The uncertain data requirements of Internetware lead to the DP (data pragmatics) uncertainty. And then it is required that the DP operating mechanism has the ability to adapt to the uncertain DP, i.e. the corresponding relationships between application objects and database tables can be dynamically created, updated and removed on demand. As current persistence technologies lack of dynamic adaptation of DP, this paper proposes an approach to dynamically operating DP for Internetware, POD (persistence on demand), based on ORM (object/relational mapping). Together with the mainstream ORM framework, a prototype of persistence framework following POD is implemented.