Question

代码：

// get value of id that sent from address bar
$id=filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT);
if ($id === false) {
    //filter failed
    die('id not a number');
}
if ($id === null) {
    //variable was not set
    die('id not set');
}

//white list table 
$safe_tbl_name = '';
switch($tbl_name){
    case 'Table1': 
        $safe_tbl_name = 'MyTable1';
        break;
    case 'Table2':
        $safe_tbl_name = 'MyTable2';
        break;
    default:
        $safe_tbl_name = 'forum_questions';
};

$sql="SELECT * FROM `$safe_tbl_name` WHERE id=?";
if ($stmt = $con->prepare($sql)){
$stmt->bind_param("s", $id);
$stmt->execute();
}
else{
   //error !! don't go further
   var_dump($con);
}
$stmt->bind_result($result);

$rows = $stmt->fetch_all(MYSQLI_ASSOC);
?>

<table width="400" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td><table width="100%" border="0" cellpadding="3" cellspacing="1" bordercolor="1" bgcolor="#FFFFFF">
<tr>
<td bgcolor="#F8F7F1"><strong><?php echo $rows['topic']; ?></strong></td>
</tr>

<tr>
<td bgcolor="#F8F7F1"><?php echo $rows['detail']; ?></td>
</tr>

<tr>
<td bgcolor="#F8F7F1"><strong>By :</strong> <?php echo $rows['name']; ?> <strong>Email : </strong><?php echo $rows['email'];?></td>
</tr>

<tr>
<td bgcolor="#F8F7F1"><strong>Date/time : </strong><?php echo $rows['datetime']; ?></td>
</tr>
</table></td>
</tr>
</table>

我收到了这个错误：

警告：mysqli_stmt :: bind_result（）：绑定变量的数量不包含匹配预备语句中的字段数第47行的C：\ wamp64 \ www \ forrrumm \ view_topic.php

而且：

致命错误：调用未定义的方法mysqli_stmt :: fetch_all（）in 第49行的C：\ wamp64 \ www \ forrrumm \ view_topic.php

Answer 1

您没有正确使用bind_result()。

将结果集中的列绑定到变量。

您正在尝试将整个结果集绑定到单个变量中。您需要为结果集中的每个列提供一个变量。

$stmt->bind_result($topic,$detail,$email,$name,$datetime);

以下是适合的地方：

$sql="SELECT `topic`,`detail`,`email`,`name`,`datetime` FROM `$safe_tbl_name` WHERE id=?";
if($stmt=$con->prepare($sql)){
    $stmt->bind_param("s",$id);
    $stmt->execute();
    $stmt->bind_result($topic,$detail,$email,$name,$datetime);
    //while($stmt->fetch()){  not wrong, but not necessary to loop if only one row
    $stmt->fetch();  
        echo "<table width=\"400\" border=\"0\" align=\"center\" cellpadding=\"0\" cellspacing=\"1\" bgcolor=\"#CCCCCC\">";
            echo "<tr>";
                echo "<td>";
                    echo "<table width=\"100%\" border=\"0\" cellpadding=\"3\" cellspacing=\"1\" bordercolor=\"1\" bgcolor=\"#FFFFFF\">";
                        echo "<tr>";
                            echo "<td bgcolor=\"#F8F7F1\"><strong>$topic</strong></td>";
                        echo "</tr>";
                        echo "<tr>";
                            echo "<td bgcolor=\"#F8F7F1\">$detail</td>";
                        echo "</tr>";
                        echo "<tr>";
                            echo "<td bgcolor=\"#F8F7F1\"><strong>By :</strong>$name<strong>Email : </strong>$email</td>";
                        echo "</tr>";
                        echo "<tr>";
                            echo "<td bgcolor=\"#F8F7F1\"><strong>Date/time : </strong>$datetime</td>";
                        echo "</tr>";
                    echo "</table>";
                echo "</td>";
            echo "</tr>";
        echo "</table>";
    //}
    $stmt->close();
}

或者，如果要在SELECT中使用*，可以尝试以下非bind_result方法。（我在线阅读的所有示例仅在SELECT中不使用*时使用bind_result。

if($stmt->execute()){
    $result=$stmt->get_result();
    $rows[]=$result->fetch_assoc();
}else{
    echo "execute failed";  // but I don't think this is your problem
}
// $rows['topic']
// $rows['detail']
// $rows['email']
// $rows['name']
// $rows['datetime']

bind_result（） - 变量数量与字段数量不匹配

1 个答案: