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综合防攻击、实体类、数据访问类进行的练习
主程序：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using 数据库操作.App_Code; namespace 数据库操作 { class Program { static void Main(string[] args) { for (; ; ) { Console.Write("请输入操作序号：1、查询 2、添加 3、删除 4、修改"); string code = Console.ReadLine();//code为操作序号 if (code == "1")//查询 { for (; ; ) { Console.Write("请输入想要查询的用户名（输入*查看全部，输入#返回）："); string code1 = Console.ReadLine();//code1为查询中的操作序号或所输的第一个用户名 if (code1 == "*")//如果输入* 查看全部数据 { List<Users> se = new UsersData().Select(); Console.WriteLine("============================数据信息=============================="); Console.WriteLine("序号\t用户名\t\t密码\t昵称\t性别\t生日\t\t民族\t班级"); foreach (Users uuu in se) { Console.WriteLine(uuu.Ids + "\t" + uuu.UserName + "\t" + uuu.PassWord + "\t" + uuu.NickName + "\t" + (uuu.Sex ? "男" : "女") + "\t" + Convert.ToDateTime(uuu.Birthday).ToShortDateString() + "\t" + uuu.Nation + "\t" + uuu.Class); } } else if (code1 == "#")//输入#返回 { break; } else//如果输入的是第一个用户名 { List<string> users = new List<string>();//users泛型集合用于存放多个用户名 int bia = 0;//标记变量 用于检测第一个用户名是否重复 如果不重复 将此用户名放入集合 标记变量+1 后续不再执行此部分 for (; ; ) { if (bia == 0) { if (new UsersData().Select(code1)) { users.Add(code1); bia++; } else { Console.Write("查无此用户，请重新输入！"); bia++; continue; } } Console.Write("请继续输入想要查询的用户名（输入0结束输入）："); string names = Console.ReadLine(); if (names == "0")//如果输入0则跳出录入用户名的循环 { break; } else//如果输入的是其他用户名 { if (new UsersData().Select(names))//判断数据库中有无此用户名 { int count = users.Count(); int biao = 0;//标记变量biao for (int i = 0; i < count; i++)//集合中若已经有此用户名则biao+1 { if (users[i] == names) { biao++; } } if (biao == 0)//biao为0，users集合中无此用户 { users.Add(names);//将此用户名添加到users集合中 continue; } else//users集合中已经有此用户名 { Console.Write("输入用户名重复，请重新输入！"); continue; } } else//数据库中没有此用户名 { Console.WriteLine("查无此用户，请重新输入！"); } } } //用户名录入完毕，开始查询 if (users.Count() > 0)//users集合不为空 { List<Users> us = new UsersData().Select(users);//设置us集合接受多个返回的数据库中的数据 Console.WriteLine("============================数据信息=============================="); Console.WriteLine("序号\t用户名\t\t密码\t昵称\t性别\t生日\t\t民族\t班级"); foreach (Users uuu in us)//使用遍历将us集合中的数据全部打印 { Console.WriteLine(uuu.Ids + "\t" + uuu.UserName + "\t" + uuu.PassWord + "\t" + uuu.NickName + "\t" + (uuu.Sex ? "男" : "女") + "\t" + Convert.ToDateTime(uuu.Birthday).ToShortDateString() + "\t" + uuu.Nation + "\t" + uuu.Class); } } else//users集合为空 { Console.WriteLine("没有查询任何用户信息！"); break; } } } } else if (code == "2")//添加 { for (; ; ) { Console.Write("请输入想要添加的用户名（输入#返回）："); string user = Console.ReadLine(); if (user=="#") { break; } else if(!(new UsersData().Select(user)))//如果数据库中没有此用户 { Users u = new UsersData().enter();//录入用户除用户名以外的所有信息，并储存到u中 u.UserName = user;//将刚才的用户名录入到u中 bool ok = new UsersData().Insert(u); if (ok) { Console.WriteLine("添加数据成功！"); continue; } else Console.WriteLine("添加失败！"); } else//数据库中已有此用户名 { Console.Write("输入用户名已存在，请重新输入！"); continue; } } } else if (code == "3")//删除 { for (; ; ) { Console.Write("请输入想要删除的用户名（输入#返回）："); string user = Console.ReadLine(); if(user=="#") { break; } else if (new UsersData().Select(user)) { Users u = new UsersData().SelectOne(user); Console.WriteLine("============================数据信息=============================="); Console.WriteLine("序号\t用户名\t\t密码\t昵称\t性别\t生日\t\t民族\t班级"); Console.WriteLine(u.Ids + "\t" + u.UserName + "\t" + u.PassWord + "\t" + u.NickName + "\t" + (u.Sex ? "男" : "女") + "\t" + Convert.ToDateTime(u.Birthday).ToShortDateString() + "\t" + u.Nation + "\t" + u.Class); for (; ; ) { Console.Write("是否确定删除此条数据（Y/N）："); string yn = Console.ReadLine(); if (yn.ToUpper() == "Y") { bool ok = new UsersData().Delete(user); if (ok) { Console.WriteLine("删除成功！"); break; } else { Console.WriteLine("删除失败！"); break; } } else if (yn.ToUpper() == "N") { Console.WriteLine("已取消删除。"); break; } else { Console.Write("输入有误，请重新输入！"); continue; } } } else { Console.Write("输入用户名不存在，请重新输入！"); continue; } } } else if (code == "4")//修改 { for (; ; ) { Console.Write("请输入想要修改的用户名（输入#返回）："); string user = Console.ReadLine(); if(user=="#") { break; } else if(new UsersData().Select(user)) { Users u = new UsersData().SelectOne(user); Console.WriteLine("============================数据信息=============================="); Console.WriteLine("序号\t用户名\t\t密码\t昵称\t性别\t生日\t\t民族\t班级"); Console.WriteLine(u.Ids + "\t" + u.UserName + "\t" + u.PassWord + "\t" + u.NickName + "\t" + (u.Sex ? "男" : "女") + "\t" + Convert.ToDateTime(u.Birthday).ToShortDateString() + "\t" + u.Nation + "\t" + u.Class); for (; ; ) { Console.Write("是否确定修改此条数据（Y/N）："); string yn = Console.ReadLine(); if(yn.ToUpper()=="Y") { Users us = new UsersData().enter(); us.UserName = user; bool ok = new UsersData().Update(us); if (ok) { Console.WriteLine("修改成功！"); break; } else { Console.WriteLine("修改失败！"); break; } } else if (yn.ToUpper() == "N") { Console.WriteLine("已取消修改。"); break; } else { Console.Write("输入有误，请重新输入！"); continue; } } } else { Console.Write("输入用户名不存在，请重新输入！"); continue; } } } else { Console.WriteLine("输入操作序号有误，请重新输入！"); continue; } } } } }
实体类：
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace 数据库操作.App_Code { public class Users { private int _Ids; /// <summary> /// 用户ID /// </summary> public int Ids { get { return _Ids; } set { _Ids = value; } } private string _UserName; /// <summary> /// 用户名 /// </summary> public string UserName { get { return _UserName; } set { _UserName = value; } } private string _PassWord; /// <summary> /// 密码 /// </summary> public string PassWord { get { return _PassWord; } set { _PassWord = value; } } private string _NickName; /// <summary> /// 昵称 /// </summary> public string NickName { get { return _NickName; } set { _NickName = value; } } private bool _Sex; /// <summary> /// 性别 /// </summary> public bool Sex { get { return _Sex; } set { _Sex = value; } } private DateTime _Birthday; /// <summary> /// 生日 /// </summary> public DateTime Birthday { get { return _Birthday; } set { _Birthday = value; } } private string _Nation; /// <summary> /// 民族 /// </summary> public string Nation { get { return _Nation; } set { _Nation = value; } } private string _Class; /// <summary> /// 班级 /// </summary> public string Class { get { return _Class; } set { _Class = value; } } } }
数据访问类：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.SqlClient; namespace 数据库操作.App_Code { public class UsersData { SqlConnection conn = null; SqlCommand cmd = null; public UsersData() { conn=new SqlConnection("server=.;database=Data0928;user=sa;pwd=123"); cmd=conn.CreateCommand(); } /// <summary> /// 查询所有数据 /// </summary> /// <returns></returns> public List<Users> Select() { List<Users> ud = new List<Users>(); cmd.CommandText = "select ids,UserName,PassWord,NickName,Sex,Birthday,(select NationName from Nation where NationCode=Users.Nation) as ‘Nation‘ ,ClassName as ‘Class‘ from Users join Class on Class.ClassCode=Users.Class"; conn.Open(); SqlDataReader rd = cmd.ExecuteReader(); if(rd.HasRows) { while(rd.Read()) { Users user = new Users(); user.Ids =Convert.ToInt32(rd["ids"]); user.UserName = rd["UserName"].ToString(); user.PassWord = rd["PassWord"].ToString(); user.NickName = rd["NickName"].ToString(); user.Sex = Convert.ToBoolean(rd["Sex"]); user.Birthday = Convert.ToDateTime(rd["Birthday"]); user.Nation = rd["Nation"].ToString(); user.Class = rd["Class"].ToString(); ud.Add(user); } } conn.Close(); return ud; } /// <summary> /// 查询多个用户的数据 /// </summary> /// <param name="users"></param> /// <returns></returns> public List<Users> Select(List<string> users) { List<Users> us = new List<Users>(); int count = users.Count(); for (int i = 0; i < count; i++) { cmd.CommandText = "select ids,UserName,PassWord,NickName,Sex,Birthday,(select NationName from Nation where NationCode=Users.Nation) as ‘Nation‘ ,ClassName as ‘Class‘ from Users join Class on Class.ClassCode=Users.Class where UserName=@uname"; cmd.Parameters.Clear(); cmd.Parameters.AddWithValue("@uname", users[i].ToString()); conn.Open(); SqlDataReader rd = cmd.ExecuteReader(); if (rd.HasRows) { while (rd.Read()) { Users user = new Users(); user.Ids = Convert.ToInt32(rd["ids"]); user.UserName = rd["UserName"].ToString(); user.PassWord = rd["PassWord"].ToString(); user.NickName = rd["NickName"].ToString(); user.Sex = Convert.ToBoolean(rd["Sex"]); user.Birthday = Convert.ToDateTime(rd["Birthday"]); user.Nation = rd["Nation"].ToString(); user.Class = rd["Class"].ToString(); us.Add(user); } } conn.Close(); } return us; } /// <summary> /// 判断有无此用户名 /// </summary> /// <param name="name"></param> /// <returns></returns> public bool Select(string name) { bool has =false; cmd.CommandText="select * from Users where UserName=@user"; cmd.Parameters.Clear(); cmd.Parameters.AddWithValue("@user",name); conn.Open(); SqlDataReader rd = cmd.ExecuteReader(); if(rd.HasRows) { has = true; } conn.Close(); return has; } /// <summary> /// 查询单行数据并返回Users对象 /// </summary> /// <param name="name"></param> /// <returns></returns> public Users SelectOne(string name) { Users user = new Users(); cmd.CommandText = "select ids,UserName,PassWord,NickName,Sex,Birthday,(select NationName from Nation where NationCode=Users.Nation) as ‘Nation‘ ,ClassName as ‘Class‘ from Users join Class on Class.ClassCode=Users.Class where UserName=@a"; cmd.Parameters.Clear(); cmd.Parameters.AddWithValue("@a",name); conn.Open(); SqlDataReader rd = cmd.ExecuteReader(); if (rd.HasRows) { while (rd.Read()) { user.Ids = Convert.ToInt32(rd["ids"]); user.UserName = rd["UserName"].ToString(); user.PassWord = rd["PassWord"].ToString(); user.NickName = rd["NickName"].ToString(); user.Sex = Convert.ToBoolean(rd["Sex"]); user.Birthday = Convert.ToDateTime(rd["Birthday"]); user.Nation = rd["Nation"].ToString(); user.Class = rd["Class"].ToString(); } } conn.Close(); return user; } /// <summary> /// 插入数据 /// </summary> /// <param name="u"></param> /// <returns></returns> public bool Insert(Users u) { bool ok = false; int count = 0; cmd.CommandText = "insert into Users values(@a,@b,@c,@d,@e,@f,@g)"; cmd.Parameters.Clear(); cmd.Parameters.AddWithValue("@a", u.UserName); cmd.Parameters.AddWithValue("@b", u.PassWord); cmd.Parameters.AddWithValue("@c", u.NickName); cmd.Parameters.AddWithValue("@d", u.Sex); cmd.Parameters.AddWithValue("@e", u.Birthday); cmd.Parameters.AddWithValue("@f", u.Nation); cmd.Parameters.AddWithValue("@g", u.Class); try { conn.Open(); count = cmd.ExecuteNonQuery(); } catch { ok = false; } conn.Close(); if (count > 0) ok = true; return ok; } /// <summary> /// 获取一个Users除用户名以外的数据 /// </summary> /// <returns></returns> public Users enter() { Users u = new Users(); for (; ; ) { Console.Write("请输入密码（6到18位）："); string pwd1 = Console.ReadLine(); if (pwd1.Length >= 6 && pwd1.Length <= 18) { u.PassWord = pwd1; break; } else { Console.WriteLine("密码长度不正确，请重新输入！"); continue; } } Console.Write("请输入昵称："); u.NickName= Console.ReadLine(); for (; ; ) { Console.Write("请输入性别（请输入男女或者0、1）："); string sex1 = Console.ReadLine(); if (sex1 == "0" || sex1 == "女") { u.Sex = false; break; } else if (sex1 == "男" || sex1 == "1") { u.Sex = true; break; } else { Console.WriteLine("性别输入有误，请重新输入！"); continue; } } for (; ; ) { Console.Write("请输入生日："); try { u.Birthday = DateTime.Parse(Console.ReadLine()); break; } catch { Console.WriteLine("生日日期输入有误，请重新输入！"); continue; } } for (; ; ) { Console.Write("请输入民族："); string nation1 = Console.ReadLine(); if (nation1 == "汉族" || nation1 == "汉") { u.Nation = "N001"; break; } else if (nation1 == "满族" || nation1 == "满") { u.Nation = "N002"; break; } else if (nation1 == "藏族" || nation1 == "藏") { u.Nation = "N003"; break; } else if (nation1 == "彝族" || nation1 == "彝") { u.Nation = "N004"; break; } else { Console.WriteLine("输入民族有误，请重新输入！"); continue; } } for (; ; ) { Console.Write("请输入班级："); string cla1 = Console.ReadLine(); if (cla1 == "一班" || cla1 == "一") { u.Class= "C001"; break; } else if (cla1 == "二班" || cla1 == "二") { u.Class = "C002"; break; } else if (cla1 == "三班" || cla1 == "三") { u.Class = "C003"; break; } else if (cla1 == "四班" || cla1 == "四") { u.Class = "C004"; break; } else { Console.WriteLine("输入班级有误，请重新输入！"); continue; } } return u; } /// <summary> /// 通过用户名删除一条数据 /// </summary> /// <param name="name"></param> /// <returns></returns> public bool Delete(string name) { bool ok = false; cmd.CommandText = "delete from Users where UserName=@a"; cmd.Parameters.Clear(); cmd.Parameters.AddWithValue("@a",name); conn.Open(); int i = cmd.ExecuteNonQuery(); conn.Close(); if (i > 0) ok = true; else ok = false; return ok; } /// <summary> /// 修改数据 /// </summary> /// <param name="u"></param> /// <returns></returns> public bool Update(Users u) { bool ok = false; cmd.CommandText = "update Users set PassWord=@a,NickName=@b,Sex=@c,Birthday=@d,Nation=@e,Class=@f where UserName=@g"; cmd.Parameters.Clear(); cmd.Parameters.AddWithValue("@a",u.PassWord); cmd.Parameters.AddWithValue("@b", u.NickName); cmd.Parameters.AddWithValue("@c", u.Sex); cmd.Parameters.AddWithValue("@d", u.Birthday); cmd.Parameters.AddWithValue("@e", u.Nation); cmd.Parameters.AddWithValue("@f", u.Class); cmd.Parameters.AddWithValue("@g", u.UserName); conn.Open(); int i = cmd.ExecuteNonQuery(); conn.Close(); if (i > 0) ok = true; else ok = false; return ok; } } }
综合防攻击、实体类、数据访问类进行的练习
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