php - 主题更新失败的MySQL

    Subject Update Failed!!You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1
I am stuck here can anyone help me what I am missing in this code.The error is in Update Query.

一切正常，编写代码时我没有收到任何语法错误（我使用的是Dreamviwer代码编辑器软件。但是，当我运行它时，出现此错误：
//处理表格

    $id= $current_subject["Id"];
$name=mysql_prep($_POST["Name"]);
$position=(int)$_POST["Position"];
$visible=(int)$_POST["Visible"];

$query="UPDATE subjects SET Name='{$name}',Position=$position,Visible=$visible WHERE Id={$id}";

$result= mysqli_query($conn, $query);
if($result && mysqli_affected_rows($conn)==1){
    //success
    $_SESSION["message"]="Subject updated.";
    redirect_to("manage_content.php");

}else{

    //Failure
   $message="Subject Update Failed" . $conn->error;

    }

最佳答案

您很可能输入了错误的参数名称。 cho首先选择您的参数。

并使用准备好的语句来防止SQL注入：

$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
$query="UPDATE subjects SET Name = ? ,Position = ?,Visible = ? WHERE Id = ?";
$stmt = $dbh->prepare($query);
$stmt->bindParam(1, $name);
$stmt->bindParam(2, $position);
$stmt->bindParam(3, $visible);
$stmt->bindParam(4, $id);
$stmt->execute();
$stmt->fetchAll();

进一步阅读：PDO。

关于php - 主题更新失败的MySQL，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45611307/