大学数据库课程设计–一个简单的学生选课系统

一、系统简介

一个超级简单的学生选课系统，使用Windows窗体设计界面，使用C#语言实现各种功能，数据库使用的是SQL。由于时间原因，做的非常仓促，系统中没有查询功能，能够实现数据的增删改。下面开始系统演示吧。

二、系统演示

1、登录界面

我使用Windows窗体设计成这个样子看着还算不错，嘻嘻。

    public partial class Form1 : Form{public Form1(){InitializeComponent();}private void timer1_Tick(object sender, EventArgs e){if(pictureBox1.Location.X<150){pictureBox1.Location = new Point(pictureBox1.Location.X + 1, pictureBox1.Location.Y);}//图标移动else{if(comboBox1.Text == "学生"){string sql = "select * from Stu where Name = '" + textBox1.Text + "'and Password ='" + textBox2.Text + "'";Dao dao = new Dao();IDataReader dr = dao.read(sql);dr.Read();string Sid = dr["ID"].ToString();Form3 form3 = new Form3(Sid);form3.Show();//显示这个窗体this.Hide();//隐藏这个窗体}else{if(comboBox1.Text == "老师"){string sql = "select * from Teacher where Name = '" + textBox1.Text + "'and Password ='" + textBox2.Text + "'";Dao dao = new Dao();IDataReader dr = dao.read(sql);dr.Read();string Tid = dr["ID"].ToString();Form7 form7 = new Form7(Tid);form7.Show();this.Hide();}else{if(comboBox1.Text == "管理员"){Form5 form5 = new Form5();form5.Show();this.Hide();}}}timer1.Stop();}}//判断是否登录private string login(){if(textBox1.Text == ""||textBox2.Text == ""||comboBox1.Text == ""){MessageBox.Show("输入不完整，请检查","提示",MessageBoxButtons.OK, MessageBoxIcon.Warning);}if(comboBox1.Text == "学生"){string sql = "select * from Stu where Name = '" +textBox1.Text+ "'and Password ='" +textBox2.Text+ "'";Dao dao = new Dao();IDataReader dr = dao.read(sql);if(dr.Read()){return "学生";}else{MessageBox.Show("用户名或密码错误");return "-1";}}if(comboBox1.Text == "老师"){string sql = "select * from Teacher where Name = '" +textBox1.Text+ "'and Password ='" +textBox2.Text+ "'";Dao dao = new Dao();IDataReader dr = dao.read(sql);if (dr.Read()){return "老师";}else{MessageBox.Show("用户名或密码错误");return "-1";}}if(comboBox1.Text == "管理员"){if(textBox1.Text == "admin"&&textBox2.Text == "admin"){return "管理员";}else{MessageBox.Show("用户名或密码错误");return "-1";}}return "-1";}private void button2_Click(object sender, EventArgs e){textBox1.Text = null;textBox2.Text = null;comboBox1.Text = null;}private void textBox1_TextChanged(object sender, EventArgs e){}//登录事件private void button1_Click_1(object sender, EventArgs e){if (login() != "-1"){timer1.Start();//启动计时器控件，图片开始移动textBox1.Visible = false;textBox2.Visible = false;comboBox1.Visible = false;label1.Visible = false;label2.Visible = false;label3.Visible = false;}else{MessageBox.Show("信息错误", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);}}private void comboBox1_SelectedIndexChanged(object sender, EventArgs e){}private void Form1_FormClosed(object sender, FormClosedEventArgs e){Application.Exit();//强行结束整个程序}}

上述为系统登录的代码，请结合一些注释理解。系统登录界面，有三个权限，分别为学生、老师及管理员，在代码中，都有对应的代码，请仔细看。

2、学生操作界面

 public partial class Form3 : Form{string SID;public Form3(string Sid){SID = Sid;InitializeComponent();toolStripStatusLabel3.Text = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");//显示当前时间toolStripStatusLabel1.Text = "欢迎学号为" + SID + "的同学登录选课系统";timer1.Start();Table();}public void Table(){dataGridView1.Rows.Clear();string sql = "select * from Course";Dao dao = new Dao();IDataReader dr = dao.read(sql);while (dr.Read()){string a, b, c, d;a = dr["ID"].ToString();b = dr["Name"].ToString();c = dr["Credit"].ToString();d = dr["Teacher"].ToString();string[] str = { a, b, c, d};dataGridView1.Rows.Add(str);}dr.Close();//关闭链接}private void timer1_Tick(object sender, EventArgs e){toolStripStatusLabel3.Text = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");//显示当前时间}private void Form3_FormClosed(object sender, FormClosedEventArgs e){Application.Exit();//强行结束整个程序}private void 选课ToolStripMenuItem_Click(object sender, EventArgs e){string Cid = dataGridView1.SelectedCells[0].Value.ToString();//获取选中得课程号string sql1 = "Select * from  CourseChoose where Sid = '"+SID+"' and Cid = '"+Cid+"'";Dao dao = new Dao();IDataReader dc = dao.read(sql1);if(!dc.Read()){               string sql = "Insert into CourseChoose values('" + SID + "','" + Cid + "')";int i = dao.Execute(sql);if(i>0){MessageBox.Show("选课成功");}}else{MessageBox.Show("不允许重复选课");}}private void 我的课程ToolStripMenuItem_Click(object sender, EventArgs e){Form31 f = new Form31(SID);f.Show();}private void 退出ToolStripMenuItem_Click(object sender, EventArgs e){Form1 form1 = new Form1();form1.Show();//显示这个窗体this.Hide();//隐藏这个窗体}private void 修改个人密码ToolStripMenuItem_Click(object sender, EventArgs e){Form32 f = new Form32(SID);f.ShowDialog();}}

 public partial class Form31 : Form{   string SID;public Form31(string Sid){SID = Sid;InitializeComponent();Table();}public void Table(){dataGridView1.Rows.Clear();string sql = "select * from CourseChoose where Sid = '"+SID+"'";Dao dao = new Dao();IDataReader dr = dao.read(sql);while (dr.Read()){string CID = dr["Cid"].ToString();string sql2 = "select* from Course where ID= '" + CID + "'";IDataReader dr2 = dao.read(sql2);dr2.Read();string a, b, c, d;a = dr2["ID"].ToString();b = dr2["Name"].ToString();c = dr2["Credit"].ToString();d = dr2["Teacher"].ToString();string[] str = { a, b, c, d };dataGridView1.Rows.Add(str);dr2.Close();}dr.Close();//关闭链接}private void Form31_Load(object sender, EventArgs e){}private void 取消这门课ToolStripMenuItem_Click(object sender, EventArgs e){DialogResult r = MessageBox.Show("确定要取消吗？", "提示", MessageBoxButtons.OKCancel);if (r == DialogResult.OK){string Cid = dataGridView1.SelectedCells[0].Value.ToString();string sql = "delete CourseChoose where Sid = '" + SID + "' and Cid ='" + Cid + "'";Dao dao = new Dao();dao.Execute(sql);Table();}}}

public partial class Form32 : Form{string SID;public Form32(){InitializeComponent();}public Form32(string Sid){InitializeComponent();SID = Sid;string sql = "select * from Stu where ID = '" + SID + "'";Dao dao = new Dao();IDataReader dr = dao.read(sql);dr.Read();textBox1.Text = dr["PassWord"].ToString();dr.Close();}private void button1_Click(object sender, EventArgs e){string sql = "Update Stu set Password = '" + textBox2.Text +"'where ID = '"+SID+"'";Dao dao = new Dao();int i = dao.Execute(sql);if(i>0){MessageBox.Show("修改成功");}this.Hide();//隐藏这个窗体}private void Form32_FormClosed(object sender, FormClosedEventArgs e){Application.Exit();//强行结束整个程序}}

上述三个窗体为学生操作面，在第一张主操作界面，点击不同的按钮，会跳转至不同的操作界面，窗体下给出控制代码.

3、老师操作界面

public partial class Form7 : Form{string TID;public Form7(string Tid){TID = Tid;InitializeComponent();toolStripStatusLabel1.Text = "欢迎工号为" + TID + "的老师登录选课系统";Table();}public void Table(){dataGridView1.Rows.Clear();string sql = "select * from Teacher where ID = '"+TID+"'";Dao dao = new Dao();IDataReader dr = dao.read(sql);while (dr.Read()){string NAME = dr["Name"].ToString();string sql2 = "select* from Course where Teacher= '" + NAME + "'";IDataReader dr2 = dao.read(sql2);dr2.Read();string a, b, c;a = dr2["ID"].ToString();b = dr2["Name"].ToString();c = dr2["Credit"].ToString();string[] str = { a, b, c};dataGridView1.Rows.Add(str);}dr.Close();//关闭链接}private void 修改个人密码ToolStripMenuItem_Click(object sender, EventArgs e){Form8 f = new Form8(TID);f.ShowDialog();}private void 系统退出ToolStripMenuItem_Click(object sender, EventArgs e){Form1 form1 = new Form1();form1.Show();//显示这个窗体this.Hide();//隐藏这个窗体}private void Form7_FormClosed(object sender, FormClosedEventArgs e){Application.Exit();//强行结束整个程序}}

  public partial class Form8 : Form{string TID;public Form8(){InitializeComponent();}public Form8(string Tid){InitializeComponent();TID = Tid;string sql = "select * from Teacher where ID = '" + TID + "'";Dao dao = new Dao();IDataReader dr = dao.read(sql);dr.Read();textBox1.Text = dr["PassWord"].ToString();dr.Close();}private void button1_Click(object sender, EventArgs e){string sql = "Update Teacher set Password = '" + textBox2.Text + "'where ID = '" + TID + "'";Dao dao = new Dao();int i = dao.Execute(sql);if (i > 0){this.Hide();MessageBox.Show("修改成功");}this.Hide();//隐藏这个窗体}  }

上述两个窗体为老师操作界面，在第一张主操作界面，点击不同的按钮，会跳转至不同的操作界面，窗体下给出控制代码。老师操作界面功能比较少。

4、管理员操作界面

 public partial class Form5 : Form{public Form5(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){Form2 form2 = new Form2();form2.Show();//显示这个窗体this.Hide();}private void button2_Click(object sender, EventArgs e){Form4 form4 = new Form4();form4.Show();//显示这个窗体this.Hide();}private void button3_Click(object sender, EventArgs e){Form6 form6 = new Form6();form6.Show();//显示这个窗体this.Hide();}private void button4_Click(object sender, EventArgs e){Form1 form1 = new Form1();form1.Show();//显示这个窗体this.Hide();}}

public partial class Form2 : Form{public Form2(){InitializeComponent();toolStripStatusLabel3.Text = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");//显示当前时间timer1.Start();Table();}private void Form2_FormClosed(object sender, FormClosedEventArgs e){Application.Exit();//强行结束整个程序}//让表显示数据public void Table(){dataGridView1.Rows.Clear();string sql = "select * from Stu";Dao dao = new Dao();IDataReader dr = dao.read(sql);while (dr.Read()){string a, b, c, d, e;a = dr["ID"].ToString();b = dr["Name"].ToString();c = dr["Sex"].ToString();d = dr["Class"].ToString();e = dr["Dept"].ToString();string[] str = { a, b, c, d, e };dataGridView1.Rows.Add(str);}dr.Close();//关闭链接}private void 添加学生信息ToolStripMenuItem_Click(object sender, EventArgs e){Form21 f = new Form21(this);f.ShowDialog();//添加学生信息的窗体}private void 修改学生信息ToolStripMenuItem_Click(object sender, EventArgs e){string[] str = { dataGridView1.SelectedCells[0].Value.ToString(), dataGridView1.SelectedCells[1].Value.ToString(), dataGridView1.SelectedCells[2].Value.ToString(), dataGridView1.SelectedCells[3].Value.ToString(), dataGridView1.SelectedCells[4].Value.ToString() };Form21 f = new Form21(str,this); f.ShowDialog(); }private void 退出ToolStripMenuItem_Click(object sender, EventArgs e){Form5 form5 = new Form5();form5.Show();//显示这个窗体this.Hide();//隐藏这个窗体}private void 删除学生信息ToolStripMenuItem_Click(object sender, EventArgs e){DialogResult r = MessageBox.Show("确定要删除吗？", "提示", MessageBoxButtons.OKCancel);if(r == DialogResult.OK){string id, name;id = dataGridView1.SelectedCells[0].Value.ToString();name = dataGridView1.SelectedCells[1].Value.ToString();string sql = "delete from Stu where ID = '" + id + "'and Name = '" + name + "'";Dao dao = new Dao();dao.Execute(sql);dataGridView1.Rows.Clear();Table();}}private void 刷新ToolStripMenuItem_Click(object sender, EventArgs e){dataGridView1.Rows.Clear();Table();}}

  public partial class Form21 : Form{Form2 form2;string[] str = new string[5];public Form21(Form2 f){InitializeComponent();button5.Visible = false; //插入时 隐藏修改  form2 = f;}//用于修改 参数位于一个数组public Form21(string[] a,Form2 f) {InitializeComponent();for(int i=0;i<5;i++){str[i] = a[i];}textBox1.Text = str[0];textBox2.Text = str[1];textBox3.Text = str[2];textBox4.Text = str[3];textBox5.Text = str[4];button1.Visible = false;//修改时 隐藏插入form2 = f; }private void Form21_Load(object sender, EventArgs e){}private void label5_Click(object sender, EventArgs e){}//添加一条学生事件private void button1_Click(object sender, EventArgs e){if(textBox1.Text==""||textBox2.Text==""||textBox3.Text==""||textBox4.Text==""||textBox5.Text==""){MessageBox.Show("输入不完整，请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);}else{string sql = "Insert into Stu values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','123456')";Dao dao = new Dao();int i = dao.Execute(sql);if (i > 0){MessageBox.Show("插入成功");textBox1.Text = null;textBox2.Text = null;textBox3.Text = null;textBox4.Text = null;textBox5.Text = null;}form2.Table();this.Hide();}}private void button2_Click(object sender, EventArgs e){textBox1.Text = null;textBox1.Text = null;textBox1.Text = null;textBox1.Text = null;textBox1.Text = null;textBox1.Text = null;}private void textBox3_TextChanged(object sender, EventArgs e){}private void button5_Click(object sender, EventArgs e){if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "" || textBox5.Text == ""){MessageBox.Show("修改后有空项，请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);}else{if(textBox1.Text!=str[0]){string sql = "update Stu set ID = '"+textBox1.Text+"'where ID = '"+str[0]+"' and Name = '"+str[1]+"'";Dao dao = new Dao();dao.Execute(sql);str[0] = textBox1.Text;}if (textBox2.Text != str[1]){string sql = "update Stu set Name = '" + textBox2.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";Dao dao = new Dao();dao.Execute(sql);str[1] = textBox2.Text;}if (textBox3.Text != str[2]){string sql = "update Stu set Sex = '" + textBox3.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";Dao dao = new Dao();dao.Execute(sql);str[2] = textBox3.Text;}if (textBox4.Text != str[3]){string sql = "update Stu set Class= '" + textBox4.Text+ "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";Dao dao = new Dao();dao.Execute(sql);str[3] = textBox4.Text;}if (textBox5.Text != str[4]){string sql = "update Stu set Dept = '" + textBox5.Text+ "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";Dao dao = new Dao();dao.Execute(sql);str[4] = textBox5.Text;}form2.Table();this.Hide();}}private void Form21_FormClosed(object sender, FormClosedEventArgs e){Application.Exit();//强行结束整个程序}}

public partial class Form41 : Form   {        Form4 form4;        string[] str = new string[5];        public Form41(Form4 f)        {            InitializeComponent();            button3.Visible = false; //插入时 隐藏修改             form4 = f;        }        //用于修改 参数位于一个数组       public Form41(string[] a,Form4 f)        {            InitializeComponent(); for (int i = 0; i < 5; i++)           {                str[i] = a[i];        }           textBox1.Text = str[0];  textBox2.Text = str[1];    textBox3.Text = str[2];     textBox4.Text = str[3];   textBox5.Text = str[4];         button1.Visible = false;//修改时 隐藏插入           form4 = f;  }        //添加一条学生信息        private void button1_Click(object sender, EventArgs e)        {            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "" || textBox5.Text == "")            {                MessageBox.Show("输入不完整，请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                string sql = "Insert into Teacher values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','123456')";                                 Dao dao = new Dao();                int i = dao.Execute(sql);               if (i > 0)               {                    MessageBox.Show("插入成功");                    textBox1.Text = null;                    textBox2.Text = null;                    textBox3.Text = null;                    textBox4.Text = null;                    textBox5.Text = null;                }                form4.Table();                this.Hide();            }        }         private void button2_Click(object sender, EventArgs e)        {            textBox1.Text = null;            textBox2.Text = null;            textBox3.Text = null;            textBox4.Text = null;           textBox5.Text = null;                   }        private void button3_Click(object sender, EventArgs e)        {            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "" || textBox5.Text == "")            {                MessageBox.Show("修改后有空项，请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);               }           else            {                if (textBox1.Text != str[0])                {                    string sql = "update Teacher set ID = '" + textBox1.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                   Dao dao = new Dao();                   dao.Execute(sql);                    str[0] = textBox1.Text;               }                if (textBox2.Text != str[1])                {                    string sql = "update Teacher set Name = '" + textBox2.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                   Dao dao = new Dao();                    dao.Execute(sql);                    str[1] = textBox2.Text;                }                if (textBox3.Text != str[2])                {                    string sql = "update Teacher set Sex = '" + textBox3.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                    Dao dao = new Dao();                    dao.Execute(sql);                    str[2] = textBox3.Text;               }                if (textBox4.Text != str[3])                {                    string sql = "update Teacher set Dept= '" + textBox4.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                   Dao dao = new Dao();                    dao.Execute(sql);                    str[3] = textBox4.Text;                }                if (textBox5.Text != str[4])                {                    string sql = "update Teacher set Zc = '" + textBox5.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                   Dao dao = new Dao();                    dao.Execute(sql);                   str[4] = textBox5.Text;               }                form4.Table();                this.Hide();            }       }    }

 public partial class Form6 : Form    {        public Form6()        {            InitializeComponent();                         Table();        }        public void Table()        {            dataGridView1.Rows.Clear();            string sql = "select * from Course";            Dao dao = new Dao();            IDataReader dr = dao.read(sql);            while (dr.Read())            {                string a, b, c, d;                a = dr["ID"].ToString();                b = dr["Name"].ToString();                c = dr["Credit"].ToString();                d = dr["Teacher"].ToString();                string[] str = { a, b, c, d};                dataGridView1.Rows.Add(str);            }            dr.Close();//关闭链接        }        private void 添加课程ToolStripMenuItem1_Click(object sender, EventArgs e)        {            Form61 f = new Form61(this);            f.ShowDialog();//添加学生信息的窗体        }        private void 修改课程ToolStripMenuItem_Click(object sender, EventArgs e)        {            string[] str = { dataGridView1.SelectedCells[0].Value.ToString(), dataGridView1.SelectedCells[1].Value.ToString(), dataGridView1.SelectedCells[2].Value.ToString(), dataGridView1.SelectedCells[3].Value.ToString() };            Form61 f = new Form61(str, this);            f.ShowDialog();        }        private void 删除课程ToolStripMenuItem_Click(object sender, EventArgs e)        {            DialogResult r = MessageBox.Show("确定要删除吗？", "提示", MessageBoxButtons.OKCancel);            if (r == DialogResult.OK)            {                string id, name;                id = dataGridView1.SelectedCells[0].Value.ToString();                name = dataGridView1.SelectedCells[1].Value.ToString();                string sql = "delete from Course where ID = '" + id + "'and Name = '" + name + "'";                MessageBox.Show(sql);                Dao dao = new Dao();                dao.Execute(sql);                dataGridView1.Rows.Clear();                Table();            }        }        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)        {            Form5 form5 = new Form5();            form5.Show();//显示这个窗体            this.Hide();//隐藏这个窗体        }    }

public partial class Form61 : Form    {        Form6 form6;        string[] str = new string[4];        public Form61(Form6 f)        {            InitializeComponent();            button3.Visible = false; //插入时 隐藏修改             form6 = f;        }        public Form61(string[] a, Form6 f)        {            InitializeComponent();            for (int i = 0; i < 4; i++)            {                str[i] = a[i];            }            textBox1.Text = str[0];            textBox2.Text = str[1];            textBox3.Text = str[2];            textBox4.Text = str[3];                    button1.Visible = false;//修改时 隐藏插入            form6 = f ;        }        private void label1_Click(object sender, EventArgs e)        {        }        private void textBox4_TextChanged(object sender, EventArgs e)        {        }        private void button1_Click(object sender, EventArgs e)        {            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == ""  )            {                MessageBox.Show("输入不完整，请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                string sql = "Insert into Course values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "' )";                MessageBox.Show(sql);                Dao dao = new Dao();                int i = dao.Execute(sql);                if (i > 0)                {                    MessageBox.Show("插入成功");                    textBox1.Text = null;                    textBox2.Text = null;                    textBox3.Text = null;                    textBox4.Text = null;                                 }                form6.Table();                this.Hide();            }        }        private void button3_Click(object sender, EventArgs e)        {            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "")            {                MessageBox.Show("修改后有空项，请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                if (textBox1.Text != str[0])                {                    string sql = "update Course set ID = '" + textBox1.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                    Dao dao = new Dao();                    dao.Execute(sql);                    str[0] = textBox1.Text;                }                if (textBox2.Text != str[1])                {                    string sql = "update Course set Name = '" + textBox2.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                    Dao dao = new Dao();                    dao.Execute(sql);                    str[1] = textBox2.Text;                }                if (textBox3.Text != str[2])                {                    string sql = "update Course set Credit = '" + textBox3.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                    Dao dao = new Dao();                    dao.Execute(sql);                    str[2] = textBox3.Text;                }                if (textBox4.Text != str[3])                {                    string sql = "update Course set Teacher = '" + textBox4.Text + "'where ID = '" + str[0] + "' and Name = '" + str[1] + "'";                    Dao dao = new Dao();                    dao.Execute(sql);                    str[3] = textBox4.Text;                }                              form6.Table();                this.Hide();            }        }        private void button2_Click(object sender, EventArgs e)        {            textBox1.Text = null;            textBox2.Text = null;            textBox3.Text = null;            textBox4.Text = null;                    }  }

上述窗体为管理员操作界面，在第一张主操作界面，点击不同的按钮，会跳转至不同的操作界面，窗体下给出控制代码.管理员权限的用户名及密码皆为admin

4、数据库引用

这是数据库的课程设计，怎么能少了数据库尼！！！以下为数据库的链接代码。很重要！！！！

 class Dao    {        public SqlConnection connection()        {            string str = "Data Source=LAPTOP-APLE92MU;Initial Catalog=Demo;Integrated Security=True";         SqlConnection sc = new SqlConnection(str);           sc.Open();//打开数据库链接           return sc;       }       public SqlCommand command(string sql)        {           SqlCommand cmd = new SqlCommand(sql, connection());       return cmd;        }        //用于delete update insert 返回受影响的行数       public int Execute(string sql)       {            return command(sql).ExecuteNonQuery();       }        //用于select 返回SqlDataReader对象，包含select到的数据        public SqlDataReader read(string sql)       {            return command(sql).ExecuteReader();    }   }

这是自己写的一个Dao类自定义函数用于数据库的链接及数据库信息的更新，Data Source 是你数据库服务器名称，Catalog是你数据库的名字，后面的不变即可。

三、系统总结

这个为一个简单的学生选课系统，写的很匆忙，还有一些功能没有实现，缺少一个查询功能，还有一些BUG,此系统供大家参考，如若想要此系统源码附带样本数据库及操作指南，请点击下面链接下载，拒绝白嫖，从我做起。

链接: link.

大学生数据库课程设计之学生选课系统（一个超级简单的系统)相关推荐

Java 课程设计_学生选课管理系统（控制台）
Java 课程设计_学生选课管理系统需求分析本数据库的用户主要是学生,通过对用户需求的收集和分析,获得用户对数据库的如下要求. 1.信息需求学生信息:学号,姓名,性别,专业登陆信息:账号,密码 ...
【数据库课程设计】SQLServer数据库课程设计（学生宿舍管理），课设报告+源码+数据库关系图
数据库课程设计--学生宿舍管理,需要全部源码可以关注私信我,把邮箱发在评论区前言一.课题背景和开发环境 1.课题背景 2.开发环境二.系统功能及示意图 1.系统实现功能 2.功能示意图 2.1学 ...
数据库课程设计报告-学生学籍管理信息系统
1.概述 1.1 项目背景随着我国教育体制改革的深入进行,教育系统得到了前所未有的发展.学生管理正在逐步迈向管理信息现代化.但是我国的学生管理信息化水平还处在初级阶段,主要表现在对学生的学籍信息管理 ...
oracle学生考勤,Oracle数据库课程设计――学生考勤系统的Oracle实现1
Oracle数据库课程设计――学生考勤系统的Oracle实现1 辽宁工程技术大学 Oracle数据库课程设计报告学生考勤系统姓名: XXXXX 班级: 计SJ08-1班学号: 完成日期: ...
数据库课程设计个人总结报告
数据库课程设计个人总结报告在大二上学期的16周周四,我们小组完成了数据库课程设计,本次课程设计我们小组总共四个人,虽然没有明确谁是组长,但是我感觉分工合作的效率还是挺高的,比预期更快的完成了任务.作 ...
学生选课系统数据库课程设计
数据库课程设计报告设计题目学生选课系统专业计算机科学与技术班级计1101 学号姓名寸利芳 ...
数据库课程设计----学生信息与选课、成绩评价管理系统
目录一.需求分析 4 二.概念设计 5 2.1 概念模型(E-R图) 6 2.2 数据字典 6 三.逻辑结构设计 5 3.1 关系模式 6 3.2 系统结构图 6 四.物理设计 5 4.1 存储安排 ...
查询学生选修课程管理系统java_JAVA数据库课程设计学生选课管理系统的
<JAVA数据库课程设计学生选课管理系统的>由会员分享,可在线阅读,更多相关<JAVA数据库课程设计学生选课管理系统的(59页珍藏版)>请在人人文库网上搜索. 1.一.课程设计 ...
数据库课程设计————学生考试系统
1.敲代码前的准备工作 1.1准备开发工具 1.1.1 开发工具的说明本系统利用了xampp 集成环境,利用PHP写后端,html.css.js写前端(其实笔者也是现学现卖) 1.1.2 xampp ...

大学生数据库课程设计之学生选课系统（一个超级简单的系统)