如何在mysqli中更改这行代码

Question

我正在尝试将我的代码从mysql更改为mysqli，但我无法更改这段代码：

while($sqlrow = mysql_fetch_array($sqlresult)) 
{ 
     $room = $sqlrow['Room']; 
     $roomHTML .= "<option value='".$room."'>" . $room . "</option>".PHP_EOL;  
} 


echo $roomHTML; 

我在下面的mysqli代码中没有变量$ sqlrow，我如何将行$room = $sqlrow['Room'];更改为：

完整代码：

    $building = isset($_POST['building']) ? $_POST['building'] : ''; 

  $sql = "SELECT Room FROM Room WHERE Building = ?"; 

 $sqlstmt=$mysqli->prepare($sql);

 $sqlstmt->bind_param("s",$building);


     $sqlstmt->execute(); 

     $sqlstmt->bind_result($dbRoom);


    $roomHTML  = "";  

     while($sqlstmt->fetch()) { 
         $room = $sqlrow['Room']; 
         $roomHTML .= "<option value='".$room."'>" . $room . "</option>".PHP_EOL;  
    } 


    echo $roomHTML; 

     $sqlstmt->execute(); 

上面的代码试图在下拉菜单中显示与其所属建筑相匹配的所有房间。

由于

Answer 1

您没有使用绑定结果var $dbRoom。

// Your output value of interest is $dbRoom as you have bound here:
$sqlstmt->bind_result($dbRoom);
$roomHTML  = "";  

 while($sqlstmt->fetch()) { 
     // $dbRoom holds the value fetched from the result set, since that is what you bound above.
     // Note: added htmlentities() to encode quotes if there are any embedded in the room value.
     $roomHTML .= "<option value='". htmlentities($dbRoom, ENT_QUOTES) ."'>" . htmlspecialchars($dbRoom) . "</option>".PHP_EOL;  
}