code: private DBCursor parseAndScroll(String jsonClause, String collectionName) throws JSONParseException
      {
          BasicDBObject clause = (BasicDBObject) JSON.parse(jsonClause);
          DBCursor cursor = mongoDb.getCollection(collectionName).find(clause);
          return cursor;
      }
docs: Parses the and scroll.
  
  @param jsonClause
  the json clause
  @param collectionName
  the collection name
  @return the DB cursor
  @throws JSONParseException
  the JSON parse exception