Prepared语句返回false，普通查询返回true

Question

I'm about to rip out my own hair, i've been looking at this 5 lines for the past 3 hours, and i can't for the sake of my sanity find out what's wrong with it.

The connection is fine:

$db = new PDO('mysql:host='.$config['database']['host'].';dbname='.$config['database']['name'],$config['database']['username'],$config['database']['password']);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

Then i run this statement:

$product = $db->prepare('SELECT * FROM products JOIN suppliers ON products.supplier_id = suppliers.id WHERE products.partnumber=:partnumber');
$product -> execute( array( ':partnumber' => $_POST['partnumber'] ) );

$p = $product->fetchAll(PDO::FETCH_ASSOC);

if i do var_dump($p) it says bool(false). But if i run the statement in my db manually, it finds the product perfectly fine.

Just after the beforementioned statement, i run this command:

$cu = current($db->query('SELECT currency_code FROM countries JOIN users ON users.country = countries.iso_alpha2 WHERE users.id="'.$_SESSION['userid'].'"')->fetch());

Which works perfectly fine, it returns the currency as i told it to.

So, my question it. Why doesn't my prepared statement work?

EDIT:

I've tried to run $db->errorInfo, it returns NULL

Answer 1

So, my question it. Why doesn't my prepared statement work?

As the request are trully different, there is no point comparing them.

If execute returns false, then it means you made an error in your request. For example, you misspelled a table name.

To debug your query, the simplest way is to use var_dump($db->errorInfo());.

You can also try to debug your script step by step thanks to XDebug.