【MFC】学生成绩管理系统(期末项目)

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课程设计具体实现

数据库设计

E-R图

在这里插入图片描述

关系模式

教师(工号，姓名，学院) 主键(工号)
学生(学号，姓名，性别，年龄，班级，专业，学分) 主键(学号)
课程(课程编号，教师编号，课程名称，课程学分) 主键(课程编号) 外键(教师编号)
选课(学号，课程编号，分数) 主键(学号，课程编号) 外键(学号，课程编号)

表的结构

create table Adminuser(username int unsigned primary key not null auto_increment,password varchar(16) default '123456'
);
create table Studentuser(username int unsigned primary key not null auto_increment,password varchar(16) default '123456'
);
create table teacheruser(username int unsigned primary key not null auto_increment,password varchar(16) default '123456'
);create table teacher(job_num  int unsigned  primary key auto_increment,t_name  varchar(20) not null,college varchar(20) not null
);
create table student(stu_num  int unsigned  primary key auto_increment,stu_name  varchar(20) not null,sex varchar(1) not null,age tinyint unsigned not null,class   varchar(20) not null,major   varchar(20) not null,credit int(5) unsigned not null default 0
);
create table course(c_num  int unsigned  primary key auto_increment,t_num  int unsigned not null,c_name  varchar(20) not null,c_credit   tinyint unsigned not null,constraint c_t_num foreign key(t_num) references teacher(job_num)
);
create table select_course(stu_num  int unsigned ,c_num   int unsigned not null,s_score  float(5,2) not null,primary key(stu_num,c_num),foreign key(stu_num) references student(stu_num),foreign key(c_num) references course(c_num)
);

函数和存储过程

--统计及格人数
delimiter $
CREATE PROCEDURE passnumber(in c_id int unsigned)begin
select sum(case when s_score>=60 then 1 else 0 end) as 及格人数,
sum(case when s_score<60 then 1 else 0 end) as 不及格人数
from score where c_num=c_id;end $
delimiter ;