Reads the new contents of the calling
RowSet object.
In order to call this method, a
RowSet
object must have implemented the
RowSetInternal interface
and registered this
RowSetReader object as its reader.
The
readData method is invoked internally
by the
RowSet.execute method for rowsets that support the
reader/writer paradigm.
The
readData method adds rows to the caller.
It can be implemented in a wide variety of ways and can even
populate the caller with rows from a nonrelational data source.
In general, a reader may invoke any of the rowset's methods,
with one exception. Calling the method
execute will
cause an
SQLException to be thrown
because
execute may not be called recursively. Also,
when a reader invokes
RowSet methods, no listeners
are notified; that is, no
RowSetEvent objects are
generated and no
RowSetListener methods are invoked.
This is true because listeners are already being notified by the method
execute.