How do i add another value to an array in an existing MongoDB document using Java?

Question

This is my current code

Document bitcoin = new Document("Currency", "Bitcoin").append("Values", Arrays.asList());
//bitCoinCollection.insertOne(bitcoin);

for(int i = 0; i<100;i++){
    BasicDBObject setNewFieldQuery = new BasicDBObject()
                    .append("$set", new BasicDBObject().append("value", 100));
    mongoClient.getDatabase("Binance").getCollection("Binance")
               .updateOne(new BasicDBObject().append("_id", "tjena"), setNewFieldQuery);
}

It doesnt add any values to the excisting arraylist... is there a way to add it to an excisting arraylist in a document? Thanks in advance

Does this answer your question? Adding values to an Array in MongoDB with Java — Dmitry Pisklov
– Dmitry Pisklov, Commented Mar 16, 2020 at 20:01

prasad_ · Accepted Answer · 2020-03-17 01:47:36Z

0

For this sample collection of one document with an array field using MongoDB Java driver:

{ _id: 1, fruits: [ "orange", "banana" ] }

The following Java code adds one new element to the fruits array:

Bson update = push("fruits", "guava");
Bson filter = eq("_id", new Integer(1));
UpdateResult result = collection.updateOne(filter, update);

To add multiple elements all at once from a List collection:

Bson update = pushEach("fruits", Arrays.asList("grape", "apple", "peach"));
Bson filter = eq("_id", new Integer(1));
UpdateResult result = collection.updateOne(filter, update);

answered Mar 17, 2020 at 1:47

prasad_

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