在主表（Appointment）里面private+副表的对象
private Department（副表） depa;
private User（副表） u;
然后source set get
再在主表service层里面
@Autowired
private AppointmentMapper appointmentMapper;
@Autowired
private DepartmentMapper departmentMapper;
@Autowired
private UserMapper userMapper;
//查询全部事件
public List<Appointment> getallapplist(){
for (Appointment ap : appointmentMapper.getlist()) {
ap.setDepa(departmentMapper.selectByPrimaryKey((Integer.valueOf(ap.getDepartment()))));
ap.setU(userMapper.selectByPrimaryKey((Integer.valueOf(ap.getUser()))));
}
return appointmentMapper.getlist();
}
