Hello,
I would appreciate any help in finding why I get an error when saving back
to a database.
I am using vb.net in VS-2019 with sqlite.
The error is: "Concurrency violation: the UpdateCommand affected 0 of the
expected 1 records."
I have worked out that the error only occurs when my table has a date field
which I fill from the underlying database use a sqlitedatadapter as follows:
Public connstring As String = "Data
Source=c:\VS-2019\SaveTable\SaveTable\Data\TestDb.db"
Public conn As New SQLiteConnection
Public Sub FillMainTables()
conn.ConnectionString = connstring
conn.Open()
DTAllCustomers.Rows.Clear()
sql = "SELECT * FROM Customers"
AllCustomersAdapter = New SQLiteDataAdapter(sql, conn)
AllCustomersAdapter.Fill(DTAllCustomers)
End Sub
I then modify a few records in the datatable(DTAllCustomers) using this
code:
For i = 0 To DTAllCustomers.Rows.Count - 1
If DTAllCustomers.Rows(i).Item("sitecode") = "RESI" Then
DTAllCustomers.Rows(i).Item("Email") = "Changed"
End If
Next
I then try to save the modified table back to the underlying database with:
Dim cbAllCustomers As New SQLiteCommandBuilder(AllCustomersAdapter)
AllCustomersAdapter.UpdateCommand = cbAllCustomers.GetUpdateCommand
Try
AllCustomersAdapter.Update(DTAllCustomers)
Catch ex As Exception
MsgBox(ex.Message)
End Try
When I remove the DATETIME columns in DTAllCustomers the error disappears
and the update completes correctly. Does SQLite change the date
structure/value of the DateTime columns between filling the datatable and
saving back to the datatable?
I created the database using "sqlite expert personal". When I loop through
the DTAllCustomers table I inspect the value of a date field and it appears
as - #2/12/2020 12:00:00 AM#
Any help is greatly appreciated as I have spent weeks trying to solve this
through any number of forums.
Brad
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