Scrapy 管道连接 MySQL 报错，错在哪？

class mysqlPipeline(object):    conn = None    cursor = None    # 连接数据库    def opens_spider(self, spider):  # 函数名应为 open_spider，而非 opens_spider        self.conn = pymysql.Connect(host='127.0.0.1', port=3306, user='root', password='123456', db='test',charset='utf8')