This method returns the index of the field indicated by original fieldname
used in the "select" statement.
The original name of the field as it appears in the SQL .
set index = oradynaset.FieldOriginalNameIndex(name)
Accessing fields of a dynaset by index is more efficient than accessing them
by name. If you need to access a particular field many times, use this method to
translate its original name into its index.