C#实现学生学籍管理系统 （Mysql）

GitHub地址：https://github.com/Knock-man/studentStatusManagementSyatem

一、模块功能

设计一个用户登录界面，当用户未注册时，点击注册后跳转注册界面，注册后返回登录界面。
登录后菜单功能模块：

二、数据库设计

数据库名称:StudentStatusManagement
各实体属性
专业（专业编号，专业名称，专业描述）
班级（班级编号，班级名称，班级人数，班级描述，班主任）
学生（学生编号，学生名称，性别，年龄,学生描述）
课程（课程编号，课程学分，课程名称，课程说明）
用户（用户编号，用户名，密码）
E-R图设计

关系模式设计

专业（专业编号，专业名称，专业描述）
Major(majorId,majorName,majorExplain)

班级（班级编号，班级名称，班级人数，班级描述，班主任，专业编号）
Class(classId,className,classCount,classExplain,teacher,majorId)

学生（学生编号，学生名称，性别，年龄，，学生描述，班级编号）
Student(studentId,studentName,sex,age,studentExplain,classId)

课程（课程编号，课程学分，课程名称，课程说明）
Course(courseId,courseGrade,courseName,courseExplain)

选课（课程号，学生编号，成绩）
Choose(courseId,studentId,grade)

用户（用户编号，用户名，密码）
User(userId,userName,userPassword)

建表

#建库
CREATE DATABASE IF NOT EXISTS StudentStatusManagement;
#建专业表
CREATE TABLE IF NOT EXISTS Major(
	majorId CHAR(10) NOT NULL PRIMARY KEY,
	majorName CHAR(10),
	majorExplain CHAR(30)
)
#建课程表
CREATE TABLE IF NOT EXISTS Course(
	courseId CHAR(10) NOT NULL PRIMARY KEY,
	courseGrade CHAR(10),
	courseName CHAR(10),
	courseExplain CHAR(30)
)
#建用户表
CREATE TABLE IF NOT EXISTS USER(
	userId INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
	userName CHAR(20),
	userPassword CHAR(20)
)
#建班级表
CREATE TABLE IF NOT EXISTS Class(
	classId CHAR(10)  NOT NULL PRIMARY KEY,
	className CHAR(10),
	classCount CHAR(10),
	classExplain CHAR(30),
	teacher CHAR(10),
	majorId char(10),
	FOREIGN KEY(majorId) REFERENCES  Major(majorId)
)
#建学生表
CREATE TABLE IF NOT EXISTS Student(
	studentId char(10) NOT NULL PRIMARY KEY,
	studentName char(10), 
	sex char(10),
	age char(10),
	studentExplain char(30),
	classId char(10),
	FOREIGN KEY(classId) REFERENCES  Class(classId)
)
#建选课表 
CREATE TABLE IF NOT EXISTS Choose(
	courseId char(10) not null,
	studentId char(10) not null,
	grade char(10),
	PRIMARY KEY(courseId,studentId),
	FOREIGN KEY(courseId) REFERENCES  Course(courseId),
	FOREIGN KEY(studentId) REFERENCES  Student(studentId)
)

三、窗体设计

各窗体控件名：

用户登录：
窗体名:register
用户名：userName
密码：passWord
验证码：verification

用户注册：
窗体名：sign
用户名：userName
密码：passWord
确认密码：againPassword

主菜单：
窗体名：Menu


添加专业：
窗体名：AddProfessional
专业编号：zhuanyeId
专业名称：zhuanyeName
专业描述：describe

浏览专业：
窗体名：BrowseMajor

修改专业：
窗体名：UpdateMajor

添加课程：
窗体名：AddCourse
课程编号:courseId
课程学分：courseCredit
课程名称：courseName
课程说明：describe

浏览课程：
窗体名：BrowseCourse

添加班级：
窗体名：AddClass
班级号：classId
班级名称：className
班主任：teacher
班级人数：count
所属专业：major
说明：emplain

班级浏览：
窗体名：BrowseClass
班级号：classid


添加学生：
窗体名：AddStudent
学号：studentId
姓名：studentName
性别：sex
年龄：age
班级编号：classId

学生预览：
窗体名：BrowseStudent
学号：studentId

录入成绩：
窗体名：AddScore
学号：studentId
课程号：courseId
成绩：Score

成绩浏览：
窗体名：BrowseScore

（一）登录界面

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class register : Form
    {
   
        public register()
        {
   
            InitializeComponent();
        }
        
         
        private void button2_Click(object sender, EventArgs e)
        {
   
            this.Hide();
            sign stu = new sign();
            stu.Show();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (userName.Text=="")
            {
   
                MessageBox.Show("用户名不能为空", "用户登录", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

            }
            else if (passWord.Text == "")
            {
   
                MessageBox.Show("密码不能为空", "用户登录", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else if (verification.Text == "")
            {
   
                MessageBox.Show("验证码不能为空", "用户登录", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else if (verification.Text != label4.Text)
            {
   
                MessageBox.Show("验证码错误，请重新输入", "用户登录", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
   
                //查询数据库账户信息
                string username = userName.Text;
                string password = passWord.Text;
                string sql = "SELECT COUNT(*) FROM USER WHERE userName='" + username + "' AND userPassword = '" + password + "'; ";
                MySqlCommand com = new MySqlCommand(sql, conn);
                if (Convert.ToInt32(com.ExecuteScalar())==0)
                {
   
                    MessageBox.Show("用户名或者密码错误，请重新输入", "用户登录", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }
                else
                {
   
                    Menu stu = new Menu();
                    stu.Show();
                    this.Hide();
                }
            }
        }

        private void register_Load(object sender, EventArgs e)
        {
   
            Random rd = new Random();
            label4.Text = Convert.ToString(rd.Next(1000, 10000));
        }
    }
}

（二）注册界面

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class sign : Form
    {
   
        public sign()
        {
   
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (userName.Text == "")
            {
   
                MessageBox.Show("用户名不能为空", "用户注册", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

            }
            else if (passWord.Text == "")
            {
   
                MessageBox.Show("密码不能为空", "用户注册", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }else if (againPassword.Text == "")
            {
   
                MessageBox.Show("请再次输入密码", "用户注册", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

            }else if (passWord.Text != againPassword.Text)
            {
   
                MessageBox.Show("两次密码输入不一致", "用户注册", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
   
                string username = userName.Text;
                string password = passWord.Text;
                //账户存入数据库
                string sql = "insert into User set userName='" + username + "',userPassword='" + password + "'";
                MySqlCommand com = new MySqlCommand(sql, conn);
                com.ExecuteNonQuery();
                MessageBox.Show("注册成功", "用户注册", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.Hide();
                register stu = new register();
                stu.Show();

            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            this.Hide();
            register stu = new register();
            stu.Show();
        }

        private void sign_Load(object sender, EventArgs e)
        {
   

        }
    }
}

（三）主菜单

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace studentStatusManagementSyatem
{
   
    public partial class Menu : Form
    {
   
        public Menu()
        {
   
            InitializeComponent();
        }

        private void 添加专业ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            //打开添加专业窗口
            page.Text = "添加专业";
            AddProfessional stu = new AddProfessional();
            stu.Show();
            

        }

        private void 专业浏览ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   

            //打开浏览专业窗口
            page.Text = "专业浏览";
            BrowseMajor stu = new BrowseMajor();
            stu.Show();
        }

        private void 添加课程ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            page.Text = "添加课程";
            AddCourse stu = new AddCourse();
            stu.Show();

        }

        private void 课程浏览ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            page.Text = "课程浏览";
            BrowseCourse stu = new BrowseCourse();
            stu.Show();
        }

        private void 退出系统ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            this.Hide();
            register stu = new register();
            stu.Show();
        }

        private void 班级浏览ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            BrowseClass stu = new BrowseClass();
            stu.Show();
            page.Text = "班级浏览";
        }

        private void 添加班级ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            AddClass stu = new AddClass();
            stu.Show();
            page.Text = "添加班级";
        }

        private void 添加学生ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            page.Text = "添加学生";
            AddStudent stu = new AddStudent();
            stu.Show();

        }

        private void 学生浏览ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            page.Text = "学生预览";
            BrowseStudent stu = new BrowseStudent();
            stu.Show();
        }

        private void 录入成绩ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            page.Text = "添加成绩";
            AddScore stu = new AddScore();
            stu.Show();
        }

        private void 成绩浏览ToolStripMenuItem_Click(object sender, EventArgs e)
        {
   
            page.Text = "成绩浏览";
            BrowseScore stu = new BrowseScore();
            stu.Show();

        }

        private void Menu_Load(object sender, EventArgs e)
        {
   

        }
    }
}

（四）专业管理模块

添加专业

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class AddProfessional : Form
    {
   
       
        public AddProfessional()
        {
   
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            
            this.Hide();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (zhuanyeId.Text == "")
            {
   
                MessageBox.Show("专业编号不能为空不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }else if (zhuanyeName.Text == "")
            {
   
                MessageBox.Show("专业名称不能为空不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
   

                //数据库取数据判断专业是否存在
                string zhuanyeid = zhuanyeId.Text;
                string zhuanyename = zhuanyeName.Text;
                string miaoshu = textBox1.Text;
                string sql1 = "select count(*) from major where majorId='"+zhuanyeid+"'";
                MySqlCommand com = new MySqlCommand(sql1, conn);
                if (Convert.ToInt32(com.ExecuteScalar())>0)//专业存在
                {
   
                    MessageBox.Show("此专业已存在", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }
                else//添加进数据库
                {
   
                    string sql2 = "insert into major set majorId='" + zhuanyeid + "',majorName='" + zhuanyename + "',majorExplain='" + miaoshu + "'";
                    MySqlCommand com2 = new MySqlCommand(sql2, conn);
                    com2.ExecuteNonQuery();
                    MessageBox.Show("添加成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    this.Hide();
                }

            }
        }

        private void AddProfessional_Load(object sender, EventArgs e)
        {
   

        }
    }
}

2.浏览专业

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class BrowseMajor : Form
    {
   
        public static string t1;
        public static string t2;
        public static string t3;
        public static string[] array = new string[100];
        public static int index;
        public BrowseMajor()
        {
   
            InitializeComponent();
        }

        private void button3_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void BrowseMajor_Load(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            //获取所有专业
            
            string sql = "SELECT * FROM major";
            MySqlCommand com = new MySqlCommand(sql, conn);
            MySqlDataReader reader = com.ExecuteReader();
            listBox1.Items.Clear();
            listBox1.Items.Add(string.Format("专业编号       专业名          专业说明"));
            int i = 0;
            while (reader.Read())
            {
   
                listBox1.Items.Add(string.Format("{0,5}\t{1,10}\t{2,10}",reader[0],reader[1],reader[2]));
                array[i++] = (string)reader[0];//将编号依次存入数组
            }
            reader.Close();


        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (listBox1.SelectedIndex > 0)
            {
   
                //删除这个专业的学生
                string sql3 = "DELETE student FROM Student,Class WHERE  Student.classId=Class.classId AND Class.majorId='"+array[listBox1.SelectedIndex - 1]+"'";
                MySqlCommand comdt = new MySqlCommand(sql3, conn);
                comdt.ExecuteNonQuery();
                //先删除在这个专业的所有班级
                string sql1 = "DELETE FROM Class WHERE class.majorId='"+ array[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand comd = new MySqlCommand(sql1, conn);
                comd.ExecuteNonQuery();

                //删除专业
                #region 删除
                string sql = "DELETE FROM major WHERE majorId='" + array[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand cmd = new MySqlCommand(sql, conn);
                cmd.ExecuteNonQuery();
                #endregion
                MessageBox.Show("删除成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.Hide();
            }
            

        }
       
        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            
            if (listBox1.SelectedIndex > 0)
            {
   
                //查数据
                string sql2 = "select * from major where majorId='" + array[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand cmdd = new MySqlCommand(sql2, conn);
                MySqlDataReader reader = cmdd.ExecuteReader();
                while (reader.Read())
                {
   
                    t1 = (string)reader[0];
                    t2 = (string)reader[1];
                    t3 = (string)reader[2];
                }
                reader.Close();
                BrowseMajor.index = listBox1.SelectedIndex - 1;
                UpdateMajor stu = new UpdateMajor();
                stu.Show(this);
                this.Hide();
                
            }    
            
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class UpdateMajor : Form
    {
   
        public UpdateMajor()
        {
   
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
   
            
        }

        private void UpdateMajor_Load(object sender, EventArgs e)
        {
   
            textBox1.Text = BrowseMajor.t1;
            textBox2.Text = BrowseMajor.t2;
            textBox3.Text = BrowseMajor.t3;
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
          
            //string newt1 = textBox1.Text;
            string newt2 = textBox2.Text;
            string newt3 = textBox3.Text;
            string sql="UPDATE major SET  majorName = '"+newt2+"', majorExplain = '"+newt3+"' WHERE majorid = '"+ BrowseMajor.array[BrowseMajor.index] + "'";
            MySqlCommand com = new MySqlCommand(sql, conn);
            com.ExecuteNonQuery();
            MessageBox.Show("修改成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            this.Hide();
        }
    }
}

（五）班级管理

添加班级

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace studentStatusManagementSyatem
{
   
    public partial class AddClass : Form
    {
   
        public AddClass()
        {
   
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (classId.Text=="")
            {
   
                MessageBox.Show("班级编号不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }else if (className.Text == "")
            {
   
                MessageBox.Show("班级名称不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
   
                string banjiId = classId.Text;
                string banjiName = className.Text;
                string banzhur = teacher.Text;
                string renshu = count.Text;
                //获得专业名称
                string zhuanye = "";
                if (major.SelectedIndex != -1)
                {
   
                    zhuanye = major.SelectedItem.ToString();
                }
                else
                {
   
                    major.SelectedIndex = 0;
                }
                //获得专业id
                string zhuanyeId="";
                string sql = "select majorId from major where majorName='" + zhuanye + "'";
                MySqlCommand comt = new MySqlCommand(sql,conn);
                MySqlDataReader reader = comt.ExecuteReader();
                while (reader.Read())
                {
   
                    zhuanyeId =(string) reader[0];
                }
                reader.Close();
                MySqlCommand comm = new MySqlCommand();
                string shuoming = emplain.Text;
                string sql1 = "select count(*) from Class where ClassId='" + banjiId + "'";
                MySqlCommand com = new MySqlCommand(sql1, conn);
                if (Convert.ToInt32(com.ExecuteScalar()) > 0)//班级存在
                {
   
                    MessageBox.Show("此班级已存在", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }
                else//添加进数据库
                {
   
                    string sql2 = "insert into Class set classId='" + banjiId + "',className='" + banjiName + "',classCount='" + renshu + "',teacher='"+banzhur+"',classExplain='"+shuoming+"',majorId='"+zhuanyeId+"'";
                    MySqlCommand com2 = new MySqlCommand(sql2, conn);
                    com2.ExecuteNonQuery();
                    MessageBox.Show("添加成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    this.Hide();                 
                }

               

            }
        }

        private void AddClass_Load(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            //导入专业进集合

            MySqlCommand st = new MySqlCommand("select majorName from major", conn);
            MySqlDataReader reader1 = st.ExecuteReader();
            major.Items.Clear();
            while (reader1.Read())
            {
   
                major.Items.Add((string)reader1[0]);
            }
            reader1.Close();
        }
    }
}

班级浏览

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
   
    public partial class BrowseClass : Form
    {
   
        public static string t1 = "";
        public static string t2 = "";
        public static string t3 = "";
        public static string t4 = "";
        public static string t5 = "";
        public static string t6 = "";
        public static string[] array = new string[100];
        public static int index;
        public BrowseClass()
        {
   
            InitializeComponent();
        }

        private void button3_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void button4_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            string classId = classid.Text;
            string sql = "select * from Class where classId='" + classId + "'";
            MySqlCommand com = new MySqlCommand(sql, conn);
            MySqlDataReader reader = com.ExecuteReader();
            listBox1.Items.Clear();
            listBox1.Items.Add("班级编号\t班级名称\t班级人数\t班主任\t  班级说明\t");
            while(reader.Read()){
   
                listBox1.Items.Add(string.Format("{0}\t{1}\t{2}\t\t{3}\t  {4}", reader[0], reader[1], reader[2], reader[4], reader[3] ));
                
            }
            if (listBox1.Items.Count == 1)
            {
   
                MessageBox.Show("不存在此班级", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (listBox1.SelectedIndex>0)
            {
   
                //先删除这个班的学生
                string sql3 = "DELETE student FROM Student WHERE  Student.classId='" + array[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand comdt = new MySqlCommand(sql3, conn);
                comdt.ExecuteNonQuery();
                //删除
                #region 删除
                string sql = "DELETE FROM Class WHERE ClassId='" + array[listBox1.SelectedIndex-1] + "'";
                MySqlCommand cmd = new MySqlCommand(sql, conn);
                cmd.ExecuteNonQuery();
                #endregion
                MessageBox.Show("删除成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.Hide();
            }
           
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            if (listBox1.SelectedIndex>0)
            {
   
                index = listBox1.SelectedIndex - 1;
                #region 连接数据库
                //定义连接字符串
                string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
                MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
                conn.Open();//打开数据库
                #endregion
                string sql = "select * from Class where classId='" + array[index] + "'";
                MySqlCommand com = new MySqlCommand(sql, conn);
                MySqlDataReader reader = com.ExecuteReader();
                while (reader.Read()){
   
                    t1 = (string)reader[0];
                    t2 = (string)reader[1];
                    t3 = (string)reader[2];
                    t4 = (string)reader[3];
                    t5 = (string)reader[4];
                    t6 = (string)reader[5];
                }
                
                
                updateClass stu = new updateClass();
                stu.Show();
                this.Hide();
            }
           
        }

        private void BrowseClass_Load(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            //获取所有班级

            string sql = "SELECT * FROM Class";
            MySqlCommand com = new MySqlCommand(sql, conn);
            MySqlDataReader reader = com.ExecuteReader();
            listBox1.Items.Clear();
            listBox1.Items.Add(string.Format("班级编号\t班级名称\t班级人数\t班主任\t  班级说明\t"));
            int i = 0;
            while (reader.Read())
            {
   
                listBox1.Items.Add(string.Format("{0}\t{1}\t{2}\t\t{3}\t  {4}", reader[0], reader[1], reader[2], reader[4], reader[3]));
                array[i++] = (string)reader[0];//将编号依次存入数组
            }
            reader.Close();
        }
    }
}

修改班级信息

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class updateClass : Form
    {
   
        public updateClass()
        {
   
            InitializeComponent();
        }

        private void updateClass_Load(object sender, EventArgs e)
        {
   
            classId.Text = BrowseClass.t1;
            className.Text = BrowseClass.t2;
            count.Text = BrowseClass.t3;
            emplain.Text = BrowseClass.t4;
            teacher.Text = BrowseClass.t5;
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            //导入专业进集合

            MySqlCommand st = new MySqlCommand("select majorName from major", conn);
            MySqlDataReader reader1 = st.ExecuteReader();
            major.Items.Clear();
            while (reader1.Read())
            {
   
                major.Items.Add((string)reader1[0]);
            }
            reader1.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            string banjiId = classId.Text;
            string banjiName = className.Text;
            string banzhur = teacher.Text;
            string renshu = count.Text;

            //获得专业名称
            string zhuanye = "";
            if (major.SelectedIndex != -1)
            {
   
                zhuanye = major.SelectedItem.ToString();
            }
            else
            {
   
                major.SelectedIndex = 0;
            }
            //获得专业id
            string zhuanyeId = "";
            string sql = "select majorId from major where majorName='" + zhuanye + "'";
            MySqlCommand comt = new MySqlCommand(sql, conn);
            MySqlDataReader reader = comt.ExecuteReader();
            while (reader.Read())
            {
   
                zhuanyeId = (string)reader[0];
            }
            reader.Close();
            string shuoming = emplain.Text;
            string sql2 = "update Class set className='" + banjiName + "',classCount='" + renshu + "',teacher='" + banzhur + "',classExplain='" + shuoming + "',majorId='" + zhuanyeId + "' where ClassId='"+ banjiId + "'";
            MySqlCommand com2 = new MySqlCommand(sql2, conn);
            com2.ExecuteNonQuery();
             MessageBox.Show("修改成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            this.Hide();
            
        }
    }
}

（六）学生管理

添加学生

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class AddStudent : Form
    {
   
        public AddStudent()
        {
   
            InitializeComponent();
        }

        private void label2_Click(object sender, EventArgs e)
        {
   

        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
   

        }

        private void label5_Click(object sender, EventArgs e)
        {
   

        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (studentId.Text == "")
            {
   
                MessageBox.Show("学号不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else if (studentName.Text == "")
            {
   
                MessageBox.Show("学生姓名不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
   
                //  判断该学生是否已经存在
                string studentage = age.Text;
              
                //获得班级名称
                string banji = "";
                if (classId.SelectedIndex != -1)
                {
   
                    banji  = classId.SelectedItem.ToString();
                }
                else
                {
   
                    classId.SelectedIndex = 0;
                }
                //获得班级id
                string classid = "";
                string sql = "select ClassId from Class where className='" + banji + "'";
                MySqlCommand comt = new MySqlCommand(sql, conn);
                MySqlDataReader reader = comt.ExecuteReader();
                while (reader.Read())
                {
   
                    classid = (string)reader[0];
                }
                reader.Close();
                string miashu = textBox5.Text;
                string studentid = studentId.Text;
                string studentname = studentName.Text;
                string studentsex = sex.SelectedItem.ToString();
                string sql1 = "select count(*) from Student where studentId='" + studentid + "'";
                MySqlCommand com = new MySqlCommand(sql1, conn);
                if (Convert.ToInt32(com.ExecuteScalar()) > 0)//学生存在
                {
   
                    MessageBox.Show("此学生已存在", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }
                else//添加进数据库
                {
   
                    string sql2 = "insert into student set studentId='" + studentid + "',studentName='" + studentname + "',sex='" + studentsex + "',age='" + studentage + "',studentExplain='"+ miashu + "',classId='"+classid+"'";
                    MySqlCommand com2 = new MySqlCommand(sql2, conn);
                    com2.ExecuteNonQuery();
                    MessageBox.Show("添加成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    this.Hide();
                }
            }
        }

        private void AddStudent_Load(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            //导入班级进集合
            MySqlCommand st = new MySqlCommand("select className from Class", conn);
            MySqlDataReader reader1 = st.ExecuteReader();
            classId.Items.Clear();
            while (reader1.Read())
            {
   
                classId.Items.Add((string)reader1[0]);
            }
            reader1.Close();
        }
    }
}

学生浏览

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class BrowseStudent : Form
    {
   
        public static string t1 = "";
        public static string t2 = "";
        public static string t3 = "";
        public static string t4 = "";
        public static string t5 = "";
        public static string t6 = "";
        public static string[] array = new string[100];
        public BrowseStudent()
        {
   
            InitializeComponent();
        }

        private void button3_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void button4_Click(object sender, EventArgs e)
        {
   
            string studentid = studentId.Text;
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            string sql = "select * from Student where studentId='" + studentid + "'";
            MySqlCommand com = new MySqlCommand(sql, conn);
            MySqlDataReader reader = com.ExecuteReader();
            listBox1.Items.Clear();
            listBox1.Items.Add("  学号\t\t姓名\t性别\t年龄\t 班级编号\t 说明\t");
            while (reader.Read())
            {
   
                listBox1.Items.Add(string.Format("{0}\t{1}\t{2}\t{3}\t{4}\t{5}", reader[0], reader[1], reader[2],reader[3],reader[5],reader[4]));
                
            }
            if (listBox1.Items.Count == 1)
            {
   
                MessageBox.Show("不存在此学生", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (listBox1.SelectedIndex>0)
            {
   
                //删除学生的所有成绩
                string sql1 = "delete from choose where studentId='"+ BrowseStudent.t1 + "'";
                MySqlCommand cmdt = new MySqlCommand(sql1, conn);
                cmdt.ExecuteNonQuery();
                //删除
                #region 删除
                string sql = "DELETE FROM Student WHERE studentId='" + BrowseStudent.t1 + "'";
                MySqlCommand cmd = new MySqlCommand(sql, conn);
                cmd.ExecuteNonQuery();
                #endregion
                MessageBox.Show("删除成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.Hide();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            if (listBox1.SelectedIndex> 0)
            {
   
                #region 连接数据库
                //定义连接字符串
                string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
                MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
                conn.Open();//打开数据库
                #endregion
                string sql = "select * from Student where studentId='" + array[listBox1.SelectedIndex-1] + "'";
                MySqlCommand com = new MySqlCommand(sql, conn);
                MySqlDataReader reader = com.ExecuteReader();
                while (reader.Read())
                {
   
                    t1 = (string)reader[0];
                    t2 = (string)reader[1];
                    t3 = (string)reader[2];
                    t4 = (string)reader[3];
                    t5 = (string)reader[4];
                    t6 = (string)reader[5];
                }
                
                UpdateStudent stu = new UpdateStudent();
                stu.Show(this);
                this.Hide();
            }
        }

        private void BrowseStudent_Load(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            //获取所有班级

            string sql = "SELECT * FROM student";
            MySqlCommand com = new MySqlCommand(sql, conn);
            MySqlDataReader reader = com.ExecuteReader();
            listBox1.Items.Clear();
            listBox1.Items.Add(string.Format("  学号\t\t姓名\t性别\t年龄\t 班级编号\t 说明\t"));
            int i = 0;
            while (reader.Read())
            {
   
                listBox1.Items.Add(string.Format("{0}\t{1}\t{2}\t{3}\t{4}\t{5}", reader[0], reader[1], reader[2], reader[3], reader[5], reader[4]));
                array[i++] = (string)reader[0];//将编号依次存入数组
            }
            reader.Close();

        }
    }
    
}

修改学生信息

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class UpdateStudent : Form
    {
   
        public UpdateStudent()
        {
   
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (studentId.Text == "")
            {
   
                MessageBox.Show("学号不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else if (studentName.Text == "")
            {
   
                MessageBox.Show("学生姓名不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
   
                //  判断该学生是否已经存在
                string studentage = age.Text;

                //获得班级名称
                string banji = "";
                if (classId.SelectedIndex != -1)
                {
   
                    banji = classId.SelectedItem.ToString();
                }
                else
                {
   
                    classId.SelectedIndex = 0;
                }
                //获得班级id
                string classid = "";
                string sql = "select ClassId from Class where className='" + banji + "'";
                MySqlCommand comt = new MySqlCommand(sql, conn);
                MySqlDataReader reader = comt.ExecuteReader();
                while (reader.Read())
                {
   
                    classid = (string)reader[0];
                }
                reader.Close();
                string miashu = textBox5.Text;
                string studentid = studentId.Text;
                string studentname = studentName.Text;
                string studentsex = sex.SelectedItem.ToString();
                string sql1 = "select count(*) from Student where studentId='" + studentid + "'";                        
                string sql2 = "update student set studentName='" + studentname + "',sex='" + studentsex + "',age='" + studentage + "',studentExplain='" + miashu + "',classId='" + classid + "' where studentId='"+ studentid + "'";
                MySqlCommand com2 = new MySqlCommand(sql2, conn);
                com2.ExecuteNonQuery();
                MessageBox.Show("修改成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.Hide();
            }
        }

        private void UpdateStudent_Load(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            studentId.Text = BrowseStudent.t1;
            studentName.Text = BrowseStudent.t2;
            age.Text = BrowseStudent.t4;
            textBox5.Text = BrowseStudent.t5;
            //导入班级进集合
            MySqlCommand st = new MySqlCommand("select className from Class", conn);
            MySqlDataReader reader1 = st.ExecuteReader();
            classId.Items.Clear();
            while (reader1.Read())
            {
   
                classId.Items.Add((string)reader1[0]);
            }
            reader1.Close();

        }
    }
}

（七）课程管理

添加课程

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace studentStatusManagementSyatem
{
   
    public partial class AddCourse : Form
    {
   
        public AddCourse()
        {
   
            InitializeComponent();
        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
   

        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (courseId.Text == "")
            {
   
                MessageBox.Show("课程编号不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }else if (courseName.Text == "")
            {
   
                    MessageBox.Show("课程名不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }else if (courseCredit.Text == "")
            {
   
                MessageBox.Show("课程学分不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
   
                //判断课程编号是否已存在
                string courseid = courseId.Text;
                string credit = courseCredit.Text;
                string coursename = courseName.Text;
                string shuoming = textBox1.Text;
                //添加入课程表中
                string sql = "select count(*) from Course where courseId='" + courseid + "'";
                MySqlCommand com = new MySqlCommand(sql, conn);
                if (Convert.ToInt32(com.ExecuteScalar()) > 0)//课程存在
                {
   
                    MessageBox.Show("此课程已存在", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }
                else//添加进数据库
                {
   
                    string sql2 = "insert into Course set courseID='" + courseid + "',courseGrade='" + credit + "',courseName='" + coursename + "',courseExplain='" + shuoming + "'";
                    MySqlCommand com2 = new MySqlCommand(sql2, conn);
                    com2.ExecuteNonQuery();
                    MessageBox.Show("添加成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    this.Hide();
                }

            }
        }

        private void AddCourse_Load(object sender, EventArgs e)
        {
   

        }
    }
}

课程浏览

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace studentStatusManagementSyatem
{
   
    public partial class BrowseCourse : Form
    {
   
        public static string t1;
        public static string t2;
        public static string t3;
        public static string t4;
        string[] array = new string[100];
        public BrowseCourse()
        {
   
            InitializeComponent();
        }

        private void button3_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void BrowseCourse_Load(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            //获取所有专业

            string sql = "SELECT * FROM course";
            MySqlCommand com = new MySqlCommand(sql, conn);
            MySqlDataReader reader = com.ExecuteReader();
            listBox1.Items.Clear();
            listBox1.Items.Add(string.Format("课程编号       课程学分          课程名称           课程说明"));
            int i = 0;
            while (reader.Read())
            {
   
                listBox1.Items.Add(string.Format("{0,5}\t{1,10}\t{2,15}\t{3,10}", reader[0], reader[1], reader[2],reader[3]));
                array[i++] = (string)reader[0];//将编号依次存入数组
            }
            reader.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (listBox1.SelectedIndex > 0)
            {
   
                //删除所有选课记录
                string sql1 = "delete from choose where courseId='" + array[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand comt = new MySqlCommand(sql1, conn);
                comt.ExecuteNonQuery();
                //删除
                #region 删除
                string sql = "DELETE FROM Course WHERE courseId='" + array[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand cmd = new MySqlCommand(sql, conn);
                cmd.ExecuteNonQuery();
                #endregion
                MessageBox.Show("删除成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.Hide();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion

            if (listBox1.SelectedIndex > 0)
            {
   
                //查数据
                string sql2 = "select * from Course where courseId='" + array[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand cmdd = new MySqlCommand(sql2, conn);
                MySqlDataReader reader = cmdd.ExecuteReader();
                while (reader.Read())
                {
   
                    t1 = (string)reader[0];
                    t2 = (string)reader[1];
                    t3 = (string)reader[2];
                    t4 = (string)reader[3];
                }
                reader.Close();
                UpdateCourse stu = new UpdateCourse();
                stu.Show(this);
                this.Hide();
            }
        }
    }
}

课程信息修改

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace studentStatusManagementSyatem
{
   
    public partial class UpdateCourse : Form
    {
   
        public UpdateCourse()
        {
   
            InitializeComponent();
        }

        private void UpdateCourse_Load(object sender, EventArgs e)
        {
   
            courseId.Text = BrowseCourse.t1;
            courseCredit.Text = BrowseCourse.t2;
            courseName.Text = BrowseCourse.t3;
            textBox1.Text = BrowseCourse.t4;
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            string courseid = courseId.Text;
            string credit = courseCredit.Text;
            string coursename = courseName.Text;
            string shuoming = textBox1.Text;
            //添加入课程表中
            string sql2 = "update  Course set courseGrade='" + credit + "',courseName='" + coursename + "',courseExplain='" + shuoming + "' where courseId='"+courseid+"'";
            MySqlCommand com2 = new MySqlCommand(sql2, conn);
            com2.ExecuteNonQuery();
            MessageBox.Show("修改成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
             this.Hide();
        }
    }
}

（八）成绩管理

录入成绩

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace studentStatusManagementSyatem
{
   
    public partial class AddScore : Form
    {
   
        public AddScore()
        {
   
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (studentId.Text == "")
            {
   
                MessageBox.Show("学号不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }else if (courseId.Text == "")
            {
   
                MessageBox.Show("课程号不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }else if (Score.Text == "")
            {
   
                MessageBox.Show("成绩不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

            }
            else
            {
   
                //判断是否已经录入
                string studentid = studentId.Text;
                string courseid = courseId.Text;
                string score = Score.Text;
                string sql1 = "SELECT COUNT(*) FROM choose WHERE studentId='"+studentid+"' AND courseId='"+courseid+"' ";
                //判断是否存在此学生
                string sql = "SELECT COUNT(*) FROM student WHERE studentId = '"+studentid+"'";
                MySqlCommand com1 = new MySqlCommand(sql,conn);
                // 判断是否存在此课程
                string sql3 = "SELECT COUNT(*) FROM course WHERE courseId = '" +courseid +"'";
                MySqlCommand com2 = new MySqlCommand(sql3, conn);
                MySqlCommand com = new MySqlCommand(sql1, conn);
                if (Convert.ToInt32(com1.ExecuteScalar())==0)
                {
   
                    MessageBox.Show("不存在此学生，请先添加", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }else if (Convert.ToInt32(com2.ExecuteScalar()) == 0)
                {
   
                    MessageBox.Show("不存在此课程，请先添加", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }else if (Convert.ToInt32(com.ExecuteScalar()) > 0)//成绩存在
                {
   
                    MessageBox.Show("此成绩已存在", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                }else//添加进数据库
                {
   
                    string sql2 = "insert into choose set studentId='" + studentid + "',courseId='" + courseid + "',grade='"+score+"'";
                    MySqlCommand com3 = new MySqlCommand(sql2, conn);
                    com3.ExecuteNonQuery();
                    MessageBox.Show("添加成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    this.Hide();
                }
            }
        }

        private void AddScore_Load(object sender, EventArgs e)
        {
   

        }
    }
}

浏览成绩

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace studentStatusManagementSyatem
{
   
    public partial class BrowseScore : Form
    {
   
       public static string[] id1 = new string[100];
       public static string[] id2 = new string[100];
        public static string[] id3 = new string[100];
        public static int index;
        public BrowseScore()
        {
   
            InitializeComponent();
        }

        private void button3_Click(object sender, EventArgs e)
        {
   
            this.Hide();
        }

        private void button4_Click(object sender, EventArgs e)
        {
   
            string studentid = studentId.Text;
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            string sql = "SELECT course.courseId,student.studentId,studentName,courseName,grade FROM choose,student,course WHERE choose.courseId=course.courseId AND choose.studentId=student.studentId AND student.studentId='"+studentid+"'";
            MySqlCommand com = new MySqlCommand(sql, conn);
            MySqlDataReader reader = com.ExecuteReader();
            listBox1.Items.Clear();
            listBox1.Items.Add("课程号\t学号\t\t    姓名\t  课程名\t\t成绩");
            int i = 0;
            while (reader.Read())
            {
   
                listBox1.Items.Add(string.Format("{0,5}\t{1,5}\t{2,10}\t{3,10}\t{4,10}", reader[0], reader[1], reader[2], reader[3],reader[4]));
                id1[i] = (string)reader[0];
                id2[i] = (string)reader[1];
                id3[i++] = (string)reader[4];
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
   
            #region 连接数据库
            //定义连接字符串
            string connStr = "Database=StudentStatusManagement;Data Source=127.0.0.1;port=3306;User Id=root;";
            MySqlConnection conn = new MySqlConnection(connStr);//创建Connection对象
            conn.Open();//打开数据库
            #endregion
            if (listBox1.SelectedIndex > 0)
            {
   
                //删除
                #region 删除
                string sql = "delete FROM choose WHERE choose.courseId='"+ id1[listBox1.SelectedIndex - 1] + "' AND choose.studentId='"+ id2[listBox1.SelectedIndex - 1] + "'";
                MySqlCommand cmd = new MySqlCommand(sql, conn);
                cmd.ExecuteNonQuery();
                #endregion
                MessageBox.Show("删除成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.Hide();
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
   
            if (listBox1.SelectedIndex > 1)
            {
   
                index = listBox1.SelectedIndex - 1;
                UpdateSocore stu = new UpdateSocore();
                stu.Show(this);
                this.Hide();
            }
            
        }

        private void BrowseScore_Load(object sender, EventArgs e)
        {
   

        }
    }
}

转载：https://blog.csdn.net/Anterior_condyle/article/details/109898198