// 可以用这个助手函数打印
  function getSql ()
    {
        app(‘db‘)->listen(function ($sql) {
            $singleSql = $sql->sql;
            if ($sql->bindings) {
                foreach ($sql->bindings as $replace) {
                    $value = is_numeric($replace) ? $replace : "‘" . $replace . "‘";
                    $singleSql = preg_replace(‘/\?/‘, $value, $singleSql, 1);
                }
            }
            dump($singleSql);
        });
    }