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Lost connection to MySQL server during Python connection


Lost connection to MySQL server during Python connection

By : user2956131
Date : November 22 2020, 10:54 AM
this will help As a print of nested query result I face this problem my Python query would fail with the error described in the question after returning just a subset of results.
As my way you Switched to PyMySQL and things work as you like
code :
 import pymysql
 connection = pymysql.connect(user='XYZ', passwd='XYZ',host='XYZ',database='XYZ')
 cursor = connection.cursor()
 query = ("YOUR_QUERY")
 cursor.execute(query)
 for item in cursor:
     print item


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Heroku and NodeJs - MySql Connection lost: The server closed the connection

Heroku and NodeJs - MySql Connection lost: The server closed the connection


By : germin8
Date : March 29 2020, 07:55 AM
should help you out You already seem to know what is happening; the MySQL server is closing the connection. Many database services, including ClearDB, to do this (ie, close inactive connections). You're going to have to detect the disconnect event, and recreate the connection.
There are instructions in the node-mysql documentation for doing this.
nodejs mysql Error: Connection lost The server closed the connection

nodejs mysql Error: Connection lost The server closed the connection


By : Noah Anderson
Date : March 29 2020, 07:55 AM
should help you out Try to use this code to handle server disconnect:
code :
var db_config = {
  host: 'localhost',
    user: 'root',
    password: '',
    database: 'example'
};

var connection;

function handleDisconnect() {
  connection = mysql.createConnection(db_config); // Recreate the connection, since
                                                  // the old one cannot be reused.

  connection.connect(function(err) {              // The server is either down
    if(err) {                                     // or restarting (takes a while sometimes).
      console.log('error when connecting to db:', err);
      setTimeout(handleDisconnect, 2000); // We introduce a delay before attempting to reconnect,
    }                                     // to avoid a hot loop, and to allow our node script to
  });                                     // process asynchronous requests in the meantime.
                                          // If you're also serving http, display a 503 error.
  connection.on('error', function(err) {
    console.log('db error', err);
    if(err.code === 'PROTOCOL_CONNECTION_LOST') { // Connection to the MySQL server is usually
      handleDisconnect();                         // lost due to either server restart, or a
    } else {                                      // connnection idle timeout (the wait_timeout
      throw err;                                  // server variable configures this)
    }
  });
}

handleDisconnect();
Lost connection to MySQL server at 'reading initial communication packet' when frequent connection

Lost connection to MySQL server at 'reading initial communication packet' when frequent connection


By : user2413097
Date : March 29 2020, 07:55 AM
This might help you After googling I find that some times it happen, and reboot can solve problem. I reboot my system and script work correct.
Error: Connection lost: The server closed the connection. mysql node

Error: Connection lost: The server closed the connection. mysql node


By : user1928420
Date : March 29 2020, 07:55 AM
this will help I would suggest using Sequelize ORM. It abstracts away writing raw SQL and it is much safer.
Nodejs, mysql 'connection lost the server closed the connection'

Nodejs, mysql 'connection lost the server closed the connection'


By : user2948672
Date : March 29 2020, 07:55 AM
it fixes the issue You can try to use this code to handle server disconnect:
code :
var mysql = require("mysql");
var configuration = {
  host: "localhost",
  user: "root",
  password: "mysql",
  database: "blog"
};
var connection;

function handleDisconnect() {
  connection = mysql.createConnection(configuration);

  connection.connect(function(err) {
    if (err) {
      console.log("error when connecting to db:", err);
      setTimeout(handleDisconnect, 2000);
    }else{
        console.log("connection is successfull");
    }
  });
  connection.on("error", function(err) {
    console.log("db error", err);
    if (err.code === "PROTOCOL_CONNECTION_LOST") {
      handleDisconnect();
    } else {
      throw err;
    }
  });
}
handleDisconnect();
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