查询met num_rows，bind_param和fetch_assoc

Question

在num_rows的组合中，bind_param en fetch（_assoc）。

我在$ salt = $ saltuitkomst [＆＃39; salt＆＃39;];

中得不到任何结果

$ user = 195

$ rows正在给出数字1

没有错误消息

$saltqry = "SELECT
                    salt,
                    mw_gegevens_groep
            FROM 
                    mw_gegevens
            WHERE   
                    mw_gegevens_persnr = ?
            ";
            if(!$statement = $connection->prepare($saltqry))
            {
            echo "Query error:.". $connection->error();
            } else { 
                if(!$statement->bind_param('i', $user)){
                echo "bind param did not work";
                }else{
                $statement->execute();
                $statement->store_result();
                $rows = $statement->num_rows;   
                $saltuitkomst = $statement->fetch();
                }
            }
        if($rows == 0) {
                $salt='';
        } else {
                $salt = $saltuitkomst['salt'];
                echo '-'.$salt.'-';
        }

Answer 1

$saltqry = "SELECT
                    salt,
                    mw_gegevens_groep
            FROM 
                    mw_gegevens
            WHERE   
                    mw_gegevens_persnr = ?
            ";
            if(!$statement = $connection->prepare($saltqry))
            {
            echo "Query error:.". $connection->error();
            } else { 
                if(!$statement->bind_param('i', $user)){
                echo "bind param did not work";
                }else{
                $statement->execute();
                $statement->store_result();
                $statement->bind_result($salt, $group); 
                $saltuitkomst = $statement->fetch();
                if($saltuitkomst) {
                   echo '-'.$salt.'-';
                } else {
                   $salt='';
                }
                $statement->close();
                }
        }