Li3 database queries logger

queries_logger.php

<?php

use lithium\analysis\Logger;
use lithium\data\Connections;
use lithium\core\Environment;
use lithium\action\Dispatcher;


/**
 * This filter intercepts the `run()` method of the `Dispatcher` 
 * and apply filters to `read()` method of the `Connection` to log in a file,
 * all the queries passed to the database.
 *
 * @see lithium\core\Environment
 * @see lithium\data\Connections
 * @see lithium\analysis\Logger
 */

Logger::config(array(
	'default' => array(
		'production' => array(
			'adapter' => 'File',
			'file' => function($data, $config) { return "{$data['priority']}.prod.log"; }
		)
)));

Dispatcher::applyFilter('run', function($self, $params, $chain) {

	if (Environment::is('production')) {

		Connections::get('default')->applyFilter('read', function($self, $params, $chain) {
			$query = $params['query'];
			Logger::debug('Read:   ' . $query->source() . ': ' . json_encode($query->conditions()));

			return $chain->next($self, $params, $chain);
		});

	}

	return $chain->next($self, $params, $chain);
});

?>

I tried putting this file in
/lithium/analysis/QueriesLogger.php

and included in my ImportController.php
use lithium\analysis\QueriesLogger;

It did not show any output on the page.

You should put this code in a file in config/bootstrap directory of your app, then load it in config/bootstrap.php by requiring it (just like other bootstrap files). It will load those filters during Lithium bootsrap