目录

利用SQL Sever和 VS C#实现

一、程序流程图

二、具体实现：利用SQL Sever和 VS实现，使用C#连接数据库

1、新建一个名为MySchool的数据库​​​​​​​

2、C#连接数据库，并实现对MySchool数据库的增、删、改、查操作

（1）主界面

（2）学生登录页面

（3）个人主页

（4）注册页面

（5）管理员登录页面

（6）管理员主页

（7）登录日志页面

（8）学生信息页面

（9）课程信息页面

（10）学生成绩信息页面

（11）成绩统计页面

（12）在主界面点击右上角的“×”即退出系统。

利用SQL Sever和 VS C#实现

一、程序流程图

图1：程序流程图

二、具体实现：利用SQL Sever和 VS实现，使用C#连接数据库

1、新建一个名为MySchool的数据库

（1）首先，连接数据库，一定一定要选择“SQL Sever身份验证”方式建立连接，不懂怎么用这种方式连接的可以自行搜索一下，很简单。

图2：数据库连接

（2）新建一个名为“MySchool”的数据库，其中含有的表如下：

图3：MySchool数据库

对应的SQL语句如下：

USE MySchool;DROP TABLE IF EXISTS SC /*成绩*/DROP TABLE IF EXISTS Student /*学生信息*/DROP TABLE IF EXISTS Course /*课程*/DROP TABLE IF EXISTS StudentUser /*学生用户信息*/DROP TABLE IF EXISTS Administrator /*管理员用户信息*/DROP TABLE IF EXISTS SysLog /*注册日志*/DROP TABLE IF EXISTS SysLog1 /*登陆日志*/DROP TABLE IF EXISTS AVG1 /*登陆日志*/CREATE TABLE StudentUser(ID NCHAR(20) PRIMARY KEY,/*学号*/ PassWord NCHAR(32) ,/*密码*/Sex CHAR(2) ,/*性别*/Birthday datetime,/*生日*/UserMobile NCHAR(11),/*电话号码*/); CREATE TABLE Administrator(ID NCHAR(20) PRIMARY KEY,/*工号*/ PassWord NCHAR(32) , /*密码*/Sex CHAR(2),/*性别*/Birthday datetime,/*生日*/UserMobile NCHAR(11),/*电话号码*/);CREATE TABLE SysLog([UserMobile]UserID NCHAR(20) , /*id*/dentity CHAR(20), /*学生或管理员*/DateAndTime datetime, /*注册时间*/UserOperation NCHAR(200) /*操作方式*/); CREATE TABLE SysLog1(UserID NCHAR(20) , /*id*/dentity CHAR(20), /*学生或管理员*/DateAndTime datetime, /*登陆时间*/UserOperation NCHAR(200) /*登陆操作方式*/);CREATE TABLE Student(Sno CHAR(9) PRIMARY KEY, /* 列级完整性约束条件,Sno是主码*/ Sname CHAR(20) UNIQUE, /* Sname取唯一值*/Ssex CHAR(2),/*性别*/Sage SMALLINT,/*年龄*/Sdept CHAR(20)/*专业*/); CREATE TABLE Course(Cno CHAR(4) PRIMARY KEY,Cname CHAR(40), Cpno CHAR(4), Ccredit SMALLINT, ); CREATE TABLE SC(Sno CHAR(9), Cno CHAR(4), Grade SMALLINT,PRIMARY KEY (Sno,Cno), /* 主码由两个属性构成，必须作为表级完整性进行定义*/FOREIGN KEY (Sno) REFERENCES Student(Sno), /* 表级完整性约束条件，Sno是外码，被参照表是Student */FOREIGN KEY (Cno)REFERENCES Course(Cno)/* 表级完整性约束条件， Cno是外码，被参照表是Course*/); INSERT INTO StudentUser VALUES ('1101111','123456','女',1999-1-1,'13812345678',NULL);INSERT INTO Administrator VALUES ('110',substring(sys.fn_sqlvarbasetostr(HashBytes('MD5','123456')),3,32),'女',1989-1-1,'13812345687',NULL);INSERT INTO Administrator VALUES ('111',substring(sys.fn_sqlvarbasetostr(HashBytes('MD5','123456')),3,32),'女',1989-2-1,'13812655687',NULL);INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('15121','李勇','男','CS',20);INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('15122','刘晨','女','CS',19);INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('15123','王敏','女','MA',18);INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('15125','张立','男','IS',19);INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('15128','陈冬','男','IS',20);SELECT * FROM StudentINSERT INTO Course(Cno,Cname,Cpno,Ccredit)VALUES ('1','数据库',NULL,4);INSERT INTO Course(Cno,Cname,Cpno,Ccredit)VALUES ('2','数学',NULL,4);INSERT INTO Course(Cno,Cname,Cpno,Ccredit)VALUES ('3','信息系统',NULL,4);INSERT INTO Course(Cno,Cname,Cpno,Ccredit)VALUES ('4','操作系统',NULL,4);INSERT INTO Course(Cno,Cname,Cpno,Ccredit)VALUES ('5','数据结构',NULL,4);INSERT INTO Course(Cno,Cname,Cpno,Ccredit)VALUES ('6','数据处理',NULL,4);INSERT INTO Course(Cno,Cname,Cpno,Ccredit)VALUES ('7','Pascal语言',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' SELECT * FROM CourseINSERT INTO SC(Sno,Cno,Grade) VALUES ('15121 ','1',92);INSERT INTO SC(Sno,Cno,Grade) VALUES ('15121 ','2',85);INSERT INTO SC(Sno,Cno,Grade) VALUES ('15121 ','3',88);INSERT INTO SC(Sno,Cno,Grade) VALUES ('15122 ','2',90);INSERT INTO SC(Sno,Cno,Grade) VALUES ('15122 ','3',80);SELECT * FROM SC--当学生用户信息更新，触发器启动，将更新的内容存至注册日志IF(OBJECT_ID('regist_recorder1') is not null) -- 判断名为 regist_recorder 的触发器是否存在DROP TRIGGER regist_recorder1 -- 删除触发器GOCREATE TRIGGER regist_recorder1ON StudentUser AFTERINSERTAS declare @UserName nchar(20)declare @DateTime datetimedeclare @UserOperation nchar(200)declare @dentity CHAR(20)select @UserName = ID FROM StudentUserselect @DateTime = CONVERT(datetime,GETDATE(),120) select @dentity ='StudentUser'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' endselect @UserOperation = @opINSERT INTO SysLog(UserID,dentity,DateAndTime,UserOperation)VALUES (@UserName,@dentity,@DateTime,@UserOperation)--当管理员信息更新，触发器启动，将更新的内容存至注册日志IF(OBJECT_ID('regist_recorder2') is not null) -- 判断名为 regist_recorder 的触发器是否存在DROP TRIGGER regist_recorder2 -- 删除触发器GOCREATE TRIGGER regist_recorder2ON AdministratorAFTERINSERTAS declare @UserName nchar(20)declare @DateTime datetimedeclare @UserOperation nchar(200)declare @dentity CHAR(20)select @UserName = ID FROM Administratorselect @DateTime = CONVERT(datetime,GETDATE(),120) select @dentity ='Administrator'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' endselect @UserOperation = @opINSERT INTO SysLog(UserID,dentity,DateAndTime,UserOperation)VALUES (@UserName,@dentity,@DateTime,@UserOperation)--建一个表存储各科平均分--建一个表存储各科平均分CREATE TABLE AVG1(Cname CHAR(10), /* 科目*/avg1 INT);INSERT INTO AVG1(Cname,avg1)VALUES ('数据库',NULL);INSERT INTO AVG1(Cname,avg1)VALUES ('数学',NULL);INSERT INTO AVG1(Cname,avg1)VALUES ('信息系统',NULL);INSERT INTO AVG1(Cname,avg1)VALUES ('操作系统',NULL);INSERT INTO AVG1(Cname,avg1)VALUES ('数据结构',NULL);INSERT INTO AVG1(Cname,avg1)VALUES ('数据处理',NULL);INSERT INTO AVG1(Cname,avg1)VALUES ('Pascal语言',NULL);--将成绩信息通过下列存储过程算出各科平均分并存储至AVG表IF (exists (select * from sys.objects where name = 'COURSE_AVG1'))DROP PROCEDURE COURSE_AVG1GOCREATE PROCEDURE COURSE_AVG1ASBEGIN TRANSACTION TRANS DECLARE @SX INT, /* 数学总分 */@XXXT INT, /* 信息系统总分 */@CZXT INT, /* 操作系统总分 */@SJJG INT, /* 数据结构总分 */@SJK_C INT, /* 数据库总分 */@SJCL INT, /*数据处理总分*/@P INT /*Pascal语言*/SELECT @SX=AVG(Grade) FROM SCWHERE Cno='2 'SELECT @XXXT=AVG(Grade) FROM SCWHERE Cno='3'SELECT @CZXT=AVG(Grade) FROM SCWHERE Cno='4'SELECT @SJJG=AVG(Grade) FROM SCWHERE Cno='5'SELECT @SJK_C=AVG(Grade) FROM SCWHERE Cno='1'SELECT @SJCL=AVG(Grade) FROM SCWHERE Cno='6'SELECT @P=AVG(Grade) FROM SCWHERE Cno='7'BEGIN UPDATE AVG1 SET avg1=@SJK_C WHERE Cname='数据库'UPDATE AVG1 SET avg1=@SX WHERE Cname='数学'UPDATE AVG1 SET avg1=@XXXT WHERE Cname='信息系统'UPDATE AVG1 SET avg1=@CZXT WHERE Cname='操作系统'UPDATE AVG1 SET avg1=@SJJG WHERE Cname='数据结构'UPDATE AVG1 SET avg1=@SJCL WHERE Cname='数据处理'UPDATE AVG1 SET avg1=@P WHERE Cname='Pascal语言'COMMIT TRANSACTION TRANS; END

2、C#连接数据库，并实现对MySchool数据库的增、删、改、查操作

（1）主界面：主界面包含欢迎文本和两个可选项，如下图3所示分别为“学生登录”和“管理员登录”，选择不同的选项则分别进入不同的页面。

图4：主界面

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class FormLogin : Form{public FormLogin(){InitializeComponent();}private void buttonStuLogin_Click(object sender, EventArgs e){FormStuLogin FormStuLogin = new FormStuLogin(); //学生登录窗体FormStuLogin.Show();//跳转至学生登录窗体this.Hide(); //隐藏原窗体}private void buttonManagerLogin_Click(object sender, EventArgs e){FormManagerLogin FormManagerLogin = new FormManagerLogin(); //管理员登录窗体FormManagerLogin.Show();//跳转至管理员登录窗体this.Hide();}private void FormLogin_FormClosing_1(object sender, FormClosingEventArgs e){}private void FormLogin_FormClosed(object sender, FormClosedEventArgs e){while (MessageBox.Show("即将退出系统，您确认退出吗？", "提示！", MessageBoxButtons.YesNo)== DialogResult.Yes){System.Environment.Exit(System.Environment.ExitCode);}}}}

（2）学生登录页面：在主界面选择学生登录按钮则进入学生登录页面，页面功能如下图所示。若用户有该系统的账号，则可选择直接登录：先输入用户名，密码以及验证码，三者均正确才能登陆成功。

图5：学生登录页面

图6：学生登录成功

若其中一项不正确则会弹窗提示你重新输入，如下图所示：

图7：学生登录失败

对应C#实现如下（连接数据库的代码实现部分大家根据自身情况自行修改，下同）：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class FormStuLogin : Form{public FormStuLogin(){InitializeComponent();}public string code;private string EncryptWithMD5(string source)//MD5加密{byte[] sor = Encoding.UTF8.GetBytes(source);MD5 md5 = MD5.Create();byte[] result = puteHash(sor);StringBuilder strbul = new StringBuilder(40);for (int i = 0; i < result.Length; i++){strbul.Append(result[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位}return strbul.ToString();}private void buttonLogin_Click(object sender, EventArgs e){string username = tBUserName.Text.Trim(); //取出账号string password = EncryptWithMD5(tBPassword.Text.Trim()); //取出密码并加密string myConnString = "Data Source=.;Initial Catalog=MySchool;Persist Security Info=True;User ID=sa;Password=yourpassword";SqlConnection sqlConnection = new SqlConnection(myConnString); //实例化连接对象sqlConnection.Open();string sql = "select ID,PassWord from StudentUser where ID = '" + username + "' and PassWord = '" + password + "'"; //编写SQL命令SqlCommand sqlCommand = new SqlCommand(sql, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();//读取数据if (sqlDataReader.HasRows && tBVerifyCode.Text == code)//验证是否有该用户及密码且验证码正确{MessageBox.Show("欢迎使用！"); //登录成功StuMain stuMain = new StuMain();stuMain.GetId(username);stuMain.Show();//显示下一界面this.Hide();}else if (sqlDataReader.HasRows && tBVerifyCode.Text != code){MessageBox.Show("验证码错误，登录失败！");return;}else{MessageBox.Show("账号密码有误，登录失败！");return;}sqlDataReader.Close();sql = "insert into SysLog1 values ( '" + username + "' , 'Student','" + DateTime.Now + "' , '" + "Login" + "')"; //编写SQL命令,把登陆信息存入登录日志SqlCommand sqlCommand1 = new SqlCommand(sql, sqlConnection);sqlCommand1.ExecuteNonQuery();sqlConnection.Close();}private void buttonReg_Click(object sender, EventArgs e){this.Hide();RegisterForm registerForm = new RegisterForm();registerForm.Show();}private void FormStuLogin_Load_1(object sender, EventArgs e){//随机实例化 Random ran = new Random();int number;char code1;//取五个数 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)); //转化为字符 this.code += code1.ToString();}lbVerifyCode.Text = code;}private void lbVerifyCode_Click(object sender, EventArgs e){}private void buttonCancel_Click_1(object sender, EventArgs e){this.Close();}private void FormStuLogin_FormClosing_1(object sender, FormClosingEventArgs e){FormLogin m2 = new FormLogin();m2.Show();}private void lbPassword_Click(object sender, EventArgs e){}}}

（3）个人主页：学生用户若成功登录则进入个人主页，个人主页共包含“个人基本信息”和“成绩单”两个分页，所展示的信息如下图所示，学生能够看到自己的个人信息和个人成绩，以及各门课程的详细信息。

图8：个人主页——个人信息页

图9：个人主页——成绩单页

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class StuMain : Form{public StuMain(){InitializeComponent();}private void buttonExit_Click(object sender, EventArgs e){this.Close();}string Id;public void GetId(string id)//上个窗体调用此函数，将id值传过来{lbStuId.Text = id;lbStuId.Refresh();Id = id;}private void StuMain_Load_1(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“mySchoolDataSet.Course”中。您可以根据需要移动或移除它。this.courseTableAdapter.Fill(this.mySchoolDataSet.Course);string name, sex, dept, tel;int age;string connString = "Data Source=.;Initial Catalog=MySchool;Persist Security Info=True;User ID=sa;Password=yourpassword";//数据库连接字符串SqlConnection conn = new SqlConnection(connString);//创建connection对象conn.Open();//打开数据库 //创建数据库命令 SqlCommand cmd = conn.CreateCommand();//创建查询语句 mandText = "select * from Student where Sno = '" + Id + "';select * from StudentUser where ID = '" + Id + "'";//从数据库中读取数据流存入reader中 SqlDataReader reader = cmd.ExecuteReader();//从reader中读取下一行数据,如果没有数据,reader.Read()返回flase while (reader.Read()){name = reader.GetString(reader.GetOrdinal("Sname"));sex = reader.GetString(reader.GetOrdinal("Ssex"));age = reader.GetInt16(reader.GetOrdinal("Sage"));dept = reader.GetString(reader.GetOrdinal("Sdept"));lbStuName.Text = name;lbStuName.Refresh();lbStuSex.Text = sex;lbStuAge.Text = age.ToString();lbStuDept.Text = dept;break;}reader.NextResult();//执行下一句操作//从reader中读取下一行数据,如果没有数据,reader.Read()返回flase while (reader.Read()){tel = reader.GetString(reader.GetOrdinal("UserMobile"));lbPhone.Text = tel;break;}reader.Close();SqlDataAdapter dap = new SqlDataAdapter("select * from SC where Sno='" + Id + "'", conn);//查询DataSet ds = new DataSet();//创建DataSet对象dap.Fill(ds);//填充DataSet数据集dataGridView1.DataSource = ds.Tables[0].DefaultView;//显示查询后的数据conn.Close();int i = 0;int x = 0, h = 0;int a;for (; i < ds.Tables[0].Rows.Count; i++)//读取DataSet中的指定数据{x += int.Parse(ds.Tables[0].Rows[i][2].ToString());if (int.Parse(ds.Tables[0].Rows[i][2].ToString()) > 59)h++;}if (i == 0) a = 0;else a = x / i;lbPassnum.Text = h.ToString();lbAvgSco.Text = a.ToString();}private void StuMain_FormClosing_1(object sender, FormClosingEventArgs e){FormLogin m2 = new FormLogin();m2.Show();}private void StuMain_FormClosed(object sender, FormClosedEventArgs e){}}}

（4）注册页面：若学生用户没有登陆账号，则需在学生登录界面选择注册按钮，进入注册界面输入相应信息进行注册。成功注册的前提是你为该校的学生且各信息已填写完整。

图10：注册页面

图11：注册成功

图12：注册失败

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.IO;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Text.RegularExpressions;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class RegisterForm : Form{public RegisterForm(){InitializeComponent();}private void buttonRegister_Click(object sender, EventArgs e){if (tBStuId.Text.Trim() != "" && tBPassword.Text.Trim() != "" && cBSex.Text.Trim() != "" && tBPhoneNum.Text.Trim() != ""){//确认一些信息输入非空try{string connString = "Data Source=.;Initial Catalog=MySchool;Persist Security Info=True;User ID=sa;Password=yourpassword";//数据库连接字符串SqlConnection connection = new SqlConnection(connString);//创建connection对象string username = tBStuId.Text.Trim(); //取出账号string sex = cBSex.Text.Trim(); //取出性别connection.Open();string sql1 = "select Sno,Ssex from Student where Sno = '" + username + "' and Ssex = '" + sex + "'"; //编写SQL命令，查找学生信息中是否有该用户SqlCommand sqlCommand1 = new SqlCommand(sql1, connection);//确认是否有该学员SqlDataReader sqlDataReader1 = sqlCommand1.ExecuteReader();bool a = sqlDataReader1.HasRows;sqlDataReader1.Close();if (a){string sql2 = "select ID from StudentUser where ID = '" + username + "'"; //编写SQL命令SqlCommand sqlCommand2 = new SqlCommand(sql2, connection);//确认是否已经注册过SqlDataReader sqlDataReader2 = sqlCommand2.ExecuteReader();if (!sqlDataReader2.HasRows){string sql3 = "insert into StudentUser (ID, PassWord ,Sex, UserMobile, Birthday) " +"values (@userid, @userpassword,@sex,@usermobile,@Birthday)";SqlCommand command = new SqlCommand(sql3, connection);SqlParameter sqlParameter = new SqlParameter("@userid", tBStuId.Text);command.Parameters.Add(sqlParameter);sqlParameter = new SqlParameter("@userpassword", EncryptWithMD5(tBPassword.Text));command.Parameters.Add(sqlParameter);sqlParameter = new SqlParameter("@sex", cBSex.Text);command.Parameters.Add(sqlParameter);sqlParameter = new SqlParameter("@usermobile", tBPhoneNum.Text);command.Parameters.Add(sqlParameter);sqlParameter = new SqlParameter("@Birthday", dateTimePicker1.Value);command.Parameters.Add(sqlParameter);sqlDataReader2.Close();//打开数据库连接command.ExecuteNonQuery();connection.Close();MessageBox.Show("注册成功");}else{MessageBox.Show("该用户已注册。");}}else{MessageBox.Show("我校无该学员");}}catch (Exception ex){MessageBox.Show(ex.Message);}this.Close();}else{MessageBox.Show("请将信息填写完整！");}}public Byte[] mybyte = new byte[0];public static string EncryptWithMD5(string source){byte[] sor = Encoding.UTF8.GetBytes(source);MD5 md5 = MD5.Create();byte[] result = puteHash(sor);StringBuilder strbul = new StringBuilder(40);for (int i = 0; i < result.Length; i++){strbul.Append(result[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位}return strbul.ToString();}private void tBPassword_Leave(object sender, EventArgs e)//校验密码格式{if (tBStuId.Text.Trim() != ""){//使用regex（正则表达式）进行格式设置 至少有数字、大写字母、小写字母各一个。最少3个字符、最长20个字符。Regex regex = new Regex(@"(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{3,20}");if (regex.IsMatch(tBPassword.Text))//判断格式是否符合要求{//MessageBox.Show("输入密码格式正确!");}else{MessageBox.Show("至少有数字、大写字母、小写字母各一个。最少3个字符、最长20个字符！");tBPassword.Focus();}}else{MessageBox.Show("请填写密码！");}}private void RegisterForm_FormClosing(object sender, FormClosingEventArgs e){FormStuLogin m2 = new FormStuLogin();m2.Show();}private void buttonCancel_Click_1(object sender, EventArgs e){this.Close();}}}

（5）管理员登录页面：若您的身份为管理员，则可在主界面选择“管理员登录”选项，进入管理员登录界面。与学生登录相似，管理员登录成功的前提是正确输入各类信息。但管理员登录不提供“注册”选项，因为管理员身份必须由系统授予——即在数据库中填入相应信息才可成为管理员。

图13：管理员登录页面

图14：管理员登录成功

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class FormManagerLogin : Form{public FormManagerLogin(){InitializeComponent();}public string code;private void buttonLogin_Click(object sender, EventArgs e){string username = tBWorknum.Text.Trim(); //取出账号string password = EncryptWithMD5(tBPassword.Text.Trim()); //取出密码并加密string myConnString = "Data Source=.;Initial Catalog=MySchool;Persist Security Info=True;User ID=sa;Password=yourpassword";SqlConnection sqlConnection = new SqlConnection(myConnString); //实例化连接对象sqlConnection.Open();string sql = "select ID,PassWord from Administrator where ID = '" + username + "' and PassWord = '" + password + "'"; //编写SQL命令SqlCommand sqlCommand = new SqlCommand(sql, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();if (sqlDataReader.HasRows && tBVerifyCode.Text == code){MessageBox.Show("欢迎使用！"); //登录成功ManagerMain managerMain = new ManagerMain();managerMain.Show();this.Hide();}else if (sqlDataReader.HasRows && tBVerifyCode.Text != code){MessageBox.Show("验证码错误，登录失败！");return;}else{MessageBox.Show("账号密码有误，登录失败！");return;}sqlDataReader.Close();sql = "insert into SysLog1 values ( '" + username + "' , 'Administrator','" + DateTime.Now + "' , '" + "Login" + "')"; //编写SQL命令SqlCommand sqlCommand1 = new SqlCommand(sql, sqlConnection);sqlCommand1.ExecuteNonQuery();sqlConnection.Close();}private string EncryptWithMD5(string source){byte[] sor = Encoding.UTF8.GetBytes(source);MD5 md5 = MD5.Create();byte[] result = puteHash(sor);StringBuilder strbul = new StringBuilder(40);for (int i = 0; i < result.Length; i++){strbul.Append(result[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位}return strbul.ToString();}private void FormManagerLogin_Load_1(object sender, EventArgs e){//随机实例化 Random ran = new Random();int number;char code1;//取五个数 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)); //转化为字符 this.code += code1.ToString();}lbVerifyCode.Text = code;}private void FormManagerLogin_FormClosing_1(object sender, FormClosingEventArgs e){FormLogin m2 = new FormLogin();m2.Show();}private void buttonCancel_Click_1(object sender, EventArgs e){this.Close();}}}

（6）管理员主页：管理员主页一共包含五个可选项，如下图所示。其中，对于“学生信息”，“课程信息”，“学生成绩”，管理员可按需进行增、删、改、查操作。

图15：管理员主页

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class ManagerMain : Form{public ManagerMain(){InitializeComponent();}private void buttonLog_Click(object sender, EventArgs e){this.Hide();LogMain m = new LogMain();m.Show();}private void buttonStu_Click(object sender, EventArgs e){this.Hide();StuMessageMain m = new StuMessageMain();m.Show();}private void buttonCourse_Click(object sender, EventArgs e){this.Hide();CourseMessageMain m = new CourseMessageMain();m.Show();}private void buttonGrade_Click(object sender, EventArgs e){this.Hide();StuGradeMain m = new StuGradeMain();m.Show();}private void buttonExit_Click(object sender, EventArgs e){this.Close();}private void ManagerMain_FormClosed(object sender, FormClosedEventArgs e){//Application.Exit();}private void ManagerMain_FormClosing(object sender, FormClosingEventArgs e){FormLogin m2 = new FormLogin();m2.Show();}private void ManagerMain_Load(object sender, EventArgs e){}}}

（7）登录日志页面：登录日志为管理员提供该系统所有用户的登录记录

图16：登录日志页面

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class LogMain : Form{public LogMain(){InitializeComponent();}private void LogMain_Load(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“mySchoolDataSet1.SysLog1”中。您可以根据需要移动或移除它。this.sysLog1TableAdapter.Fill(this.mySchoolDataSet1.SysLog1);}private void buttonReturn_Click(object sender, EventArgs e){this.Close();}private void LogMain_FormClosing(object sender, FormClosingEventArgs e){ManagerMain m2 = new ManagerMain();m2.Show();}}}

（8）学生信息页面：为管理员提供学生信息，且管理员可按需进行增、删、改、查操作。

图17：学生信息页面

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class StuMessageMain : Form{public StuMessageMain(){InitializeComponent();}private void StuMessageMain_Load(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“mySchoolDataSet2.Student”中。您可以根据需要移动或移除它。this.studentTableAdapter.Fill(this.mySchoolDataSet2.Student);}private void buttonReturn_Click(object sender, EventArgs e){this.Close();}private void buttonAdd_Click(object sender, EventArgs e){String StuID = tBStuId.Text.Trim();//读取文本框的值String StuName = tBStuName.Text.Trim();String StuSex = tBStuSex.Text.Trim();String StuSdept = tBStuDept.Text.Trim();int StuAge = int.Parse(tBStuAge.Text.Trim());SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{con.Open();string insertStr = "INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) " +"VALUES ('" + StuID + "','" + StuName + "','" + StuSex + "','" + StuSdept + "'," + StuAge + ")";SqlCommand cmd = new SqlCommand(insertStr, con);//通过sql语句对表添加数值cmd.ExecuteNonQuery();}catch{MessageBox.Show("输入数据违反要求!");}finally{con.Dispose();tBStuId.Text = "";tBStuName.Text = "";tBStuSex.Text = "";tBStuAge.Text = "";tBStuDept.Text = "";}this.studentTableAdapter.Fill(this.mySchoolDataSet2.Student);//刷新表}private void buttonDelete_Click(object sender, EventArgs e){SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{con.Open();string select_id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();//选择的当前行第一列的值，也就是IDstring delete_by_id = "delete from Student where Sno=" + select_id;//sql删除语句SqlCommand cmd = new SqlCommand(delete_by_id, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("请正确选择行!");}finally{con.Dispose();}this.studentTableAdapter.Fill(this.mySchoolDataSet2.Student);}private void buttonEdit_Click(object sender, EventArgs e){String StuID = tBStuId.Text.Trim();String StuName = tBStuName.Text.Trim();String StuSex = tBStuSex.Text.Trim();String StuSdept = tBStuDept.Text.Trim();int StuAge = 0;if (tBStuAge.Text != "") {StuAge = int.Parse(tBStuAge.Text.Trim());}SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{con.Open();if(StuName != "") {string insertStr = "UPDATE Student SET Sname = '" + StuName + "' WHERE Sno = '" + StuID + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}if (StuSex != ""){string insertStr = "UPDATE Student SET Ssex = '" + StuSex + "' WHERE Sno = '" + StuID + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}if (StuSdept != ""){string insertStr = "UPDATE Student SET Sdept = '" + StuSdept + "' WHERE Sno = '" + StuID + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}if (tBStuAge.Text != ""){string insertStr = "UPDATE Student SET Sage = '" + StuAge + "' WHERE Sno = '" + StuID + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}}catch{MessageBox.Show("输入数据违反要求!");}finally{con.Dispose();tBStuId.Text = "";tBStuName.Text = "";tBStuSex.Text = "";tBStuAge.Text = "";tBStuDept.Text = "";}this.studentTableAdapter.Fill(this.mySchoolDataSet2.Student);}private void buttonSearch_Click(object sender, EventArgs e){String StuID = tBStuId.Text.Trim();String conn = "Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword";SqlConnection sqlConnection = new SqlConnection(conn); //实例化连接对象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("查询语句有误，请认真检查SQL语句!");}finally{sqlConnection.Close();tBStuId.Text = "";}}private void StuMessageMain_FormClosing(object sender, FormClosingEventArgs e){ManagerMain m2 = new ManagerMain();m2.Show();}}}

（9）课程信息页面：为管理员提供课程信息，且管理员可按需进行增、删、改、查操作。

图18：课程信息页面

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class CourseMessageMain : Form{public CourseMessageMain(){InitializeComponent();}private void CourseMessageMain_Load(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“mySchoolDataSet3.Course”中。您可以根据需要移动或移除它。this.courseTableAdapter.Fill(this.mySchoolDataSet3.Course);}private void buttonAdd_Click(object sender, EventArgs e){String cno = tBCno.Text.Trim();String cn = tBCname.Text.Trim();String cpo = tBCpno.Text.Trim();int cd = 0;if(tBCcredit.Text != ""){cd = int.Parse(tBCcredit.Text.Trim());}if (cpo == "") {cpo = "NULL";}SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{if(cno == "" || cn =="" || cd == 0){MessageBox.Show("输入数据违反要求!");}else{con.Open();string insertStr = "INSERT INTO Course (Cno,Cname,Cpno,Ccredit) " +"VALUES ('" + cno + "','" + cn + "','" + cpo + "','" + cd + "')";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}}catch{}finally{con.Dispose();tBCno.Text = "";tBCname.Text = "";tBCpno.Text = "";tBCcredit.Text = "";}this.courseTableAdapter.Fill(this.mySchoolDataSet3.Course);}private void buttonDelete_Click(object sender, EventArgs e){SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{con.Open();string select_id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();//选择的当前行第一列的值，也就是IDstring delete_by_id = "delete from Course where Cno=" + select_id;//sql删除语句SqlCommand cmd = new SqlCommand(delete_by_id, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("请正确选择行!");}finally{con.Dispose();}this.courseTableAdapter.Fill(this.mySchoolDataSet3.Course);}private void buttonEdit_Click(object sender, EventArgs e){String cno = tBCno.Text.Trim();String cn = tBCname.Text.Trim();String cpo = tBCpno.Text.Trim();int cd = 0;if(tBCcredit.Text != ""){cd = int.Parse(tBCcredit.Text.Trim());}if (cpo == ""){cpo = "NULL";}SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");con.Open();if(cn != ""){string insertStr = "UPDATE Course SET Cname = '" + cn + "' WHERE Cno = '" + cno + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}if (cpo != ""){string insertStr = "UPDATE Course SET Cpno = '" + cpo + "' WHERE Cno = '" + cno + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}if (tBCcredit.Text != ""){string insertStr = "UPDATE Course SET Ccredit = '" + cd + "' WHERE Cno = '" + cno + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}if(cno == ""){MessageBox.Show("输入数据违反要求!");}con.Dispose();tBCno.Text = "";tBCname.Text = "";tBCpno.Text = "";tBCcredit.Text = "";this.courseTableAdapter.Fill(this.mySchoolDataSet3.Course);}private void buttonSearch_Click(object sender, EventArgs e){String cno = tBCno.Text.Trim();String conn = "Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword";SqlConnection sqlConnection = new SqlConnection(conn); //实例化连接对象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("查询语句有误，请认真检查SQL语句!");}finally{sqlConnection.Close();tBCno.Text = "";}}private void buttonReturn_Click(object sender, EventArgs e){this.Close();}private void CourseMessageMain_FormClosing(object sender, FormClosingEventArgs e){ManagerMain m2 = new ManagerMain();m2.Show();}}}

（10）学生成绩信息页面：为管理员提供学生成绩信息，且管理员可按需进行增、删、改、查操作。

图19：学生成绩信息页面

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class StuGradeMain : Form{public StuGradeMain(){InitializeComponent();}private void StuGradeMain_Load(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“mySchoolDataSet4.SC”中。您可以根据需要移动或移除它。this.sCTableAdapter.Fill(this.mySchoolDataSet4.SC);}private void buttonAdd_Click(object sender, EventArgs e){String sno = tBSId.Text.Trim();String cno = tBCno.Text.Trim();int gra = int.Parse(tBGrade.Text.Trim());SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{con.Open();string insertStr = "INSERT INTO SC (Sno,Cno,Grade) " +"VALUES ('" + sno + "','" + cno + "','" + gra + "')";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("输入数据违反要求!");}finally{con.Dispose();tBSId.Text = "";tBCno.Text = "";tBGrade.Text = "";}this.sCTableAdapter.Fill(this.mySchoolDataSet4.SC);}private void buttonDelete_Click(object sender, EventArgs e){SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{con.Open();string select_id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();//选择的当前行第一列的值，也就是IDstring select_cid = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();//选择的当前行第二列的值，也就是CIDstring deletesql = "delete from SC where Sno='" + select_id + "' AND Cno='" + select_cid + "'";//sql删除语句SqlCommand cmd = new SqlCommand(deletesql, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("请正确选择行!");}finally{con.Dispose();}this.sCTableAdapter.Fill(this.mySchoolDataSet4.SC);}private void buttonEdit_Click(object sender, EventArgs e){String sno = tBSId.Text.Trim();String cno = tBCno.Text.Trim();int gra = int.Parse(tBGrade.Text.Trim());SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword");try{con.Open();string insertStr = "UPDATE SC SET Grade='" + gra + "' WHERE Sno = '" + sno + "' AND Cno = '" + cno + "'";SqlCommand cmd = new SqlCommand(insertStr, con);cmd.ExecuteNonQuery();}catch{MessageBox.Show("输入数据违反要求!");}finally{con.Dispose();tBSId.Text = "";tBCno.Text = "";tBGrade.Text = "";}this.sCTableAdapter.Fill(this.mySchoolDataSet4.SC);}private void buttonSearch_Click(object sender, EventArgs e){String sno = tBSId.Text.Trim();String cno = tBCno.Text.Trim();String conn = "Data Source=.;Initial Catalog=MySchool;User ID=sa;Password=yourpassword";SqlConnection sqlConnection = new SqlConnection(conn); //实例化连接对象try{String selectsql = "select * from SC where Sno='" + sno + "'";sqlConnection.Open();if(sno != "" && cno == ""){selectsql = "select * from SC where Sno='" + sno + "'";}if (sno != "" && cno != ""){selectsql = "select * from SC where Sno='" + sno + "' AND Cno='" + cno + "'";}SqlCommand sqlCommand = new SqlCommand(selectsql, sqlConnection);SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();BindingSource bindingSource = new BindingSource();bindingSource.DataSource = sqlDataReader;dataGridView1.DataSource = bindingSource;}catch{MessageBox.Show("查询语句有误，请认真检查SQL语句!");}finally{sqlConnection.Close();tBSId.Text = "";tBCno.Text = "";}}private void buttonMes_Click(object sender, EventArgs e){string connString = "Data Source=.;Initial Catalog=MySchool;Persist Security Info=True;User ID=sa;Password=yourpassword";//数据库连接字符串SqlConnection connection = new SqlConnection(connString);//创建connection对象string sql1 = "EXEC COURSE_AVG1";//编写SQL命令SqlCommand sqlCommand1 = new SqlCommand(sql1, connection);connection.Open();sqlCommand1.ExecuteNonQuery();connection.Close();this.Hide();StatisiticMain m2 = new StatisiticMain();m2.Show();}private void buttonReturn_Click(object sender, EventArgs e){this.Close();}private void StuGradeMain_FormClosing(object sender, FormClosingEventArgs e){ManagerMain m2 = new ManagerMain();m2.Show();}}}

（11）成绩统计页面：为管理员提供统计信息。

图20：成绩统计页面

对应C#实现如下：

using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Data.SqlClient;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace SchoolManage{public partial class StatisiticMain : Form{public StatisiticMain(){InitializeComponent();}private void StatisiticMain_Load(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“mySchoolDataSet6.AVG1”中。您可以根据需要移动或移除它。this.aVG1TableAdapter.Fill(this.mySchoolDataSet6.AVG1);}private void buttonReturn_Click(object sender, EventArgs e){this.Close();}private void StatisiticMain_FormClosing(object sender, FormClosingEventArgs e){StuGradeMain m2 = new StuGradeMain();m2.Show();}}}

（12）在主界面点击右上角的“×”即退出系统。

（注：以上页面中的“返回”、“退出”、“取消”、“×”选项均使得页面从当前界面返回到上一界面或上一级界面，并不使程序退出，仅主界面的“×”号可退出系统。）

图21：退出系统

以上就是本次数据库课程设计的全部内容啦，欢迎小伙伴们交流心得，批评指正。

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