查詢符合num_rows，bind_param和fetch_assoc

Question

在這個num_rows的組合中，bind_param en fetch（_assoc）。

我在$ salt = $ saltuitkomst ['salt']中沒有得到任何結果;

$用戶= 195

$行是給數1作爲結果

無錯誤消息

$saltqry = "SELECT 
        salt, 
        mw_gegevens_groep 
      FROM 
        mw_gegevens 
      WHERE 
        mw_gegevens_persnr = ? 
      "; 
      if(!$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(); 
       } 
     }