python中使用excutemany执行update语句，批量更新

# coding:utf8

import pymysql

import logging

connection = pymysql.connect(host=HOST, port=3306, user=USER, password=PASSWORD,

               db=DATABASE,charset='utf8mb4',cursorclass=pymysql.cursors.DictCursor)

cursor = connection.cursor()

flag_List = ["A", "B", "C", "D"]  # 存储flage的值

id_list = ["1", "2", "3", "4"]  # 存储id的值

commit_id_list = [(flag_List[i], id_list[i]) for i in range(len(id_list))]

# commit_id_list必须是list[tuple(),tuple()...]或tuple(tuple(),tuple()...)的形式

with connection.cursor() as cursor:

    try:

        sql = "update mydatabase SET flag=(%s) where id=(%s)"

        cursor.executemany(sql, commit_id_list)  # commit_id_list上面已经说明

        connection.commit()

    except:

        logging.exception("exception")

        connection.rollback()

connection.close()