TQuery class has a member variable UpdateObject of type TUpdateSQL. I can use it for updating otherwise unupdateable queries when cached updates are enabled. Is there such mechanism in DOA so that I could provide my own database procedure calls which would be used for insert, update and delete operations on a recordset?

You can use the OnApplyRecord event for this, and the methods that support this event (SetQueryVariables, GetQueryVariables). The PkgApply example project demonstrates this. It takes a cursor result set from a package, and inserts, updates, and deletes records through program units in the same package.

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Marco Kalter
Allround Automations