public function getInsert()
  {
    DB::insert('INSERT INTO articles (title, body)VALUE(?, ?)', ['learn laravel', 'balablalabalabla']);
  }

  public function getArticles(){
    $articles = DB::select('SELECT * FROM articles WHERE title=:title', ['title' => 'learn laravel']);
    foreach ($articles as $article){
      echo "<p>$article->id</p>";
      echo "<p>$article->title</p>";
      echo "<p>$article->body</p>";
    }
  }

  public function getUpdate()
  {
    $affected = DB::update('UPDATE articles SET title=:title,body=:body WHERE id=:id',['title' => 'laravel database', 'body' => 'balabala', 'id' => 1]);
    echo $affected;
  }

  public function getDelete()
  {
    $affected = DB::delete('DELETE FROM articles WHERE id=:id', ['id' => 2]);
    echo $affected;
  }

  public function getDrop()
  {
    DB::statement('DROP TABLE articles');
  }

class AppServiceProvider extends ServiceProvider
{
  /**
   * Bootstrap any application services.
   *
   * @return void
   */
  public function boot()
  {
    DB::listen(function($sql, $bindings, $time){
      // $sql   = 查詢語(yǔ)句
      // $bindings = 綁定的鍵和值 數(shù)組類型
      // 所用的時(shí)間
    });
  }
  /**
   * Register any application services.
   *
   * @return void
   */
  public function register()
  {
    //
  }
}