laravel配置mssql

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;//需要引入这个单元，否则无法操作数据库

class DBtestController extends Controller
{
    public function index(){
        $pdo = DB::connection()->getPdo();
        dd($pdo);
        return ‘hello world!‘;
    }
}

DB_CONNECTION=sqlsrv
DB_HOST=127.0.0.1
DB_PORT=1433
DB_DATABASE=数据库名
DB_USERNAME=sa
DB_PASSWORD=passworld