Is a view object really a data collection?
This may be the first question that you may ask when you start using view object instances exposed through the data control panel for building a UI.
Yes, the view object instance is a data collection (row set) in itself. To understand this point let us take a step back and take a closer look at the structure of the view object. The following class diagram represents the
oracle.jbo.server.ViewObjectImpl class and its associated infrastructure classes namely oracle.jbo.server.ViewRowSetImpl and oracle.jbo.server.ViewRowSetIteratorImpl.
The following list discusses the roles of each class in brief from the above diagram:
A view object (
oracle.jbo.server.ViewObjectImpl) contains logic for controlling the query execution.A view object uses a row set class (
oracle.jbo.server.ViewRowSetImpl) to manage the collections of view rows read from a query. A view object may have multiple row sets—a default (primary) row set and secondary row sets. When the client...
