求助：数据库的MySql访问被拒绝

Question

我尝试用PHP连接 Mysql。当我不使用数据库时，它工作得很好。但是当我尝试连接数据库时会出现以下错误：

Warning: mysqli::__construct(): (HY000/1044): Access denied for user ''@'localhost' to database 'db_test' in C:\xampp\htdocs\Projects\DemoProject\demo2.php on line 13 Connection failed: Access denied for user ''@'localhost' to database 'db_test'

我的PHP代码如下：

<?php
$servername = "localhost";
$username = "username";
$password = "";
$dbname = "db_test";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
else 
    echo "Connected Successfully";
?>

Answer 1

I actually used the wrong username. To check the username and servername just run the query given below-

select CURRENT_USER();

In general, username set as root and server name set as localhost by default.