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 [email protected]";
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 [email protected]";
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 [email protected]";
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 [email protected]";
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 [email protected],[email protected],[email protected],[email protected],[email protected],[email protected] where [email protected]";
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;
}
}
}
时间： 2024-12-28 11:27:43