How do you add elements to a set with DataStax QueryBuilder? - cassandra

Question

I have a table whose column types are
text, bigint, set<text>
I'm trying to update a single row and add an element to the set using QueryBuilder.
The code that overwrites the existing set looks like this (note this is scala):
val query = QueryBuilder.update("twitter", "tweets")
.`with`(QueryBuilder.set("sinceid", update.sinceID))
.and(QueryBuilder.set("tweets", setAsJavaSet(update.tweets)))
.where(QueryBuilder.eq("handle", update.handle))
I was able to find the actual CQL for adding an element to a set which is:
UPDATE users
SET emails = emails + {'fb#friendsofmordor.org'} WHERE user_id = 'frodo';
But could not find an example using QueryBuilder.
Based off of the CQL I also tried:
.and(QueryBuilder.set("tweets", "tweets"+{setAsJavaSet(update.tweets)}))
But it did not work. Thanks in advance

Answer 1

Use add (add one element at a time) or addAll (more than one any number of element at a time) method to add to a set.

Answer 2

To extend Ananth's answer:
QueryBuilder.add does not support BindMarker. To use BindMarker while adding in set, it is required to use QueryBuilder.addAll only.*
*Just a note, Collections.singleton may come in handy in this regard.

Answer 3

Using #Ananth and #sazzad answers, the code below works:
Session cassandraSession;
UUID uuid;
Long value;
Statement queryAddToSet = QueryBuilder
.update("tableName")
.with(QueryBuilder.addAll("setFieldName", QueryBuilder.bindMarker()))
.where(QueryBuilder.eq("whereFieldName", QueryBuilder.bindMarker()));
PreparedStatement preparedQuery = cassandraSession.prepare(queryAddToSet);
BoundStatement boundQuery = preparedQuery.bind();
boundQuery
.setUUID("whereFieldName", uuid)
.setSet("setFieldName", Collections.singleton(value));
session.execute(boundQuery);