using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace 实体类_数据访问类.App_Code
{public class Users{private int _code;/// <summary>/// code/// </summary>public int Code{get { return _code; }set { _code = value; }}private string _usename;/// <summary>/// 用户名/// </summary>public string Usename{get { return _usename; }set { _usename = value; }}private string _password;/// <summary>/// 用户密码/// </summary>public string Password{get { return _password; }set { _password = value; }}private string _nick;/// <summary>/// 昵称/// </summary>public string Nick{get { return _nick; }set { _nick = value; }}private bool _sex;/// <summary>/// 性别/// </summary>public bool Sex{get { return _sex; }set { _sex = 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 _class1{get { return _class; }set { _class = value; }}private DateTime _birthday;/// <summary>/// 生日/// </summary>public DateTime Birthday{get { return _birthday; }set { _birthday = value; }}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;namespace 实体类_数据访问类.App_Code
{public class UserDate{SqlConnection conn = null;SqlCommand com = null;public UserDate(){conn = new SqlConnection("server=.;database=Data1128;user=sa;pwd=123");com = conn.CreateCommand();}/// <summary>/// 将数据添加到Users表中，添加成功返回true,失败返回false/// </summary>/// <param name="u">要添加到表中的Users对象</param>/// <returns>添加成功返回true,失败返回false</returns>public bool insert(Users u){bool ok = false;int count = 0;com.CommandText = "insert into Users values(@usename,@password,@nick,@sex,@nation,@class,@birthday)";com.Parameters.Clear();com.Parameters.AddWithValue("@usename",u.Usename);com.Parameters.AddWithValue("@password", u.Password);com.Parameters.AddWithValue("@nick", u.Nick);com.Parameters.AddWithValue("@sex", u.Sex);com.Parameters.AddWithValue("@nation", u.Nation);com.Parameters.AddWithValue("@class", u._class1);com.Parameters.AddWithValue("@birthday", u.Birthday);try{conn.Open();count=com.ExecuteNonQuery();}catch{ok = false;}finally{conn.Close();}if(count>0){ok = true;}return ok;}/// <summary>/// 通过泛型集合对数据进行查询/// </summary>/// <returns>返回一个集合</returns>public List<Users> Select(){List<Users> list= new List<Users>();com.CommandText = "select *from Users";conn.Open();SqlDataReader dr = com.ExecuteReader();if(dr.HasRows){while(dr.Read()){Users u = new Users();u.Code = Convert.ToInt32(dr["code"]);u.Usename = dr["usename"].ToString();u.Password = dr["password"].ToString();u.Nick = dr["nick"].ToString();u.Sex = Convert.ToBoolean(dr["sex"]);u.Nation = dr["nation"].ToString();u._class1 = dr["class"].ToString();u.Birthday = Convert.ToDateTime(dr["birthday"]);list.Add(u);}}conn.Close();return list;}/// <summary>/// 根据usename进行查询/// </summary>/// <param name="usename">要查询的usename对象</param>/// <returns>返回bool类型的值，返回true表示有usename这条数据</returns>public bool select(string usename){bool has = false;com.CommandText = "select *from Users where usename=@usename";com.Parameters.Clear();com.Parameters.AddWithValue("@usename",usename);conn.Open();SqlDataReader dr = com.ExecuteReader();if(dr.HasRows){has = true;}conn.Close();return has;}//public void delete(string username)//{//    com.CommandText = "delete from Users where usename=@usename";//    com.Parameters.Clear();//    com.Parameters.AddWithValue("@usename", username);//    conn.Open();//    com.ExecuteNonQuery();//    conn.Close();//}/// <summary>/// 删除数据/// </summary>/// <param name="username">要查询的usename对象</param>/// <returns>返回bool类型的值，返回true表示删除成功</returns>public bool delete(string username){bool have = false;int cc = 0;com.CommandText = "delete from Users where usename=@usename";com.Parameters.Clear();com.Parameters.AddWithValue("@usename", username);try{conn.Open();cc = com.ExecuteNonQuery();}catch{have = false;}finally{conn.Close();}if (cc > 0){have = true;}return have;}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using 实体类_数据访问类.App_Code;namespace 实体类_数据访问类
{class Program{static void Main(string[] args){//完整查询操作，创建泛型数组引用UsersDate的Select方法List<Users> ulist = new UserDate().Select();//遍历数组foreach(Users uuu in ulist){Console.WriteLine(uuu.Code+"\t"+uuu.Usename+"\t"+uuu.Password+"\t"+uuu.Nick+"\t"+uuu.Sex+"\t"+uuu.Nation+"\t"+uuu._class1+"\t"+uuu.Birthday);}//完整删除操作Console.WriteLine("请输入要删除的用户名：");string uname = Console.ReadLine();//select方法的返回值为true，说明有此用户if (new UserDate().select(uname)){Console.WriteLine("已查到此用户信息，是否要删除？(Y/N)");//用户操作string yn = Console.ReadLine();if (yn.ToUpper() == "Y"){//delete方法的返回值为true，删除成功if (new UserDate().delete(uname))Console.WriteLine("删除成功！");//delete方法的返回值为false，删除失败elseConsole.WriteLine("删除失败！");}else{Console.WriteLine("取消删除！！");}}//select方法的返回值为false，无此用户else{Console.WriteLine("未查到此用户信息！！");}//Console.WriteLine("请输入要删除的用户名：");//string uname = Console.ReadLine();//if (new UserDate().select(uname))//{//    Console.WriteLine("已查到此用户信息，是否要删除？(Y/N)");//    string yn = Console.ReadLine();//    if (yn.ToUpper() == "Y")//    {//        new UserDate().delete(uname);//            Console.WriteLine("删除成功！");//    }//    else//    {//        Console.WriteLine("取消删除！！");//    }//}//else//{//    Console.WriteLine("未查到此用户信息！！");//}//添加用户操作Users user = new Users();Console.WriteLine("请输入用户名：");user.Usename = Console.ReadLine();Console.WriteLine("请输入密码：");user.Password = Console.ReadLine();Console.WriteLine("请输入昵称：");user.Nick = Console.ReadLine();Console.WriteLine("请输入性别：");user.Sex = Convert.ToBoolean(Console.ReadLine());Console.WriteLine("请输入民族：");user.Nation = Console.ReadLine();Console.WriteLine("请输入班级：");user._class1 = Console.ReadLine();Console.WriteLine("请输入生日：");user.Birthday = Convert.ToDateTime(Console.ReadLine());UserDate ud = new UserDate();bool isok= ud.insert(user);//数据访问类中insert方法的返回值if (isok)Console.WriteLine("添加成功！");elseConsole.WriteLine("添加失败！！");Console.ReadLine();}}
}