أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
if the identifier doesn’t exist SAVE method will work and UPDATE will not work and the identifier does exist then UPDATE method will work..
Please follow this link:-
http://www.javabeat.net/difference-between-hibernates-saveupdate-and-saveorupdate-methods/