軟件：SQL Server；Visual Studio
語言：C#，SQL
兩個身份，管理員和學(xué)生。
管理員功能：管理學(xué)生專業(yè)信息、課程信息、選課信息（增刪改查），查看已注冊過的同學(xué)信息（密碼不可見，是亂碼）以及照片。
學(xué)生功能：注冊自己的信息，查看自己的信息包括專業(yè)信息、注冊時的信息、選課及成績，修改自己的密碼。

在SQL Server創(chuàng)建數(shù)據(jù)庫，在新數(shù)據(jù)庫中新建需要用的表并添加數(shù)據(jù)。

create database curricula_variable_system;//創(chuàng)建數(shù)據(jù)庫USE curricula_variable_system; //建表，記錄注冊信息的 CREATE TABLE SysUser ( UserID NCHAR(20) , UserPassWord NCHAR(32) , /*密碼32位加密*/ UserSchoolID NCHAR(20) PRIMARY KEY,UserMobile NCHAR(11),UserBirthday datetime,UserIdentity NCHAR(20),UserPhoto image); //建表，記錄登錄信息的CREATE TABLE SysLog ( UserID NCHAR(20) , DateAndTime datetime,UserOperation NCHAR(200)); //建管理員表，存管理員的賬號密碼CREATE TABLE Teacher ( UserID NCHAR(20) , UserPassWord NCHAR(32) , /*密碼32位加密*/ );//建學(xué)生表CREATE TABLE Student ( Sno CHAR(9) PRIMARY KEY, /* 列級完整性約束條件,Sno是主碼*/ Sname CHAR(20) UNIQUE, /* Sname取唯一值*/Ssex CHAR(2),Sage SMALLINT,Sdept CHAR(20)); //課程表 CREATE TABLE Course( Cno CHAR(4) PRIMARY KEY,Cname CHAR(40), Cpno CHAR(4), Ccredit SMALLINT,FOREIGN KEY (Cpno) REFERENCES Course(Cno) ); //選課表CREATE TABLE SC(Sno CHAR(9), Cno CHAR(4), Grade SMALLINT,PRIMARY KEY (Sno,Cno), /* 主碼由兩個屬性構(gòu)成，必須作為表級完整性進(jìn)行定義*/FOREIGN KEY (Sno) REFERENCES Student(Sno), /* 表級完整性約束條件，Sno是外碼，被參照表是Student */FOREIGN KEY (Cno)REFERENCES Course(Cno) /* 表級完整性約束條件， Cno是外碼，被參照表是Course*/); //插入數(shù)據(jù) INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215121','李勇','男','CS',20); INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215122','劉晨','女','CS',19); INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215123','王敏','女','MA',18); INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215125','張立','男','IS',19); INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215128','陳冬','男','IS',20);INSERT INTO Course(Cno,Cname,Cpno,Ccredit) VALUES ('1','數(shù)據(jù)庫',NULL,4); INSERT INTO Course(Cno,Cname,Cpno,Ccredit) VALUES ('2','數(shù)學(xué)',NULL,4); INSERT INTO Course(Cno,Cname,Cpno,Ccredit) VALUES ('3','信息系統(tǒng)',NULL,4); INSERT INTO Course(Cno,Cname,Cpno,Ccredit) VALUES ('4','操作系統(tǒng)',NULL,4); INSERT INTO Course(Cno,Cname,Cpno,Ccredit) VALUES ('5','數(shù)據(jù)結(jié)構(gòu)',NULL,4); INSERT INTO Course(Cno,Cname,Cpno,Ccredit) VALUES ('6','數(shù)據(jù)處理',NULL,4); INSERT INTO Course(Cno,Cname,Cpno,Ccredit) VALUES ('7','Pascal語言',NULL,4); UPDATE Course SET Cpno = '5' WHERE Cno = '1' UPDATE Course SET Cpno = '1' WHERE Cno = '3' UPDATE Course SET Cpno = '6' WHERE Cno = '4' UPDATE Course SET Cpno = '7' WHERE Cno = '5' UPDATE Course SET Cpno = '6' WHERE Cno = '7' INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','1',92); INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','2',85); INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','3',88); INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215122 ','2',90); INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215122 ','3',80);//新建觸發(fā)器 CREATE TRIGGER regist_recorder ON SysUser AFTER INSERT AS declare @UserName nchar(20)declare @DateTime datetimedeclare @UserOperation nchar(200)select @UserName = system_userselect @DateTime = CONVERT(datetime,GETDATE(),120) declare @op varchar(10)select @op=case when exists(select 1 from inserted) and exists(select 1 from deleted)then 'Update'when exists(select 1 from inserted) and not exists(select 1 from deleted)then 'Insert'when not exists(select 1 from inserted) and exists(select 1 from deleted)then 'Delete' end select @UserOperation = @op INSERT INTO SysLog(UserID,DateAndTime,UserOperation)VALUES (@UserName,@DateTime,@UserOperation)

剛開始的登錄頁面

點擊按鈕顯示新的窗體，這是其中一個按鈕的代碼。

Form2 form2 = new Form2();//新建窗體 form2.Show();//顯示新建窗體 this.Hide();//隱藏當(dāng)前窗體

確定登錄

string username = textBoxtea.Text.Trim(); //取出賬號string password = EncryptWithMD5(textBoxcher.Text.Trim()); //取出密碼并加密string myConnString = "Data Source=.;Initial Catalog=curricula_variable_system;Persist Security Info=True;User ID=sa;Password=sql";//連接數(shù)據(jù)庫SqlConnection sqlConnection = new SqlConnection(myConnString); //實例化連接對象sqlConnection.Open();string sql = "select UserID,UserPassWord from Teacher where UserID = '" + username + "' and UserPassWord = '" + password + "'"; //教工號：201210，密碼：123//編寫SQL命令SqlCommand sqlCommand = new SqlCommand(sql, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();if (sqlDataReader.HasRows && textBoxyan.Text == code){MessageBox.Show("歡迎使用！"); //登錄成功Form6 form6 = new Form6();form6.Show();this.Hide();}else{MessageBox.Show("登錄失敗！");return;}sqlDataReader.Close(); sqlConnection.Close();

密碼加密

public static string EncryptWithMD5(string source){byte[] sor = Encoding.UTF8.GetBytes(source);MD5 md5 = MD5.Create();byte[] result = md5.ComputeHash(sor);StringBuilder strbul = new StringBuilder(40);for (int i = 0; i < result.Length; i++){strbul.Append(result[i].ToString("x2"));//加密結(jié)果"x2"結(jié)果為32位,"x3"結(jié)果為48位,"x4"結(jié)果為64位}return strbul.ToString();}

驗證碼
點擊窗體|在事件里找Load|雙擊，然后輸入以下代碼

public string code; //隨機實例化 Random ran = new Random();int number;char code1;//取五個數(shù) for (int i = 0; i < 5; i++){number = ran.Next();if (number % 2 == 0)code1 = (char)('0' + (char)(number % 10));elsecode1 = (char)('A' + (char)(number % 26)); //轉(zhuǎn)化為字符 this.code += code1.ToString();}label5.Text = code;

查看照片，根據(jù)學(xué)號查看

try{string connString = "Data Source=.;Initial Catalog=curricula_variable_system;Persist Security Info=True;User ID=sa;Password=sql";//數(shù)據(jù)庫連接字符串SqlConnection connection = new SqlConnection(connString);//創(chuàng)建connection對象//打開數(shù)據(jù)庫連接connection.Open();//創(chuàng)建SQL語句string sql = "select UserPhoto from SysUser where UserSchoolID = '" + textBox1.Text + "'";//創(chuàng)建SqlCommand對象SqlCommand command = new SqlCommand(sql, connection);//創(chuàng)建DataAdapter對象SqlDataAdapter dataAdapter = new SqlDataAdapter(command);//創(chuàng)建DataSet對象DataSet dataSet = new DataSet();dataAdapter.Fill(dataSet, "SysUser");int c = dataSet.Tables["SysUser"].Rows.Count;if (c > 0){Byte[] mybyte = new byte[0];mybyte = (Byte[])(dataSet.Tables["SysUser"].Rows[c - 1]["UserPhoto"]);MemoryStream ms = new MemoryStream(mybyte);pictureBox2.Image = Image.FromStream(ms);}else{pictureBox2.Image = null;MessageBox.Show("無照片");} connection.Close();}catch (Exception ex){MessageBox.Show(ex.Message);}

返回上一界面

Form6 form6 = new Form6();//上一界面的窗體form6.Show();//顯示this.Hide();//隱藏當(dāng)前窗體

我對性別的填寫進(jìn)行了限定只能是”男“或“女”。學(xué)號也限定是201215開頭再加三位數(shù)字。
SQL語句如下

alter table Student add constraint c1 check(Sno between 201215000 and 201215999) alter table Student add constraint c2 check(Ssex IN('男','女'))

刪除

SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{con.Open();string select_id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();//選擇的當(dāng)前行第一列的值，也就是IDstring delete_by_id = "delete from Student where Sno=" + select_id;//sql刪除語句SqlCommand cmd = new SqlCommand(delete_by_id, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("請正確選擇行!");}finally{con.Dispose();}this.studentTableAdapter.Fill(this.curricula_variable_systemDataSet3.Student);//Form10_Load里的那條代碼

修改，根據(jù)學(xué)號修改姓名

String StuID = textBox1.Text.Trim();String StuName = textBox2.Text.Trim();SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{con.Open();string insertStr = "UPDATE Student SET Sname = '" + StuName + "' WHERE Sno = '" + StuID + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("輸入數(shù)據(jù)違反要求!");}finally{con.Dispose();}this.studentTableAdapter.Fill(this.curricula_variable_systemDataSet3.Student);//Form10_Load里的那條代碼

查詢，根據(jù)學(xué)號

String StuID = textBox1.Text.Trim();String conn = "Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql";SqlConnection sqlConnection = new SqlConnection(conn); //實例化連接對象try{sqlConnection.Open();String select_by_id = "select * from Student where Sno='" + StuID + "'";SqlCommand sqlCommand = new SqlCommand(select_by_id, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();BindingSource bindingSource = new BindingSource();bindingSource.DataSource = sqlDataReader;dataGridView1.DataSource = bindingSource;}catch{MessageBox.Show("查詢語句有誤，請認(rèn)真檢查SQL語句!");}finally{sqlConnection.Close();}

清空文本行

textBox1.Text = null;textBox2.Text = null;textBox3.Text = null;textBox4.Text = null;textBox5.Text = null;

添加課程

string Coucno = textBox1.Text.Trim();string Couname = textBox2.Text.Trim();string Coucredit = textBox3.Text.Trim();string Coupno = textBox4.Text.Trim(); SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{con.Open();//打開string insertStr = "INSERT INTO Course (Cno,Cname,Cpno,Ccredit) " +"VALUES ('" + Coucno + "','" + Couname + "','" + Coupno + "','" + Coucredit + "')";SqlCommand cmd = new SqlCommand(insertStr, con);//使用cmd.ExecuteNonQuery();}catch{MessageBox.Show("輸入數(shù)據(jù)違反要求!");}finally{con.Dispose();//釋放} this.courseTableAdapter.Fill(this.curricula_variable_systemDataSet4.Course);

刪除

SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{con.Open();string select_id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();//選擇的當(dāng)前行第一列的值，也就是Cno那列string delete_by_id = "delete from Course where Cno=" + select_id;//sql刪除語句SqlCommand cmd = new SqlCommand(delete_by_id, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("請正確選擇行!");}finally{con.Dispose();}this.courseTableAdapter.Fill(this.curricula_variable_systemDataSet4.Course);

修改，根據(jù)課程號修改課程名

string Cno = textBox1.Text.Trim();string Cname = textBox2.Text.Trim();SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{con.Open();string insertStr = "UPDATE Course SET Cname = '" + Cname + "' WHERE Cno = '" + Cno + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("輸入數(shù)據(jù)違反要求!");}finally{con.Dispose();}this.courseTableAdapter.Fill(this.curricula_variable_systemDataSet4.Course);

查詢，根據(jù)課程號

string Cno = textBox1.Text.Trim();String conn = "Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql";SqlConnection sqlConnection = new SqlConnection(conn); //實例化連接對象try{sqlConnection.Open();String select_by_id = "select * from Course where Cno='" + Cno + "'";SqlCommand sqlCommand = new SqlCommand(select_by_id, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();BindingSource bindingSource = new BindingSource();bindingSource.DataSource = sqlDataReader;dataGridView1.DataSource = bindingSource;}catch{MessageBox.Show("查詢語句有誤，請認(rèn)真檢查SQL語句!");}finally{sqlConnection.Close();}

查詢

string StuID = textBox1.Text.Trim();String conn = "Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql";SqlConnection sqlConnection = new SqlConnection(conn); //實例化連接對象try{sqlConnection.Open();String select_by_id = "select * from SC where Sno='" + StuID + "'";SqlCommand sqlCommand = new SqlCommand(select_by_id, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();BindingSource bindingSource = new BindingSource();bindingSource.DataSource = sqlDataReader;dataGridView1.DataSource = bindingSource;}catch{MessageBox.Show("查詢語句有誤，請認(rèn)真檢查SQL語句!");}finally{sqlConnection.Close();}

修改，根據(jù)學(xué)號、課程號修改成績

string StuID = textBox1.Text.Trim();string Cno = textBox2.Text.Trim();string Grade = textBox3.Text.Trim();SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{con.Open();string insertStr = "UPDATE SC SET Grade = '" + Grade + "' WHERE Cno = '" + Cno + "'AND Sno='"+ StuID+"'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("輸入數(shù)據(jù)違反要求!");}finally{con.Dispose();}this.sCTableAdapter2.Fill(this.curricula_variable_systemDataSet7.SC);

添加

string StuID = textBox1.Text.Trim();string Cno = textBox2.Text.Trim();string Grade = textBox3.Text.Trim();SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{string stu = "select Sno from Student where Sno='" + StuID + "'";if (stu != ""){con.Open();//打開string insertStr = "INSERT INTO SC (Sno,Cno,Grade) " +"VALUES ('" + StuID + "','" + Cno + "','" + Grade + "')";SqlCommand cmd = new SqlCommand(insertStr, con);//使用cmd.ExecuteNonQuery();}else{MessageBox.Show("沒有該學(xué)生！請重新輸入");} }catch{MessageBox.Show("輸入數(shù)據(jù)違反要求!");//新加的學(xué)號在已有學(xué)號中,課程號在已有的課程中，成績在0到100之間}finally{con.Dispose();//釋放}this.sCTableAdapter2.Fill(this.curricula_variable_systemDataSet7.SC);

刪除，輸入學(xué)號、課程號刪除對應(yīng)行。因為選課表是學(xué)號課程號一起作為主碼的所以和前邊的刪除方式不同。

SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql");//定義try{con.Open();string StuID = textBox1.Text.Trim();string Cno = textBox2.Text.Trim();string delete_by_stc= "delete from SC where Sno='"+ textBox1.Text + "' and Cno='" + textBox2.Text + "'";SqlCommand cmd = new SqlCommand(delete_by_stc, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("請正確選擇行!");}finally{con.Dispose();}this.sCTableAdapter2.Fill(this.curricula_variable_systemDataSet7.SC);

查看專業(yè)信息（查看專業(yè)信息代碼類似，就是SQL語句那改成SC表)

String conn = "Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql";SqlConnection sqlConnection = new SqlConnection(conn); //實例化連接對象String StuID = textBox1.Text.Trim();if(textBox1.Text==""){MessageBox.Show("請先輸入學(xué)號!");return;}else{try{sqlConnection.Open();String select_by_id = "select * from Student where Sno='" + StuID + "'";SqlCommand sqlCommand = new SqlCommand(select_by_id, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();BindingSource bindingSource = new BindingSource();bindingSource.DataSource = sqlDataReader;dataGridView1.DataSource = bindingSource;}catch{MessageBox.Show("查詢語句有誤，請認(rèn)真檢查SQL語句!");}finally{sqlConnection.Close();}}

查看個人信息

String StuID = textBox1.Text.Trim();String conn1 = "Data Source=.;Initial Catalog=curricula_variable_system;User ID=sa;Password=sql";SqlConnection sqlConnection1 = new SqlConnection(conn1); //實例化連接對象if (textBox1.Text == ""){MessageBox.Show("請先輸入學(xué)號!");return;}else{ try{sqlConnection1.Open();String select_by_id1 = "select UserID,UserSchoolID,UserMobile,UserBirthday,UserIdentity from SysUser where UserSchoolID='" + StuID + "'";SqlCommand sqlCommand = new SqlCommand(select_by_id1, sqlConnection1);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();BindingSource bindingSource = new BindingSource();bindingSource.DataSource = sqlDataReader;dataGridView1.DataSource = bindingSource;}catch{MessageBox.Show("查詢語句有誤，請認(rèn)真檢查SQL語句!");}finally{sqlConnection1.Close();}}

查看照片

if (textBox1.Text == ""){MessageBox.Show("請先輸入學(xué)號!");return;}else{try{string connString = "Data Source=.;Initial Catalog=curricula_variable_system;Persist Security Info=True;User ID=sa;Password=sql";//數(shù)據(jù)庫連接字符串SqlConnection connection = new SqlConnection(connString);//創(chuàng)建connection對象//打開數(shù)據(jù)庫連接connection.Open();//創(chuàng)建SQL語句string sql = "select UserPhoto from SysUser where UserSchoolID = '" + textBox1.Text + "'";//創(chuàng)建SqlCommand對象SqlCommand command = new SqlCommand(sql, connection);//創(chuàng)建DataAdapter對象SqlDataAdapter dataAdapter = new SqlDataAdapter(command);//創(chuàng)建DataSet對象DataSet dataSet = new DataSet();dataAdapter.Fill(dataSet, "SysUser");int c = dataSet.Tables["SysUser"].Rows.Count;if (c > 0){Byte[] mybyte = new byte[0];mybyte = (Byte[])(dataSet.Tables["SysUser"].Rows[c - 1]["UserPhoto"]);MemoryStream ms = new MemoryStream(mybyte);pictureBox2.Image = Image.FromStream(ms);}elsepictureBox2.Image = null;connection.Close();}catch (Exception ex){MessageBox.Show(ex.Message);}}

修改密碼

確定修改，使用正則表達(dá)式約束新密碼的格式

if (textBox3.Text == ""){MessageBox.Show("學(xué)號不能為空！");}if(textBox1.Text==""){MessageBox.Show("新密碼不能為空！");}if (textBox2.Text == ""){MessageBox.Show("確認(rèn)密碼不能為空！");}if(textBox1.Text.Trim()!="")//新密碼不為空時，輸入滿足正則表達(dá)式{//使用regex（正則表達(dá)式）進(jìn)行格式設(shè)置 至少有數(shù)字、大寫字母、小寫字母各一個。最少3個字符、最長20個字符。Regex regex = new Regex(@"(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{3,20}");if (regex.IsMatch(textBox1.Text))//判斷格式是否符合要求{//MessageBox.Show("輸入密碼格式正確!");}else{MessageBox.Show("至少有數(shù)字、大寫字母、小寫字母各一個。最少3個字符、最長20個字符！");return;}}if (textBox1.Text == textBox2.Text){string sql = "update SysUser set UserPassWord='"+ EncryptWithMD5(textBox1.Text)+"' where UserSchoolID='"+ textBox3.Text.Trim()+"'";string connString = "Data Source=.;Initial Catalog=curricula_variable_system;Persist Security Info=True;User ID=sa;Password=sql";SqlConnection con = new SqlConnection(connString);//創(chuàng)建connection對象con.Open();SqlCommand command = new SqlCommand(sql, con);command.ExecuteNonQuery();MessageBox.Show("新密碼已經(jīng)修改完成"); con.Close();}else{MessageBox.Show("請輸入兩次相同的密碼");}

對密碼加密

public static string EncryptWithMD5(string source){byte[] sor = Encoding.UTF8.GetBytes(source);MD5 md5 = MD5.Create();byte[] result = md5.ComputeHash(sor);StringBuilder strbul = new StringBuilder(40);for (int i = 0; i < result.Length; i++){strbul.Append(result[i].ToString("x2"));//加密結(jié)果"x2"結(jié)果為32位,"x3"結(jié)果為48位,"x4"結(jié)果為64位}return strbul.ToString();}

主要代碼都在上面了，參考的時候結(jié)合自己的稍加改動就可以，背景圖片是pictureBox組件然后選自己喜歡的照片就可以了，注意一下大小模式這里，選這個圖片才顯示完整。
所有代碼我壓縮放在github上了，需要的可以下載然后在Visual studio打開看一下點這里

視頻講解：點這里

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