代码如下：
public static string constr = "Data Source=FUSHUAI;Initial Catalog=product;Integrated Security=True";
public static SqlConnection con = new SqlConnection(constr);
private void Form1_Load(object sender, EventArgs e)
{
gettable();
}
//执行查询操作
public static DataTable query(string sql)
{
SqlDataAdapter sda = new SqlDataAdapter(sql, constr);
DataTable dtable = new DataTable();
sda.Fill(dtable);
return dtable;
}
//执行更新操作
public static string update(string sql)
{
try
{
SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=数据表;Integrated Security=True"); // 打开数据库连接
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
int result = cmd.ExecuteNonQuery();
conn.Close();
return "success";
}
catch (Exception e)
{
MessageBox.Show(e.Message);
return e.ToString();
}
}
// 添加按钮
private void button1_Click(object sender, EventArgs e)
{
string id = textBox1.Text.Trim(); // 学号
string name = textBox2.Text.Trim();// 名称
string gender = comboBox1.Text.Trim();// 性别
string age = textBox3.Text.Trim();// 年龄
string intosql = $"insert into Students values('{id}','{name}','{gender}','{age}')";
update(intosql);
MessageBox.Show("添加成功");
gettable();
}
public void gettable()
{
string sql = "select * from students";
dataGridView1.DataSource = query(sql);
}
// 删除按钮
private void button2_Click(object sender, EventArgs e)
{
string id = dataGridView1.SelectedRows0.Cells0.Value.ToString(); // 学号
string intosql = $"delete from Students where Studentid='{id}'";
update(intosql);
MessageBox.Show("删除成功");
gettable();
}