用C#与数据库实现MySchoolBase系统
下面是自己用C#写的一个使用数据库实现MySchoolBase系统管理
（大神勿喷，初学者以借鉴为主）
一共分为三个类分别是：Program（启动类），DBOperation（操作语句类），SchoolManager（显示语句类）
代码部分（如下）：
既然使用了数据库那么using还是要记得导入的呦：
using System.Data.SqlClient;
using System.Data;
Program（启动类）：
class Program
{
static void Main(string[] args)
{
SchoolManager SchoolManager = new SchoolManager();
SchoolManager.Login();
}
}DBOperation（操作语句类）：
class DBOperation
{
string connString = "Data Source=.;Initial Catalog=Demo;User ID=sa;Pwd=sa";//连接数据库
//判断输入用户账号密码是否正确
#region 判断输入用户账号密码是否正确
public bool CheckUserInfo(string username,string password) {
bool flag = true;
string connString = "Data Source=.;Initial Catalog=Demo;User ID="+ username + ";Pwd="+ password;//连接数据库
SqlConnection connection = new SqlConnection(connString);
try {
connection.Open();//打开数据库
flag = true;
}
catch (Exception) {
Console.WriteLine("发生异常！");
flag = false;
}
finally {
connection.Close();//关闭数据库
}
return flag;
}
#endregion
//统计人数操作方法
#region 统计人数操作方法
public int GetStudentAmount() {
SqlConnection connection = new SqlConnection(connString);
try {
string str = "SELECT COUNT(*) FROM Student";
connection.Open();
SqlCommand command = new SqlCommand(str, connection);
int iRet = (int)command.ExecuteScalar();
return iRet;//正确人数
}
catch (Exception) {
return -1;//不正确
}
finally {
connection.Close();
}
}
#endregion
//查看学生名单操作
#region 查看学生名单操作
public SqlDataReader GetStudentList() {
SqlConnection conncetion = new SqlConnection(connString);
try {
conncetion.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine("SELECT");
sb.AppendLine(" [StudentNo]");
sb.AppendLine(",[StudentName]");
sb.AppendLine(" FROM");
sb.AppendLine(" [Student]");
SqlCommand command = new SqlCommand(sb.ToString(), conncetion);
return command.ExecuteReader(CommandBehavior.CloseConnection);//在执行命令时，如果关闭关联的DataReader对象，则关联的Connection对象也将关闭
}
catch (Exception) {
return null;
}
}
#endregion
//新增年纪记录操作
#region 新增年纪记录操作
public int InsertGrade(string Name) {
SqlConnection connection = new SqlConnection(connString);
try {
connection.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine("INSERT INTO");
sb.AppendLine(" [Grade]");
sb.AppendLine(" VALUES ");
sb.AppendLine(" ('"+ Name + "')");
SqlCommand command = new SqlCommand(sb.ToString(), connection);
return command.ExecuteNonQuery();
}
catch (Exception) {
return -1;
}
finally {
connection.Close();
}
}
#endregion
//按学号查询学生姓名操作
#region 按学号查询学生姓名操作
public string GetStudentNameByNo(string stuNo) {
SqlConnection connection = new SqlConnection(connString);
try {
connection.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine("SELECT");
sb.AppendLine(" [StudentNo]");
sb.AppendLine(" ,[StudentName]");
sb.AppendLine(" FROM");
sb.AppendLine(" [Student]");
sb.AppendLine(" WHERE");
sb.AppendLine(" [StudentNo] = '"+ stuNo + "'");
SqlCommand command = new SqlCommand(sb.ToString(), connection);
SqlDataReader reader = command.ExecuteReader();
string stuName = string.Empty;
if (reader.Read()) {
stuName = Convert.ToString(reader["StudentName"]);
}
reader.Close();
return stuName;
}
catch (Exception e) {
Console.WriteLine(e.Message);
return string.Empty;
}
finally {
connection.Close();
}
}
#endregion
//按姓名查询学生信息操作
#region 按姓名查询学生信息操作
public SqlDataReader GetStudentInfoByName(string stuName) {
SqlConnection connection = new SqlConnection(connString);
try {
connection.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine("SELECT");
sb.AppendLine(" A.[StudentNo],A.[StudentName],A.[Sex],B.[GradeName],A.[Phone],A.[Address],A.[BornDate],A.[Email]");
sb.AppendLine(" FROM");
sb.AppendLine(" [Student] AS A,[Grade] AS B");
sb.AppendLine(" WHERE");
sb.AppendLine(" A.[GradeId] = B.[GradeId]");
sb.AppendLine(" AND");
sb.AppendLine("A.[StudentName] LIKE '%"+ stuName+ "%'");
SqlCommand command = new SqlCommand(sb.ToString(), connection);
return command.ExecuteReader(CommandBehavior.CloseConnection);
}
catch (Exception e) {
Console.WriteLine("出现异常！",e.Message);
return null;
}
}
#endregion
//修改学生出生日期操作
#region 修改学生出生日期操作
public int UpdateStuBornDate(string stuNo,DateTime bornDate) {
SqlConnection connection = new SqlConnection(connString);
try {
connection.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine("UPDATE");
sb.AppendLine(" [Student]");
sb.AppendLine(" SET");
sb.AppendLine(" [BornDate]='"+ bornDate+ "'");
sb.AppendLine(" WHERE");
sb.AppendLine(" [StudentNo]='"+ stuNo + "'");
SqlCommand command = new SqlCommand(sb.ToString(), connection);
return command.ExecuteNonQuery();
}
catch (Exception e) {
Console.WriteLine(e.Message);
return -1;
}
finally {
connection.Close();
}
}
#endregion
//删除学生记录操作
#region 删除学生记录操作
public int DeleteStudent(string stuNo) {
SqlConnection connection = new SqlConnection(connString);
try
{
connection.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine("DELETE");
sb.AppendLine(" FROM");
sb.AppendLine(" Student");
sb.AppendLine(" WHERE");
sb.AppendLine(" [StudentNo] = '"+ stuNo + "'");
SqlCommand command = new SqlCommand(sb.ToString(), connection);
return command.ExecuteNonQuery();
}
catch (Exception e) {
Console.WriteLine(e.Message);
return -1;
}
finally {
connection.Close();
}
}
#endregion
}SchoolManager（显示语句类）：
//业务处理
class SchoolManager
{
//输入用户账户密码
#region 输入用户账户密码
public void Login() {
Console.Write("请输入您的管理员用户名：");
string username = Console.ReadLine();
Console.Write("请输入您的密码：");
string password = Console.ReadLine();
DBOperation dboperation = new DBOperation();
bool flag = dboperation.CheckUserInfo(username, password);
if (flag)
{
Console.WriteLine("登录成功！");
CaiDan();//菜单
}
else {
Console.WriteLine("对不起，登录失败！");
}
}
#endregion
//菜单
#region 菜单
public void CaiDan() {
do {
Console.WriteLine("==========请选择操作键==========");
Console.WriteLine("1.统计学生人数\n2.查看学生名单\n3.按学号查询学生姓名\n4.按姓名查询学生信息\n5.修改学生出生日期\n6.删除学生记录\n7.新增年纪记录\n0.退出");
Console.WriteLine("================================");
Console.Write("请输入您的选择：");
int xuanZe = int.Parse(Console.ReadLine());
switch (xuanZe) {
case 1:
//统计学生人数
TongJi();
continue;
case 2:
//查看学生名单
ShowStudentList();
continue;
case 3:
//按学号查询学生姓名
ShowStudentName();
continue;
case 4:
//按姓名查询学生信息
ShowStudentInfoByName();
continue;
case 5:
//修改学生出生日期
ShowStuBornDate();
continue;
case 6:
//删除学生记录
ShowDeleteStudent();
break;
case 7:
//新增年纪记录
InsertGrade();
continue;
case 0:
//退出
Console.WriteLine("欢迎下次光临明宇学校管理系统！");
break;
default:
Console.WriteLine("对不起，没有该选项！");
continue;
}
} while (true);
}
#endregion
//统计学生人数
#region 统计学生人数
public void TongJi() {
DBOperation dboperation = new DBOperation();
int shu = dboperation.GetStudentAmount();
if (shu == -1)
{
Console.WriteLine("人数获取不正确！");
return;
}
else {
Console.WriteLine("在校学生人数：{0}\n",shu);
}
}
#endregion
//查看学生名单
#region 查看学生名单
public void ShowStudentList() {
DBOperation dboperation = new DBOperation();
SqlDataReader reader = dboperation.GetStudentList();
if (reader == null) {
Console.WriteLine("对不起，出现异常！");
return;
}
Console.WriteLine("----------------------");
Console.WriteLine("学号\t\t姓名");
Console.WriteLine("----------------------");
StringBuilder sb = new StringBuilder();
//循环读取数据
while (reader.Read()) {
sb.AppendFormat("{0}\t{1}", reader["StudentNo"],reader["StudentName"]);
Console.WriteLine(sb);
sb.Length = 0;
}
Console.WriteLine("----------------------");
//关闭 DataReader
reader.Close();
}
#endregion
//新增年纪记录
#region 新增年纪记录
public void InsertGrade() {
DBOperation dboperation = new DBOperation();
Console.Write("请输入待插入的年纪名称：");
string name = Console.ReadLine();
int iRet = dboperation.InsertGrade(name);
if (iRet == -1)
{
Console.WriteLine("对不起，出现异常！");
}
else {
Console.WriteLine("插入成功！");
}
}
#endregion
//按学号查询学生姓名
#region 按学号查询学生姓名
public void ShowStudentName() {
DBOperation dboperation = new DBOperation();
Console.Write("请输入学生学号：");
string stuNo = Console.ReadLine();
string stuName = dboperation.GetStudentNameByNo(stuNo);
if (stuName.Equals(string.Empty))
{
Console.WriteLine("对不起，出现异常！");
}
else {
StringBuilder sb = new StringBuilder();
sb.AppendFormat("学号是{0}的学生为：{1}\n",stuNo,stuName);
Console.WriteLine(sb);
}
}
#endregion
//按姓名查询学生信息
#region 按姓名查询学生信息
public void ShowStudentInfoByName() {
DBOperation dboperation = new DBOperation();
Console.Write("请输入学生姓名：");
string stuName = Console.ReadLine();
SqlDataReader reader = dboperation.GetStudentInfoByName(stuName);
if (reader == null)
{
Console.WriteLine("对不起，运行出现异常！");
return;
}
Console.WriteLine("*************************************************************************");
Console.WriteLine("学号\t\t姓名\t性别\t年纪\t\t联系电话\t地址\t\t出生日期\t邮箱");
Console.WriteLine("*************************************************************************");
while (reader.Read()) {
StringBuilder sb = new StringBuilder();
sb.AppendFormat("{0}\t{1}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}", reader["StudentNo"], reader["StudentName"], reader["Sex"], reader["GradeName"], reader["Phone"], reader["Address"], reader["BornDate"],reader["Email"]);
Console.WriteLine(sb.ToString()+"\n");
sb.Length = 0;
}
reader.Close();
}
#endregion
//修改学生出生日期
#region 修改学生出生日期
public void ShowStuBornDate() {
DBOperation dboperation = new DBOperation();
Console.Write("请输入学号：");
string stuNo = Console.ReadLine();
Console.Write("请输入修改后的生日：");
string stuBornDate = Console.ReadLine();
DateTime bornDate = Convert.ToDateTime(stuBornDate);
int shu = dboperation.UpdateStuBornDate(stuNo, bornDate);
if (shu == -1)
{
Console.WriteLine("对不起，发生异常！");
}
else {
Console.WriteLine("修改成功！");
}
}
#endregion
//删除学生记录
#region 删除学生记录
public void ShowDeleteStudent() {
DBOperation dboperation = new DBOperation();
Console.Write("请输入学号：");
string stuNo = Console.ReadLine();
int shu = dboperation.DeleteStudent(stuNo);
if (shu == -1)
{
Console.WriteLine("对不起，删除失败！");
}
else {
Console.WriteLine("删除成功！");
}
}
#endregion
}