Cassandra不使用CQL更新数据，而是使用mutator来更新数据

Keyspace fKeyspace = HFactory.createKeyspace(KEYSPACE, fCluster);

// Update with CQL
CqlQuery<String,String,String> cqlQuery =
   new CqlQuery<String,String,String>(fKeyspace, fStringS, fStringS, fStringS);
cqlQuery.setQuery(
    \"INSERT INTO Fahrer (KEY, \'first\') VALUES(\'fahrer1\', \'FirstnameUpdated\')\");
QueryResult<CqlRows<String,String,String>> result = cqlQuery.execute();

// Update with mutator
Mutator<String> mutator = HFactory.createMutator(fKeyspace, fStringS);
MutationResult mr = mutator.insert(\"fahrer2\", \"Fahrer\",
   HFactory.createStringColumn(\"first\", \"SecondUpdated\"));