def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def deactivate(cls):
        """
        Syntax sugar, return to public schema

        Usage:
            test_tenant.deactivate()
            # or simpler
            Tenant.deactivate()
        """
        connection = connections[get_tenant_database_alias()]
        connection.set_schema_to_public()