def robotsrulesetOfDomain(self, domain):
		'''检查domain是否在数据库中,
			否 --> (False, None)
			是 --> (True, 数据库中存储的robots.txt内容)
		'''
		exist = False
		cur = self.conn.cursor()
		# 是否存在
		cur.execute("SELECT 1 FROM Domains WHERE domain=?", (domain,))
		if cur.fetchone() :
			exist = True
		# 存在的话,结果是什么
		cur.execute("SELECT rules FROM Domains,Rulesets "
			"WHERE domain=? AND Domains.did=Rulesets.did"
			,(domain,) )
		ruleset = cur.fetchone()
		return (exist, ruleset)
def _checkProvenance(self, resp, item, version, user, eventType,
                         matches=None, fileInfo=None, resource='item'):
        if resp is None:
            resp = self._getProvenance(item, user, resource=resource)
        self.assertStatusOk(resp)
        itemProvenance = resp.json
        self.assertEqual(itemProvenance['resourceId'], str(item['_id']))
        provenance = itemProvenance['provenance']
        self.assertEqual(provenance['eventType'], eventType)
        self.assertEqual(provenance['version'], version)
        self.assertEqual(str(provenance['eventUser']), str(user['_id']))
        if matches:
            for key in matches:
                self.assertEqual(provenance[key], matches[key])
        if fileInfo:
            for key in fileInfo:
                if isinstance(fileInfo[key], dict):
                    for subkey in fileInfo[key]:
                        self.assertEqual(provenance['file'][0][key][subkey],
                                         fileInfo[key][subkey])
                else:
                    self.assertEqual(provenance['file'][0][key], fileInfo[key])