mongo-java

I wonder, if there is a way to check if mongoDB server is running from java driver for mongoDB? According to the tutorial, I can do Mongo m = new Mongo(); // or Mongo m = new Mongo( "localhost" , 27017 ); // and DB db = m.getDB( "mydb" ); But how to check that I can use these Mongo and DB? I see no isConnected() method in the API. db.getConnector().isOpen() returns true The only way I found is call db.getDatabaseNames() and catch MongoException. If there some more civilized approach? Gates VP if there is a way to check if mongoDB server is running from java driver for MongoDB? So if you can do

I'm trying to query a collection using operands AND'd together. I've got the shell version working: db.widgets.find({color: 'black, shape: 'round', weight: 100}) I'm unable to find the Java equivalent (using the native driver ). I've tried various things, but here is my latest attempt: // Find all black, round widgets with weight 100 List<BasicDBObject> criteria = new ArrayList<BasicDBObject>(); criteria.add(new BasicDBObject("color", "black")); criteria.add(new BasicDBObject("shape", "round")); criteria.add(new BasicDBObject("weight", 100)); DBCursor cur = widgets.find(new BasicDBObject("$and

I have a MongoDB whom store the date objects in UTC. Well, I want to perform aggregation by year,month day in a different timezone (CET). doing this, works fine for UTC: BasicDBObject group_id = new BasicDBObject("_id", new BasicDBObject("year", new BasicDBObject("$year", "$tDate")). append("month", new BasicDBObject("$month", "$tDate")). append("day", new BasicDBObject("$dayOfMonth", "$tDate")). append("customer", "$customer")); BasicDBObject groupFields = group_id. append("eventCnt", new BasicDBObject("$sum", "$eventCnt")); BasicDBObject group = new BasicDBObject("$group", groupFields); or,