PHP脚本无法连接到sql数据库

我希望我的脚本连接到数据库，并在其中插入一个简单的apikey。问题是脚本无法连接到数据库。我在电脑上的xampp安装上运行此脚本

脚本：

<?php
    $servername = "127.0.0.1";
    $username = "root@127.0.0.1";
    $password = "root";
    $dbname = "apikey";

    // Create a connection to the server
    $conn = new mysqli ($servername, $username, $password, $dbname);
    // Check the connection to the server
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }

    $sql = "INSERT INTO APIkey (APIkey)
    VALUES ('John Doe')";

    if ($conn->query($sql) === TRUE) {
        echo "New record created successfully";
    } else {
        echo "Error: " .$sql. "<br>" . $conn->error;
    }

    $conn->close();
?>

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用户名上不需要主机

$username = "root";

这就是你所需要的