Examples of com.mongodb.DBCursor

com.mongodb.DBCursor
An iterator over database results. Doing a find() query on a collection returns a DBCursor thus
```
 DBCursor cursor = collection.find( query ); if( cursor.hasNext() ) DBObject obj = cursor.next(); 
```
Warning: Calling toArray or length on a DBCursor will irrevocably turn it into an array. This means that, if the cursor was iterating over ten million results (which it was lazily fetching from the database), suddenly there will be a ten-million element array in memory. Before converting to an array, make sure that there are a reasonable number of results using skip() and limit().
For example, to get an array of the 1000-1100th elements of a cursor, use
```
 List obj = collection.find( query ).skip( 1000 ).limit( 100 ).toArray(); 
```
@dochub cursors


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("publishedTimestamp", 1);


      //DBCursor cursor = collection.find(query).sort(byTimestamp);
      DBCursor cursor = collection.find(qryObj).sort(byTimestamp).skip(offset).limit(limit);


      List<String> ids = new ArrayList<String>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        String messageGuid = (String) next.get("guid");
        ids.add(messageGuid);;
      }
      return ids;
    }

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      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("publishedTimestamp", 1);


      //DBCursor cursor = collection.find(query).sort(byTimestamp);
      DBCursor cursor = collection.find(qryObj).sort(byTimestamp).skip(offset).limit(limit);


      List<String> ids = new ArrayList<String>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        String messageGuid = (String) next.get("guid");
        ids.add(messageGuid);
      }
      logger.info("Found "+ids.size()+" messages for responder: "+responderId+", topic: "+topicId+" that have no processing state annotation");
      return ids;

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      query.put("timestamp", new BasicDBObject("$gt", withinMs));


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("timestamp", 1);


      DBCursor cursor = collection.find(query).sort(byTimestamp);
      List<ProcessStartLogItem> beans = new ArrayList<ProcessStartLogItem>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        beans.add(deserialise(next, ProcessStartLogItem.class));
      }
      return beans;
    }
    catch(Exception e)

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      query.put("timestamp", new BasicDBObject("$gt", withinMs));


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("timestamp", 1);


      DBCursor cursor = collection.find(query).sort(byTimestamp);
      List<ProcessStartLogItem> beans = new ArrayList<ProcessStartLogItem>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        beans.add(deserialise(next, ProcessStartLogItem.class));
      }
      return beans;
    }
    catch(Exception e)

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  {
    try
    {
//      BasicDBObject query = new BasicDBObject();


      DBCursor cursor = collection.find();//.skip(offset).limit(limit);
      List<ResponderInfo> docs = new ArrayList<ResponderInfo>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        docs.add(deserialise(next, ResponderInfo.class));
      }
      return docs;
    }
    catch(Exception e)

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          + ", range: "+offset+" -> "+limit);
      //BasicDBObject query = new BasicDBObject();
      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("timestamp", 1);


      DBCursor cursor = collection.find().sort(byTimestamp).skip(offset).limit(limit);
      List<ProcessStartLogItem> beans = new ArrayList<ProcessStartLogItem>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        beans.add(deserialise(next, ProcessStartLogItem.class));
      }
      return beans;
    }
    catch(Exception e)

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      query.put("responderGuid", responderGuid);


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("timestamp", 1);


      DBCursor cursor = collection.find(query).sort(byTimestamp).skip(offset).limit(limit);
      List<ProcessStartLogItem> beans = new ArrayList<ProcessStartLogItem>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        beans.add(deserialise(next, ProcessStartLogItem.class));
      }
      return beans;
    }
    catch(Exception e)

View Full Code Here


    // no arguments, will ask DB what the last updated Id was (checking persistent storage)
    private DBCursor initializeCursor() {
        Object lastVal = tailTracking.lastVal;
        // lastVal can be null if we are initializing and there is no persistence enabled
        DBCursor answer;
        if (lastVal == null) {
            answer = dbCol.find().addOption(Bytes.QUERYOPTION_TAILABLE).addOption(Bytes.QUERYOPTION_AWAITDATA);
        } else {
            DBObject queryObj = new BasicDBObject(tailTracking.getIncreasingFieldName(), new BasicDBObject("$gt", lastVal));
            answer = dbCol.find(queryObj).addOption(Bytes.QUERYOPTION_TAILABLE).addOption(Bytes.QUERYOPTION_AWAITDATA);

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        // get the batch size and number to skip
        Integer batchSize = exchange.getIn().getHeader(MongoDbConstants.BATCH_SIZE, Integer.class);
        Integer numToSkip = exchange.getIn().getHeader(MongoDbConstants.NUM_TO_SKIP, Integer.class);
        Integer limit = exchange.getIn().getHeader(MongoDbConstants.LIMIT, Integer.class);
        DBObject sortBy = exchange.getIn().getHeader(MongoDbConstants.SORT_BY, DBObject.class);
        DBCursor ret = null;
        try {  
            if (query == null && fieldFilter == null) {
                ret = dbCol.find(new BasicDBObject());
            } else if (fieldFilter == null) {
                ret = dbCol.find(query);
            } else {
                ret = dbCol.find(query, fieldFilter);
            }
            
            if (sortBy != null) {
                ret.sort(sortBy);
            }
            
            if (batchSize != null) {
                ret.batchSize(batchSize.intValue());
            }
            
            if (numToSkip != null) {
                ret.skip(numToSkip.intValue());
            }
    
            if (limit != null) {
                ret.limit(limit.intValue());
            }
            
            Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.findAll);
            resultMessage.setBody(ret.toArray());
            resultMessage.setHeader(MongoDbConstants.RESULT_TOTAL_SIZE, ret.count());
            resultMessage.setHeader(MongoDbConstants.RESULT_PAGE_SIZE, ret.size());
            
        } catch (Exception e) {
            // rethrow the exception
            throw e;
        } finally {
            // make sure the cursor is closed
            if (ret != null) {
                ret.close();
            }
        }
        
    }

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            long startTime, long endTime) throws ManifoldCFException, ServiceInterruption {
        getSession();
        DBCollection fsFiles = session.getCollection(
                bucket + GridFSConstants.COLLECTION_SEPERATOR + GridFSConstants.FILES_COLLECTION_NAME
        );
        DBCursor dnc = fsFiles.find();
        while (dnc.hasNext()) {
            DBObject dbo = dnc.next();
            String _id = dbo.get("_id").toString();
            activities.addSeedDocument(_id);
            if (Logging.connectors.isDebugEnabled()) {
                Logging.connectors.debug("GridFS: Document _id = " + _id + " added to queue");
            }

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