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Deleting Rows from a Database in VB2005

Posted on 2006-07-04
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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.

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Question by:BW999
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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
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