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 test_should_encode_empty_node(self):
        a = Node()
        encoded = cypher_repr(a, node_template="{labels} {properties}")
        assert encoded == u"({})"