Question

I’m getting a Call to a member function fetchColumn() on a non-object error when I’m executing my query with a mysql prepared statement on PHP

$result= $dbh->prepare("SELECT COUNT(*) FROM table WHERE id_1 = ? AND id_2 = ?");
$result->execute(array($id_1,$id_2))->fetchColumn();
echo count($result);

What is the reason for this error? Am I writing the statement incorrectly?

Thanks

Answer 1

PDOStatement::execute returns a boolean to check whether your query has executed properly. You can only chain method calls if each methods returns the reference of your PDOStatement object. You want to do this

$result= $dbh->prepare("SELECT COUNT(*) FROM table WHERE id_1 = ? AND id_2 = ?");
$result->execute(array($id_1,$id_2));
echo $result->fetchColumn();