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PHP

angel angel
angel angel
6,620 Points

how do I retrieve the information from one page to the next page with php and SQL query to update?

So This is the code for my application but the thing that is not working is when I submit the information the information is not showing in the other page.

php 

index.php

<?php
require_once('database.php');


// Get category ID
if (!isset($category_id)) {
    $category_id = filter_input(INPUT_GET, 'category_id', 
            FILTER_VALIDATE_INT);
    if ($category_id == NULL || $category_id == FALSE) {
        $category_id = 1;
    }
}

// Get name for selected category
$queryCategory = 'SELECT * FROM category
                  WHERE categoryID = :category_id';
$statement1 = $db->prepare($queryCategory);
$statement1->bindValue(':category_id', $category_id);
$statement1->execute();
$category = $statement1->fetch();
$category_name = $category['categoryName'];
$statement1->closeCursor();


// Get all categories
$query = 'SELECT * FROM categories
                       ORDER BY categoryID';
$statement = $db->prepare($query);
$statement->execute();
$categories = $statement->fetchAll();
$statement->closeCursor();

// Get products for selected category
$queryProducts = 'SELECT * FROM products
                  WHERE categoryID = :category_id
                  ORDER BY productID';
$statement3 = $db->prepare($queryProducts);
$statement3->bindValue(':category_id', $category_id);
$statement3->execute();
$products = $statement3->fetchAll();
$statement3->closeCursor();
?>





<!DOCTYPE html>
<html>

<!-- the head section -->
<head>
    <title>My Guitar Shop</title>
    <link rel="stylesheet" type="text/css" href="main.css" />
</head>

<!-- the body section -->
<body>
<header><h1>Product Manager</h1></header>
<main>
    <h1>Product List</h1>

    <aside>
        <!-- display a list of categories -->
        <h2>Categories</h2>
        <nav>
        <ul>
            <?php foreach ($categories as $category) : ?>
            <li><a href=".?category_id=<?php echo $category['categoryID']; ?>">
                    <?php echo $category['categoryName']; ?>
                </a>
            </li>
            <?php endforeach; ?>
        </ul>
        </nav>          
    </aside>

    <section>
        <!-- display a table of products -->
        <h2><?php echo $category_name; ?></h2>
        <table>
            <tr>
                <th>Code</th>
                <th>Name</th>
                <th class="right">Price</th>
                <th>&nbsp;</th>
                  <th>&nbsp;</th>
                   <th>&nbsp;</th>
            </tr>

            <?php foreach ($products as $product) : ?>
            <tr>
                <td><?php echo $product['productCode']; ?></td>
                <td><?php echo $product['productName']; ?></td>
                <td class="right"><?php echo $product['listPrice']; ?></td>
                <td>
                </td>
                <td><form action="delete_product.php" method="post">
                    <input type="hidden" name="product_id"
                           value="<?php echo $product['productID']; ?>">
                    <input type="hidden" name="category_id"
                           value="<?php echo $product['categoryID']; ?>">
                    <input type="submit" value="Delete">
                </form></td>
                <td><a href="update_form.php?product_id=<?php echo $product['productID'];?>">Edit</a></td>
            </tr>
            <?php endforeach; ?>
        </table>
        <p><a href="add_product_form.php">Add Product</a></p>
        <p><a href="category_list.php">List Categories</a></p>        
    </section>
</main>
<footer>
    <p>&copy; <?php echo date("Y"); ?> My Guitar Shop, Inc.</p>
</footer>
</body>
</html>



update_form.php
<?php

require('database.php');

$product_id = $_GET['product_id'];

$query = 'SELECT *
          FROM products
          where productID = :product_id';
$statement = $db->prepare($query);
$statement ->bindValue(':product_id', $product_id);
$statement->execute();
$product = $statement->fetch();
$statement->closeCursor();

// Get all categories
$query = 'SELECT * FROM categories
                       ORDER BY categoryID';
$statement = $db->prepare($query);
$statement->execute();
$categories = $statement->fetchAll();
$statement->closeCursor();


?>
<!DOCTYPE html>
<html>

<!-- the head section -->
<head>
    <title>My Guitar Shop</title>
    <link rel="stylesheet" type="text/css" href="main.css">
</head>

<!-- the body section -->
<body>
    <header><h1>Product Manager</h1></header>

    <main>Edit Product</h1>
        <form action="update_product.php" method="post"
              id="update_form">

            <label>Category:</label>
            <select name="category_id">
            <?php foreach ($categories as $category) : ?>
                <option value="<?php echo $category['categoryID']; ?>">
                    <?php echo $category['categoryName']; ?>
                </option>
            <?php endforeach; ?>
            </select><br>


            <label>Code:</label>
            <input type="text" name="code" value="<?php echo $product['productCode']; ?>" ><br>

            <label>Name:</label>
            <input type="text" name="name" value="<?php echo $product['productName']; ?>"><br>

            <label>List Price:</label>
            <input type="text" name="price" value="<?php echo $product['listPrice']; ?>"><br>

           <label>&nbsp;</label>
     <input type="submit" value="Edit">

        </form>

        <p><a href="index.php">View Product List</a></p>
    </main>

    <footer>
        <p>&copy; <?php echo date("Y"); ?> My Guitar Shop, Inc.</p>
    </footer>
</body>
</html>



update_product.php
<?php
// Get the product data

$category_id = filter_input(INPUT_POST, 'category_id', FILTER_VALIDATE_INT);
$code = filter_input(INPUT_POST, 'code');
$name = filter_input(INPUT_POST, 'name');
$price = filter_input(INPUT_POST, 'price', FILTER_VALIDATE_FLOAT);




// Validate inputs
if ($category_id == null || $category_id == false || 
        $code == null || $name == null || $price == null || $price == false) {
    $error = "Invalid product data. Check all fields and try again.";
    include('error.php');
} else {
    require_once('database.php');

    // Add the product to the database  
    $query = "UPDATE products
                 SET categoryID = :category_id, 
                productCode = :code, 
                 productName = :name, 
                 listPrice= :price

            WHERE  categoryID = :category_id , productCode = :code ,productName = :name, 
                 listPrice = :price ";


    $statement = $db->prepare($query);
    $statement->bindValue(':category_id', $category_id);
    $statement->bindValue(':code', $code);
    $statement->bindValue(':name', $name);
    $statement->bindValue(':price', $price);
    $statement->execute();
    $statement->closeCursor();


    // Display the Product List page
    include('index.php');
}
?>