获取行数-mysqli

Question

I am trying this code but i want to know what is the number of results of this query. If do the same query in mysql console I get 4 results, but with this code I get 0 rows. What is the correct way to get the number of rows ?

 function check_oferta_existe($db, $id, $id_oferta) {
            $sql = $db -> prepare("
            SELECT COUNT(offer)
            FROM offer
            WHERE company_users_id_user1 = ? AND offer = ? AND state = 0
            ");

            $sql -> bind_param('is', $id, $oferta);
            $sql -> execute();
            $sql -> fetch();
            $sql->store_result();
            $rows = $sql->num_rows;

            var_dump($rows); // 0, should be 4
            if ($rows == 1) {
                return true;
            }
            else {
                return false;
            };
        }

Answer 1

$sql->fetch() is not a function - try $sql->fetch_all() .

That should fetch all the rows for you, and then the $sql->num_rows variable should be correct.

Answer 2

I see two errors in your code. When you do this statement:

$sql -> bind_param('is', $id, $oferta);

you use $oferta but seems (looking at the function parameters) that the var should be $id_oferta .

Moreover, after the closing bracket of your else you have a semicolon which should not be there.