UPDATE Query不更新Access数据库中的记录

Question

任何人都可以查看我的代码并告诉我有什么问题吗？我正在尝试更新值，但Access数据库没有更新，即使我的方法正在解析查询。

protected void Page_Load(object sender, EventArgs e)
{
    if ((string)Session["sFlag"] != "LI")
    {
        Response.Redirect("Default.aspx");
    }
    else
    {
        strUserId = (string)Session["sUserId"];
        txtUserId.Text = strUserId;
        txtName.Text = (string)Session["sName"];
        txtAddress.Text = (string)Session["sAddress"];
        txtEmail.Text = (string)Session["sEmail"];
        txtTel.Text = (string)Session["sContactNo"];


    }
}
protected void btnSubmit_Click(object sender, EventArgs e)
{

    strUserId = (string)Session["sUserId"];
    if (txtName.Text != "")
    {
        String strFName = "cFullName";
        String strFValue = txtName.Text;
        UpdateCustomer(strFName, strFValue);
        Session["sName"] = txtName.Text;
    }
    if (UFlag == "T")
    {
        Type strType = this.GetType();
        ClientScript.RegisterStartupScript(strType, "Success", scriptSuccessUpdate);
    }


}

public void UpdateCustomer(string strFName, string strFValue)
{
    OleDbConnection mDB = new OleDbConnection();
    mDB.ConnectionString = "Provider = Microsoft.ACE.OLEDB.12.0;Data source="
         + Server.MapPath("~/App_Data/WMA_Proj.accdb");
    mDB.Open();
    OleDbCommand cmd;
    String strSQL = "UPDATE Customers  SET " + strFName +
        " = @newValue WHERE cUserId = @userId";
    cmd = new OleDbCommand(strSQL, mDB);
    cmd.Parameters.Add("@newValue", OleDbType.Char).Value = strFValue;
    cmd.Parameters.Add("@userId", OleDbType.Char).Value = strUserId;
    cmd.ExecuteNonQuery();
    UFlag = "T";
    mDB.Close();

}

}

这也是我的Access数据库表（图像）。

Access Database Table

Answer 1

试试这个

 public void UpdateCustomer(string strFName, string strFValue)
    {
        OleDbConnection mDB = new OleDbConnection();
        mDB.ConnectionString = "Provider = Microsoft.ACE.OLEDB.12.0;Data source="
             + Server.MapPath("~/App_Data/WMA_Proj.accdb");
        mDB.Open();
        OleDbCommand cmd;
        String strSQL = "UPDATE Customers  SET cFullname= @newValue WHERE cUserId = @userId";
        cmd = new OleDbCommand(strSQL, mDB);
        cmd.Parameters.AddWithValue("@newValue", strFName);
        cmd.Parameters.AddWithValue("@userId",strFvalue);
        cmd.ExecuteNonQuery();
        UFlag = "T";
        mDB.Close();

    }