How do I query for checking two string type fields

Hello,

      I have created project using jsp, servlets in netbeans6.9. I am able to store whole entity values as well as retrieve all. But when i  write query as given below its showing error :-> com.google.appengine.api.datastore.EntityNotFoundException: No entity was found matching the key: firstname("Smita")

my code is here,

String uname="Smita";

DatastoreService ds = DatastoreServiceFactory.getDatastoreService();

Key key = KeyFactory.createKey("firstname", uname);

Entity ent = ds.get(key);

plz help me, i wants to check two fields firstname and lastname (need query as in mysql   select * from logininfo where firstname='smita' and lastname='sharma');

Thanks......

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