SQLSTATE [HY000] [2002]无法连接，因为计算机拒绝连接

Question

我正在尝试在lavarel中运行一个网站，但我一直收到错误消息。我输入了正确的密码和用户名，同时发生连接被计算机拒绝的错误。

.env文件

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=''
DB_USERNAME=''
DB_PASSWORD=''        db, username and ps are filled in

配置/ database.php中

'mysql' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', 'localhost'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'strict' => true,
            'engine' => null,
        ],

status