How to implement the shopping cart function in PHP Developer City
With the development of the e-commerce industry, more and more enterprises and individual merchants choose to build their own online malls to conduct business. As one of the important functions of the e-commerce platform, the shopping cart is responsible for key links such as product selection, adding to the shopping cart, and settlement. This article will introduce how to use PHP language to implement a simple and efficient shopping cart function.
1. Database design
First, we need to design the database structure required for the shopping cart. Generally speaking, the shopping cart function requires two main database tables: the product table and the shopping cart table.
CREATE TABLE product
(
id
int(11) NOT NULL AUTO_INCREMENT,
name
varchar(255) NOT NULL,
price
decimal(10,2) NOT NULL,
stock
int(11) NOT NULL,
PRIMARY KEY (id
)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE cart
(
id
int(11) NOT NULL AUTO_INCREMENT,
product_id
int(11) NOT NULL,
quantity
int(11) NOT NULL,
PRIMARY KEY (id
)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
2. Implementation of shopping cart function
After the database design is completed, we can start to implement the shopping cart function.
$productId = $_POST['product_id'];
$quantity = $_POST['quantity'];
// First Check whether the product already exists in the shopping cart table
$checkCartItemQuery = "SELECT * FROM cart WHERE product_id = $productId";
$checkCartItemResult = $conn->query($checkCartItemQuery);
if ($checkCartItemResult->num_rows > 0) {
// Update the quantity of items already in the cart
$updateCartItemQuery = "UPDATE cart SET quantity = quantity $quantity WHERE product_id = $productId";
$conn->query($updateCartItemQuery);
} else {
// Insert new items into the shopping cart
$insertCartItemQuery = "INSERT INTO cart (product_id, quantity) VALUES ($ productId, $quantity)";
$conn->query($insertCartItemQuery);
}
$cartItemId = $_POST['cart_item_id'];
$quantity = $_POST['quantity'];
// Update The quantity of items in the shopping cart
$updateCartItemQuery = "UPDATE cart SET quantity = $quantity WHERE id = $cartItemId";
$conn->query($updateCartItemQuery);
$cartItemId = $_POST['cart_item_id'];
// Delete items from the shopping cart
$deleteCartItemQuery = "DELETE FROM cart WHERE id = $cartItemId";
$conn->query($deleteCartItemQuery);
// Get the list of products in the shopping cart
$cartItemsQuery = "SELECT cart.id, product.id as product_id, product.name, product.price , cart.quantity
FROM cart
INNER JOIN product ON cart.product_id = product.id";
$cartItemsResult = $conn->query($cartItemsQuery);
while ( $row = $cartItemsResult->fetch_assoc()) {
// Output the product information in the shopping cart here
}
Through the above code implementation, we can easily implement a Basic shopping cart functionality. Of course, according to actual needs, we can add more functions, such as clearing the shopping cart, checkout, etc.
Summary:
The shopping cart function is one of the indispensable core functions of the e-commerce platform. By using PHP language and appropriate database design, we can flexibly implement an efficient and easy-to-use shopping cart. Function. I hope that the introduction in this article will be helpful to the implementation of the shopping cart function in the PHP Developer City.
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