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VB.NET 2002/2003 Basics For coders who are new to Visual Basic, working in .NET versions 2002 or 2003 (1.0 and 1.1).
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Old November 18th, 2003, 04:31 PM
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Default Dataset Question

Here's my code...

    Private oConn As New OleDb.OleDbConnection()
    Private oCommand As New OleDb.OleDbCommand()
    Private oDataAdapter As New OleDb.OleDbDataAdapter()
    Private oDataSet As New DataSet()

    Public Event Err()

    Public Sub Init()

        Dim Row As DataRow

        oConn.ConnectionString = _
            "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & _
            Application.StartupPath & _
            "\WinMUX.mdb;Persist Security Info=False"

        oCommand.CommandText = "SELECT Name FROM Objects"
        oCommand.Connection = oConn
        oCommand.CommandTimeout = 30
        oDataAdapter.SelectCommand = oCommand
        oDataAdapter.Fill(oDataSet, "Objects")

        For Each Row In oDataSet.Tables("Objects").Rows
            MsgBox(Row("Name"))
            If Row("Name") = "Brimstone" Then
                Row("Name") = "NotBrimstone"
            End If
        Next
        oDataAdapter.Update(oDataSet, "Objects")

    End Sub

I know it isn't the prettiest code but I'm just trying to figure this Data Access stuff out in .NET. How do I update the data in the database with what has been changed in the Dataset? I'm completely lost. With ADO you used to just call the adoRecordset.Update method. What do you do now?



Andrew Cooper
aecooper@earthlink.net
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Old November 19th, 2003, 12:00 PM
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Default

Each row in the data set has a version, which tracks the type of change made to the data set, so if it was added, updated, deleted, etc, that's how it tracks the changes. In looking at your code, it looks like you got the right idea, you call the DataAdapter's update statement to make the change to the dataset, and the parameters you passed in are right.

Are you having any specific problems?

Brian
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