def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def visitdir(self, dir):
        r = False
        for m in self._matchers:
            v = m.visitdir(dir)
            if v == "all":
                return v
            r |= v
        return r