暂时不允许财产访问

Question

我有一个简单的函数来从我的数据库删除帐户。我写的如下

public function removeAccount($email) {
    $response = array('code' => 0, 'error' => false);
    $stmt = $this->conn->prepare("SELECT id FROM user WHERE email = ?");
    $stmt->bind_param("s", $email);
    $stmt->execute();
    $result = $stmt->get_result();
    if ($result->num_rows) {
        $user   =  $result->fetch_assoc();
        $id = $user['id'];
        $stmt->close();

        $stmt = $this->conn->prepare("DELETE FROM number_list WHERE user_id = ?");
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $stmt->close();

        $stmt = $this->conn->prepare("DELETE FROM number_status WHERE user_id = ?");
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $stmt->close();

        $stmt = $this->conn->prepare("INSERT INTO old_user(email,serial,premium) SELECT email, device_id, membership FROM user WHERE id = ?");
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $stmt->close();

        $stmt = $this->conn->prepare("DELETE FROM user WHERE id = ?");
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $stmt->close();

        if ($stmt->affected_rows) {
            $response["code"] = 1;
        }
    }

    return $response;
}

它在下面给我警告

if ($stmt->affected_rows) {

我已经搜索了解决它的方法，但没有得到什么错误的想法和什么可以解决它。如果有人能够了解它，请检查并告诉我。非常感谢。

Answer 1

$stmt = $this->conn->prepare("DELETE FROM user WHERE id = ?");
$stmt->bind_param("i", $id);
$stmt->execute();
if($stmt->affected_rows > 0) { $response["code"] = 1; }
$stmt->close();

在这种情况下，我们检查是否有任何行更新。作为参考，这里是mysqli::$affected_rows返回值的用法。

-1 - 查询返回错误;如果execute()已经有错误处理，那就多余了

0 - 没有在UPDATE上更新记录，没有与WHERE子句匹配的行或者没有执行任何查询

大于0 - 返回受影响的行数;与mysqli_result::$num_rows相比SELECT

Answer 2

您正在尝试从已关闭的语句中获取受影响的行数。代替

$stmt->execute();
$stmt->close();
if ($stmt->affected_rows) {
    $response["code"] = 1;
}

使用

$stmt->execute();
$num_affected_rows = $stmt->affected_rows;
$stmt->close();
if ($num_affected_rows) {
    $response["code"] = 1;
}