How to perform an aggregate mongo-query using json in a String?

Question

I have a string with an aggregate json query (loaded from a file) for mongodb. In robomongo, it works well. So in robomongo, I have:

db.getCollection(\'Odds\         


        

Answer 1

You are not far from the solution:

The aggregate function takes: .aggregate(List<DBObject>) But the JSON.parse you want to use lets you typecast into it, if you have a list in your query, so no Problem

String query="[....}";
List<DBObject> q= (List<DBObject>)JSON.parse(query);
Iterable<DBObject> result=new MongoClient().getDatabase("db").getCollection("coll").aggregate(q).results();`

The results can than be iterated.