[[u'ns=2;i=1001', u'\u5de5\u63a7\u573a\u7ad91\uff08\u56fd\u7f51\uff09', u'SubStation', u'\u53d8\u7535\u7ad9'], [u'ns=2;i=1002', u'\u5de5\u63a7\u573a\u7ad92\uff08\u5357\u7f51\uff09', u'SubStation', u'\u53d8\u7535\u7ad9'], [u'ns=2;i=1003', u'\u5de5\u63a7\u573a\u7ad93\uff08\u73e0\u6d77\u9e3f\u745e\uff09', u'SubStation', u'\u53d8\u7535\u7ad9'], [u'ns=2;i=1004', u'TEST', u'SubStation', u'\u53d8\u7535\u7ad9']]
通过cursor.fetchall() 返回的这样一个元组怎么覆盖A表的数据(A表原本有数据)