I have 2 columns in a table ,ADD_DATE and UPDATE_DATE.
While doing saveOrUpdate(hibernate),if it is the first time it should populate the ADD_DATE and next update onwards
it should populate UPDATE_DATE.
How could it be done without querying the database(i.e in hibernate Mapping level)??

Here's one option:
- create a constructor that sets the Date addDate to the date/time you want
- in your saveOrUpdate method of your dao, set the updateDate with the date/time you want.
OR
- in your saveOrUpdate method of your dao, check if the addDate is set and if not set it otherwise set the updateDate.