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重要！！！实体类、数据访问类
创建两个类：
users类：
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 _Ids;
/// <summary>
/// ids
/// </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; }
}
}
}
usersdata：
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 UsersData
{
SqlConnection conn = null;
SqlCommand cmd = null;
public UsersData()
{
conn = new SqlConnection("server=.;database=Data0928;user=sa;pwd=123");
cmd = conn.CreateCommand();
}
/// <summary>
/// 将数据添加到Users表中，返回true说明添加成功
/// </summary>
/// <param name="u">要添加到数据表中的Users对象</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; }
finally
{
conn.Close();
}
if (count > 0)
ok = true;
return ok;
}
//查询数据库表中所有数据
public List<Users> Select()
{
List<Users> list = new List<Users>();
cmd.CommandText = "select *from Users";
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
while (dr.Read())
{
Users u = new Users();
u.Ids = Convert.ToInt32(dr["ids"]);
u.UserName = dr["UserName"].ToString();
u.PassWord = dr["PassWord"].ToString();
u.NickName = dr["NickName"].ToString();
u.Sex = Convert.ToBoolean(dr["Sex"]);
u.Birthday = Convert.ToDateTime(dr["Birthday"]);
u.Nation = dr["Nation"].ToString();
u.Class = dr["Class"].ToString();
list.Add(u);
}
}
conn.Close();
return list;
}
//查询指定用户名的数据
public bool Select(string username)
{
bool ok = false;
cmd.CommandText = "select *from Users where UserName = @a";
cmd.Parameters.Clear();
cmd.Parameters.Add("@a",username);
Users u = new Users();
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
while (dr.Read())
{
u.Ids = Convert.ToInt32(dr["ids"]);
u.UserName = dr["UserName"].ToString();
u.PassWord = dr["PassWord"].ToString();
u.NickName = dr["NickName"].ToString();
u.Sex = Convert.ToBoolean(dr["Sex"]);
u.Birthday = Convert.ToDateTime(dr["Birthday"]);
u.Nation = dr["Nation"].ToString();
u.Class = dr["Class"].ToString();
ok = true;
}
}
conn.Close();
return ok;
}
//删除数据
public void Delete(string uname)
{
cmd.CommandText = "delete from Users where UserName = @a";
cmd.Parameters.Clear();
cmd.Parameters.Add("@a",uname);
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
}
}
}
main函数中调用方法：
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)
{
//list<users> ulist=new list<users>;
//userdata da=new userdata();
//ulist=da.select();
List<Users> ulist = new UsersData().Select();
foreach (Users uuu in ulist)
{
Console.WriteLine(uuu.Ids + " " + uuu.UserName + " " + uuu.PassWord + " " + uuu.NickName + " " + uuu.Sex + " " + uuu.Birthday + " " + uuu.Nation + " " + uuu.Class);
}
Console.Write("请输入要删除的用户名：");
string uname = Console.ReadLine();
if (new UsersData().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 UsersData().Delete(uname);
Console.WriteLine("删除成功！");
}
}
Users user = new Users();
Console.Write("请输入用户名：");
user.UserName = Console.ReadLine();
Console.Write("请输入密码：");
user.PassWord = Console.ReadLine();
Console.Write("请输入昵称：");
user.NickName = Console.ReadLine();
Console.Write("请输入性别：");
user.Sex = Convert.ToBoolean(Console.ReadLine());
Console.Write("请输入生日：");
user.Birthday = Convert.ToDateTime(Console.ReadLine());
Console.Write("请输入民族：");
user.Nation = Console.ReadLine();
Console.Write("请输入班级：");
user.Class = Console.ReadLine();
UsersData ud = new UsersData();
bool isok = ud.Insert(user);
if (isok)
Console.WriteLine("添加成功！");
else
Console.WriteLine("添加失败！");
Console.ReadKey();
}
}
}
重要！！！实体类、数据访问类
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