17章
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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Data.SqlClient;namespace ConsoleApplication1{ class Class1 { //用户登录和调用 public void yonghu() { string strsql = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True"; SqlConnection conn=new SqlConnection(strsql); for (int i = 0; i < 3; i++) { conn.Open(); Console.WriteLine("请输入用户名"); string z = Console.ReadLine(); Console.WriteLine("请输入密码"); string pwd = Console.ReadLine(); try { string stri = "select count(*) from admin where LoginId='" + z + "'and LoginPwd='" + pwd + "'"; SqlCommand comm = new SqlCommand(stri, conn); // Console.WriteLine(sb.ToString()); int j = (int)comm.ExecuteScalar(); if (j != 0) { Console.WriteLine("成功"); biao(); break; } else { Console.WriteLine("失败"); } } catch (Exception e) { Console.WriteLine(e.Message); } finally { conn.Close(); } } } //显示和控制系统菜单 public void biao() { bool b=true; do { Console.WriteLine("=============欢迎登陆QQ用户信息管理=================="); Console.WriteLine("-----------------请选择菜单单项----------------------"); Console.WriteLine("1.显示用户清单"); Console.WriteLine("2.更新在线天数"); Console.WriteLine("3.添加用户新纪录"); 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("======================================================"); Console.WriteLine("请输入:"); int a = int.Parse(Console.ReadLine()); switch (a) { case 1: xs(); break; case 2: ts(); break; case 3: zt(); break; case 4: dj(); break; case 5: sc(); break; case 0: Console.WriteLine("是否退出?(1/2)"); int yi = int.Parse(Console.ReadLine()); if (yi == 1) { b = false; Console.WriteLine("输入任意键继续"); Console.ReadLine(); b=true; } else { b = true; } break; default: break; } } while (b); } //显示用户清单的运行结果 public void xs(){ string stri = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True"; SqlConnection conn = new SqlConnection(stri); conn.Open(); string s = "select * from UserInfo u inner join Level l on l.LevelId=u.levelid"; SqlCommand comm = new SqlCommand(s,conn); SqlDataReader d = comm.ExecuteReader(); Console.WriteLine("ID 姓名 密码 等级 邮箱 在线天数 "); while(d.Read()){ Console.WriteLine(d["UserId"] + " " + d["UserName"] + " " + d["UserPwd"] + " " + d["LevelName"] + " " + d["Email"] + " " + d["OnLineDay"] + " "); } d.Close(); conn.Close(); Console.ReadLine(); } //更新用户的在线天数 public void ts() { string stri = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True"; SqlConnection conn = new SqlConnection(stri); conn.Open(); Console.WriteLine("请输入用户编号:"); string shu= Console.ReadLine(); Console.WriteLine("请输入新的在线天数"); string shu1=Console.ReadLine(); string s = "update UserInfo set onLineDay ='"+shu1+"' where UserId='" + shu + "'"; SqlCommand comm = new SqlCommand(s, conn); int i = comm.ExecuteNonQuery(); if (i == 1) { Console.WriteLine("成功"); } else { Console.WriteLine("失败"); } conn.Close(); } //添加用户新纪录 public void zt() { string stri = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True"; SqlConnection conn = new SqlConnection(stri); conn.Open(); Console.WriteLine("请输入用户昵称:"); string nc = Console.ReadLine(); Console.WriteLine("请输入密码:"); string mm = Console.ReadLine(); Console.WriteLine("请输入邮箱地址:"); string yx = Console.ReadLine(); string s = "insert into UserInfo (UserName,UserPwd,Email) values('"+nc+"', '"+mm+"', '"+yx+"' ) " ; SqlCommand comm = new SqlCommand(s, conn); int i = comm.ExecuteNonQuery(); if (i == 1){ string a = "select userid from userinfo where userName='"+nc+"'"; SqlCommand com = new SqlCommand(a, conn); int j = (int)com.ExecuteScalar(); Console.WriteLine("成功"); Console.WriteLine("更新编号是"+j); }else{ Console.WriteLine("失败"); } } //更新用户等级 public void dj() { string stri = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True"; SqlConnection conn = new SqlConnection(stri); conn.Open(); StringBuilder sb = new StringBuilder(); sb.AppendLine("update userinfo set levelid=1 where OnLineDay<5 and OnLineDay>0"); sb.AppendLine("update userinfo set levelid=2 where OnLineDay<32 and OnLineDay>5"); sb.AppendLine("update userinfo set levelid=3 where OnLineDay<320 and OnLineDay>32"); sb.AppendLine("update userinfo set levelid=4 where OnLineDay>320"); SqlCommand comm = new SqlCommand(sb.ToString(), conn); int j = comm.ExecuteNonQuery(); if(0<=j){ Console.WriteLine("本次更新用户记录"+j); Console.WriteLine("输入任意键返回上一页"); Console.ReadLine(); }else{ Console.WriteLine("失败"); } } //删除用户信息 public void sc( ) { string stri = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True"; SqlConnection conn = new SqlConnection(stri); conn.Open(); Console.WriteLine("请输入删除用户编号:"); int shu = int.Parse(Console.ReadLine()); StringBuilder sb = new StringBuilder(); sb.AppendLine("select * from UserInfo u inner join Level l on l.LevelId=u.levelid where UserId='"+shu+"'"); SqlCommand comm = new SqlCommand(sb.ToString(), conn); SqlDataReader d = comm.ExecuteReader(); Console.WriteLine("-----------------------------------------------------------------------------"); Console.WriteLine("ID 姓名 密码 等级 邮箱 在线天数 "); Console.WriteLine("-----------------------------------------------------------------------------"); d.Read(); Console.WriteLine(d["UserId"] + " " + d["UserName"] + " " + d["UserPwd"] + " " + d["LevelName"] + " " + d["Email"] + " " + d["OnLineDay"] + " "); Console.WriteLine("-----------------------------------------------------------------------------"); san(shu ); d.Close(); conn.Close(); Console.ReadLine(); } public int san(int a) { string stri = "Data Source=.;Initial Catalog=QQDB;Integrated Security=True"; SqlConnection conn = new SqlConnection(stri); StringBuilder sb = new StringBuilder(); conn.Open(); Console.WriteLine("要删除该用户吗(1/2)"); int i = int.Parse(Console.ReadLine()); if (i == 1) { string s = "delete from UserInfo where UserId='" + a + "'"; SqlCommand comm1 = new SqlCommand(s, conn); int j = comm1.ExecuteNonQuery(); Console.WriteLine(j); Console.WriteLine("成功"); } else { Console.WriteLine("失败"); } conn.Close(); Console.ReadLine(); return a; } }}using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Data.SqlClient;namespace ConsoleApplication1{ class Program { static void Main(string[] args) { Class1 c = new Class1(); c.yonghu(); Console.ReadLine(); } }} 0 0
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