sql.js

// From: http://tomasz.janczuk.org/2013/05/multi-line-strings-in-javascript-and.html
function multiline(fn) {
    return fn.toString().match(/[^]*\/\*([^]*)\*\/\}$/)[1].trim();
}

// NOTE: exported objects are Strings, not functions
exports.getTour = multiline(function() {/*
    SELECT
        *
    FROM
        tour
    WHERE
        id = ?
*/});

// To use:

var sql = require(‘./sql’);
var connection = mysql.createConnection(…);
connection.query(sql.getTour, [tourId], function(err, rows) {…});