php - 无法更新表 PDO 更新

Question

我正在尝试使用 PDO 更新数据库中的表。目前我正在提交表单，除了白屏什么都没有，我已经启用了所有错误报告选项，但仍然只有白屏。我一直盯着代码看一辈子，但仍然可以'解决问题。向正确的方向插入将不胜感激......谢谢

require('includes/config.php'); 

//if not logged in redirect to login page
if(!$user->is_logged_in()){ header('Location: login.php'); } 

$signedin = $_SESSION['username'];

$sql = "UPDATE member SET firstname = :firstname, 
            lastname = :lastname, 
            username = :username,  
            email = :email,
            age = :age,    
            country = :country  
            where username = $signedin";
$stmt = $db->prepare($sql);                                  
$stmt->bindParam(':firstname', $_POST['firstname'], PDO::PARAM_STR);       
$stmt->bindParam(':lastname', $_POST['$lastname'], PDO::PARAM_STR);    
$stmt->bindParam(':username', $_POST['username'], PDO::PARAM_STR);
// use PARAM_STR although a number  
$stmt->bindParam(':email', $_POST['email'], PDO::PARAM_STR); 
$stmt->bindParam(':age', $_POST['age'], PDO::PARAM_STR);   
$stmt->bindParam(':country', $_POST['country'], PDO::PARAM_INT);   
$stmt= $db->execute($sql);
?>

Answer 1

execute() 函数不需要 $sql(您在 prepare() 中提供)

$stmt->execute();

接下来，您应该将所有数据传递到准备好的语句中，否则您就达不到目的(这是最大的安全性)。所以让我们删除

$sql = "UPDATE member SET firstname = :firstname, 
            lastname = :lastname, 
            username = :username,  
            email = :email,
            age = :age,    
            country = :country  
            where username = :username";
//snip
$stmt->bindParam(':username', $_SESSION['username'], PDO::PARAM_STR);