About View Object Java Classes

An view object definition always has an associated XML file. It optionally has up to two Java source files — a view object class and a view row class.

The view object class

Instances of the view object class are view object instances; that is, they represent a particular reference to a Oracle ADF view object definition within an application module definition. View object classes extend the class oracle.jbo.server.ViewObjectImpl. View objects can simply use instances of ViewObjectImpl as their view object instances.

The main reason to generate custom view object classes is to write view object service methods, methods that perform complex operations on an entire set of data (usually the result set of a query). These methods can be called from clients, requiring very little data manipulation processing in the client itself. For more information, see the realted topics list.

The view row class

Instances of the view row class represent one row of data returned by the view object's data retrieval mechanism (usually a SQL query). View row classes extend the class oracle.jbo.server.ViewRowImpl. View objects can simply use instances of ViewRowImpl to represent their rows; however, there are two advantages to generating custom view row classes.

View row classes provide typesafe getters and setters for each attribute. If you don't generate view row classes, you must use ViewRowImpl.getAttribute() and ViewRowImpl.setAttribute() , which are not typesafe.
View row classes allow you to write view row service methods, methods that perform complex operations on a single row of data. These methods can be called from clients, requiring very little data manipulation processing in the client itself. For more information, see the realted topics list.