一、页面设计
一共四个页面
主页面Form1，登录页面login，注册页面resister，主菜单页面main_page
系统运行进入Form1，单击登录按钮跳转到login，数据库中得存在数据信息且输入正确才可登录成功，跳转到main_page
单击注册按钮跳转到register，用户需要注册账号、密码、性别、手机号信息
Form1
login
register
main_page
四个页面如下
二、数据库的创建
创建fiber_yy数据库，在其下创建yy_user表，其中id为主键自增
整体结构如下
三、相关代码
Form1代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.Sql;
using System.Data.SqlClient;
namespace fiber_yy
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void label2_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
this.Hide();
new login().Show();
}
private void button3_Click(object sender, EventArgs e)
{
MessageBox.Show("see you again~");
Application.Exit(); //退出进程
}
private void button2_Click(object sender, EventArgs e)
{
this.Hide();
new register().Show();
}
}
}
login代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.Sql;
using System.Data.SqlClient;
namespace fiber_yy
{
public partial class login : Form
{
public static string str_conn = "server=CY-20190824RMES;Initial Catalog=fiber_yy;User ID=sa;pwd=beyond";
SqlConnection conn = new SqlConnection(str_conn);
//server为主机名称，Initial Catalog为数据库名称，User ID不需要变动都是sa，pwd为创建数据库时设置的密码 第一篇博文有讲解
public login()
{
InitializeComponent();
conn.Open();
}
private void button1_Click(object sender, EventArgs e)//登录
{
string username = textBox1.Text;
string password = textBox2.Text;
if (username.Equals("") || password.Equals(""))
{
MessageBox.Show("提示：请输入用户名、密码！", "警告");
}
else
{
string sqlSel = "select count(*) from yy_user where username = '" + username + "' and password = '" + password + "'";
SqlCommand cmd = new SqlCommand(sqlSel, conn);
if (Convert.ToInt32(cmd.ExecuteScalar()) > 0 )
{
this.Close();
MessageBox.Show("用户登录成功");
new main_page().Show();
}
else
{
MessageBox.Show("用户登录失败");
}
}
}
}
}
register代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.Sql;
using System.Data.SqlClient;
namespace fiber_yy
{
public partial class register : Form
{
public static string str_conn = "server=CY-20190824RMES;Initial Catalog=fiber_yy;User ID=sa;pwd=beyond";
SqlConnection conn = new SqlConnection(str_conn);
public register()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string sex="man";
long phone_number;
int account_number, password, sum=0;
account_number = textBox1.Text.Length;
password = textBox2.Text.Length;
phone_number = long.Parse(textBox3.Text);
if (account_number <= 3 || account_number >= 16)
{
label6.Text = "账号长度应该在3~16字符之间";
sum++;
}
else
{
label6.Text = "校验成功";
}
if (password <= 3 || password >= 16)
{
label7.Text = "密码长度应该在3~16字符之间";
sum++;
}
else
{
label7.Text = "校验成功";
}
if (radioButton1.Checked)
{
sex = "man";
}
else if (radioButton2.Checked)
{
sex = "woman";
}
if (phone_number < 10000000000 || phone_number > 99999999999)
{
label9.Text = "请输入正确的手机号";
sum++;
}
else
{
label9.Text = "校验成功";
}
if (sum == 0)
{
label6.Text = "√";
label7.Text = "√";
label8.Text = "√";
label9.Text = "√";
try
{
string sql = string.Format("select count(*) from yy_user where username='{0}'", textBox1.Text);
SqlCommand cmd = new SqlCommand(sql, conn);
conn.Open();
int a = (int)cmd.ExecuteScalar();//返回一个值，看用户是否存在 1存在 0不存在
StringBuilder strsql = new StringBuilder();
//MessageBox.Show(a.ToString());
if(a==1)
{
MessageBox.Show("用户名已存在");
}
else
{
MessageBox.Show("okk");
//string INSERT_sql = string.Format("INSERT INTO user_yy VALUES ('{0}','{1}')", textBox1.Text,textBox2.Text);
string INSERT_sql = string.Format("INSERT INTO yy_user VALUES ('{0}','{1}','{2}','{3}')", textBox1.Text.Trim(), textBox2.Text.Trim(), sex, textBox3.Text.Trim());
SqlCommand INSERT_cmd = new SqlCommand(INSERT_sql, conn);
int count = INSERT_cmd.ExecuteNonQuery();
if (count > 0)
{
MessageBox.Show("注册成功！");
this.Close();
new Form1().Show();
}
else
{
MessageBox.Show("GG");
}
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
private void button2_Click(object sender, EventArgs e)
{
this.Close();
MessageBox.Show("用户登录成功");
new main_page().Show();
}
}
}
main_page代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace fiber_yy
{
public partial class main_page : Form
{
public main_page()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show("退出成功");
this.Close();
new Form1().Show();
}
}
}
四、效果展示
原始数据集数据信息
运行程序
注册
右击 yy_user—> 选择前1000行
已经注册成功了，接下来开始登录
随便输入一个账号
输入正确的账号
跳转到main_page
退出登录之后会返回到Form1
退出系统，提示see you again~
