目录app\Providers\AppServiceProvider.php

public function boot()
{
    DB::listen(function ($event) {
        $sql = str_replace("?", "'%s'", $event->sql);
        $log = vsprintf($sql, $event->bindings);
        Log::debug($log);
    });
    //
    Schema::defaultStringLength(191);
}

默认目录在storage----logs----Laravel.log