MySQL with Node.js

Question

I've just started getting into Node.js. I come from a PHP background, so I'm fairly used to using MySQL for all my database needs.

How can I use MySQL with Node.js?

Answer 1

You can also try out a newer effort known as Node.js DB that aims to provide a common framework for several database engines. It is built with C++ so performance is guaranteed.

Specifically you could use its db-mysql driver for Node.js MySQL support.

Answer 2

Here is production code which may help you.

Package.json

{
  "name": "node-mysql",
  "version": "0.0.1",
  "dependencies": {
    "express": "^4.10.6",
    "mysql": "^2.5.4"
  }
}

Here is Server file.

var express   =    require("express");
var mysql     =    require('mysql');
var app       =    express();

var pool      =    mysql.createPool({
    connectionLimit : 100, //important
    host     : 'localhost',
    user     : 'root',
    password : '',
    database : 'address_book',
    debug    :  false
});

function handle_database(req,res) {

    pool.getConnection(function(err,connection){
        if (err) {
          connection.release();
          res.json({"code" : 100, "status" : "Error in connection database"});
          return;
        }   

        console.log('connected as id ' + connection.threadId);

        connection.query("select * from user",function(err,rows){
            connection.release();
            if(!err) {
                res.json(rows);
            }           
        });

        connection.on('error', function(err) {      
              res.json({"code" : 100, "status" : "Error in connection database"});
              return;     
        });
  });
}

app.get("/",function(req,res){-
        handle_database(req,res);
});

app.listen(3000);

Reference : https://codeforgeek.com/2015/01/nodejs-mysql-tutorial/

Answer 3

Since this is an old thread just adding an update:

To install the MySQL node.js driver:

If you run just npm install mysql, you need to be in the same directory that your run your server. I would advise to do it as in one of the following examples:

For global installation:

npm install -g mysql

For local installation:

1- Add it to your package.json in the dependencies:

"dependencies": {
    "mysql": "~2.3.2",
     ...

2- run npm install

---

Note that for connections to happen you will also need to be running the mysql server (which is node independent)

To install MySQL server:

There are a bunch of tutorials out there that explain this, and it is a bit dependent on operative system. Just go to google and search for how to install mysql server [Ubuntu|MacOSX|Windows]. But in a sentence: you have to go to http://www.mysql.com/downloads/ and install it.

Answer 4

connect the mysql database by installing a library. here, picked the stable and easy to use node-mysql module.

npm install mysql@2.0.0-alpha2

var http = require('http'),
   mysql = require('mysql');

var sqlInfo = {
   host: 'localhost',
   user: 'root',
   password: 'urpass',
   database: 'dbname'
}
client = mysql.createConnection(sqlInfo);

client.connect();

For NodeJS mysql connecting and querying example

Answer 5

KnexJs can be used as an SQL query builder in both Node.JS and the browser. I find it easy to use. Let try it - Knex.js

$ npm install knex --save
# Then add one of the following (adding a --save) flag:
$ npm install pg
$ npm install sqlite3
$ npm install mysql
$ npm install mysql2
$ npm install mariasql
$ npm install strong-oracle
$ npm install oracle
$ npm install mssql


var knex = require('knex')({
  client: 'mysql',
  connection: {
    host : '127.0.0.1',
    user : 'your_database_user',
    password : 'your_database_password',
    database : 'myapp_test'
  }
});

You can use it like this

knex.select('*').from('users')

or

knex('users').where({
  first_name: 'Test',
  last_name:  'User'
}).select('id')

Answer 6

var express = require('express');
var router = express.Router();

/* GET home page. */

var mysql = require('mysql');
var con = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "****",
    database: "nodejs"
});

con.connect(function(err) {
    if (err) throw err;
    console.log("Connected!");
});
module.exports = con;