四则运算《《《《SQL出题

设计思路：

这次要用数据库存储题目，我想到的是用SQL server数据库,用dataGridView控件读取数据。

具体实现：

DBCon.cs

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Data;
 6 using System.Data.SqlClient;
 7 using System.Windows.Forms;
 8 namespace Dataopear
 9 {
10     class DBCon
11     {
12
13         public string strCon = @"Data Source=.;Initial Catalog=aritemtic;Integrated Security=True";  //连接数据库
14         public SqlConnection sqlCon = new SqlConnection();
15         public SqlDataAdapter sda = new SqlDataAdapter();
16         public DataSet ds = new DataSet();
17         public DataTable dt = new DataTable(); //数据源
18         public SqlDataReader sdr; //数据阅读器
19         public void dbcon()
20         {
21             try
22             {
23                 sqlCon = new SqlConnection(strCon);
24             }
25             catch (Exception e)
26             {
27                 MessageBox.Show("数据库连接不成功：" + e.ToString());
28             }
29         }
30         public void dbFill(string selstr)
31         {
32             dt.Clear();  //清空
33             sda = new SqlDataAdapter(selstr, strCon);//填充数据集
34             sda.Fill(ds, "opear");
35             dt = ds.Tables["opear"];
36         }
37         public void dbSelect(string showInfo)  //查询的方法
38         {
39
40             sqlCon.Open();
41             SqlCommand sqlcmd = new SqlCommand(showInfo, sqlCon);
42             sdr = sqlcmd.ExecuteReader();
43
44         }
45         public void dbInsert(string insertInfo)  //插入的方法
46         {
47             sqlCon.Open();
48             SqlCommand sqlcmd = new SqlCommand(insertInfo, sqlCon);
49             try
50             {
51                 sqlcmd.ExecuteNonQuery();
52             }
53             catch (Exception e)
54             {
55                 MessageBox.Show("数据插入失败" + e.ToString());
56             }
57             sqlCon.Close();
58         }
59
60         public void dbUpdate(string updStr)  //修改的方法
61         {
62             sqlCon.Open();
63             SqlCommand sqlcmd = new SqlCommand(updStr, sqlCon);
64             try
65             {
66                 sqlcmd.ExecuteNonQuery();
67                 MessageBox.Show("数据修改成功！");
68             }
69             catch (Exception e)
70             {
71                 MessageBox.Show("数据库修改失败" + e.ToString());
72             }
73             sqlCon.Close();
74         }
75         public void dbDelete(string delStr)  //删除的方法
76         {
77             sqlCon.Open();
78             SqlCommand sqlcmd = new SqlCommand(delStr, sqlCon);
79             try
80             {
81                 sqlcmd.ExecuteNonQuery();
82                MessageBox.Show("数据删除成功!");
83             }
84             catch (Exception e)
85             {
86                 MessageBox.Show("数据删除失败" + e.ToString());
87             }
88             sqlCon.Close();
89         }
90     }
91
92
93         }
94
95     

策略模式 arctor.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

 namespace Dataopear
 {
     class arictor
     {
          public interface Calculator        //声明计算接口
         {
             double Cal(double x, double y);
         }
         private double x;                //定义x变量；

         public double X                  //封装字段
         {
             get { return x; }
             set { x = value; }

         }
         private double y;               //定义y变量

         public double Y                  //封装字段
         {
             get { return y; }
             set { y = value; }

         }
         public class Add : Calculator            //接口法运算
         {
             public double Cal(double x, double y)
             {
                 double result = ;
                 result = x + y;
                 return result;
             }
         }
         public class Sub : Calculator
         {
             public double Cal(double x, double y)
             {
                 double result = ;
                 result = x - y;
                 return result;
             }
         }
         public class Mul : Calculator
         {
             public double Cal(double x, double y)
             {
                 double result = ;
                 result = x * y;
                 return result;
             }
         }
         public class Div : Calculator
         {
             public double Cal(double x, double y)
             {
                 double result = ;
                 result = x/ y;
                 return result;
             }
         }
         public class Opear                  //定义运算符
         {
             private Calculator calculate;
             public Opear(Calculator calculate)
             {
                 this.calculate = calculate;
             }
             public double Cal(double x, double y, String op)  //返回运算结果
             {
                 return this.calculate.Cal(x, y);
             }
         }
     }
 }
     

Form1.cs

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 using System.Data.SqlClient;
 namespace Dataopear
 {
     public partial class Form1 : Form
     {

         public Form1()
         {
             InitializeComponent();
         }
         public static int Count = ;               //计算所做的题数
         public static int Right = ;               //回答正确的题数
         string seltStr = @"select numberID,number1,symbol,number2 from opear";
         DBCon db = new DBCon();

         private void Form1_Load(object sender, EventArgs e)  //窗体加载
         {
             db.dbcon();
             db.dbFill(seltStr);
             comboBox1.ValueMember = "numberID";
             comboBox1.DataSource = db.dt;

         }

         private void dbSelect_Click(object sender, EventArgs e) //调用查询的方法
         {

             db.dbcon();
             db.dbFill(seltStr);
             dataGridView1.DataSource = db.dt;

         }

         private void dbAdd_Click(object sender, EventArgs e) //调用插入的方法
         {
             db.dbcon();
             string insertInfo = "insert into opear(numberID,number1,symbol,number2)values('" + comboBox1.Text + "','" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "')";
             db.dbInsert(insertInfo);
             db.dbFill(seltStr);
             dataGridView1.DataSource = db.dt;
             MessageBox.Show("增加试题成功！");
         }

         private void dbUpdate_Click(object sender, EventArgs e) //调用修改的方法
         {
             db.dbcon();
             string strUpd = "update opear set number1='" + textBox1.Text.Trim() + "',symbol='" + textBox2.Text.Trim() + "',number2='" +
                 textBox3.Text.Trim() + "' where numberID='" + comboBox1.Text.Trim() + "'";
             db.dbUpdate(strUpd);
             db.dbFill(seltStr);
             dataGridView1.DataSource = db.dt;
             MessageBox.Show("修改成功！");

         }

         private void dbDelete_Click(object sender, EventArgs e) //调用删除的方法
         {
             db.dbcon();
             string strsUpd = "delete from opear where numberID='" + comboBox1.Text.Trim() + "'";
             db.dbDelete(strsUpd);
             db.dbFill(seltStr);
             dataGridView1.DataSource = db.dt;

         }

         private void dbClose_Click(object sender, EventArgs e) //关闭程序
         {
             Application.Exit();
         }

         private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)   //numberID的事件
         {
             string selinfo = "select numberID,number1,symbol,number2 from opear where numberID='" + comboBox1.Text.ToString().Trim() + "'";
             db.dbcon();
             db.dbSelect(selinfo);
             if (db.sdr.Read())
             {
                 textBox1.Text = db.sdr["number1"].ToString();
                 textBox2.Text = db.sdr["symbol"].ToString();
                 textBox3.Text = db.sdr["number2"].ToString();
             }
         }
         private void textBox4_KeyDown(object sender, KeyEventArgs e)
         {
             arictor.Opear opear = null;
             double x = Convert.ToDouble(textBox1.Text); //为相关的变量赋值
             double y = Convert.ToDouble(textBox3.Text);
             string op = textBox2.Text;
             switch (op)
             {
                 case "+":
                     opear = new arictor.Opear(new arictor.Add()); //策略模式的引用
                     break;
                 case "-":
                     opear = new arictor.Opear(new arictor.Sub());

                     break;
                 case "*":
                     opear = new arictor.Opear(new arictor.Mul());

                     break;
                 case "÷":
                     opear = new arictor.Opear(new arictor.Div());

                     break;
                 default:
                     break;
             }

             if (e.KeyCode == Keys.Enter)
             {
                 string answer = opear.Cal(x, y, op).ToString();
                 if (textBox4.Text == answer.ToString())
                 {
                     MessageBox.Show("回答正确");
                     Count++;
                     Right++;
                     textBox1.Clear();
                     textBox2.Clear();
                     textBox3.Clear();
                     textBox4.Clear();

                 }
                 else
                 {
                     MessageBox.Show("回答错误");
                     Count++;
                     textBox1.Clear();
                     textBox2.Clear();
                     textBox3.Clear();
                     textBox4.Clear();
                 }
             }
         }

         private void end_Click(object sender, EventArgs e)
         {
             Form2 frm2 = new Form2();
             frm2.ShowDialog();
         }

     }
 }
     

Form2.cs

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

 namespace Dataopear
 {
     public partial class Form2 : Form
     {
         public Form2()
         {
             InitializeComponent();
         }

         private void Form2_Load(object sender, EventArgs e)
         {
             textBox1.Text = Form1.Count.ToString();
             textBox2.Text = Form1.Right.ToString();
             textBox3.Text = ((Form1.Right / (double)(Form1.Count)) * ).ToString() + "%";
         }

     }
 }

原始数据：

导入数据：

修改试题：

增加试题：

删除试题：

答题：

结束运算：

总结：

这次作业比之前的作业复杂一点，工厂模式暂时还没有弄清楚，所以用的策略模式实现的运算。