Python：mysql-connector-python查询不到新增数据

查询代码

# -*- coding: utf-8 -*-
import time

import mysql.connector

config = {
    "database": "data",
    "username": "root",
    "password": "123456",
    "host": "127.0.0.1",
    "port": 3306
}

connect = mysql.connector.Connect(**config)
cursor = connect.cursor(dictionary=True)

while True:

    cursor.execute("SELECT * FROM person")
    result = cursor.fetchall()  # fetchall() 获取所有记录

    time.sleep(2)
    print(result)

# 关闭游标和连接
cursor.close()
connect.close()

当执行以上代码时，在MySQL数据库修改数据（增、删、改）没法获取到修改后的数据

翻阅文档​​10.2.35 MySQLConnection.autocommit Property​​发现一句话

When the autocommit is turned off, 
you must commit transactions when using transactional storage engines such as InnoDB or NDBCluster.

经测试，以下两个方式都能解决查询新数据的问题

1. 1. 
      
2. 配置参数​​autocommit=True​​
3. 执行后手动​​commit​​
   1. 
      

修改后的代码如下

# -*- coding: utf-8 -*-
import time

import mysql.connector

config = {
    "database": "data",
    "username": "root",
    "password": "123456",
    "host": "127.0.0.1",
    "port": 3306,
    "autocommit": True
}

connect = mysql.connector.Connect(**config)
cursor = connect.cursor(dictionary=True)

while True:

    cursor.execute("SELECT * FROM person")
    result = cursor.fetchall()  # 获取所有记录

    time.sleep(2)
    print(result)
    print(connect.in_transaction)

    # 如果不commit，数据库新增、删除、修改的数据没法查询到
    # connect.commit()

# 关闭游标和连接
cursor.close()
connect.close()