@classmethod
def select_many(cls, **kwargs):
    ms = mysql_conn.Mysql()
    if kwargs:
        key = list(kwargs.keys())[0]
        value = kwargs[key]
        sql = ('select * from %s where %s=?' % (cls.table_name, key))
        sql = sql.replace('?', '%s')
        re = ms.select(sql, value)
    else:
        sql = ('select * from %s' % cls.table_name)
        re = ms.select(sql, None)
    if re:
        return list((cls(**r) for r in re))
    else:
        return
@classmethod
def select_many(cls, **kwargs):
    ms = mysql_conn.Mysql()
    if kwargs:
        key = list(kwargs.keys())[0]
        value = kwargs[key]
        sql = ('select * from %s where %s=?' % (cls.table_name, key))
        sql = sql.replace('?', '%s')
        re = ms.select(sql, value)
    else:
        sql = ('select * from %s' % cls.table_name)
        re = ms.select(sql, None)
    if re:
        return list((cls(**r) for r in re))
    else:
        return