ghostbody
commented
8 years ago HINT: Three-tier architecture (三层构架)
You will find it very hard to start up, here is an optional design idea.
Three-tier architecture is a client–server software architecture pattern in which the user interface (presentation), functional process logic ("business rules"), computer data storage and data access are developed and maintained as independent modules, most often on separate platforms.[3] It was developed by John J. Donovan in Open Environment Corporation (OEC), a tools company he founded in Cambridge, Massachusetts.
Apart from the usual advantages of modular software with well-defined interfaces, the three-tier architecture is intended to allow any of the three tiers to be upgraded or replaced independently in response to changes in requirements or technology. For example, a change of operating system in the presentation tier would only affect the user interface code.
Typically, the user interface runs on a desktop PC or workstation and uses a standard graphical user interface, functional process logic that may consist of one or more separate modules running on a workstation or application server, and an RDBMS on a database server or mainframe that contains the computer data storage logic. The middle tier may be multitiered itself (in which case the overall architecture is called an "n-tier architecture").
Three-tier architecture:
From wikipedia
Presentation tier (表示层) This is the topmost level of the application. The presentation tier displays information related to such services as browsing merchandise, purchasing and shopping cart contents. It communicates with other tiers by which it puts out the results to the browser/client tier and all other tiers in the network. (In simple terms it is a layer which users can access directly such as a web page, or an operating systems GUI)
Application tier (business logic, logic tier, or middle tier) (应用层或业务逻辑层) The logical tier is pulled out from the presentation tier and, as its own layer, it controls an application’s functionality by performing detailed processing.
Data tier (底层数据访问层) The data tier includes the data persistence mechanisms (database servers, file shares, etc.) and the data access layer that encapsulates the persistence mechanisms and exposes the data. The data access layer should provide an API to the application tier that exposes methods of managing the stored data without exposing or creating dependencies on the data storage mechanisms. Avoiding dependencies on the storage mechanisms allows for updates or changes without the application tier clients being affected by or even aware of the change. As with the separation of any tier, there are costs for implementation and often costs to performance in exchange for improved scalability and maintainability.
1：数据访问层：主要是对非原始数据（数据库或者文本文件等存放数据的形式）的操作层，而不是指原始数据，也就是说，是对数据的操作，而不是数据库，具体为业务逻辑层或表示层提供数据服务。在我们的项目中，数据访问应该是对数据文件的访问。
底层设计数据的读写，主要是文件读写操作。
请参考c语言文件读写章节。
思考问题： 1.如何存储信息？需要什么格式？ 2.如何根据已有信息，读取信息？ 3.如何根据已有信息，修改信息？
2：业务逻辑层：主要是针对具体的问题的操作，也可以理解成对数据层的操作，对数据业务逻辑处理，如果说数据层是积木，那逻辑层就是对这些积木的搭建。逻辑层主要解决需求中各个功能模块的逻辑问题，如查询成绩等。
3：界面层：在我们的项目中主要表现为CLI-UI（命令行界面）。你需要有一个完整的前端来提示用户来跟你进行交互。 类似下图系统：
有能力的同学可以实现GUI
sugerpocket
Chenxr1997
C Programming : Course Project
Update History
2015/12/9 22:30 Update deadline, a day ahead. 2015/12/9 22:54 Update Presentation, add a presentation for framework discuss 2015/12/11 12:00 Simplify the project requirement
Abstract
Many basically and widely used system are using C language because it's fast and more closed to the underlying of the computer structure. We are going to build a system as a real world project to understand the system design as well as a system implement.
Modeling is very important in process oriented programming. You are going to design the system yourself and design a good file structure with .h files and .c files. And also you should design good function prototypes and make clear the usage of each part.
What's more is that you should implement the functions for the complete logic.
We are going to build a student management system.
Targets
Develop Environment
windows: commandline or DEV cpp ubuntu linux: command line (optional bonus) ubuntu linux using command line and makefile (optional bonus)
使用linux开发可以加分，期末考试很可能使用linux系统。 另外，ftp上有相关虚拟机和镜像文件下载，以及安装教程，入门教程等。
Requirements
Introduction
Now, you are the system designer for our student grading system. And the our course need the following functions, you job is to implement the system demands.
1. Append Records:
You can insert a grade record into the system. The record include the several properties studentID, studentName, studentClass, studentGrade. You can also insert a number of this kind of records at the same time.
2. Delete Records:
You can delete a Record from the system by a studentID, a studentName or a wholeClass, a range of grade. You can also delete a number of this kind of records at the same time.
3. Modify Records:
You can modify the records. For example, I can change a student's name, a student's class or a student's grade. You can also modify a number of this kind of records at the same time.
4. Querying Records:
You can query some students that meets a setting condition. For example, query the students whose grade is less than 60 in a given class. You can also get the max grade, the average grade, the number of students who's grade is greater than 90.
5. Extended Functions:
You can extend the system with other functions (鼓励添加其他功能).
For example, you can use function functional programming. It means that you are supposed to use function pointers to role as filters to meet the requirements more easily. We have note functional programming in optional project 1.
For example:
Other Requirements:
Designing Style:
You can not defined useless or meaningless functions. And you can not put all project logic in one file(very bad) or put all logic in a main fuction(very very bad). How to design good function prototypes and how to divide into several files is very important and this will be the most important part for grading.
Coding Style:
Coding style is very important for you. The style rules including google style are required. What's more, you should have good comments with your code.
File Method:
Maybe you will us File IO operation, you can use your own data format. Json or CVS is recommended.
Report Template:
Abstract
Make a brief introduction for your project.
User Documentation
Statements about how to run the program. How to use this system.
Project Structure
Statements about your project structure, i.e. your function interfaces and file structure.
Design Thinking && Design Process
Statements about how you think about the project, i.e. how to divided the project(big question) into smaller questions. Statements about your details of your project design, i.e. how to implement the structure of your system.
Important Algorithm and Data Structure
Some important algorithm and data structure you use should be mentioned. And draw flowchart or write Pseudo code for them.
Testing
Statements about how you test the system.
Conclusion
Personal summary about this project.
Persentation Week 13
We will ask some students to discuss about how to build a framework for the system on Dec 14th 2015.
Presentation Final
We will have a presentation time on January 4th 2016 in the lab class. There will be randomly selected students need to do the presentation.
Deadline:
Dec 31st 2015 18:00pay attention, one day ahead deadlineDec 30th 2015 18:00Dec 30th 2015 21:00 And have a good time on new year's eve.Submit
Submit to the course ftp
ftp://172.18.182.75
username：c_and_cpp password：c_and_cpp
filename : 13331314_叶嘉祺_CourseProject.zip