For asynch it's as simple as using the executeAsync
function:
...
DatastaxConnection.getSession().executeAsync(query);
For the batch, you need to build the query (I use strings because the compiler knows how to optimize string concatenation really well):
String cql = "BEGIN BATCH "
cql += "INSERT INTO test.prepared (id, col_1) VALUES (?,?); ";
cql += "INSERT INTO test.prepared (id, col_1) VALUES (?,?); ";
cql += "APPLY BATCH; "
DatastaxConnection.getInstance();
PreparedStatement prepStatement = DatastaxConnection.getSession().prepare(cql);
prepStatement.setConsistencyLevel(ConsistencyLevel.ONE);
// this is where you need to be careful
// bind expects a comma separated list of values for all the params (?) above
// so for the above batch we need to supply 4 params:
BoundStatement query = prepStatement.bind(userId, "col1_val", userId_2, "col1_val_2");
DatastaxConnection.getSession().execute(query);
On a side note, I think your binding of the statement might look something like this, assuming you change attributes to a list of maps where each map represents an update/insert inside the batch:
BoundStatement query = prepStatement.bind(userId,
attributesList.get(0).values().toArray(new Object[attributes.size()]),
userId_2,
attributesList.get(1).values().toArray(new Object[attributes.size()]));