Solved

VB.NET Dataset doesn't seem to update actual data source

Posted on 2003-11-21
8
403 Views
Last Modified: 2007-12-19
I have the following code:

objAdapter.Fill(objDataSet)
...
objDataSet.Tables("Table").Rows(Row).BeginEdit()
objDataSet.Tables("Table").Rows(Row).Item("TimeAccumulator") = objDataSet.Tables("Table").Rows(Row).Item("TimeAccumulator") + PingRate
objDataSet.Tables("Table").Rows(Row).EndEdit()
...
objDataSet.AcceptChanges
Dim oCB As OleDbCommandBuilder = New OleDbCommandBuilder(objAdapter)
objAdapter.Update(dsModified)

which runs without any errors, but the data source (i have tried both MS Access 2002 and SQL 2000) does not get updated.

I know that the dataset has my changes in it because I have called the objDataSet.GetXML method and written the XML to the event log and I can see my changes.

What am I missing?

0
Comment
Question by:bradmq
  • 3
  • 2
8 Comments
 
LVL 2

Expert Comment

by:MattWare
ID: 9798684
Where does dsModified come from?  You seem to have updated the objDataSet object - not dsModified.  objDataSet.GetXML shows your changes, but do you see them in dsModified.GetXML since that is what you are passing to the update call?

--M
0
 

Author Comment

by:bradmq
ID: 9799025
Whoops,

I posted code between edits.  The line should actually read

objAdapter.Update(objDataSet)

I had had some code previously that looked like this:

Dim dsModified As New DataSet()
dsModified = objDataSet.GetChanges

then I was calling

objAdapter.Update(dsModified)

This didn't work either so I had simplified it to just passing the dataset to the Update method.

Brad

0
 
LVL 2

Expert Comment

by:MattWare
ID: 9799654
Those are supposed to be parens and not brackets...
0
Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

 
LVL 2

Expert Comment

by:MattWare
ID: 9799658
Ignore that post please...wrong window.
0
 

Author Comment

by:bradmq
ID: 9799740
I figured out the problem:

The Update method on the adapter has to be called before the Acceptchanges method on the dataset!

Seems stupid and counter intuitive but I guess if I needed to rollback, I could call dataset.rejectchanges and call the adapter.update method again.
0
 

Accepted Solution

by:
PashaMod earned 0 total points
ID: 11024063
PAQed, with points refunded (125)

PashaMod
Community Support Moderator
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
This is about my first experience with programming Arduino.
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now