web.py中如何批量更新mysql数据？

如何批量更新数据

#controllers部分：

class media_describe:
    @session.login_required
    def POST(self):
        f = web.input(image_title=[],image_describe=[],path={})
        imageTitle = f.image_title
        imageDescribe = f.image_describe
        imagePath = f.path.split(',')
        image.saveTitleDescribe(imagePath, imageTitle, imageDescribe) #更新数据库
        return view.test(imagePath, imageTitle, imageDescribe)


#models部分的image.py:

def saveTitleDescribe(imagePath, imageTitle, imageDescribe):
    for p in imagePath:
        for describe in imageDescribe:
            db.update('image', vars=dict(path=p), where='path = $path', imageDescribe = describe)
        for title in imageTitle:
            db.update('image', vars=dict(path=p), where='path = $path', imageTitle = title)