Question

I have set the PHP variable $accountnumber to be that of the user who is viewing their profile page. On the page, I have a block with the user’s information populated from the database, and I have a list of all products that we have, and I want to put a check mark next to each one that the customer has by assigning a class to it.

Here are my tables:

products
id | name | url    | weight
100  p1     p1.html  1
101  p2     p2.html  2
102  p3     p3.html  3
103  p4     p4.html  4
104  p5     p5.html  5
105  p6     p6.html  6

products_accounts
account_number | product_id
0000001           100
0000001           104
0000001           105
0000002           101
0000002           103
0000002           104
0000002           105
0000003           100
0000003           102

I tried a LEFT OUTER JOIN, but was not able to determine if the $accountnumber matched an account_number in the products_accounts table for a specific product_id. The only way that I was able to accomplish this was to add a WHERE statement like this:

WHERE products_acccounts.account_number = '$accountnumber'

It gave the proper class to the product, but only showed the product that they had instead of all.

Here’s my code:

$sql ="
SELECT
    products.id,
    products.name,
    products.url,
    products_accounts.account_number
FROM
    products
LEFT OUTER JOIN
    products_accounts
ON
    products.id = products_accounts.product_id

";

$sql .="
GROUP BY
    products.id
ORDER BY
    products.weight
";

$result = mysql_query($sql);
while($row = mysql_fetch_array($result)) {
    echo '<span class="'; if($row['account_number'] == '$accountnumber')
    { echo'product_yes">'; } else { echo 'product_no">'; }
    echo '<a href="' . $row['url'] . '">' . $row['name'] . '</a><br /></span>';
}

If a customer has all product except P2 and P5, it SHOULD display like this:

✓P1

P2

✓P3

✓P4

P5

✓P6

Answer 1

$getproducts = mysql_query("
SELECT id, name, url
FROM products
ORDER BY weight ASC");

while ($rowproducts = mysql_fetch_assoc($getproducts)) {

$product_id = $rowproduct['id'];
$product_name = $rowproduct['name'];
$product_url = $rowproduct['url'];

$getuserhasproduct = mysql_query("
SELECT DISTINCT product_id
FROM products_accounts
WHERE account_number = $accountnumber
AND product_id = $product_id");
$user_has_product = mysql_num_rows($getuserhasproduct);

if($user_has_product){
$class = "checked";
}

echo "<span class='$class'><a href='$product_url'>$product_name</a></span>";
unset($class);
} // end loop 

This might help with performance

$getproducts = mysql_query("SELECT id, name, url,
(SELECT DISTINCT product_id
FROM products_accounts
WHERE account_number = '$accountnumber'
AND product_id = products.id) AS product_count
FROM products
ORDER BY weight ASC");

while ($rowproducts = mysql_fetch_assoc($getproducts)) {

$product_id = $rowproduct['id'];
$product_name = $rowproduct['name'];
$product_url = $rowproduct['url'];
$product_count = $rowproduct['product_count'];

if($product_count > 0){
$class = "checked";
}

echo "<span class='$class'><a href='$product_url'>$product_name</a></span>";
unset($class);
} // end loop