Mysql连接在节点js中一段时间​​后关闭并给出PROTOCOL_CONNECTION_LOST'

Posted 2023-02-24

【中文标题】Mysql连接在节点js中一段时间​​后关闭并给出PROTOCOL_CONNECTION_LOST\'

【英文标题】：Mysql connection closed after some time in node js and gives PROTOCOL_CONNECTION_LOST'Mysql连接在节点js中一段时间​​后关闭并给出PROTOCOL_CONNECTION_LOST'

【发布时间】：2018-05-03 13:55:49

【问题描述】：

我是节点 mysql 的新手，我遇到了一个问题。 我的节点 js 服务器关闭并关闭连接 PROTOCOL_CONNECTION_LOST。我不明白我哪里出错了。如果有人对此有所了解，请解决。提前致谢

var sockjs = require('sockjs');
var mysql = require('mysql');

var connection = mysql.createConnection(
  host     : process.env.IP,
  user     : 'root',
  port     : '80',
  password : '123456',
  database : 'test',
);

connection.connect(function(err) 
    if(err)
        console.log('error in connection is : ',err);
    else
        console.log("Connected!");
    
);

var echo = sockjs.createServer();
var connections = [];


echo.on('connection', function (conn) 
    connections.push(conn);
    conn.on('data', function (message)         

        var sql1 = "SELECT count(`id`) as counting FROM `complaints_chat` WHERE `createby`='client' and `read`='0'";
        connection.query(sql1, function(err, rows, fields) 
            if (err) throw err;
            if (rows.length > 0) 
                counting=rows[0]['counting'];
            else counting=0;   
        );
    );
);

【问题讨论】：

Did you read this?

nodejs mysql Error: Connection lost The server closed the connection的可能重复

尝试使用池化：github.com/mysqljs/mysql#pooling-connections

【参考方案1】：

你可以恢复连接，当它断开时。例如

connection.on('error', err => 
        if (err.code === 'PROTOCOL_CONNECTION_LOST') 
            // db error reconnect
            disconnect_handler();
         else 
            throw err;
        
    );

【讨论】：

如果没有网络连接会造成无限循环吗？