lianjie_admin/app/Providers/AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
        \Schema::defaultStringLength(191);
//        DB::listen(function($query){
//            $sql = $query->sql;
//            $bingings = $query->bindings;
//            $time = $query->time;
//            Log::debug(compact('sql','bingings','time'));
//        });
    }
}