//业务层/服务层--实现功能的业务逻辑 ? @Service public class DepartmentService { @Autowired private DepartmentMapper mapper; public int insert(DepartmentModel model) { return mapper.insert(model); } public int delete(DepartmentModel model) { return mapper.delete(model); } public int update(DepartmentModel model) { return mapper.update(model); } public DepartmentModel selectModel(DepartmentModel model){ return mapper.selectModel(model); } public List<DepartmentModel> selectList(DepartmentModel model){ return mapper.selectList(model); } }