pipelines.py 文件源码

def from_settings(cls,settings):
        dbparams=dict(
            host=settings['MYSQL_HOST'],#??settings????
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',#??????????????????
            cursorclass=MySQLdb.cursors.DictCursor,
            use_unicode=False,
        )
        dbpool=adbapi.ConnectionPool('MySQLdb',**dbparams)#**?????????????,???host=xxx,db=yyy....
        return cls(dbpool)#???dbpool???????self?????