Python更新数据库数据的三种方式（update+replace）

方式一：更新 update

#!/usr/bin/env python
# coding=utf-8

import pymysql


# Python 连接MySQL-本地测试
def main():
    # 1.设置连接
    db = pymysql.connect(
        host='localhost',
        port=3306,
        user='root',
        password='123456',
        db='test',
        charset='utf8')
    #2. 游标
    cursor = db.cursor()
    # 3.写sql语句
    sql = "update test.user set name='吴老师' where age=26"

    #4. 解析sql语句
    cursor.execute(sql)
    # 5.提交
    db.commit()

if __name__ == '__main__':
    main()

方式二：追加 insert into

#!/usr/bin/env 
# coding=utf-8

import pymysql
# Python 连接MySQL-本地测试
def main():
    # 1.设置连接
    db = pymysql.connect(
        host='localhost',
        port=3306,
        user='root',
        password='123456',
        db='test',
        charset='utf8')
    #2. 游标
    cursor = db.cursor()
    # 3.写sql语句
    sql = "INSERT INTO user (name,age)VALUES('Jack','150')"
    #4. 解析sql语句
    cursor.execute(sql)
    # 5.提交
    db.commit()

if __name__ == '__main__':
    main()

方式三：存在的数据-更新；新增数据-追加 repalce into

#!/usr/bin/env 
# coding=utf-8

import pymysql
# Python 连接MySQL-本地测试
def main():
    # 1.设置连接
    db = pymysql.connect(
        host='localhost',
        port=3306,
        user='root',
        password='123456',
        db='test',
        charset='utf8')
    #2. 游标
    cursor = db.cursor()
    # 3.写sql语句
  	list1 = []
   # 列表同时添加多个值,结果为列表
  	list1.extend([imsi,twoLevelCustId,twoLevelCustName, iccid, operatorsId, operatorsName, msisdn,tradeId,apnName,apnState,totalFlow,poolId,insert_time])
	sql_insert = "replace into test.simcard_lenovo_life_cycle_dtl(imsi,twoLevelCustId, twoLevelCustName, iccid, operatorsId,operatorsName,msisdn,tradeId,apnName,apnState,totalFlow,poolId,insert_time)value(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)"
    #4. 解析sql语句
    cursor.execute(sql_insert,list1)
    # 5.提交
    db.commit()
   
if __name__ == '__main__':
    main()

注：replace into方式用之前，需要设置数据库表中字段有唯一键，或者为唯一索引。否则依然是insert into 追加。（例如设置ICCID为主键后，表中已有iccid数据会进行数据更新）