Examples of DBCursor

com.massivecraft.mcore.xlib.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
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
com.sun.sgs.service.store.db.DbCursor
The interface to a cursor for iterating over the contents of a database. A newly created cursor has no current key or value. Cursors are associated with a single transaction, and must be created and closed within that single transaction. Cursors must not be used after the {@link #close close} methodis called. Cursor implementations are not required to be synchronized.

Examples of com.mongodb.DBCursor

        // 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());
        } finally {
            // make sure the cursor is closed
            if (ret != null) {
                ret.close();
            }
        }


    }

View Full Code Here

Examples of com.mongodb.DBCursor


                    QueryBuilder query = QueryBuilder.start(Document.ID)
                            .in(sameLevelNodes.keySet());


                    // Fetch lastRev and modCount for each such nodes
                    DBCursor cursor = nodes.find(query.get(), keys);
                    LOG.debug(
                            "Checking for changed nodes at level {} with {} paths",
                            tn.level(), sameLevelNodes.size());
                    result.queryCount++;
                    for (DBObject obj : cursor) {

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Examples of com.mongodb.DBCursor

            queryBuilder.greaterThanEquals(startValue);
        }
        DBObject query = queryBuilder.get();
        long start = start();
        try {
            DBCursor cursor = dbCollection.find(query).sort(BY_ID_ASC);
            List<T> list = new ArrayList<T>();
            for (int i = 0; i < limit && cursor.hasNext(); i++) {
                DBObject o = cursor.next();
                T doc = convertFromDBObject(collection, o);
                if (collection == Collection.NODES && doc != null) {
                    doc.seal();
                    String id = doc.getId();
                    Lock lock = getAndLock(id);

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Examples of com.mongodb.DBCursor

            // Fetch only the lastRev map and id
            final BasicDBObject keys = new BasicDBObject(Document.ID, 1);
            keys.put(Document.MOD_COUNT, 1);


            // Fetch lastRev for each such node
            DBCursor cursor = nodes.find(query.get(), keys);
            result.queryCount++;
            for (DBObject obj : cursor) {
                result.cacheEntriesProcessedCount++;
                String id = (String) obj.get(Document.ID);
                Number modCount = (Number) obj.get(Document.MOD_COUNT);

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Examples of com.mongodb.DBCursor

        queryBuilder.and("_id").greaterThan(parent + "/");
        queryBuilder.and("_id").lessThanEquals(parent + "0");
        DBObject query = queryBuilder.get();
        BasicDBObject keys = new BasicDBObject();
        keys.put("_id", 1);
        DBCursor cursor = nodes.find(query, keys);
        int count = 0;
        log("Query plan: " + cursor.explain());
        long time = System.currentTimeMillis();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            // dummy read operation (to ensure we did get the data)
            obj.get("_id");
            count++;
            // log(" read " + obj);
        }

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Examples of com.mongodb.DBCursor


  private MongoDBResultTupleIterable getResultsCursor() {
    EntityKeyMetadata keyMetaData = getKeyMetaData( entityType );
    DBCollection collection = provider.getDatabase().getCollection( keyMetaData.getTable() );


    DBCursor cursor = isProjection() ? collection.find( query, projections ) : collection.find( query );


    return new MongoDBResultTupleIterable( cursor, keyMetaData );
  }

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Examples of com.mongodb.DBCursor

            queryBuilder.greaterThanEquals(startValue);
        }
        DBObject query = queryBuilder.get();
        long start = start();
        try {
            DBCursor cursor = dbCollection.find(query);
            List<T> list = new ArrayList<T>();
            for (int i = 0; i < limit && cursor.hasNext(); i++) {
                DBObject o = cursor.next();
                T doc = convertFromDBObject(collection, o);
                if (collection == Collection.NODES && doc != null) {
                    doc.seal();
                    nodesCache.put(doc.getId(), (NodeDocument) doc);
                }

View Full Code Here

Examples of com.mongodb.DBCursor

        queryBuilder.and("_id").greaterThan(parent + "/");
        queryBuilder.and("_id").lessThanEquals(parent + "0");
        DBObject query = queryBuilder.get();
        BasicDBObject keys = new BasicDBObject();
        keys.put("_id", 1);
        DBCursor cursor = nodes.find(query, keys);
        int count = 0;
        log("Query plan: " + cursor.explain());
        long time = System.currentTimeMillis();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            // dummy read operation (to ensure we did get the data)
            obj.get("_id");
            count++;
            // log(" read " + obj);
        }

View Full Code Here

Examples of com.mongodb.DBCursor

    query.put(MongoDbDeltaStoreUtil.FIELD_WAVE_ID, waveId.serialise());


    DBObject projection = new BasicDBObject();
    projection.put(MongoDbDeltaStoreUtil.FIELD_WAVELET_ID, 1);


    DBCursor cursor = null;


    try {
      cursor = getDeltaDbCollection().find(query, projection);
    } catch (MongoException e) {
      throw new PersistenceException(e);
    }




    if (cursor == null || !cursor.hasNext()) {
      return ImmutableSet.of();
    } else {
      ImmutableSet.Builder<WaveletId> builder = ImmutableSet.builder();
      for (DBObject waveletIdDBObject : cursor) {
        builder.add(WaveletId.deserialise((String) waveletIdDBObject

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Examples of com.mongodb.DBCursor

    }


    @Override
    public Iterator<StateReader> instancesOf(final ObjectSpecId objectSpecId) {
        final DBCollection instances = db.getCollection(objectSpecId.asString());
        final DBCursor cursor = instances.find();
        LOG.info("searching for instances of: " + objectSpecId);
        return new Iterator<StateReader>() {
            @Override
            public boolean hasNext() {
                return cursor.hasNext();
            }


            @Override
            public StateReader next() {
                return new MongoStateReader(cursor.next());
            }


            @Override
            public void remove() {
                throw new NoSqlStoreException("Can't remove elements");

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