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 step_impl(context, user_names_str):
    if not hasattr(context, 'users'):
        context.users = {}

    user_names = [name.strip() for name in re.split('and|,', user_names_str)]
    for user_name in user_names:
        token = 'fake_token_' + user_name
        user_id = context.helpers.create_test_user(user_name, token)
        context.users[user_name] = {'token': token, 'id': user_id}