)",
+                       (product_name, quantity, now))
+        conn.commit()
+        self._products[cursor.lastrowid] = {'product_name': product_name, 'quantity': quantity, 'last_updated': now}
+
+    def remove_product(self, product_id):
+        if product_id not in self._products:
+            raise ValueError("Product ID does not exist in inventory.")
+
+        cursor.execute("DELETE FROM inventory WHERE product_id = ?", (product_id,))
+        conn.commit()
+        del self._products[product_id]
+
+    def update_quantity(self, product_id, quantity_change):
+        if product_id not in self._products:
+            raise ValueError("Product ID does not exist in inventory.")
+
+        new_quantity = self._products[product_id]['quantity'] + quantity_change
+        if new_quantity < 0:
+            raise ValueError("Cannot have negative quantity in inventory.")
+
+        now = datetime.now()
+        cursor.execute("UPDATE inventory SET quantity = ?, last_updated = ? WHERE product_id = ?",
+                       (new_quantity, now, product_id))
+        conn.commit()
+        self._products[product_id].update({'quantity': new_quantity, 'last_updated': now})
+
+    def get_product_info(self, product_id):
+        return self._products.get(product_id)
+
+    def __del__(self):
+        conn.close()
+
+def main():
+    inventory = Inventory()
+
+    # Add a few products
+    inventory.add_product('Laptop', 10)
+    inventory.add_product('Mouse', 50)
+    inventory.add_product('Keyboard', 20)
+
+    # Remove a product
+    inventory.remove_product(2)
+
+    # Update quantity
+    inventory.update_quantity(1, -2)
+
+    # Print information about a product
+    print(inventory.get_product_info(1))
+
+if __name__ == "__main__":
+    main()