Track data changes on tables using doctrine - mysql

Question

So the situation is that I am using Doctrine as the ORM for one of my projects.
Now I want to be able to track the changes happening on certain tables of my website without having to much extra coding for that.
For eg. I have a database which has many tables. out of that i have a table users on which I want to track the changes done
1. users has column name with value 'Raman'
2. Using update sql below i modify the row
update users set name = 'Raman Joshi' where name='Raman'
Is there any in built feature in doctrine that allows to create a log table tracking all the data level changes log that was done?

Answer 1

You can use a Doctrine preUpdate event listener to do this. Here's a simple example that will send changes to a logger:
use Psr\Log\LoggerInterface as Logger;
use Doctrine\ORM\Event\PreUpdateEventArgs;
class ChangeLoggerListener
{
protected $logger;
public function __construct(Logger $logger)
{
$this->logger = $logger;
}
public function preUpdate(PreUpdateEventArgs $eventArgs)
{
//find out class and id of object being updated
$obj=$eventArgs->getEntity();
$class=get_class($eventArgs->getEntity());
$id=$obj->getId();
$log="$class($id) updated: ";
//find out what has changed...
$changes=$eventArgs->getEntityChangeSet();
$separator='';
foreach ($changes as $field => $values) {
$log.=$separator."$field changed from {$values[0]} to {$values[1]}";
$separator=", ";
}
//send it to logger
$this->logger->info($log);
}
}
The manual page shows how to register the listener, but if you're using Symfony, you can register the listener as a service with this in your services.yml
my.change_logger:
class: My\ExampleBundle\Listener\ChangeLoggerListener
arguments: [#logger]
tags:
- { name: doctrine.event_listener, event: preUpdate }