code: private boolean isValidateProperties() {
          return properties != null &&
                  properties.containsKey(DB_USERNAME) &&
                  properties.containsKey(DB_PASSWORD) &&
                  (properties.containsKey(DB_NAME) || properties.containsKey(JDBC_CONNECTION_STRING));
      }
docs: This function will check if the required minimum
  properties are set for database connection and exporting
  @return bool