def insertDomain(self, domain, indegree=0, outdegree=0):
		'''增加一个域名'''
		cur = self.conn.cursor()
		cur.execute("INSERT INTO Domains VALUES (NULL,?,?,?)", (domain, indegree, outdegree))
		# 写入到文件中
		self.conn.commit()
def _Create(self):
    """Create the log group."""
    create_cmd = util.AWS_PREFIX + [
        '--region', self.region,
        'logs', 'create-log-group',
        '--log-group-name', self.name
    ]
    vm_util.IssueCommand(create_cmd)