con.query('SELECT * FROM country ',function(err,rows){
    if(err) throw err;
        console.log('Data received from Db:n');
        console.log(rows);
     });

GET http://localhost:3000/item/create 500 (Internal Server Error)

var con = mysql.createConnection({
    host: "127.0.0.1",
    port: "3306",
    user: "root",
    password: "",
    database: "myDataBase",
});

var con = mysql.createConnection({
        host     : MYSQL_DB_HOST,
        user     : MYSQL_DB_USER,
        password : MYSQL_DB_PWD,
        database : MYSQL_DB_NAME
});

con.connect(function(err) {
    if(err) {
        console.log('con : error when connecting to db : ', err);
        setTimeout(/*create again */, 2000);
    }
    else {
        console.log('Connected ');
    }
});

con.on('error', function(err) {
    console.log('con : db error : ', err);
    if(err.code === 'PROTOCOL_CONNECTION_LOST') {
        //Create Again
    }
    else {
        throw err;
    }
});