QQ用户信息管理系统
项目要求
注意事项:
请简述“QQ用户信息管理系统”项目需求 上网查询有关“用例图”的概念和使用方法 QQ用户信息管理系统的使用对象是谁?
系统中,包括哪些QQ用户信息?
QQ用户信息表与QQ等级表之间是什么关系?
用户信息关系
选择结构关键代码
用户登录之后
1.操作数据库类
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.Data.SqlClient; namespace QQUserManageSystem { /// <summary> /// 操作数据库类 /// </summary> class DBHandle { //连接字符串 private const string strConn = @"Data Source=.;Initial Catalog=QQDB;User ID=sa;Password=bdqn"; #region 检查管理员信息 /// <summary> /// 检查管理员信息 /// </summary> /// <param name="userName">管理员用户名</param> /// <param name="pwd">密码</param> /// <param name="strMsg">需返回的处理信息</param> /// <returns>成功&失败</returns> public bool CheckAdminInfo(string userName, string pwd, ref string strMsg) { //创建数据库连接 SqlConnection conn = new SqlConnection(strConn); try { //创建Sql语句 string strSql = "select count(*) from Admin where LoginId='" + userName + "' and LoginPwd='" + pwd + "'"; conn.Open(); //创建Command命令 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) { strMsg = "发生异常!"; return false; } finally { //关闭数据库连接 conn.Close(); } } #endregion #region 取得用户信息列表 /// <summary> /// 取得学生用户列表 /// </summary> /// <returns>DataReader</returns> 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; } } #endregion #region 取得所有用户的用户编号和用户等级 /// <summary> /// 取得所有用户的用户编号和用户等级 /// </summary> /// <returns>DataReader</returns> 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; } } #endregion #region 更新在线天数 /// <summary> /// 更新在线天数 /// </summary> /// <param name="userId">用户编号</param> /// <param name="onlineDay">在线天数</param> /// <returns>受影响的行数&-1:异常</returns> 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; } } #endregion #region 更新用户等级 /// <summary> /// 更新用户等级 /// </summary> /// <param name="userId">用户编号</param> /// <param name="iLevel">用户等级</param> /// <returns>受影响的行数&-1:异常</returns> 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; } } #endregion #region 添加用户 /// <summary> /// 添加用户 /// </summary> /// <param name="userName">昵称</param> /// <param name="userPwd">密码</param> /// <param name="email">邮箱</param> /// <returns>受影响行数&-1:异常</returns> public object InsertUserInfo(string userName, string userPwd, string email) { SqlConnection conn = new SqlConnection(strConn); try { conn.Open(); StringBuilder sb = new StringBuilder(); //插入用户记录 sb.AppendLine(" INSERT INTO"); sb.AppendLine(" [UserInfo]"); sb.AppendLine(" VALUES"); sb.AppendLine(" ('" + userName + "','" + userPwd + "',1,'" + email + "',0);"); //获得插入记录的用户编号 sb.AppendLine(" SELECT @@Identity;"); SqlCommand comm = new SqlCommand(sb.ToString(), conn); // return comm.ExecuteNonQuery(); return comm.ExecuteScalar(); } catch (Exception) { return -1; } } #endregion #region 按用户编号查询用户信息 public SqlDataReader GetUserByID(int UserID) { 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.[UserId] = " + UserID); sb.AppendLine(" AND"); sb.AppendLine(" a.[LevelId] = b.[LevelId]"); SqlCommand comm = new SqlCommand(sb.ToString(), conn); return comm.ExecuteReader(); } catch(Exception) { return null; } } #endregion #region 删除用户 /// <summary> /// 删除用户 /// </summary> /// <param name="strUserId">用户编号</param> /// <returns>受影响的行数&-1:失败</returns> public int DeleteUserInfo(int strUserId) { try { SqlConnection conn = new SqlConnection(strConn); conn.Open(); StringBuilder sb = new StringBuilder(); sb.AppendLine(" DELETE FROM"); sb.AppendLine(" [UserInfo]"); sb.AppendLine( "WHERE"); sb.AppendLine(" [UserId]=" + strUserId); SqlCommand comm = new SqlCommand(sb.ToString(), conn); return comm.ExecuteNonQuery(); } catch (Exception) { return -1; } } #endregion } }
2.处理QQ用户管理业务信息类
显示(查询)
修改更新信息
将输入信息更新到数据库 当输入的在线天数非整型时给出“输入错误”提示 异常发生给出相应提示 更新成功给出“修改成功”的提示
插入用户信息
将输入的信息增加到UserInfo表中 用户等级默认为1,在线天数默认为1 操作成功给出“插入成功”提示 异常发生给出相应提示
删除
根据用户编号删除对应的用户的全部信息 删除成功给出“删除成功”提示 删除失败给出“删除失败”提示
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.Data.SqlClient; namespace QQUserManageSystem { /// <summary> /// 处理QQ用户管理业务信息类 /// </summary> class UserManager { private DBHandle _dbHandle = new DBHandle();//创建DBHandle的实例 const String ERRMSG = "数据操作失败!"; const String EXCEPT = "出现异常。请与系统管理员联系!"; #region 执行验证管理员登录并处理结果信息 /// <summary> /// 执行验证管理员登录并处理结果信息 /// </summary> public void Login() { int count = 0; do { string strUserName = string.Empty;//初始化管理员登录名 string strPwd = string.Empty;//初始化管理员密码 count++; Console.WriteLine("请输入用户名:"); strUserName = Console.ReadLine(); Console.WriteLine("请输入密码:"); strPwd = Console.ReadLine(); //非空验证 if (strUserName.Equals(string.Empty) || strPwd.Equals(string.Empty)) { Console.WriteLine("输入错误,请重新输入!\n"); continue;//重新输入用户名和密码 } else { // 需返回的结果信息 string strMsg = string.Empty; //数据库验证 bool bRet = _dbHandle.CheckAdminInfo(strUserName, strPwd, ref strMsg); if (bRet) { Console.WriteLine("登录成功!"); // 显示菜单 ShowMenu(); break;//退出程序 } else { Console.WriteLine("登录失败:" + strMsg + "\n"); continue;//重新输入用户名和密码 } } } while (count < 3); if (count == 3) Console.WriteLine("\n连续三次登录失败,退出本系统!\n"); } #endregion #region 显示菜单 /// <summary> /// 显示菜单 /// </summary> 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"://显示用户信息 ShowUserInfo(); continue; case "2"://更新在线天数 UpdateOnLineDay(); continue; case "3"://添加用户 InsertUserInfo(); continue; case "4"://更新用户等级 UpdateUserLevel(); continue; case "5"://删除用户 DeleteUserInfo(); continue; case "0": if (IsExit()) { break;//退出 } else { continue; } default: continue; } break; } while (true); } #endregion #region 显示用户列表 /// <summary> /// 输出用户列表 /// </summary> private void ShowUserInfo() { SqlDataReader reader = _dbHandle.GetUserList(); if (reader == null) { Console.WriteLine(EXCEPT); return; } DisplayUserInfo(reader); } /// <summary> /// 输出用户信息 /// </summary> /// <param name="reader">查询获得的用户记录</param> 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("--------------------------------------------------------------------------------"); } #endregion #region 根据等级名称输出相应符号 /// <summary> /// 根据等级名称输出相应符号 /// </summary> /// <param name="strLevel">等级名称</param> /// <returns></returns> 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; } #endregion #region 更新用户在线天数 /// <summary> /// 更新用户在线天数 /// </summary> 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); } } #endregion #region 添加一条用户记录 /// <summary> /// 输出添加用户的结果 /// </summary> 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); } } #endregion #region 根据在线天数判定用户等级 /// <summary> /// 根据在线天数判定用户等级 /// </summary> /// <param name="iOnlineDay">在线天数</param> /// <returns>/计算后的用户等级</returns> private int JudgeLevelByOnLineDay(double iOnlineDay) { const int LEVEL1 = 5; const int LEVEL2 = 32; const int LEVEL3 = 320; int iNewLevel = 0;//计算后的等级 if (iOnlineDay >= LEVEL1 && iOnlineDay < LEVEL2)//5<=在线天数<32更新为星星 { iNewLevel = 2; } else if (iOnlineDay >= LEVEL2 && iOnlineDay < LEVEL3)//32<=在线天数<320更新为月亮 { iNewLevel = 3; } else if (iOnlineDay >= LEVEL3)//在线天数>=320更新为太阳 { iNewLevel = 4; } else { iNewLevel = 1; } return iNewLevel; } #endregion #region 更新用户等级 /// <summary> /// 更新用户等级 /// </summary> private void UpdateUserLevel() { //取得所有用户的用户编号和在线天数 SqlDataReader reader = _dbHandle.GetUserIdAndOnlineDay(); if (reader == null) { Console.WriteLine(EXCEPT); return; } // Console.WriteLine("----------------------开始更新--------------------------------"); int iUserId = 0; //用户编号 double iLineDay = 0; //用户在线天数 int iLevelId = 0; //用户等级 int count = 0; //更新记录数 //循环取得每行的用户编号和用户等级 while (reader.Read()) { iUserId = Convert.ToInt32(reader["UserId"]);//用户编号的类型转换 iLineDay = Convert.ToDouble(reader["OnLineDay"]);//用户在线天数的类型转换 iLevelId = JudgeLevelByOnLineDay(iLineDay);//根据在线天数判定用户等级 _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!"); // Console.WriteLine("----------------------更新结束---------------------------------"); } #endregion #region 删除指定的用户记录 /// <summary> /// 删除指定的用户记录 /// </summary> public void DeleteUserInfo() { try { //接收要删除的用户编号 Console.WriteLine("请输入删除的用户编号:"); string strUserId = Console.ReadLine(); int iUserId = Convert.ToInt32(strUserId); //按用户编号查询要删除的用户记录 Console.WriteLine("将要删除的用户信息是:"); SqlDataReader reader = _dbHandle.GetUserByID(iUserId); if (reader == null) { Console.WriteLine(EXCEPT); return; } //确认是否要删除用户记录 DisplayUserInfo(reader); Console.WriteLine("要删除该用户记录吗?(Y/N)"); if (Console.ReadLine().Trim().ToUpper() != "Y") { Console.WriteLine("退出删除操作!"); return; } //执行删除操作 int iRet = _dbHandle.DeleteUserInfo(iUserId); if (iRet == -1) { Console.WriteLine(ERRMSG); } else { Console.WriteLine("删除成功!"); } } catch (Exception ex) { Console.WriteLine("删除失败:" + ex.Message); } } #endregion #region 是否退出 /// <summary> /// 是否退出 /// </summary> /// <returns>true:是;false:否</returns> 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; } } #endregion } }
3.管理员登录
管理员登录后只有选择“退出”后窗口关闭 对于管理员的非法操作要给出友好提示 对于数据库的操作要有异常处理功能
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace QQUserManageSystem { class Program { static void Main(string[] args) { //管理员登录 UserManager manger = new UserManager(); manger.Login(); } } }
QQ用户信息管理系统所涉及的技能点
掌握C#语法 掌握类、对象和方法的综合运用
掌握数据库、表的创建 掌握使用T-SQL语句操作和查询数据
掌握使用ADO.NET操作数据库
能够使用异常处理增加代码的安全性
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