How to debug MySQL/Doctrine2 Queries?

I am using MySQL with Zend Framework & Doctrine 2. I think even if you don't use Doctrine 2, you will be familiar with errors like

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SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ASC' at line 1

The problem is that I don't see the full query. Without an ORM framework, I could probably echo the sql easily, but with a framework, how can I find out what SQL its trying to execute? I narrowed the error down to

$progress = $task->getProgress();

$progress is declared

// Application\Models\Task
/**
 * @OneToMany(targetEntity="TaskProgress", mappedBy="task")
 * @OrderBy({"seq" = "ASC"})
 */
protected $progress;

In MySQL, the task class looks like

CREATE TABLE `tasks` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `owner_id` int(11) DEFAULT NULL,
  `assigned_id` int(11) DEFAULT NULL,
  `list_id` int(11) DEFAULT NULL,
  `name` varchar(60) NOT NULL,
  `seq` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `tasks_owner_id_idx` (`owner_id`),
  KEY `tasks_assigned_id_idx` (`assigned_id`),
  KEY `tasks_list_id_idx` (`list_id`),
  CONSTRAINT `tasks_ibfk_1` FOREIGN KEY (`owner_id`) REFERENCES `users` (`id`),
  CONSTRAINT `tasks_ibfk_2` FOREIGN KEY (`assigned_id`) REFERENCES `users` (`id`),
  CONSTRAINT `tasks_ibfk_3` FOREIGN KEY (`list_id`) REFERENCES `lists` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1$$

Most simple solution for debugging queries in Doctrine 2:

$em->getConnection()
  ->getConfiguration()
  ->setSQLLogger(new \Doctrine\DBAL\Logging\EchoSQLLogger())
;

You have to use a DBAL SQLLogger. You can use the basic native SQL Logger \Doctrine\DBAL\Logging\EchoSQLLogger, or you can implement yours with an interface of Doctrine\DBAL\Logging\SQLLogger.

For the basic logger you must attach the SQL Logger to the EntityManager. So, in your Doctrine bootstrap file use:

$config = new Doctrine\ORM\Configuration ();
// ... config stuff
$config->setSQLLogger(new \Doctrine\DBAL\Logging\EchoSQLLogger());
$connectionParams = array(
        'dbname' => 'example',
        'user' => 'example',
        'password' => 'example',
        'host' => 'localhost',
        'driver' => 'pdo_mysql');
//make the connection through an Array of params ($connectionParams)
$em = EntityManager::create($connectionParams, $config);

Note that we create our EntityManager from the $connectionParams array.

Important:. If you use a DBAL Connection for creating your EntityManager, you have to attach it in both, the DBAL Connection and the ORM EntityManager. For example, in Zend Framework,

You do this:

$config = new Doctrine\ORM\Configuration ();
// ...config stuff
// LOGGER
$config->setSQLLogger(new \Doctrine\DBAL\Logging\EchoSQLLogger());

// make the connection through DBAL (DriverManager::getConnection)
// note that we attach $config in $connApp(DBAL) and $emApp(ORM)
$connApp = DriverManager::getConnection($connectionParams, $config);
$emApp = EntityManager::create($connApp, $config);
Zend_Registry::set('emApp', $emApp);
Zend_Registry::set('connApp', $connApp);

how about using mysql general query log?

The general query log is a general record of what mysqld is doing. The server writes information to this log when clients connect or disconnect, and it logs each SQL statement received from clients. The general query log can be very useful when you suspect an error in a client and want to know exactly what the client sent to mysqld.

Use Doctrine2 profiler + Firebug

https://github.com/mridgway/ZendX_Doctrine2/

I wrote a blog article on this topic with some instructions for setting up profiling Doctrine 2 in Zend Framework

ZFDebug is already very nice, and there is a Doctrine 2 plugin for it

http://labs.ultravioletdesign.co.uk/profiling-doctrine-2-with-zend-framework/

If your developing in ZF2 you can either use the solution above posted by beberlei, though this does echo it out to your display which is not exactly best practice but useful.

$em->getConnection()
  ->getConfiguration()
  ->setSQLLogger(new \Doctrine\DBAL\Logging\EchoSQLLogger())
;

or you could use ZendDeveloperTools which displays the execute query on the toolbar.

Try to use Mysql proxy between you and the MySQL server (http://forge.mysql.com/wiki/MySQL_Proxy). Then you can configure this proxy to log all requests.

http://mysql.stu.edu.tw/tech-resources/articles/proxy-gettingstarted.html

Maybe you should use a Zend_Db_Profile in your [development] environment.

This will log your queries with runtime and other informations.

If you have an error log that logs your exceptions, then everything can be found in your log files.

See this link: Zend Enable SQL Query logging

Also see this Zend Framework Helper: https://github.com/jokkedk/ZFDebug