C# ,十七章 项目案例: QQ用户信息管理系统
测试:namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
UserManager manger = new UserManager();
manger.Login();
}
}
} DB类 :DB类 :DB类 : using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
namespace ConsoleApplication1
{
class DBHandle
{
string strConn = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True";
public bool CheckAdminInfo(string userName, string pwd, ref string strMsg)
{
SqlConnection conn = new SqlConnection(strConn);
try
{
string strSql = "select count(*) from Admin where LoginId='" + userName + "' and LoginPwd='" + pwd + "'";
conn.Open();
SqlCommand comm = new SqlCommand(strSql, conn);
int iRet = (int)comm.ExecuteScalar();
if (iRet != 1)
{
strMsg = "输入无效！";
return false;
}
else
{
return true;
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
strMsg = "发生异常！";
return false;
}
finally
{
conn.Close();
}
}
public SqlDataReader GetUserList()
{
try
{
SqlConnection conn = new SqlConnection(strConn);
conn.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine(" SELECT");
sb.AppendLine(" a.[UserId]");
sb.AppendLine(" ,a.[UserName]");
sb.AppendLine(" ,b.[LevelName]");
sb.AppendLine(" ,a.[Email]");
sb.AppendLine(" ,a.[OnLineDay]");
sb.AppendLine(" FROM");
sb.AppendLine(" [UserInfo] a, [Level] b ");
sb.AppendLine(" WHERE");
sb.AppendLine(" a.[LevelId] = b.[LevelId]");
SqlCommand comm = new SqlCommand(sb.ToString(), conn);
return comm.ExecuteReader();
}
catch (Exception)
{
return null;
}
}
public SqlDataReader GetUserIdAndOnlineDay()
{
try
{
SqlConnection conn = new SqlConnection(strConn);
conn.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine(" SELECT");
sb.AppendLine(" [UserId]");
sb.AppendLine(" ,[OnLineDay]");
sb.AppendLine(" FROM");
sb.AppendLine(" [UserInfo] ");
SqlCommand comm = new SqlCommand(sb.ToString(), conn);
return comm.ExecuteReader();
}
catch (Exception)
{
return null;
}
}
public int UpdateOnlineDay(int userId, double newOnlineDay)
{
try
{
SqlConnection conn = new SqlConnection(strConn);
conn.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine("UPDATE");
sb.AppendLine(" [UserInfo]");
sb.AppendLine("SET");
sb.AppendLine(" [OnLineDay]=" + newOnlineDay);
sb.AppendLine("WHERE");
sb.AppendLine(" [UserId]=" + userId);
SqlCommand comm = new SqlCommand(sb.ToString(), conn);
return comm.ExecuteNonQuery();
}
catch (Exception)
{
return -1;
}
}
public int UpdateUserLevel(int userId, int iLevel)
{
try
{
SqlConnection conn = new SqlConnection(strConn);
conn.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine(" UPDATE");
sb.AppendLine(" [UserInfo]");
sb.AppendLine(" SET");
sb.AppendLine(" [LevelId]=" + iLevel);
sb.AppendLine(" WHERE");
sb.AppendLine(" [UserId]=" + userId);
SqlCommand comm = new SqlCommand(sb.ToString(), conn);
return comm.ExecuteNonQuery();
}
catch (Exception)
{
return -1;
}
}
public object InsertUserInfo(string userName, string userPwd, string email)
{
SqlConnection conn = new SqlConnection(strConn);
try
{
conn.Open();
StringBuilder sb = new StringBuilder();
sb.AppendLine(" INSERT INTO");
sb.AppendLine(" [UserInfo]");
sb.AppendLine(" VALUES");
sb.AppendLine(" ('" + userName + "','" + userPwd + "',1,'" + email + "',0);");
sb.AppendLine(" SELECT @@Identity;");
SqlCommand comm = new SqlCommand(sb.ToString(), conn);
return comm.ExecuteScalar();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return -1;
}
}
}
}
User类:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
namespace ConsoleApplication1
{
class UserManager
{
private DBHandle _dbHandle = new DBHandle();
private string EXCEPT;
private string ERRMSG;
public void Login() //登录
{
int count = 0;
do
{
string sUserName = string.Empty;
string sPwd = string.Empty;
count++;
Console.WriteLine("请输入用户名：");
sUserName = Console.ReadLine();
Console.WriteLine("请输入密码：");
sPwd = Console.ReadLine();
if (sUserName.Equals(string.Empty)|| sPwd.Equals(string.Empty))
{
Console.WriteLine("输入错误!重新输入!!");
continue;
}
else
{
string strMsg = string.Empty;
bool bR = _dbHandle.CheckAdminInfo(sUserName, sPwd, ref strMsg);
if (bR)
{ Console.WriteLine("登录成功！");
ShowMenu();
break;
}
else
{
Console.WriteLine("登录失败：" + strMsg + "\n");
continue;
}
}
} while (count < 3);
if (count == 3)
Console.WriteLine("\n连续三次登录失败，退出本系统！\n");
}
private void ShowMenu()
{
string option = "";
do
{
Console.WriteLine("");
Console.WriteLine("=======欢迎登录QQ用户信息管理系统======");
Console.WriteLine("------------请选择菜单项----------");
Console.WriteLine("1、显示用户清单");
Console.WriteLine("2、更新在线天数");
Console.WriteLine("3、添加用户新记录");
Console.WriteLine("4、更新用户等级");
Console.WriteLine("5、删除用户记录");
Console.WriteLine("0、退出");
Console.WriteLine("=========================================");
option = Console.ReadLine();
switch (option)
{ case "1":
ShowUserInfo();
continue;
case "2":
UpdateOnLineDay();
continue;
case "3":
InsertUserInfo();
continue;
case "4":
UpdateUserLevel();
continue;
case "5":
// DeleteUserInfo();
continue;
case "0":
if (IsExit())
{
break;
}
else
{
continue;
}
default:
continue;
}
break;
} while (true);
}
private void ShowUserInfo()
{
SqlDataReader reader = _dbHandle.GetUserList();
if (reader == null)
{
Console.WriteLine(EXCEPT);
return;
}
DisplayUserInfo(reader);
}
private void DisplayUserInfo(SqlDataReader reader)
{
Console.WriteLine("--------------------------------------------------------------------------------");
Console.WriteLine("编号\t昵称\t\t等级\t\t邮箱\t\t在线天数");
Console.WriteLine("--------------------------------------------------------------------------------");
while (reader.Read())
{
Console.Write(reader["UserId"] + "\t");
Console.Write(reader["UserName"] + "\t");
Console.Write(ShowDesign((String)reader["LevelName"])+ "\t\t");
Console.Write(reader["Email"] + "\t");
Console.WriteLine(reader["OnLineDay"]);
}
Console.WriteLine("--------------------------------------------------------------------------------");
}
private string ShowDesign(string strLevel)
{
string strDesign = string.Empty;
switch (strLevel)
{
case "无等级":
strDesign = "―";
break;
case "星星":
strDesign = "☆";
break;
case "月亮":
strDesign = "€";
break;
case "太阳":
strDesign = "◎";
break;
default:
break;
}
return strDesign;
}
private void UpdateOnLineDay()
{
try
{
Console.WriteLine("请输入用户编号：");
string strUserId = Console.ReadLine();
int iUserId = Convert.ToInt32(strUserId);
Console.WriteLine("请输入新的在线天数");
string strNewOnlineDay = Console.ReadLine();
double iNewOnlineDay = Convert.ToDouble(strNewOnlineDay);
int iRet = _dbHandle.UpdateOnlineDay(iUserId, iNewOnlineDay);
if (iRet == -1)
Console.WriteLine(ERRMSG);
else if (iRet == 0)
{
Console.WriteLine("用户记录不存在");
}
else
{
Console.WriteLine("修改成功！");
}
}
catch (Exception)
{
Console.WriteLine(EXCEPT);
}
} private void InsertUserInfo()
{
Console.WriteLine("请输入用户昵称：");
string strUserName = Console.ReadLine();
Console.WriteLine("请输入用户密码：");
string strUserPwd = Console.ReadLine();
Console.WriteLine("请输入用户邮箱地址：");
string strUserEmail = Console.ReadLine();
int iRet = Convert.ToInt32(_dbHandle.InsertUserInfo(strUserName, strUserPwd, strUserEmail));
if (iRet == -1)
{
Console.WriteLine(EXCEPT);
}
else if (iRet == 0)
{
Console.WriteLine("用户记录不存在");
}
else
{
Console.WriteLine("插入成功！用户编号是：" + iRet);
}
}
private int JudgeLevelByOnLineDay(double iOnlineDay)
{
const int LEVEL1 = 5;
const int LEVEL2 = 32;
const int LEVEL3 = 320;
int iNewLevel = 0;//等级
if (iOnlineDay >= LEVEL1 && iOnlineDay < LEVEL2)
{
iNewLevel = 2;
}
else if (iOnlineDay >= LEVEL2 && iOnlineDay < LEVEL3)
{
iNewLevel = 3;
}
else if (iOnlineDay >= LEVEL3)
{
iNewLevel = 4;
}
else
{
iNewLevel = 1;
}
return iNewLevel;
}
private void UpdateUserLevel()
{
SqlDataReader reader = _dbHandle.GetUserIdAndOnlineDay();
if (reader == null)
{
Console.WriteLine(EXCEPT);
return;
}
int iUserId = 0; //用户编号
double iLineDay = 0;
int iLevelId = 0; //用户等级
int count = 0;
while (reader.Read())
{
iUserId = Convert.ToInt32(reader["UserId"]);//用户编号的类型转换
iLineDay = Convert.ToDouble(reader["OnLineDay"]);
iLevelId = JudgeLevelByOnLineDay(iLineDay);
_dbHandle.UpdateUserLevel(iUserId, iLevelId);
count++;
}
Console.WriteLine("本次共更新用户记录数：{0}", count);
Console.WriteLine("更新成功！");
}
private bool IsExit()
{
Console.WriteLine("是否退出？（Y/N）");
string strRet = Console.ReadLine();
strRet = strRet.Trim().ToUpper();
if (strRet.Equals("Y"))
{
return true;
}
else
{
return false;
}
}
}
}