Question

Can I see which tables have changed in the DataSet?

Asked by: Freerider

Hi all,

using HasChanges, I can see whether changes have been made to the dataset or not.
If changes have been made, is there any way I can see which table(s) the changes are in?

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Asked On
2007-12-28 at 14:13:07ID23048219
Tags

MS

,

Visual Studio

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2008

,

VB.NET

Topics

Visual Studio

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Microsoft Visual Basic.Net

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Answers

 

by: MrClyfarPosted on 2007-12-28 at 14:36:05ID: 20545766

Hi there.

Check out the GetChanges method of the DataSet class. Check out the sample code I've posted as an example. Here are also a couple of links to articles that might help you:

http://authors.aspalliance.com/aspxtreme/sys/data/DataSetClassHasChanges.aspx
http://www.dotnet247.com/247reference/msgs/57/285997.aspx
http://dotnetjunkies.com/WebLog/chrisfalter/archive/2006/02/28/135648.aspx

Hope this helps.
Jas.

Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        Dim ds As DataSet = CreateDataSet()
 
        AddRecordsToTableOne(ds)
 
        AddRecordsToTableTwo(ds)
 
        MakeChangesToTableOne(ds)
 
        If ds.HasChanges Then
            Dim dsChanges As DataSet = ds.GetChanges()
 
        End If
    End Sub
 
    Public Function CreateDataSet() As DataSet
        Dim ds As New DataSet
 
        Dim dt As New DataTable
        dt.TableName = "TableOne"
        dt.Columns.Add("Column1", GetType(String))
        dt.Columns.Add("Column2", GetType(Integer))
 
        ds.Tables.Add(dt)
 
        dt = New DataTable
        dt.TableName = "TableTwo"
        dt.Columns.Add("Column1", GetType(String))
        dt.Columns.Add("Column2", GetType(Integer))
 
        ds.Tables.Add(dt)
 
        Return ds
    End Function
 
    Public Sub AddRecordsToTableOne(ByVal ds As DataSet)
        Dim row As DataRow = ds.Tables("TableOne").Rows.Add
 
        row.Item("Column1") = "Testing 1234"
        row.Item("Column2") = 4567
        row.AcceptChanges()
 
    End Sub
 
    Public Sub AddRecordsToTableTwo(ByVal ds As DataSet)
        Dim row As DataRow = ds.Tables("TableTwo").Rows.Add
 
        row.Item("Column1") = "Welcome"
        row.Item("Column2") = 111111
        row.AcceptChanges()
 
    End Sub
 
    Public Sub MakeChangesToTableOne(ByVal ds As DataSet)
 
        Dim row As DataRow = ds.Tables("TableOne").Rows(0)
 
        row.Item("Column1") = "Changed"
 
    End Sub
End Class
                                              
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by: SanclerPosted on 2007-12-29 at 02:27:04ID: 20547380

To identify the tables in which the changes have occurred you'll need to take MrClyfar's code a bit further.  For instance, after line 14 you could insert

            For Each dt As DataTable In dsChanges.Tables
                If dt.Rows.Count > 0 Then
                    Debug.WriteLine(dt.TableName & " changed")
                Else
                    Debug.WriteLine(dt.TableName & " unchanged")
                End If
            Next

Roger

 

by: ptakjaPosted on 2007-12-29 at 14:01:15ID: 20549197

One comment about Sancler's code is that I think that the dsChanges dataset would only contain the changes. Thus, if there is a table in the dataset, then it has changed in some way. Therefore, I don't think you would need to do the IF statement to see if the datatable has any rows...

Just a thought.

20120131-EE-VQP-002

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