db_crap.js

var mysql = require('mysql');

var dbConfig = {
  host: '',
  user: '',
  pwd: '',
  db: ''
};

pool = mysql.createPool({
  host     : dbConfig.host,
  user     : dbConfig.user,
  password : dbConfig.pwd,
  database : dbConfig.db
});

exports.query = function () {
  var args  = arguments;
  pool.getConnection(function(err, conn){
    args.forEach(function (argument, index) {
      if (typeof argument === 'function') {
        args[index] = function () {
          argument(arguments);
          conn.release();
        };
      }
    });
    
    conn.query.apply(conn, args);
  });
}