2.3.1     Notifying Listeners

Being a JavaBeans component means that a RowSet object can notify other components when certain things happen to it. For example, if data in a RowSet object changes, the RowSet object can notify interested parties of that change.

A listener for a RowSet object is a component that implements the following

methods from the RowSetListener interface:

• cursorMoved—defines what the listener will do, if anything, when the cursor

in the RowSet object moves

• rowChanged—defines what the listener will do, if anything, when one or

more column values in a row have changed, a row has been inserted, or a

row has been deleted

• rowSetChanged—defines what the listener will do, if anything, when the

RowSet object has been populated with new data.

An example of a component that might want to be a listener is a BarGraph object

that graphs the data in a RowSet object. As the data changes, the BarGraph object

can update itself to reflect the new data.

Add a listener :

crs.addRowSetListener(bar);

Remove a listener:

                            crs.removeRowSetListener(bar);