我基础不好，根据所学的知识，书本的例题修改的，也不知道我理解的是否符合老师要求
运用C#将数据存入数据库、并且可以读取数据库里的数据，此项目我运用了封装。我运用了一个窗体将数据存读数据。
我首先创建了一个数据库，库名“数学题库” ，然后创建了一个表“tiku1”,
添加一个类Class1
class Class1
{
public string strCon = @"Data Source=.;Initial Catalog=数学题库;Integrated security=true";
public SqlConnection sqlcon = new SqlConnection();
public SqlDataAdapter sda = new SqlDataAdapter();
public DataSet ds = new DataSet();
public DataTable dt = new DataTable();
public SqlDataReader sdr;
public void suanshu()
{
try
{
sqlcon = new SqlConnection(strCon);
}
catch (Exception e)
{
MessageBox.Show("数据库连接不成功：" + e.ToString());
}
}
public void suanFill(string selstr)
{
dt.Clear();
sda = new SqlDataAdapter(selstr, strCon);
sda.Fill(ds,"tiku1");
dt = ds.Tables["tiku1"];
}
public void suanselect(string showtnfo)
{
sqlcon.Open();
SqlCommand sqlcmd = new SqlCommand(showtnfo, sqlcon);
sdr = sqlcmd.ExecuteReader();
}
public void suanInsert(string insertinfo)
{
sqlcon.Open();
SqlCommand sqlcmd = new SqlCommand(insertinfo, sqlcon);
try
{
sqlcmd.ExecuteNonQuery();
}
catch (Exception e)
{
MessageBox.Show("数据插入失败：" + e.ToString());
}
sqlcon.Close();
}
public void suanGridViewUpd()
{
SqlCommandBuilder scb = new SqlCommandBuilder(sda);
DialogResult result;
result = MessageBox.Show("确定保存修改过的数据吗？", "操作提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
if (result == DialogResult.OK)
{
dt = ds.Tables["tuku1"];
sda.Update(dt);
dt.AcceptChanges();
}
}
public void suanDelete(string delStr)
{
sqlcon.Open();
SqlCommand sqlcmd = new SqlCommand(delStr, sqlcon);
try
{
sqlcmd.ExecuteNonQuery();
MessageBox.Show("数据删除成功！");
}
catch (Exception ex)
{
MessageBox.Show("数据删除失败" + ex.ToString());
}
sqlcon.Close();
}
}
}
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
string selstr = @"select * from tiku1 ";
Class1 db = new Class1();
private void Form1_Load(object sender, EventArgs e)
{
db.suanshu();
db.suanFill(selstr);
comboBox1.ValueMember = "序号";
comboBox1.DataSource = db.dt.DefaultView;
}
private void button4_Click(object sender, EventArgs e)
{
db.suanshu();
db.suanFill(selstr);
dataGridView1.DataSource = db.dt;
}
private void button1_Click(object sender, EventArgs e)
{
db.suanshu();
string insertinfo = "insert into tiku1(序号,第一个数,符号一,第二个数,符号二,第三个数,符号三,结果) values(‘" + comboBox1.Text + "‘,‘" + textBox1.Text +
"‘,‘" + textBox2.Text +
"‘,‘" + textBox3.Text + "‘,‘" + textBox4.Text + "‘,‘" + textBox5.Text + "‘,‘" + textBox6.Text +
"‘,‘" + textBox7.Text +
"‘)";
db.suanInsert(insertinfo);
db.suanFill(selstr);
dataGridView1.DataSource = db.dt;
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
string selinfo = "select 第一个数,符号一,第二个数,符号二,第三个数,符号三,结果 from tiku1 where 序号=‘" + comboBox1.Text.ToString().Trim() + "‘";
db.suanshu();
db.suanselect(selinfo);
while (db.sdr.Read())
{
textBox1.Text = db.sdr["第一个数"].ToString();
textBox2.Text = db.sdr["符号一"].ToString();
textBox3.Text = db.sdr["第二个数"].ToString();
textBox4.Text = db.sdr["符号二"].ToString();
textBox5.Text = db.sdr["第三个数"].ToString();
textBox6.Text = db.sdr["符号三"].ToString();
textBox7.Text = db.sdr["结果"].ToString();
}
db.sdr.Close();
}
private void button3_Click(object sender, EventArgs e)
{
db.suanshu();
string strupd = "delete from tiku1 where 序号=‘" + comboBox1.Text.Trim() + "‘";
db.suanDelete(strupd);
db.suanFill(selstr);
dataGridView1.DataSource = db.dt;
}
private void button2_Click(object sender, EventArgs e)
{
db.suanshu();
db.suanGridViewUpd();
}
}
}
说明
每道题我都编辑了序号，可以根据序号选题，改题，（序号我设置了下拉列表）
1、点击查询可以查询数据库里表里数据
2、点击添加可以添加数据
3、删除数据，更新数据