Question

I have this problem I can’t figure out,
I query the DB this way:

$stmt = $this->pdo->prepare('SELECT customer_name FROM active_users WHERE a_id= ?');
$stmt->execute(array($a_id));
$c_name = $stmt->fetch(PDO::FETCH_OBJ);
API::writeToLog('CMD=leave , Customer_Name = ' . $c_name->customer_name, $customer_name);

This: $c_name->customer_name gives the following error :

Notice: Trying to get property of non-object

How can I iterate my database, and whats the difference between fetch and fetchAll ? which should I use?

This is the DB schema:

+---------------+--------------+------+-----+---------+-------+
| Field         | Type         | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+-------+
| a_id          | varchar(40)  | NO   | PRI | NULL    |       |
| token         | varchar(64)  | NO   |     | NULL    |       |
| nick          | varchar(255) | NO   |     | NULL    |       |
| ip            | varchar(32)  | NO   |     | NULL    |       |
| customer_name | varchar(255) | YES  |     | NULL    |       |
+---------------+--------------+------+-----+---------+-------+

thanx!

EDIT: fixed a typo..

Answer 1

You should add an if condition to check whether the record exists.

$stmt = $this->pdo->prepare('SELECT customer_name FROM active_users WHERE udid = ?');
$stmt->execute(array($udid));
if ($c_name = $stmt->fetch(PDO::FETCH_OBJ)) {
  API::writeToLog('CMD=leave , Customer_Name = ' . $c_name->customer_name, $customer_name);
}

For fetchAll, it returns all the records at once.

As @Darragh pointed out, you have a typo for $c_name.