जावा में $cond सहित DBObject में एकत्रीकरण चालू करें

आप मोंगो जावा 2.13 संस्करण के लिए नीचे दी गई एकत्रीकरण क्वेरी का उपयोग कर सकते हैं। मैंने कुछ कार्यों को सरल बना दिया है।

 List<DBObject> aggregates = Arrays.asList(new BasicDBObject("$project", new BasicDBObject("dt", "$dt").
            append("mc", "$mc").
            append("uplift", "$uplift").
            append("baseAvg", "$baseAvg").
            append("baseUp", new BasicDBObject("$add", Arrays.<Object>asList("$uplift", "$baseAvg"))).
            append("share", new BasicDBObject("$cond", Arrays.<Object>asList(new BasicDBObject("$eq", Arrays.<Object>asList("$baseAvg", 0)),
                    0, new BasicDBObject("$divide",  Arrays.<Object>asList("$uplift", "$baseAvg")))))));

3.x संस्करण के लिए आप नीचे एकत्रीकरण का उपयोग कर सकते हैं।

 MongoClient mongoClient = new MongoClient();
 MongoDatabase db = mongoClient.getDatabase("db");
 MongoCollection<Document> collection = db.getCollection("collection");
 Bson aggregates = Aggregates.project(Projections.fields(Projections.include("dt", "mc", "uplift","baseAvg"),
               new Document("baseUp", new Document("$add", Arrays.<Object>asList("$uplift", "$baseAvg"))),
               new Document("share", new Document("$cond", Arrays.<Object>asList(new Document("$eq", Arrays.<Object>asList("$baseAvg", 0)),
                                        0, new Document("$divide",  Arrays.<Object>asList("$uplift", "$baseAvg")))))));
 List<Document> results = collection.aggregate(Arrays.asList(aggregates)).into(new ArrayList<>());