你好我试图连接laravel 5.4与postgres，更新数据库配置文件和运行php artisan migrate后，出现以下错误：

[Illuminate\Database\QueryException]
 could not find driver (SQL: select * from information_schema.tables where t
 able_schema = public and table_name = migrations)
[PDOException]
 could not find driver

字符串
这是我的.env文件

DB_CONNECTION=pgsql
DB_HOST=127.0.0.1
DB_PORT=5432
DB_DATABASE=Portail
DB_USERNAME=php
DB_PASSWORD=php

型
这是我的database.php文件

'default' => env('DB_CONNECTION', 'pgsql'),
 'pgsql' => [
            'driver' => 'pgsql',
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '5432'),
            'database' => env('DB_DATABASE', 'Portail'),
            'username' => env('DB_USERNAME', 'php'),
            'password' => env('DB_PASSWORD', 'php'),
            'charset' => 'utf8',
            'prefix' => '',
            'schema' => 'public',
            'sslmode' => 'prefer', ],

型
我通常使用phpPgAdmin