docs: public KeyArea setupKey(int iKeyArea)
      {
          KeyArea keyArea = null;
          if (iKeyArea == DBConstants.MAIN_KEY_FIELD)
          {
              keyArea = this.makeIndex(DBConstants.UNIQUE, DBConstants.PRIMARY_KEY);
              keyArea.addKeyField(DBConstants.MAIN_FIELD, DBConstants.ASCENDING);
          }
          return keyArea;
      }