MySQL重连连接丢失：The last packet successfully received from the server的原因及解决方案

import pymysql
 
def get_db_connection():
    return pymysql.connect(host='localhost',
                           user='user',
                           password='passwd',
                           db='dbname',
                           charset='utf8mb4',
                           cursorclass=pymysql.cursors.DictCursor)
 
def execute_query(query):
    try:
        with get_db_connection() as connection:
            with connection.cursor() as cursor:
                cursor.execute(query)
                result = cursor.fetchall()
                return result
    except (pymysql.err.OperationalError, pymysql.err.InterfaceError) as e:
        print(f"Connection error: {e}")
        # 尝试重新连接
        return execute_query(query)

[mysqld]
wait_timeout = 28800
interactive_timeout = 28800

import mysql.connector
from mysql.connector import Error
 
try:
    connection = mysql.connector.connect(
        host='your_host',
        user='your_user',
        password='your_password',
        database='your_database',
        connect_timeout=60000,  # 设置连接超时时间为60秒
        connection_timeout=60000  # 设置连接超时时间为60秒
    )
 
    # 发送心跳包
    def send_heartbeat():
        if connection.is_connected():
            cursor = connection.cursor()
            cursor.execute("SELECT 1")
            cursor.fetchone()
 
    # 每隔一段时间发送一次心跳包
    import time
    while True:
        send_heartbeat()
        time.sleep(30)  # 每30秒发送一次心跳包
 
except Error as e:
    print(f"Error: {e}")

from sqlalchemy import create_engine
from sqlalchemy.pool import QueuePool
 
engine = create_engine(
    'mysql+mysqlconnector://your_user:your_password@your_host/your_database',
    poolclass=QueuePool,
    pool_size=10,
    max_overflow=20,
    pool_recycle=3600  # 连接池中连接的最大存活时间
)
 
with engine.connect() as connection:
    result = connection.execute("SELECT * FROM your_table")
    for row in result:
        print(row)

import mysql.connector
from mysql.connector import Error
 
def execute_query(query):
    try:
        connection = mysql.connector.connect(
            host='your_host',
            user='your_user',
            password='your_password',
            database='your_database'
        )
        cursor = connection.cursor()
        cursor.execute(query)
        result = cursor.fetchall()
        return result
    except Error as e:
        if "Lost connection to MySQL server" in str(e):
            print("Connection lost, attempting to reconnect...")
            return execute_query(query)  # 递归调用，尝试重新执行查询
        else:
            raise e
    finally:
        if connection.is_connected():
            cursor.close()
            connection.close()
 
result = execute_query("SELECT * FROM your_table")
for row in result:
    print(row)