MDB Database won't update

Greetings to anyone who can help:
I'm using WebMatrix to make ASP.NET pages, and I chose the "Editable
DataGrid" at the project selector screen. As you may know, it defaults
to the Microsoft SQL database "pubs". I've followed the instructions in
the comments and also changed everything pertaining to SQL over to
OLEDB. (i.e. Changed SqlDbType. to OleDbType.) I also changed the
datafield names and variable names accordingly. The page loads, the
datagrid displays, when I click "Edit" the row of data becomes TextBoxes
as they are supposed to. However, when I alter the data and click
"Update" the changes do not take. Since I am a newbie to ASP.NET (but I
did take 2 semesters of VB in college) I do not understand why this is
happening. I need some help on this one. I am attaching the ASPX file
for your review.
Thanx in advance,
JonathanHi.
You are creating a command but not inserting any data into it.
Create a DataAdapter
Set the Update command of that.
Call dataadapter.update()
"Jonathan Upright" <qaesar1@.carolina.rr.com> wrote in message
news:HiG0f.26325$ua.1055676@.twister.southeast.rr.com...
> Greetings to anyone who can help:
> I'm using WebMatrix to make ASP.NET pages, and I chose the "Editable
> DataGrid" at the project selector screen. As you may know, it defaults
> to the Microsoft SQL database "pubs". I've followed the instructions in
> the comments and also changed everything pertaining to SQL over to
> OLEDB. (i.e. Changed SqlDbType. to OleDbType.) I also changed the
> datafield names and variable names accordingly. The page loads, the
> datagrid displays, when I click "Edit" the row of data becomes TextBoxes
> as they are supposed to. However, when I alter the data and click
> "Update" the changes do not take. Since I am a newbie to ASP.NET (but I
> did take 2 semesters of VB in college) I do not understand why this is
> happening. I need some help on this one. I am attaching the ASPX file
> for your review.
> Thanx in advance,
> Jonathan
>
----
--

> <%@. Page Language="VB" %>
> <%@. import Namespace="System.Data" %>
> <%@. import Namespace="System.Data.OleDb" %>
> <script runat="server">
> ' TODO: update the ConnectionString and Command values for your
> application
> Dim ConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;data
> source=specialorders.mdb"
> Dim SelectCommand As String = "SELECT PurchaseOrderNumber, LastName,
> FirstName from [Purchase Orders]"
> Dim isEditing As Boolean = False
> Sub Page_Load(Sender As Object, E As EventArgs)
> If Not Page.IsPostBack Then
> ' Databind the data grid on the first request only
> ' (on postback, bind only in editing, paging and sorting
> commands)
> BindGrid()
> End If
> End Sub
> ' ---
> '
> ' DataGrid Commands: Page, Sort, Edit, Update, Cancel, Delete
> '
> Sub DataGrid_ItemCommand(Sender As Object, E As
> DataGridCommandEventArgs)
> ' this event fires prior to all of the other commands
> ' use it to provide a more graceful transition out of edit mode
> CheckIsEditing(e.CommandName)
> End Sub
> Sub CheckIsEditing(commandName As String)
> If DataGrid1.EditItemIndex <> -1 Then
> ' we are currently editing a row
> If commandName <> "Cancel" And commandName <> "Update" Then
> ' user's edit changes (If any) will not be committed
> Message.Text = "Your changes have not been saved yet.
> Please press update to save your changes, or cancel to discard your
> changes, before selecting another item."
> isEditing = True
> End If
> End If
> End Sub
> Sub DataGrid_Edit(Sender As Object, E As DataGridCommandEventArgs)
> ' turn on editing for the selected row
> If Not isEditing Then
> DataGrid1.EditItemIndex = e.Item.ItemIndex
> BindGrid()
> End If
> End Sub
> Sub DataGrid_Update(Sender As Object, E As DataGridCommandEventArgs)
> ' update the database with the new values
> ' get the edit text boxes
> Dim PurchaseOrderNumber As Long =
> CType(e.Item.Cells(2).Controls(0), TextBox).Text
> Dim LastName As String = CType(e.Item.Cells(3).Controls(0),
> TextBox).Text
> Dim FirstName As String = CType(e.Item.Cells(4).Controls(0),
> TextBox).Text
> ' TODO: update the Command value for your application
> Dim myConnection As New OleDbConnection(ConnectionString)
> Dim UpdateCommand As New OleDbCommand()
> UpdateCommand.Connection = myConnection
> If AddingNew = True Then
> UpdateCommand.CommandText = "INSERT INTO [Purchase
> Orders](PurchaseOrderNumber, LastName, FirstName) VALUES
> (@.PurchaseOrderNumber, @.LastName, @.FirstName)"
> Else
> UpdateCommand.CommandText = "UPDATE [Purchase Orders] SET
> LastName = @.LastName, FirstName = @.FirstName WHERE PurchaseOrderNumber =
> @.PurchaseOrderNumber"
> End If
> UpdateCommand.Parameters.Add("@.PurchaseOrderNumber",
> OleDbType.BigInt).Value = PurchaseOrderNumber
> UpdateCommand.Parameters.Add("@.LastName", OleDbType.VarChar,
> 15).Value = LastName
> UpdateCommand.Parameters.Add("@.FirstName", OleDbType.VarChar,
> 12).Value = FirstName
> ' execute the command
> Try
> myConnection.Open()
> UpdateCommand.ExecuteNonQuery()
> Catch ex as Exception
> Message.Text = ex.ToString()
> Finally
> myConnection.Close()
> End Try
> ' Resort the grid for new records
> If AddingNew = True Then
> DataGrid1.CurrentPageIndex = 0
> AddingNew = False
> End If
> ' rebind the grid
> DataGrid1.EditItemIndex = -1
> BindGrid()
> End Sub
> Sub DataGrid_Cancel(Sender As Object, E As DataGridCommandEventArgs)
> ' cancel editing
> DataGrid1.EditItemIndex = -1
> BindGrid()
> AddingNew = False
> End Sub
> Sub DataGrid_Delete(Sender As Object, E As DataGridCommandEventArgs)
> ' delete the selected row
> If Not isEditing Then
> ' the key value for this row is in the DataKeys collection
> Dim keyValue As Long =
> CLng(DataGrid1.DataKeys(e.Item.ItemIndex))
> ' TODO: update the Command value for your application
> Dim myConnection As New OleDbConnection(ConnectionString)
> Dim DeleteCommand As New OleDbCommand("DELETE from [Purchase
> Orders] where PurchaseOrderNumber='" & keyValue & "'", myConnection)
> ' execute the command
> myConnection.Open()
> DeleteCommand.ExecuteNonQuery()
> myConnection.Close()
> ' rebind the grid
> DataGrid1.CurrentPageIndex = 0
> DataGrid1.EditItemIndex = -1
> BindGrid()
> End If
> End Sub
> Sub DataGrid_Page(Sender As Object, E As DataGridPageChangedEventArgs)
> ' display a new page of data
> If Not isEditing Then
> DataGrid1.EditItemIndex = -1
> DataGrid1.CurrentPageIndex = e.NewPageIndex
> BindGrid()
> End If
> End Sub
> Sub AddNew_Click(Sender As Object, E As EventArgs)
> ' add a new row to the end of the data, and set editing mode 'on'
> CheckIsEditing("")
> If Not isEditing = True Then
> ' set the flag so we know to do an insert at Update time
> AddingNew = True
> ' add new row to the end of the dataset after binding
> ' first get the data
> Dim myConnection As New OleDbConnection(ConnectionString)
> Dim myCommand As New OleDbDataAdapter(SelectCommand,
> myConnection)
> Dim ds As New DataSet()
> myCommand.Fill(ds)
> ' add a new blank row to the end of the data
> Dim rowValues As Object() = {"", "", ""}
> ds.Tables(0).Rows.Add(rowValues)
> ' figure out the EditItemIndex, last record on last page
> Dim recordCount As Integer = ds.Tables(0).Rows.Count
> If recordCount > 1 Then
> recordCount -= 1
> DataGrid1.CurrentPageIndex = recordCount \
> DataGrid1.PageSize
> DataGrid1.EditItemIndex = recordCount Mod
> DataGrid1.PageSize
> End If
> ' databind
> DataGrid1.DataSource = ds
> DataGrid1.DataBind()
> End If
>
> End Sub
> ' ---
> '
> ' Helpers Methods:
> '
> ' property to keep track of whether we are adding a new record,
> ' and save it in viewstate between postbacks
> Property AddingNew() As Boolean
> Get
> Dim o As Object = ViewState("AddingNew")
> If o Is Nothing Then
> Return False
> End If
> Return CBool(o)
> End Get
> Set(ByVal Value As Boolean)
> ViewState("AddingNew") = Value
> End Set
> End Property
> Sub BindGrid()
> Dim myConnection As New OleDbConnection(ConnectionString)
> Dim myCommand As New OleDbDataAdapter(SelectCommand, myConnection)
> Dim ds As New DataSet()
> myCommand.Fill(ds)
> DataGrid1.DataSource = ds
> DataGrid1.DataBind()
> End Sub
> </script>
> <html>
> <head>
> </head>
> <body style="FONT-FAMILY: arial">
> <h2>Editable Data Grid
> </h2>
> <hr size="1" />
> <form runat="server">
> <asp:datagrid id="DataGrid1" runat="server"
> HorizontalAlign="Center" DataKeyField="PurchaseOrderNumber"
> OnItemCommand="DataGrid_ItemCommand" OnEditCommand="DataGrid_Edit"
> OnUpdateCommand="DataGrid_Update" OnCancelCommand="DataGrid_Cancel"
> OnDeleteCommand="DataGrid_Delete" AllowPaging="True" PageSize="6"
> OnPageIndexChanged="DataGrid_Page" ForeColor="Black" BackColor="White"
> CellPadding="3" CellSpacing="1" width="100%">
> <FooterStyle backcolor="#C6C3C6"></FooterStyle>
> <ItemStyle backcolor="#DEDFDE"></ItemStyle>
> <HeaderStyle font-bold="True" forecolor="White"
> backcolor="#4A3C8C"></HeaderStyle>
> <Columns>
> <asp:EditCommandColumn ButtonType="PushButton"
> UpdateText="Update" CancelText="Cancel" EditText="Edit">
> <ItemStyle font-size="Smaller" width="10%"></ItemStyle>
> </asp:EditCommandColumn>
> <asp:ButtonColumn Text="Delete" ButtonType="PushButton"
> CommandName="Delete">
> <ItemStyle font-size="Smaller" width="10%"></ItemStyle>
> </asp:ButtonColumn>
> </Columns>
> <PagerStyle font-size="Smaller" horizontalalign="Right"
> backcolor="#C6C3C6" mode="NumericPages"></PagerStyle>
> </asp:datagrid>
> <br />
> <asp:LinkButton id="LinkButton1" onclick="AddNew_Click"
> runat="server" Text="Add new item" Font-Size="smaller"></asp:LinkButton>
> <br />
> <br />
> <asp:Label id="Message" runat="server" width="80%"
> enableviewstate="false" forecolor="red"></asp:Label>
> </form>
> </body>
> </html>
>
Would I have to use the "regular" DataAdapter or OleDbDataAdapter?
Thanx,
Jonathan
Jon wrote:
> Hi.
> You are creating a command but not inserting any data into it.
> Create a DataAdapter
> Set the Update command of that.
> Call dataadapter.update()
> "Jonathan Upright" <qaesar1@.carolina.rr.com> wrote in message
> news:HiG0f.26325$ua.1055676@.twister.southeast.rr.com...
>
>
> ----
--
>
>
>
OleDataAdapter
"Jonathan Upright" <qaesar1@.carolina.rr.com> wrote in message
news:cqH0f.84425$SL.2174643@.twister.southeast.rr.com...
> Would I have to use the "regular" DataAdapter or OleDbDataAdapter?
> Thanx,
> Jonathan
> Jon wrote:
Just remember its neither OleDB or SQL DataAdapter
Patrick
"Jonathan Upright" <qaesar1@.carolina.rr.com> wrote in message
news:cqH0f.84425$SL.2174643@.twister.southeast.rr.com...
> Would I have to use the "regular" DataAdapter or OleDbDataAdapter?
> Thanx,
> Jonathan
> Jon wrote:
> ----
--
"Provider=Microsoft.Jet.OLEDB.4.0;data
DataGridPageChangedEventArgs)[color=dark
red]
myConnection)
width="10%"></ItemStyle>
width="10%"></ItemStyle>