1，首先定义一个数据库连接与操作的抽象类，这个里面写一些你需要用到的一些抽象方法。
然后就是对应你的数据库写与之对应的类并继承你说定义的抽象类，并重写抽象类里面的方法！
对应代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
namespace DBASES
{
public abstract class DBastr
{
abstract public int Insert(string number1,string operation, string number2);
abstract public int Delect();
abstract public DataTable Gettable();
abstract public void Open();
abstract public void Close();
}
public class TIASS : DBastr
{
public static string constr = "Data Source=.;Initial Catalog=TIASS;Integrated Security=True";
SqlConnection conn = new SqlConnection(constr);
public override void Open()
{
conn = new SqlConnection(constr);
conn.Open();
}
public override void Close()
{
conn.Close();
}
public override int Insert(string number1, string operation, string number2)
{
string cmdstr = "insert into TI(number1,operation,number2) values (‘"+number1+"‘,‘"+operation+"‘,‘"+number2+"‘)";
Open();
SqlCommand cmd = new SqlCommand(cmdstr, conn);
int a = cmd.ExecuteNonQuery();
Close();
return a;
}
public override int Delect()
{
string cmdstr = "delete from TI";
Open();
SqlCommand cmd = new SqlCommand(cmdstr, conn);
int a = cmd.ExecuteNonQuery();
Close();
return a;
}
public override DataTable Gettable()
{
string cmdstr = "select number1,operation, number2 from TI";
SqlDataAdapter dat = new SqlDataAdapter(cmdstr,conn);
DataTable dt = new DataTable();
dat.Fill(dt);
return dt;
}
}
public class TIBD : DBastr
{
public static string constr = "Data Source=.;Initial Catalog=TIBD;Integrated Security=True";
SqlConnection conn = new SqlConnection(constr);
public override void Open()
{
conn.Open();
}
public override void Close()
{
conn.Close();
}
public override int Insert(string number1, string operation, string number2)
{
string cmdstr = "insert into TA(number1,operation,number2) values (‘" + number1 + "‘,‘" + operation + "‘,‘" + number2 + "‘)";
Open();
SqlCommand cmd = new SqlCommand(cmdstr, conn);
int a = cmd.ExecuteNonQuery();
Close();
return a;
}
public override int Delect()
{
string cmdstr = "delete from TA";
Open();
SqlCommand cmd = new SqlCommand(cmdstr, conn);
int a = cmd.ExecuteNonQuery();
Close();
return a;
}
public override DataTable Gettable()
{
string cmdstr = "select number1,operation, number2 from TA";
SqlDataAdapter dat = new SqlDataAdapter(cmdstr, conn);
DataTable dt = new DataTable();
dat.Fill(dt);
return dt;
}
}
public class Faction //定义工厂类
{
public DBastr dbastr;
public DBastr GetDB(string DBtyle)
{
switch (DBtyle)
{
case "TIASS":
dbastr = new TIASS();
break;
case "TIDB":
dbastr = new TIBD();
break;
}
return dbastr;
}
}
}
然后定义计算所用的类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace DBASES
{
interface Iation//定义计算接口
{
double Calation(double a, double b);
}
class Add : Iation//加法
{
public double Calation(double a, double b)
{
return a + b;
}
}
class Sub : Iation//减法
{
public double Calation(double a, double b)
{
return a - b;
}
}
class Mul : Iation//乘法
{
public double Calation(double a, double b)
{
return a * b;
}
}
class Div : Iation//除法
{
public double Calation(double a, double b)
{
if (b == 0)
{
throw new Exception("除数不能为零！");
}
else
{
return a / b;
}
}
}
class Factionsss
{
private Iation clation;
public Factionsss(string operation)
{
switch (operation)
{
case "+":
clation = new Add();
break;
case "-":
clation = new Sub();
break;
case "*":
clation = new Mul();
break;
case "/":
clation = new Div();
break;
}
}
public double cal(double a, double b)
{
return clation.Calation(a, b);
}
}
}
from1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.Windows.Forms;
namespace DBASES
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Faction faction = new Faction();
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
if (radioButton1.Checked == true)
{
label2.Text = "你选择了TIASS数据库！";
}
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
if (radioButton2.Checked == true)
{
label2.Text = "你选择了TIDB数据库！";
}
}
private void button1_Click(object sender, EventArgs e)
{
if (radioButton1.Checked == true)
{
int a = faction.GetDB("TIASS").Insert(textBox1.Text, comboBox1.Text, textBox2.Text);
if (a > 0)
{
MessageBox.Show("保存成功！");
}
else
{
MessageBox.Show("保存失败!");
}
textBox1.Clear();
textBox2.Clear();
}
else if (radioButton2.Checked == false)
{
MessageBox.Show("请选择你所要链接的数据库！");
}
else
{
int b = faction.GetDB("TIDB").Insert(textBox1.Text, comboBox1.Text, textBox2.Text);
if (b > 0)
{
MessageBox.Show("保存成功！");
}
else
{
MessageBox.Show("保存失败！");
}
textBox1.Clear();
textBox2.Clear();
}
}
private void button2_Click(object sender, EventArgs e)
{
if (radioButton1.Checked == true)
{
int c = faction.GetDB("TIASS").Delect();
if (c > 0)
{
MessageBox.Show("删除成功！");
}
else
{
MessageBox.Show("删除失败！");
}
}
else if (radioButton2.Checked == true)
{
int d = faction.GetDB("TIDB").Delect();
if (d > 0)
{
MessageBox.Show("删除成功！");
}
else
{
MessageBox.Show("删除失败！");
}
}
else
{
MessageBox.Show("请选择你所要删除的数据！");
}
}
private void button3_Click(object sender, EventArgs e)
{
Form2 fra = new Form2();
fra.ShowDialog();
}
private void Form1_Load(object sender, EventArgs e)
{
radioButton1.Checked = true;
}
}
}
from1设计
from2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.Windows.Forms;
namespace DBASES
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private int i = 0;
Faction fation = new Faction();
private void Form2_Load(object sender, EventArgs e)
{
radioButton1.Checked = true;
i = 0;
Read("TIASS");
}
public void Read(string DB)
{
DataTable dt = fation.GetDB(DB).Gettable();
if (i <= dt.Rows.Count - 1)
{
textBox1.Text = dt.Rows[i][0].ToString().Trim();
label1.Text = dt.Rows[i][1].ToString().Trim();
textBox2.Text = dt.Rows[i][2].ToString().Trim();
i++;
}
else
{
MessageBox.Show("本数据库题你做完了！");
}
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
i = 0;
Read("TIDB");
}
private void textBox3_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
double a = Convert.ToDouble(textBox1.Text);
double b = Convert.ToDouble(textBox2.Text);
string oper = label1.Text;
Factionsss fas = new Factionsss(oper);
double answer = fas.cal(a, b);
if (textBox3.Text == answer.ToString())
{
MessageBox.Show("回答正确！");
}
else
{
MessageBox.Show("回答错误！");
}
textBox3.Clear();
if (radioButton1.Checked == true)
{
Read("TIASS");
}
else
{
Read("TIDB");
}
}
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
i = 0;
Read("TIASS");
}
}
}
from2设计
测试
TIASS数据库存题
TIDB数据库存题
TIASS数据库做题
TIDB数据库做题
多数据库的存题读题感觉很灵活，但是只能是表结构相同的情况下才能成功？
本来是想写一个可以两个数，三个数，四个数都可以选择的数据库存题读题。但是发现用这个方法无法实现！
时间： 2024-10-05 05:02:09