用C++做的微型数据库，其中应用继承和派生，生成学生，教师，职工，在校研究生，兼职教师的类，可进行插入，修改和删除-do with the micro-C database, application of inheritance and derived generate students, teachers, workers, and in graduate school, the type of part-time teachers, can be inserted, modified, and deleted