我试图只用PDO编写更新查询，但我无法执行代码？try {

$conn = new PDO("mysql:host=$hostdb; dbname=$namedb", $userdb, $passdb);

$conn->exec("SET CHARACTER SET utf8"); // Sets encoding UTF-8

$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = "UPDATE `access_users`

(`contact_first_name`,`contact_surname`,`contact_email`,`telephone`)

VALUES (:firstname, :surname, :telephone, :email);

";

$statement = $conn->prepare($sql);

$statement->bindValue(":firstname", $firstname);

$statement->bindValue(":surname", $surname);

$statement->bindValue(":telephone", $telephone);

$statement->bindValue(":email", $email);

$count = $statement->execute();

$conn = null; // Disconnect

}

catch(PDOException $e) {

echo $e->getMessage();

}

最佳答案

您的UPDATE语法错误

您可能打算更新一行而不是全部更新，因此您必须使用WHERE子句来定位您的特定行

改变

UPDATE `access_users`

(`contact_first_name`,`contact_surname`,`contact_email`,`telephone`)

VALUES (:firstname, :surname, :telephone, :email)

到

UPDATE `access_users`

SET `contact_first_name` = :firstname,

`contact_surname` = :surname,

`contact_email` = :email,

`telephone` = :telephone

WHERE `user_id` = :user_id -- you probably have some sort of id