dbconn.js

const mysql = require('mysql')

var env = process.env.NODE_ENV || 'development';
const config = require('../config/config')[env]

// ==== USER ACOOUNT DB CONNECTION ====
var userConnection = mysql.createConnection({
    host: config.database.host,
    user: config.database.user,
    password: config.database.password,
    port: config.database.port,
    database: config.database.dbUser,
    multipleStatements: true
})

userConnection.connect(function(err) {
    if (err) throw err;
})
userConnection.query('USE '+config.database.dbUser)
    
// user db connection test
userConnection.query('SELECT 1 + 5 AS solution', function (err, rows, fields) {
    if (err) throw err
    console.log('Solution = ', rows[0].solution)
})
//userConnection.end()

// ALTERNATIVE approach: close db connection manually after every query
/*
var dbconn = function dbconn(query, values, next) {
    var connection = mysql.createConnection({
        host: config.database.host,
        user: config.database.user,
        password: config.database.password,
        port: config.database.port,
        database: config.database.db
    })
    connection.connect(function(err) {
        if (err) throw err;
    })
    connection.query(query, values, function(err) {
        connection.end(); // close the connection
        if (err) {
            throw err;
        }
        // Execute the callback
        next.apply(this, arguments);
    });
}
*/

// ==== PROJECT DB CONNECTION ====
var projectConnection = mysql.createConnection({
    host: config.database.host_project,
    user: config.database.user,
    password: config.database.password,
    port: config.database.port,
    database: config.database.dbProject
})

projectConnection.connect(function(err) {
    if (err) throw err;
})
projectConnection.query('USE '+config.database.dbProject)
    
// projectdb connection test
projectConnection.query('SELECT 10 + 5 AS project', function (err, rows, fields) {
    if (err) throw err
    console.log('Project = ', rows[0].project)
})