code: func (e *hdbError) Error() string {
  	if e.stmtNo != -1 {
  		return fmt.Sprintf("SQL %s %d - %s (statement no: %d)", e.errorLevel, e.errorCode, e.errorText, e.stmtNo)
  	}
  	return fmt.Sprintf("SQL %s %d - %s", e.errorLevel, e.errorCode, e.errorText)
  }
docs: // Error implements the Error interface.