尝试获取行数时，PDO上的fetchColumn错误

Question

I'm trying to move to PDO.

I want to do a classic query for checking number of rows, in mysql I would have done mysql_num_rows_result but I've read somewhere that in PDO it does not work.

So I've tried with a fetch column using the following code :

global $bdd;
            $login = $bdd->query("SELECT
                   COUNT
                    FROM spb_clients_acces_compte,
                         spb_clients_infos_generales
                    WHERE spb_clients_acces_compte.spb_clients_acces_compte_e_mail = '{$email}'
                    AND spb_clients_acces_compte.spb_clients_acces_compte_pwd_md5 = '{$pass}'
                    AND spb_clients_acces_compte.spb_clients_acces_compte_admin = 1");
            $reponse = $bdd->fetchColumn();
            if ($reponse == 0):

            elseif ($reponse == 1):

            else:
            endif;
            var_dump($reponse);

This return to me :

( ! ) Fatal error: Call to undefined method PDO::fetchColumn() in C:\wamp\www\spb2016\admin\core\login.php on line 20

Line 20 is : $reponse = $bdd->fetchColumn();

I've tried many things with no success

Anykind of help will be much appreciated.

Answer 1

First of all, you need to add a column to your COUNT function. COUNT is a mysql function that returns the number of whatever parameter you pass it, so COUNT(id) would work.

Second, you must use the PDOStatement in order to fetch results. Replace

$reponse = $bdd->fetchColumn();

with

$reponse = $login->fetchColumn();