can anyone help me understand the bidirectional association in a many-to-one relationship?

I have an employee who works at a division (many employees work at A division)

I want to map the FK of divisionID to the employee:



now in division I want to have a set of employees who work there:



I got this structure from a hibernate book and I wanted to make sure that certain things happen.

Lets say I delete an employee, will it delete it from the set of employees in the divisions table?

Lets say I change where an employee works, will it delete it from the set of employees in the division table and update the appropriate division's set?

Let's say I do the same things as above but from the Division's set will it be updated in the employee table?

Any help would be great. I haevn't implemented it yet so sorry if this is not very specific.

opps in the Divisions mapping

<key column = "DIVISION_ID"/>