} else {
				writer.WriteString("(NULL)")
			}
		case interface{ getInstance() *DB }:
			cv := v.getInstance()

			subdb := cv.Session(&Session{Logger: logger.Discard, DryRun: true}).getInstance()
			if cv.Statement.SQL.Len() > 0 {
				var (
					vars = subdb.Statement.Vars
					sql  = cv.Statement.SQL.String()
				)

				subdb.Statement.Vars = make([]interface{}, 0, len(vars))

	if err != nil {
		return err
	}

	cfReader := bytes.NewReader(rd)

	cv := config.ServerConfigVersion{}
	if err = yaml.Unmarshal(rd, &cv); err != nil {
		return err
	}

	switch cv.Version {
	case "v1", "v2":
	default:
		return fmt.Errorf("unexpected version: %s", cv.Version)
	}

	cfCommon := config.ServerConfigCommon{}
	if err = yaml.Unmarshal(rd, &cfCommon); err != nil {

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