How to find documents matching multiple criteria

Question

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\', wei         


        

Answer 1

Another way to solve same problem is using aggregation:

// To print results
    Block printBlock = new Block() {
        @Override
        public void apply(final Document document) {
            System.out.println(document.toJson());
        }
    };    

// get  db connection and collection 
MongoDatabase db= mongoClient.getDatabase("dbname");
    MongoCollection collection= database.getCollection("collectionname");

collection.aggregate(Arrays.asList(Aggregates.match(Filters.eq("key1", "value1")),
            Aggregates.match(Filters.eq("key2", "value2")),
            Aggregates.match(Filters.eq("key3", "value3")))).forEach(printBlock);

For more details please refer the v 3.4 mongo Aggregation documentation.

http://mongodb.github.io/mongo-java-driver/3.4/driver/tutorials/aggregation/