i have the Following HQL:
String hql = \"UPDATE Buchung as b \" + \"set STORNO = :Storno \" + \"where ID = :BuchungID\";
HQL is no different than SQL in this case. Just use comma to separate columns:
String hql = "UPDATE Buchung as b set " + "STORNO = :Storno," + "NAME = :Name " + ...... "where ID = :BuchungID";