94 lines
3.2 KiB
Python
94 lines
3.2 KiB
Python
import sqlite3
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class CartDatabase:
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def __init__(self, db_file):
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"""Initialize the CartDatabase with a connection to the SQLite database."""
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self.conn = sqlite3.connect(db_file)
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def add_to_cart(self, user_id, product_id, quantity):
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"""Add a product to the user's cart."""
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sql = "INSERT INTO cart (user_id, product_id, quantity) VALUES (?, ?, ?)"
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try:
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c = self.conn.cursor()
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c.execute(sql, (user_id, product_id, quantity))
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self.conn.commit()
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return c.lastrowid
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except sqlite3.Error as e:
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print(e)
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def get_cart_for_user(self, user_id):
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"""Retrieve the cart items for a specific user."""
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sql = "SELECT * FROM cart WHERE user_id = ?"
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try:
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c = self.conn.cursor()
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c.execute(sql, (user_id,))
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return c.fetchall()
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except sqlite3.Error as e:
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print(e)
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return []
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def update_cart_item(self, user_id, product_id, quantity):
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"""Update the quantity of a specific cart item based on user_id and product_id."""
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sql = "UPDATE cart SET quantity = ? WHERE user_id = ? AND product_id = ?"
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try:
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c = self.conn.cursor()
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c.execute(sql, (quantity, user_id, product_id))
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self.conn.commit()
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except sqlite3.Error as e:
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print(e)
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def remove_from_cart(self, cart_id):
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"""Remove a specific item from the cart."""
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sql = "DELETE FROM cart WHERE id = ?"
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try:
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c = self.conn.cursor()
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c.execute(sql, (cart_id,))
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self.conn.commit()
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except sqlite3.Error as e:
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print(e)
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def clear_cart(self, user_id):
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"""Clear all items from a user's cart."""
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sql = "DELETE FROM cart WHERE user_id = ?"
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try:
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c = self.conn.cursor()
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c.execute(sql, (user_id,))
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self.conn.commit()
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except sqlite3.Error as e:
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print(e)
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def get_cart_total(self, user_id):
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"""Calculate the total cost of all items in a user's cart."""
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sql = "SELECT SUM(products.price * cart.quantity) FROM cart JOIN products ON cart.product_id = products.id WHERE cart.user_id = ?"
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try:
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c = self.conn.cursor()
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c.execute(sql, (user_id,))
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return c.fetchone()[0]
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except sqlite3.Error as e:
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print(e)
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return 0
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def main():
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database = "db/shop.db"
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cart_db = CartDatabase(database)
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ex_user_id = 1
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# delete all cart items
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cart_db.clear_cart(ex_user_id)
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# user id, product id, quantity
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cart_db.add_to_cart(ex_user_id, 1, 2)
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cart_db.add_to_cart(ex_user_id, 3, 5)
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print(f"Cart items for user {ex_user_id}:", cart_db.get_cart_for_user(ex_user_id))
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print(f"Total cost for user {ex_user_id}:", cart_db.get_cart_total(ex_user_id))
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# user id, product id, quantity
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cart_db.update_cart_item(ex_user_id, 3, 3)
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print(f"Cart items for user {ex_user_id}:", cart_db.get_cart_for_user(ex_user_id))
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print(f"Total cost for user {ex_user_id}:", cart_db.get_cart_total(ex_user_id))
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if __name__ == "__main__":
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main() |