下面是mysql insert语句，如果有记录，我想更新所有字段（除了主键）。因为最多有80列，所以我不想逐个编写键和值对。有人能帮忙吗？
下面是我的代码：

# Save item to database

def process_item(self, item, _):
    with self.conn.cursor() as c:
        c.execute(self.query(item), item.values())
def query(self, item):
    return "INSERT INTO income_statement ({columns}) VALUES ({values}) ON DUPLICATE KEY UPDATE ({columns}) = VALUES({columns})".format(
        columns=', '.join(item.keys()),
        values=', '.join(['%s'] * len(item))
    )

我有个错误：

ProgrammingError: (1064, u"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(unit_name, fd_stock_dividend, fd_administration_fee, fd_depreciation, fd_divide' at line 1")