1 Reply Latest reply on Feb 3, 2013 11:32 AM by Adam Warski

    What are purpose association mapping in hibernate?

    BRN BRN Newbie

      Now let us consider an example..

      Employee -- Class
      empno
      emp_name
      dept_id

      Dept---Class
      dept_id
      dept_name
      dept_location

      so 1-to-Many relationship occurred in the above case.
      Now i am stuck up in understanding the concept.
      When is this mapping considered and go the following questions
      1) Is this mapping considered only while fetching the data from database?
      2) Is this mapping considered only while storing data to database?
      3) Or this is considered for both 1) and 2)
      4) Why mapping is used?
      5) How to decide which mapping to be used for eg lets consider One-to-Many relationship {Unidirectional or Bidirectional}?

      Can you explain a little more with the above example