ASP.NET:无法更新从数据库中读取的值

本文关键字:数据库 读取 更新 NET ASP | 更新日期: 2023-09-27 18:36:32

我想编辑从数据库中读取的值。我的读取代码是:(这在我的page_load中找到)

string uname = Session["ApplicantUsername1"].ToString();
txtUsername.Text = uname;
cs.Open();
SqlCommand cmd = new SqlCommand("SELECT  NoALastName, NoAFirstName, NoAMiddleName FROM CustomerCreditReport WHERE ApplicantUsername = '" + uname + "'", cs);
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
    txtLname.Text = reader["NoALastName"].ToString();
    txtFname.Text = reader["NoAFirstName"].ToString();
    txtMname.Text = reader["NoAMiddleName"].ToString();
}
cs.Close();
reader.Close();

现在,这是我的保存/更新代码。(这是在Save_Click下)

SqlDataAdapter da = new SqlDataAdapter();
da.UpdateCommand = new SqlCommand("UPDATE CustomerCreditReport SET NoALastName = @NoALastName, NoAFirstName = @NoAFirstName, NoAMiddleName = @NoAMiddleName WHERE ApplicantUsername = '" + txtUsername.Text + "'", cs);
da.UpdateCommand.Parameters.Add("@NoALastName", SqlDbType.VarChar).Value = txtLname.Text;
da.UpdateCommand.Parameters.Add("@NoAFirstName", SqlDbType.VarChar).Value = txtFname.Text;
da.UpdateCommand.Parameters.Add("@NoAMiddleName", SqlDbType.VarChar).Value = txtMname.Text;
cs.Open();
da.UpdateCommand.ExecuteNonQuery();
cs.Close();

我想知道我是否忽略了什么。请帮忙。谢谢。

ASP.NET:无法更新从数据库中读取的值

在页面加载中,请确保将代码放在 if (!Page.IsPostBack)喜欢这个

 if (!Page.IsPostBack)
 {
  string uname = Session["ApplicantUsername1"].ToString();
        txtUsername.Text = uname;
        cs.Open();
        SqlCommand cmd = new SqlCommand("SELECT  NoALastName, NoAFirstName, NoAMiddleName FROM CustomerCreditReport WHERE   ApplicantUsername = '" + uname + "'", cs);
SqlDataReader reader = cmd.ExecuteReader();
        while (reader.Read())
        {
            txtLname.Text = reader["NoALastName"].ToString();
            txtFname.Text = reader["NoAFirstName"].ToString();
            txtMname.Text = reader["NoAMiddleName"].ToString();
        }
        cs.Close();
        reader.Close();
 }