def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def getProvides(self):
		"""Fetch a spec file from pkgdb and get provides from all its [sub]packages"""
		if self.sp_obj == None:
			return {}

		return self.sp_obj.getProvides()