sql表数据更新失败

Question

I am trying to update users details if user want to edit his/her information on our system I use following code but I couldn't be able to do it. There is no error or exception occur, even I add watch and code smoothly execute.

public void updateprofile()
{

    SqlConnection MySQL = new SqlConnection(ConfigurationManager.ConnectionStrings["BloodDonorRegistrationConnectionString"].ToString());
    SqlCommand cmd = new SqlCommand("UPDATE Donor SET D_FirstName= @fn, D_LastName=@ln, D_Phone=@phn, D_City=@ct, D_Address=@add where D_Email='"+Session["UserID"]+"'", MySQL);
    cmd.CommandType = CommandType.Text;
    cmd.Parameters.AddWithValue("@fn", TextBoxFName.Text);
    cmd.Parameters.AddWithValue("@ln", TextBoxLName.Text);
    cmd.Parameters.AddWithValue("@phn", TextBoxCellNum.Text);
    cmd.Parameters.AddWithValue("@ct", DropDownListCity.SelectedItem.Text);
    cmd.Parameters.AddWithValue("@add", ButtonAddress.Text);
    MySQL.Open();
    cmd.ExecuteNonQuery();
    MySQL.Close();
    Response.Redirect("doDashboard.aspx");
}

Please guide and thanks in advance.

Answer 1

Session["UserID"]是一个对象，但是我认为您数据库中的D_Email列是varchar类型，因此请在where子句中使用Session["UserID"].ToString()尝试一下Session["UserID"].ToString()它将起作用。