参考文章 https://www.cnblogs.com/meng1314-shuai/p/7232080.html
#### 1. bootstrap/app.php
```php
$app->register(App\Providers\EventServiceProvider::class);
```
#### 2. app/Providers/EventServiceProvier.php
```php
<?php
namespace App\Providers;
use Illuminate\Database\Events\StatementPrepared;
use Laravel\Lumen\Providers\EventServiceProvider as ServiceProvider;
class EventServiceProvider extends ServiceProvider
{
/**
* The event listener mappings for the application.
*
* @var array
*/
protected $listen = [
'App\Events\SomeEvent' => [
'App\Listeners\EventListener',
],
];
public function boot()
{
app('events')->listen(StatementPrepared::class, function ($event) {
$event->statement->setFetchMode(\PDO::FETCH_ASSOC);
});
}
}
```
