Data layer.

>Hi,
>If i use CA (CursorAdapters) and ADODB, then in CA.Init Method, i have some like:
>

>loConnDataSource = createobject('ADODB.Connection')
>***<DataSource>
>loConnDataSource.ConnectionString = [Provider=SQLOLEDB;Integrated Security=SSPI; Initial Catalog=Northwind;Data] + ;
>	[ Source=(local);]
>***</DataSource>
>loConnDataSource.Open()
>this.DataSource = createobject('ADODB.RecordSet')
>

>
>But, if i use CA, ADODB and 3-Tier model (User Interface, Business Logic and Data Layer), where is there (which layer,which method) ADODB commands like oConn.Open(),oConn.BeginTrans(), oRS.ActiveConnection = oConn, oRS.UpdateBatch(), oConn.RollbackTrans(), oRS.CancelBatch(), oConn.CommitTrans()... my question: which layer?)?
>Please, example.
>Thanks.