Develop Reference

I am getting an error while connecting to mysql database

I am trying to input some data into a mysql database, but I can't connect to it.
My code:
var mysql = require('mysql');
var con = mysql.createConnection({
host: "localhost",
user: "yourusername",
password: "yourpassword"
});
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
});
I have also installed mysql into my system by using npm install mysql in cmd. Whenever I try to execute the above code, I get this error:
C:\Users\Abhishek\Desktop\Data scraping\scraping.js:60
if (err) throw err;
^
Error: connect ECONNREFUSED 127.0.0.1:3306
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1129:16)
--------------------
at Protocol._enqueue (C:\Users\Abhishek\node_modules\mysql\lib\protocol\Protocol.js:144:48)
at Protocol.handshake (C:\Users\Abhishek\node_modules\mysql\lib\protocol\Protocol.js:51:23)
at Connection.connect (C:\Users\Abhishek\node_modules\mysql\lib\Connection.js:116:18)
at Object.<anonymous> (C:\Users\Abhishek\Desktop\Data scraping\scraping.js:59:5)
at Module._compile (node:internal/modules/cjs/loader:1083:30)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1112:10)
at Module.load (node:internal/modules/cjs/loader:948:32)
at Function.Module._load (node:internal/modules/cjs/loader:789:14)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:72:12)
at node:internal/main/run_main_module:17:47 {
errno: -4078,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 3306,
fatal: true
}
How do I fix this?

Unable to connect to remote MySQL database with mysql package

I have tried to connect to my remote MySQL database server with npm's mysql package but it keeps on throwing this error
But it works fine when I use mysqli with PHP
ERROR:
Error: connect ETIMEDOUT
at PoolConnection.Connection._handleConnectTimeout (/home/rilla/Desktop/dbTest/node_modules/mysql/lib/Connection.js:409:13)
at Object.onceWrapper (events.js:416:28)
at Socket.emit (events.js:310:20)
at Socket._onTimeout (net.js:479:8)
at listOnTimeout (internal/timers.js:549:17)
at processTimers (internal/timers.js:492:7)
--------------------
at Protocol._enqueue (/home/rilla/Desktop/dbTest/node_modules/mysql/lib/protocol/Protocol.js:144:48)
at Protocol.handshake (/home/rilla/Desktop/dbTest/node_modules/mysql/lib/protocol/Protocol.js:51:23)
at PoolConnection.connect (/home/rilla/Desktop/dbTest/node_modules/mysql/lib/Connection.js:116:18)
at Pool.getConnection (/home/rilla/Desktop/dbTest/node_modules/mysql/lib/Pool.js:48:16)
at Object.<anonymous> (/home/rilla/Desktop/dbTest/test.js:22:6)
at Module._compile (internal/modules/cjs/loader.js:1133:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)
at Module.load (internal/modules/cjs/loader.js:977:32)
at Function.Module._load (internal/modules/cjs/loader.js:877:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12) {
errorno: 'ETIMEDOUT',
code: 'ETIMEDOUT',
syscall: 'connect',
fatal: true
}
MY CODE:
// Get the mysql service
var mysql = require("mysql");
// Add the credentials to access your database
// var connection = mysql.createConnection({
// host: "my_host", // hosts IP here
// port: 3306,
// user: "my_username",
// password: "my_password",
// database: "my_database",
// });
var pool = mysql.createPool({
connectionLimit: 100,
host: "my_host", // hosts IP here
port: 3306,
user: "my_username",
password: "my_password",
database: "my_database",
});
pool.getConnection(function (err, conn) {
if (err) {
console.log(err);
} else {
console.log('it works now')
}
});
// connect to mysql
// connection.connect(function (err) {
// // in case of error
// if (err) {
// console.log(err);
// console.log(err.code);
// console.log(err.fatal);
// } else {
// console.log('it works now')
// }
// });
I have tried with sequelize too but no avail. I can't figure why it's not connecting

rror: connect ENOENT /Applications/MAMP/tmp/mysql/mysql.sock

i have a problem that i cant use mysql server. so i asked the solution in stackoverflow and other error was happend..
var mysql = require("mysql");
var connection = mysql.createConnection({
host: "127.0.0.1",
user: "root",
password: "111111",
database: "opentutorials",
socketPath: "/Applications/MAMP/tmp/mysql/mysql.sock"
});
connection.connect();
connection.query("SELECT * FROM topic", function(error, results, fields) {
if (error) {
console.log(error);
}
console.log(results);
});
connection.end();
here is my code and the error
Error: connect ENOENT /Applications/MAMP/tmp/mysql/mysql.sock
at PipeConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
--------------------
at Protocol._enqueue (/Users/junggri/Desktop/mysql/node_modules/mysql/lib/protocol/Protocol.js:144:48)
at Protocol.handshake (/Users/junggri/Desktop/mysql/node_modules/mysql/lib/protocol/Protocol.js:51:23)
at Connection.connect (/Users/junggri/Desktop/mysql/node_modules/mysql/lib/Connection.js:119:18)
at Object. (/Users/junggri/Desktop/mysql/nodejs/mysql.js:11:12)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
errno: 'ENOENT',
code: 'ENOENT',
syscall: 'connect',
address: '/Applications/MAMP/tmp/mysql/mysql.sock',
fatal: true }

node.js won't connect to mysql

Code:
var mysql = require('mysql');
var db_config = require('./db-config.json');
var connection = mysql.createConnection({
host: db_config.host,
user: db_config.user,
port: db_config.port,
password: db_config.password,
database: db_config.database
});
connection.connect(function(err){
if (!err) {
console.log("Database is connected... \n\n");
} else {
console.log("Error connecting database \n\n" + err);
}
});
connection.query('select 1+1 as solution', function(err, rows, fields){
if(err) throw err;
console.log('The solution is: ', rows[0].solution);
});
connection.end();
and my ./db-config.json is
{
"host": "**.*.**.***",
"user": "***",
"port": "13306",
"password": "****",
"database": "***"
}
and error is
Error connecting database
Error: Connection lost: The server closed the connection.
C:\project\Nodejs\my-app\routes\db\dbtest.js:21
if(err) throw err;
^
Error: Connection lost: The server closed the connection.
at Protocol.end (C:\project\Nodejs\node_modules\mysql\lib\protocol\Protocol.js:113:13)
at Socket.<anonymous> (C:\project\Nodejs\node_modules\mysql\lib\Connection.js:109:28)
at emitNone (events.js:111:20)
at Socket.emit (events.js:208:7)
at endReadableNT (_stream_readable.js:1055:12)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickCallback (internal/process/next_tick.js:180:9)
--------------------
at Protocol._enqueue (C:\project\Nodejs\node_modules\mysql\lib\protocol\Protocol.js:145:48)
at Protocol.handshake (C:\project\Nodejs\node_modules\mysql\lib\protocol\Protocol.js:52:23)
at Connection.connect (C:\project\Nodejs\node_modules\mysql\lib\Connection.js:130:18)
at Object.<anonymous> (C:\project\Nodejs\my-app\routes\db\dbtest.js:12:12)
at Module._compile (module.js:643:30)
at Object.Module._extensions..js (module.js:654:10)
at Module.load (module.js:556:32)
at tryModuleLoad (module.js:499:12)
at Function.Module._load (module.js:491:3)
at Function.Module.runMain (module.js:684:10)
This is very strange because this database is already used in another program and its works just fine.
I think the code itself is the problem because my local mysql has no problem.
I just start learning nodejs & express and at stuck at this very basic stage. Any help is appreciated.

You are ending the connection to the DB before the callbacks do their job.
var mysql = require('mysql');
var db_config = require('./db-config.json');
var connection = mysql.createConnection({
host: db_config.host,
user: db_config.user,
port: db_config.port,
password: db_config.password,
database: db_config.database
});
connection.connect(function(err){
if (err) {
console.log("Error connecting database \n\n" + err);
throw err
}
connection.query('select 1+1 as solution', function(err, rows, fields){
if(err) throw err;
console.log('The solution is: ', rows[0].solution);
connection.end();
});
});
Callbacks don't execute immediately, they are asynchronous. Your code is getting to connection.end() before it has done all the async operations.

error while creating database using node js

I am new to node js and i am trying to create a database.
i copied code from w3school and tried to run in my pc.
i got the following error:
C:\Users\HP\Desktop>node db.js
C:\Users\HP\Desktop\db.js:10
if (err) throw err;
^
Error: connect ECONNREFUSED 127.0.0.1:3306
at Object._errnoException (util.js:999:13)
at _exceptionWithHostPort (util.js:1020:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1207:14)
--------------------
at Protocol._enqueue (C:\Users\HP\node_modules\mysql\lib\protocol\Protocol.j
s:145:48)
at Protocol.handshake (C:\Users\HP\node_modules\mysql\lib\protocol\Protocol.
js:52:23)
at Connection.connect (C:\Users\HP\node_modules\mysql\lib\Connection.js:130:
18)
at Object.<anonymous> (C:\Users\HP\Desktop\db.js:9:5)
at Module._compile (module.js:660:30)
at Object.Module._extensions..js (module.js:671:10)
at Module.load (module.js:573:32)
at tryModuleLoad (module.js:513:12)
at Function.Module._load (module.js:505:3)
at Function.Module.runMain (module.js:701:10)
C:\Users\HP\Desktop>
db.js:
var mysql = require('mysql');
var con = mysql.createConnection({
host: "localhost",
user: "myusername",
password: "mypassword"
});
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
/*Create a database named "mydb":*/
con.query("CREATE DATABASE mydb", function (err, result) {
if (err) throw err;
console.log("Database created");
});
});
I am completely new to node js.