my question is whether hibernate can provide some feature something like locking mechanism in which if we select one record from the database it will block the record by further accessing it and unless that guy modifies it and save that record or release it will remail blocked.

scenario would be something like system access a record showing it to the user. the user is playing with the data in the presentation layer. Unless he clicks save button and hibernate session saves it other users/sessions will not be able to select the records even.

There is a chapter about pessimistic locking in the documentation. Hibernate doesn't implement this on it's own but falls back to whatever the underlying database supports. Read more here:

http://www.hibernate.org/hib_docs/v3/re ... cking.html