'Return the upgrade script for a specific version.
:param current_version: the version of the script to return.'

def get_upgrade_script(self, current_version):

    if ((current_version == 2) or (current_version == 3)):
        return (u'\n                                                DROP    TABLE    IF    EXISTS    %s;\n                                                DROP    TABLE    IF    EXISTS    option;\n                                                ' % self.db_name)
