Understanding the dataadapter.delete command
I'm new to ADO and ODP so forgive me if I'm missing the obvious. I want to do a simple delete from the database. The problem is I feel like I have to issue the delete command twice. The code I've posted blow works but I don't understand why. I create two commands one a select command the second a delete command. I apply these commands to a dataadapter and then use dataadapter .fill() to get a dataset.
Great it works fine up to this point. The problem was when I called dataadapter.update nothing would happen. The delete command was ignored. So I looped through the resulting dataset and deleted the record from there. Then I called dataadapter.update and it worked. I tried not setting the dataadapter.deletecommand but then update failed.
Now my question is: Is it always necessary to delete from a dataset as well as issue a delete command or is there a way of issuing just one delete command? Is it possible to simplify my code?
Any suggestions or help greatly appreciated.
Drew
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim oradb As String = "Data Source=vulcan.world;User Id=adowling;Password=aragon;"
Dim conn As New OracleConnection(oradb)
Dim cmd As New OracleCommand
Dim cmd2 As New OracleCommand
Dim orada As New OracleDataAdapter
Dim dsLog As New DataSet
Dim drDelete As DataRow
Dim myCol As DataColumn
Dim dcPK(1) As DataColumn
Dim i As Integer
Dim rc As DataRowCollection
Dim pSDEWorkspace As IWorkspaceFactory2
Try
conn.Open()
cmd.Connection = conn
cmd.CommandText = "select * from t.reconcile_log"
cmd.CommandType = CommandType.Text
orada.SelectCommand = cmd
cmd2.Connection = conn
cmd2.CommandText = "delete from t.reconcile_log where objectid = " + TextBox1.Text
cmd2.CommandType = CommandType.Text
orada.DeleteCommand = cmd2
orada.Fill(dsLog, "Reconcile_Log")
orada.MissingSchemaAction = MissingSchemaAction.AddWithKey
myCol = dsLog.Tables("Reconcile_Log").Columns.Item(dsLog.Tables("Reconcile_Log").Columns.IndexOf("OBJECTID"))
dcPK(0) = myCol
dsLog.Tables("Reconcile_Log").PrimaryKey = dcPK
drDelete = dsLog.Tables("Reconcile_Log").Rows.Find(TextBox1.Text)
drDelete.Delete()
orada.Update(dsLog, "Reconcile_Log")
ListBox1.Items.Clear()
rc = dsLog.Tables("Reconcile_Log").Rows
For i = 0 To rc.Count - 1
ListBox1.Items.Add(Convert.ToString(rc.Item(i).Item(0)) + " " + rc.Item(i).Item(1) + " submitted " + rc.Item(i).Item(2) + " on " + rc.Item(i).Item("submitted"))
Next i
Catch ex As OracleException
Select Case ex.Number
Case 1
MessageBox.Show("Error attempting to insert duplicate data.")
Case 12545
MessageBox.Show("The database is unavailable.")
Case 904
MessageBox.Show("invalid type")
Case Else
MessageBox.Show("Database error: " + ex.Message.ToString())
End Select
Catch ex As Exception
MessageBox.Show(ex.ToString)
Finally
conn.Close()
conn.Dispose()
End Try
End Sub
Because the dataset is disconnected from the database. This allows you to load some data (into your dataset), disconnect from the network or whatever, make whatever changes you like and have none of this affect the data in the database until you issue the update.
If you actually want to have your changes applied immediately then you can (assuming your application is constantly connected of course). Don't bother with a dataset/data adaptor at all. For example set up the sql select statement, assign it to a reader, execute the reader, store the rows returned in some custom objects or whatever. Make some changes and then use executeNonQuery to apply the updates, either one at a time or as a batch using array binding. There is a samples folder where you installed ODP.NET, have a look at some of the others.
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