[NFR] Add getSql() to the query builder

[iby]

There are situations when using phql is not the preferred, but using query builder is useful. There seem to be no way of getting native sql out of it. The closest I got to is described in #1905 (comment), however that doesn't cover all scenarios.

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[andresgutierrez]

This is implemented in 2.0.3

<?php

namespace Some;

use Phalcon\DI,
    Phalcon\Db\Column,
    Phalcon\Mvc\Model,
    Phalcon\Events\Manager as EventsManager,
    Phalcon\Db\Adapter\Pdo\MySQL as Connection,
    Phalcon\Mvc\Model\Manager as ModelsManager,
    Phalcon\Mvc\Model\Metadata\Memory as ModelsMetaData;

$eventsManager = new EventsManager();

$di = new DI();

$connection = new Connection(array(
    "host"     => "localhost",
    "username" => "root",
    "password" => "",
    "dbname"   => "phalcon_test",
));

$connection->setEventsManager($eventsManager);

$eventsManager->attach('db',
    function ($event, $connection) {
        switch ($event->getType()) {
            case 'beforeQuery':
                echo $connection->getSqlStatement(), "\n";
                break;
        }
    }
);

$modelsManager = new ModelsManager();
$modelsManager->setDi($di);
$di['db'] = $connection;
$di['modelsManager'] = $modelsManager;
$di['modelsMetadata'] = new ModelsMetadata();

class Robots extends Model
{

}

print_r($modelsManager->createBuilder()
        ->from('Some\Robots')
        ->getQuery()
        ->getSql());