超市收银系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 梦之翼小组项目
{
    public partial class denglu : Form
    {
        public denglu()
        {
            InitializeComponent();
        }
        model db = new model(); //实例化数据库对象

        private void button1_Click(object sender, EventArgs e)
        {
            string strConn = "Data Source=.;Initial Catalog=shopInfo;Integrated Security=True";    //连接数据库
            SqlConnection Connection = new SqlConnection(strConn);

            try
            {

                string sqlStr = "select userName,userPassword from register where userName=@userName";    //查询
                DataSet ds = new DataSet();

                Connection.ConnectionString = Connection.ConnectionString;
                Connection.Open();

                SqlCommand cmd = new SqlCommand(sqlStr, Connection);
                cmd.Parameters.Add(new SqlParameter("@userName", SqlDbType.VarChar, 30));  //传参
                cmd.Parameters["@userName"].Value = userName.Text;         //给user文本框赋值
                SqlDataReader dater = cmd.ExecuteReader();

                if (userName.Text.Trim() == "")         //如果user的值等于空
                {
                   MessageBox.Show( "用户名不允许为空!");

                }
                else if (passWord.Text.Trim() == "")          //同上
                {
                    MessageBox.Show( "密码不能为空!");
                }
                else if (!dater.Read())              //如果输入的用户名没有被dater读到，则用户名不存在
                {
                    MessageBox.Show( "用户名不存在！");
                    userName.Text = "";
                    passWord.Text = "";
                }
                else if (dater["userPassWord"].ToString().Trim() == passWord.Text.Trim()) //输入密码等于数据库密码登录成功且弹出音乐框
                {
                    MessageBox.Show( "登录成功！");
                    userName.Text = "";
                    passWord.Text = "";
                    caozuoyemain frm = new caozuoyemain();
                    frm.ShowDialog();
                }
                else
                {
                    MessageBox.Show("密码错误！");      //否则密码错误
                    userName.Text = "";
                    passWord.Text = "";

                }
            }
            catch (Exception)
            {
                throw;               //抛出异常
            }
            finally
            {
                Connection.Close();        //关闭数据库
            }

        }

        private void label4_Click(object sender, EventArgs e)
        {
            zhuce fra = new zhuce();
            fra.ShowDialog();
        }

        private void label6_Click(object sender, EventArgs e)
        {
            zhaohuimima fra = new zhaohuimima();
            fra.ShowDialog();
        }

        private void denglu_Load(object sender, EventArgs e)
        {

        }
    }
}

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 梦之翼小组项目
{
    public partial class caozuoyemain : Form
    {
        public caozuoyemain()
        {
            InitializeComponent();
        }
        public double totalPrice;//每种商品的总价
        public double total; //所有商品的总价
        public double shijijin;//顾客给的钱数
        public double yingzhao;// 找给顾客的钱数
        public string mingcheng;//每件商品的名称
        public double shuliang;//每件商品的数量
        public double jiage;//每件商品的价格
        public int i = 0;  //商品收费的id

        model db = new model(); //实例化数据库对象

        public void fanli() //单件物品的返利方法
        {
            if (jiage * shuliang < 600 && jiage * shuliang > 300)
            {
                totalPrice = jiage * shuliang - 100;
            }
            else
            {
                totalPrice = jiage * shuliang;
            }
        }

        private void confirm_Click(object sender, EventArgs e) //单击确定按钮的事件
        {
            totalPrice = 0;  //每一次商品的单个金额

            jiage = Convert.ToDouble(price.Text);
            shuliang = Convert.ToDouble(number.Text); //数据类型的转换
           
            switch (jisuanfangshi.SelectedIndex)
            {
                case 0:
                    totalPrice = jiage * shuliang;
                    
                    break;
                case 1:
                     totalPrice = jiage * shuliang*0.8;
                     
                    break;
                case 2:
                    fanli();  //调用单个物品的返利方法
                
                    break;
            }


            total = totalPrice + total; //所有商品的总金额

            zongjine.Text = total.ToString();//总金额转换数据类型，显示到文本框里面

           
            i++;  //每一次的商品id加1，为了调出所有商品的最后一个数据

            db.dbcon();
            try
            {
                string insertInfo = "insert wupin  values(‘" + i.ToString() + "‘,‘" + tradeName.Text + "‘,‘" + price.Text + "‘,‘" +
                    number.Text + "‘,‘" + jisuanfangshi.Text + "‘,‘" + totalPrice.ToString() + "‘)";
                db.dbInsert(insertInfo);

                string selstr = "select top "+i+" * from wupin order by 物品ID desc";
                db.dbFill(selstr);
                dataGridView1.DataSource = db.dt;        
            }
            catch (Exception)
            {
                MessageBox.Show("不好意思，信息有误，注册失败");
            }
        }      

        private void caozuoyemain_Load(object sender, EventArgs e)
        {
            db.dbcon();
            string qingkong = "TRUNCATE TABLE wupin";
            db.dbInsert(qingkong);
            jisuanfangshi.SelectedIndex = 0;      
        }

        private void jiesuan_Click(object sender, EventArgs e)
        {
            shijijin = Convert.ToDouble(shishoujine.Text);
            yingzhao=Convert.ToDouble(zongjine.Text) ;
            yingzhao = shijijin - total;
            zhaojine.Text = yingzhao.ToString()+"元";
        }

        private void resetting_Click(object sender, EventArgs e)
        {
            tradeName.Text = "";
            price.Text = "";
            number.Text = "";
        }      
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 梦之翼小组项目
{
    public partial class zhuce : Form
    {
        public zhuce()
        {
            InitializeComponent();
        }
        public string sexValue; //接收性别的字段
        model db = new model(); //实例化数据库对象

        private bool testuserName(string strUsername) //检测用户名的方法
        {
            bool strResult;// 判断结果的接收
            Regex exStrUserName = new Regex(@"^[a-zA-Z][a-zA-Z0-9]{3,8}$");
            //正则表达式的书写
            if (strResult = exStrUserName.Match(strUsername).Success)
            {
                yonghuming_test.Text = "?";
            }
            else
            {
                MessageBox.Show("用户名由3—6位的字母和数字组成，必须以字母开头");

            }
            return strResult;
        }

        private bool testPassWord(string strUsername) //检测密码的方法
        {
            bool strResult;// 判断结果的接收
            Regex exStrUserName = new Regex(@"^[\w\-~!@#$%^&*()+{}[ \]:]{6,16}");
            //正则表达式的书写
            if (strResult = exStrUserName.Match(strUsername).Success)
            {
                mima_test.Text = "?";
            }
            else
            {
                mima_test.Text = "?";
                MessageBox.Show("密码由6—16位的字母和数字或符号组成");

            }
            return strResult;
        }
        private bool testName(string strUsername) //检测姓名的方法
        {
            bool strResult;// 判断结果的接收
            Regex exStrUserName = new Regex(@"^([a-zA-Z0-9\u4e00-\u9fa5\·]{2,3})$");
            //正则表达式的书写
            if (strResult = exStrUserName.Match(strUsername).Success)
            {
                name_test.Text = "?";
            }
            else
            {
                name_test.Text = "?";
                MessageBox.Show("请文明用语，输入合法的中文姓名哦");

            }

            if (name_text.Text == "小猫" || name_text.Text == "小狗" || name_text.Text == "傻逼")
            {
                name_test.Text = "?";
                MessageBox.Show("请文明用语，输入合法的中文姓名哦");
            }
            return strResult;
        }

        private bool testPhonnumber(string strUsername) //检测手机号的方法
        {
            bool strResult;// 判断结果的接收
            Regex exStrUserName = new Regex(@"^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$");
            //正则表达式的书写
            if (strResult = exStrUserName.Match(strUsername).Success)
            {
                phonnumber_test.Text = "?";
            }
            else
            {
                phonnumber_test.Text = "?";
                MessageBox.Show("请输入正确的手机号码");

            }
            return strResult;
        }

        private void nan_rb_CheckedChanged(object sender, EventArgs e)  //选择性别的事件
        {
            sexValue = nan_rb.Text;
        }
        private void nv_rb_CheckedChanged(object sender, EventArgs e)
        {
            sexValue = nv_rb.Text;
        }
        

        private void zhuce_bt_Click(object sender, EventArgs e)  //注册的点击事件
        {
            db.dbcon();
            try
            {
                string insertInfo = "insert register  values(‘" + username_text.Text + "‘,‘" + password_text.Text+ "‘,‘" + name_text.Text+
                     "‘,‘" + sexValue + "‘,‘" + phonnumber_text.Text + "‘)";
                db.dbInsert(insertInfo);
              DialogResult dr=MessageBox.Show("恭喜你注册成功,是否转到登录界面","注册成功对话框",MessageBoxButtons.OKCancel,MessageBoxIcon.Information);
              if (dr == DialogResult.OK)
              {
                  this.Close();
                  denglu fra = new denglu();
                  fra.ShowDialog();
                 
              }
              else if (dr == DialogResult.Cancel)
              {
                  this.Close();
              }

            }
            catch (Exception)
            {
                MessageBox.Show("不好意思，信息有误，注册失败");
            }
        }

        private void username_text_Leave(object sender, EventArgs e) //用户名文本框的光标事件
        {
            if (username_text.Text == "")
            {
                MessageBox.Show("用户名不能为空");
            }
            else
            {
                testuserName(username_text.Text);
            }
        }

        private void password_text_Leave(object sender, EventArgs e)//密码文本框的光标事件
        {
            if (password_text.Text == "")
            {
                MessageBox.Show("密码不能为空");
            }
            else
            {
                testPassWord(password_text.Text);
            }
        }

        private void name_text_Leave(object sender, EventArgs e)//姓名文本框的光标事件
        {
            if (name_text.Text == "")
            {
                MessageBox.Show("姓名不能为空");
            }
            else
            {
                testName(name_text.Text);
            }
        }

        private void phonnumber_text_Leave(object sender, EventArgs e)//手机号文本框的光标事件
        {
            if (phonnumber_text.Text == "")
            {
                MessageBox.Show("手机号不能为空");
            }
            else
            {
                testPhonnumber(phonnumber_text.Text);
            }
        }

        private void chongzhi_bt_Click(object sender, EventArgs e) //重置按钮
        {
            username_text.Text = "";
            phonnumber_text.Text = "";
            name_text.Text = "";
            phonnumber_text.Text = "";
        }

        private void quxiao_bt_Click(object sender, EventArgs e)// 取消事件
        {
            this.Close();
        }

        private void zhuce_Load(object sender, EventArgs e)
        {

        }
       
    }
}