protected function register_in() { if (!empty($this->columns)) { $col = ',' . data_use::format_columns($this->columns); } if (!empty($this->values)) { $val = ',' . data_use::format_values($this->values); } return sql_use::insert($this->table, "{$this->usr_col},{$this->psw_col}{$col}", "'{$this->usr}','{$this->psw}'{$val}"); }