Question

尝试更新学生的名字有一个文本框＆＃34; FirstNameTextbox＆＃34;信息从DB加载到它，当我更改文本框中的信息并尝试写入更改时，它只读取原始数据。如果它已加载＆＃34; Craig＆＃34;作为DB的第一个名字，我会编辑并放置＆＃34; Chris＆＃34;在文本框中，会发生什么是Craig写入数据库而不是＆＃34; Chris＆＃34;

int stuID = getSqlStuID(IDNUMLabel.Text);
SqlConnection conn = new SqlConnection(GetConnectionString());
string sqlUpdateStudent = "Update tblStudent set fname = @fname where stuID = @stuID";
SqlCommand cmd = new SqlCommand(sqlUpdateStudent, conn);

conn.Open();

cmd.Parameters.AddWithValue("@stuID", stuID);
cmd.Parameters.AddWithValue("@fname", FirstNameTextbox.Text);

cmd.ExecuteNonQuery();

ErrorMessage.Text = "Success";


protected void Page_Load(object sender, EventArgs e)
{
    if (Session["User"] != null)
    {
        IDNUMLabel.Text = Session["User"].ToString();
        getStuData(Session["User"].ToString());
    }
    else
    {
        Response.Redirect("../Login/Login.aspx");
    }
}

private void getStuData(string id)
{
    SqlConnection conn = new SqlConnection(GetConnectionString());

    string sql = "Select fname, sname From tblStudent Where idnumber = '" + id + "' ";

    SqlCommand cmd = new SqlCommand(sql, conn);

    try
    {
        conn.Open();

        SqlDataReader selectedRecord = cmd.ExecuteReader();

        cmd.CommandType = CommandType.Text;

        while (selectedRecord.Read())
        {
            FirstNameTextbox.Text = selectedRecord["fname"].ToString();
            LastNameTextbox.Text = selectedRecord["sname"].ToString();
        }

        selectedRecord.Close();
    }
    catch (System.Data.SqlClient.SqlException ex)
    {

        //id = 0;
        //string msg = "Error reading Student ID";
        //msg += ex.Message;
        //throw new Exception(msg);
    }
    catch (Exception ex)
    {

    }
    finally
    {
        conn.Close();
    }
}

Answer 1

您在什么时候进行实际更新？按下按钮后，在文本框中输入值...？您错过了处理更新的代码放置的方法... 也许这可能会有所帮助：How to display data from database into textbox, and update it

使用C＃中的更新文本框信息更新数据库

1 个答案: