about use batch_mutate,can some one provide a example,i am using FluentCassandra

[Medcl~]

now i am confused about using the operation batch_mutate,when i follow the code 
from 
here:http://stackoverflow.com/questions/2783323/cassandra-batch-mutate/3137753#3137753
and it seems it has success inserted something,but when i use cassandra-cli to 
check it,it just return nothing,
could someone help me,please.
thx very much.