How to do Mongodb aggregation arithmetic operator in Java?

Question

In Mongodb Aggregation Framework, you have arithmetic operators like $multiply or $add and so on, I know you can do something similar to { $multiply : [ myField, 0 ] } easily in MongoDb, but how can you do it in Java? I tried new BasicDBObject("$multiply", new BasicDBObject(myField, 0))" in Java, but I got

"errmsg" : "exception: the $multiply operator does not accept an object as an operand".

So I wonder if you can do the same thing in Java?

Thanks!!

Miguel Cartagena · Accepted Answer · 2013-07-22 15:26:46Z

2

Note that the value of $multiply operator should be an array not an object. So, in Java the code will be:

BasicDBList args  = new BasicDBList();
args.add(myField);
args.add(0);

new BasicDBObject("$multiply", args)

answered Jul 22, 2013 at 15:26

Miguel Cartagena

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