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VB Databases Basics Beginning-level VB coding questions specific to using VB with databases. Issues not specific to database use will be redirected to other forums.
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Old January 5th, 2008, 10:33 PM
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Default concurrency violation updating child table

Hey everyone,

I have 3 tables in an Access database - tblMain, tblDelivery, and tblOtherCosts. tblMain is the parent table with a primary key (ID) and tblDelivery and tblOtherCosts are detail tables with foreign keys (ID) in a one to many relationship with tblMain. Update and delete events are set to cascade (via Dataset Designer in VB 2008).

I display data from all three tables on a form: I have a DataGridView bound to tblMain. tblDelivery and tblOtherCosts have their respective textboxes (bound to the appropriate fields) on the form. tblMain also has a DataNavigator on the form.

I fill the dataset with:

Me.TblOtherCostsTableAdapter.Fill(Me.SpDataSet.tbl OtherCosts)
          Me.TblDeliveryTableAdapter.Fill(Me.SpDataSet.tblDe livery)
          Me.TblMainTableAdapter.Fill(Me.SpDataSet.tblMain)


To save changes to the database, I use the following:

Private Sub TblMainBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TblMainBindingNavigatorSaveItem.Click
        Me.Validate()
        Me.TblMainBindingSource.EndEdit()
        Me.TblDeliveryBindingSource.EndEdit()
        Me.TblOtherCostsBindingSource.EndEdit()
        Me.TableAdapterManager.UpdateAll(Me.SpDataSet)

End Sub

If I edit a value in the databound text box for tblDelivery or tblOtherCosts and try to save it (update) I get "Concurrency violation: the UpdateCommand affected 0 of the expected 1 records". Does anyone know why this is, and how I should modify my code to fix it?
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Old January 27th, 2008, 02:29 AM
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Default

I don't know if this helps but it did give me better understanding of updating related tables:

It is a 13 minutes video Presented by Beth Massi (Microsoft) on the subject.

http://download.microsoft.com/downlo...DataVS2008.wmv

- Tsadok

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