laravel หากสร้าง project ขึ้นมาใหม่จำเป็นต้อง create laravel ขึ้นมาใหม่ไหม

'databbase_dev' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST_DEV', '127.0.0.1'),
            'port' => env('DB_PORT_DEV', '3306'),
            'database' => env('DB_DATABASE_DEV', 'forge'),
            'username' => env('DB_USERNAME_DEV', 'forge'),
            'password' => env('DB_PASSWORD_DEV', ''),
            'unix_socket' => env('DB_SOCKET_DEV', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'strict' => true,
            'engine' => null,
        ],
        'database_pro' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST_PRO', '127.0.0.1'),
            'port' => env('DB_PORT_PRO', '3306'),
            'database' => env('DB_DATABASE_PRO', 'forge'),
            'username' => env('DB_USERNAME_PRO', 'forge'),
            'password' => env('DB_PASSWORD_PRO', ''),
            'unix_socket' => env('DB_SOCKET_PRO', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'strict' => true,
            'engine' => null,
        ],

$model->setConnection("databbase_dev");
or 
$model->setConnection("databbase_pro");