'Receive a row when a new object instance is about to be
created from that row.
The method can choose to create the instance itself, or it can return
EXT_CONTINUE to indicate normal object creation should take place.
mapper
The mapper doing the operation
selectcontext
The QueryContext generated from the Query.
row
The result row from the database
class\_
The class we are mapping.
return value
A new object instance, or EXT_CONTINUE'

def create_instance(self, mapper, selectcontext, row, class_):

    return EXT_CONTINUE
