用PHP创建了login数据库，在MySQL中看不到

<?php

header("Content-type:text/html;charset=utf-8");    //设置编码

$servername = "localhost";

$username = "root";

$password = "1234";

$dbname = "login";

// 创建连接

$conn = mysqli_connect($servername, $username, $password, $dbname);

 mysqli_set_charset($conn,'utf8'); //设定字符集 

// 检测连接

if (!$conn) {

    die("连接失败: " . mysqli_connect_error());

}

// 使用 sql 创建数据表

$sql = "CREATE TABLE user (

 id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,

 username VARCHAR(30) NOT NULL,

 password VARCHAR(30) NOT NULL

 );";

if (mysqli_query($conn, $sql)) {

    echo "数据表 user 创建成功";

} else {

    echo "创建数据表错误: " . mysqli_error($conn);

}

mysqli_close($conn);

?>