Solved

Deleting Rows from a Database in VB2005

Posted on 2006-07-04
1
236 Views
Last Modified: 2010-04-23
I am having trouble permanently deleting records from a database using VB2005.  The dataset, tableadapter, and binder are defined. I can successfully add records to the source database (permanently), but cant delete them.  

Any idea why the following doesnt work?

MyTableTableAdapter.Fill(MyDataset.MyTable)
MyDataset.MyTable.rows.clear    
MyDataset.myTableAdapter.Update(MyDataset.MyTable)

The deletions occur in the temorary dataset created by VB, but not in the source database.

0
Comment
Question by:BW999
1 Comment
 
LVL 34

Accepted Solution

by:
Sancler earned 250 total points
ID: 17038503
A DataAdapter (hence a TableAdapter) works, when .Update is called, by looking that the .RowState flags of the rows in the relevant datatable.  If any of those are set to "Deleted" then it will send the appropriate "Delete" command to the database.  What you are doing with

MyDataset.MyTable.rows.clear    

is REMOVING all the rows that you have just filled with the .Fill command.  So when you call .Update, there are no rows, hence no .Rowstate flags, hence nothing done.

If you want to mark all rows for deletion then you need something like

MyTableTableAdapter.Fill(MyDataset.MyTable)
For Each dr As DataRow in MyDataSet.MyTable.Rows
    dr.Delete
Next
MyDataset.myTableAdapter.Update(MyDataset.MyTable)

Roger
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
vb.net winforms sizing/resolution? 4 56
Complex SQL statement in VB.NET 7 40
ASP.NET (VB) return a record 2 52
CHANGE FORM TEXT BEFORE IT SHOW TO USER 13 19
A while ago, I was working on a Windows Forms application and I needed a special label control with reflection (glass) effect to show some titles in a stylish way. I've always enjoyed working with graphics, but it's never too clever to re-invent …
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

733 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