Return the inserted Student upon calling insert().
Return the updated Student upon calling update().
Implement getStudentByStudentId().
Return a Course object for the inserted record when CourseDAO.insert()
is called.
Return a Course object for the updated course record when update() is
called.
Merge pull request #21 from nathanshih/StudentDAOInsertUpdate

Student dao insert update
Fixed merge conflict.
Merge pull request #22 from nathanshih/CourseDAOInsertUpdate

Course dao insert update
Fixed merge conflict.