如何更新现有行(而不是创建一个已更新的新行)

import mysql.connector

# 连接到MySQL数据库
cnx = mysql.connector.connect(user='username', password='password',
                              host='localhost', database='database_name')

# 创建游标对象
cursor = cnx.cursor()

# 构建更新语句
update_query = "UPDATE table_name SET column1 = %s, column2 = %s WHERE id = %s"

# 定义要更新的新值
new_value1 = "New value 1"
new_value2 = "New value 2"
row_id = 1

# 执行更新语句
cursor.execute(update_query, (new_value1, new_value2, row_id))

# 提交更改
cnx.commit()

# 验证更新是否成功
select_query = "SELECT * FROM table_name WHERE id = %s"
cursor.execute(select_query, (row_id,))
updated_row = cursor.fetchone()

print("Updated row:", updated_row)

# 关闭游标和数据库连接
cursor.close()
cnx.close()