def visit_on_conflict_do_nothing(self, on_conflict, **kw):
    target_text = self._on_conflict_target(on_conflict, **kw)
    if target_text:
        return ('ON CONFLICT %s DO NOTHING' % target_text)
    else:
        return 'ON CONFLICT DO NOTHING'
def visit_on_conflict_do_nothing(self, on_conflict, **kw):
    target_text = self._on_conflict_target(on_conflict, **kw)
    if target_text:
        return ('ON CONFLICT %s DO NOTHING' % target_text)
    else:
        return 'ON CONFLICT DO NOTHING'