var mysql = require('mysql');
var client = mysql.createClient({
user: 'myusername',
password: 'mypassword',
});
client.query('USE mydb');
A simple setup like this using node's mysql is returning an ECONNREFUSED error, although the credentials are correct and permissions are updated. I have even used a different node module to successfully connect/query the database using the same credentials, but the syntax of this module is in my opinion far superior.
Anyone have an idea whats causing this to go wrong?
Error:
node.js:201
throw e; // process.nextTick error, or 'error' event on first tick
^
Error: connect ECONNREFUSED
In mysql.conf, comment skip-networking.
For creating the database you need to use the command CreateConnection and not createClient, make the necessary changes and that should work !
var mysql = require('mysql');
var client = mysql.createConnection({
host: 'localhost',
user: 'myusername',
password: 'mypassword',
});
client.query('USE mydb');
Note that you have not mentioned which database you are accessing !
Source for this solution:: Check NODEJS Github here
Related
Trying to build a backend database for my React app, and upon trying to import the relevant MySQL libraries, it throws an error. There are no problems when I run it from the terminal, but the moment I put it in, I receive the following error:
./src/data/node_modules/mysql/node_modules/safe-buffer/index.js
Line 1:1: Definition for rule 'node/no-deprecated-api' was not found node/no-deprecated-api
Have not been able to find any solutions while searching.
My code:
import {mysql} from 'mysql'; // Commenting out this one line stops the error
export default function tester() {
/*
const connection = mysql.createConnection({ // Commented out only when import is commented
host: 'localhost',
user: '<username>',
password: '<password>',
database: '<db name>'
});
connection.connect((err) => {
if (err) throw err;
console.log('Connected!');
});
*/
}
To anyone reading this in the future, the solution was to not connect directly to the MySQL server, instead to use Express.
I have node.js Lambda function on AWS and a MySQL database. I have been using the following code to connect:
const mysql = require('mysql');
const con = mysql.createConnection({
host: "<endpoint>",
user: "<user>",
password: "<password>"
});
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
con.end();
});
When I try to connect to the endpoint I get the message:
{"message": "Internal server error"}
Any help would be much appreciated! Hope everyone is healthy.
It is most likely an RDS set-up.
Check the security settings on your security group.
Does it have a rule that only allows a connection from a certain security group?
Also, does your RDS have Public Accessibility? you would want to set it to 'Yes'
The port seems to be missing in your createConnection function, I've seen people skip this while others needed to have it.
Another thing for debugging purpose get the stack as well, it will take you there :)
conn.connect(function(err){
if (err){
console.error('db connection failed: ' + err.stack);
return;
}
console.log('connected to db');
});
connection.end();
Check this link to AWS docs, it is for elastic beanstalk, but it's the same :)
Here is another link/blog post to get you there: using was rds with nodejs
First of all, I'm a beginner on NodeJS. Well, I'm using a shared hosting to my project and when the database reaches 1 minute of inactivity, NodeJS crashes and disconnects me from MySQL. Since I'm using a shared hosting, I can't edit the idle time on the MySQL config and I'll need to handle it in code.
I'm using module.exports to handle my connection, as shown below. So how can I make an auto-reconnection script to take care of my issue? Thank you.
var mysql = require('mysql');
module.exports =
{
handle: null,
connect: function(call){
this.handle = mysql.createConnection({
host : 'localhost',
user : 'root',
password : '',
database : 'test',
timezone: 'utc',
charset : 'utf8'
});
this.handle.connect(function (err) {
if(err) {
console.log("[MySQL] Connection error: " + err.code);
} else {
console.log("[MySQL] Successfully connected");
}
});
}
};
The node mysql module that you are using also has a connection pooling mechanism.
Check out the docs at https://github.com/mysqljs/mysql#pooling-connections
Connection pools will make you task easier. You can then store the connection pool object and use its getConnection method to obtain a connection. Make sure that you release the connection when you are done with it.
If for some reason you cant use connection pooling then you will have to listen for error event on the connection and handle it accordingly. But I strongly recommend that you use connection pool.
I am trying to connect mysql with nodejs, but there is a problem in my code, please help!
var express = require("express");
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : 'admin',
database : 'dbname',
});
var app = express();
connection.connect(function(err){
if(!err) {
console.log("Database is connected ... \n\n");
} else {
console.log("Error connecting database ... \n\n");
}
});
app.listen(3000);
in terminal i am getting this output:
voldemort#Lenovo:~/Documents/cloudprint$ node server.js
Error connecting database ...
The MySQL client establishes a connection to the server using secure authentication by default.
insecureAuth: Allow connecting to MySQL instances that ask for the old (insecure) authentication method. (Default: false) 1
Looking at the error traceback in your comment, it looks like your server isn't currently configured to allow secure authentication. 2
If your MySQL server version is <= 5.6.4 then secure auth is off and you may want to enable the old auth protocol by enabling insecureAuth when making the connection in the client.
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : 'admin',
database : 'dbname',
insecureAuth: true
});
However, I advise updating the passwords for your users to use the more secure password hashing function if your MySQL server version is >= 5.6.5.
There is step-by-step documentation to accomplish this for user accounts.
You may also want to update your MySQL server if you find that you're running an older version that doesn't support the secure auth protocol.
ANy idea how can I connect from NodeJs to the Mysql ClearDB on Heroku?
I was able to connect to the ClearDB Mysql runing on Heroku from Navicat, I even created a table called t_users. But I'm having problems connecting from NodeJs from Heroku.
This is my code, it is very simple: everything works find until it tries to connect to MySQL
web.js:
var express = require("express");
var app = express();
app.use(express.logger());
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'us-cdbr-east-04.cleardb.com',
user : '',
password : '',
database : ''
});
connection.connect();
app.get('/', function(request, response) {
response.send('Hello World!!!! HOLA MUNDOOOOO!!!');
connection.query('SELECT 1 + 1 AS solution', function(err, rows, fields) {
if (err) throw err;
response.send('The solution is: ', rows[0].solution);
});
});
var port = process.env.PORT || 5000;
app.listen(port, function() {
console.log("Listening on " + port);
});
This is what I got when I run on the command line: Heroku config
C:\wamp\www\Nodejs_MySql_Heroku>heroku config
=== frozen-wave-8356 Config Vars
CLEARDB_DATABASE_URL: mysql://b32fa719432e40:87de815a#us-cdbr-east-04.cleardb.com/heroku_28437b49d76cc53?reconnect=true
PATH: bin:node_modules/.bin:/usr/local/bin:/usr/bin:/bin
This is the LOG:
http://d.pr/i/cExL
ANy idea how can I connect from NodeJs to the Mysql ClearDB on Heroku?
Thanks
Try this. Hope this will help you
mysql://b32fa719432e40:87de815a#us-cdbr-east-04.cleardb.com/heroku_28437b49d76cc53?reconnect=true
var connection = mysql.createConnection({
host : 'us-cdbr-east-04.cleardb.com',
user : 'b32fa719432e40',
password : '87de815a',
database : 'heroku_28437b49d76cc53'
});
Use this details and connect it in mySQL work bench, and import your localhost db
The base code was ok, I missed some NodeJS code.
I did a video explaining how to connect to MySqlusing NodeJS on a Heroku server, take a look:
http://www.youtube.com/watch?v=2OGHdii_42s
This is the code in case you want to see:
https://github.com/mescalito/MySql-NodeJS-Heroku
createConnections accepts config as well as connectionString.
export function createConnection(connectionUri: string | ConnectionConfig): Connection;
So below solution would work.
var connection = mysql.createConnection('mysql://b32fa719432e40:87de815a#us-cdbr-east-04.cleardb.com/heroku_28437b49d76cc53?reconnect=true);
or you can set the connection url in environment variable DATABASE_URL
var connection = mysql.createConnection(process.env.DATABASE_URL);
One should need to use pool connection for database connection to handle better mysql conncurrent request as follows
var pool = mysql.createPool({
connectionLimit : 100,
host : 'us-cdbr-iron-east-05.cleardb.net',
user : 'b5837b0f1d3d06',
password : '9d9ae3d5',
database : 'heroku_db89e2842543609',
debug : 'false'
});
It just because pool maintain the connection.release() on its own , so you do not have to bother where you should need to release the connection.
On the other hand you should need to provide user, password and database name as i mentioned in my code.
When u get provisioned from heroku then you get a cleardb database name.
on clicking clear db database button you will find username and password.
and to get database url you have to run the following commands in terminal as follows;
heroku login
heroku app -all (it shows the app list name )
heroku config --app appname (it will provide the database url).
Rest you would need to worry, just add all dependency into your package.json before pushing to heroku master.
After then you will have no problem on deploying nodejs application to heroku server.
Looking at the log timestamps, it seems like your connections are timing out. Either create a wrapper for 'getConnection' that checks the connection health and re-establishes if necessary, or try to use the mysql Connection Pool feature, which can do that for you.