Debugging Joomla! code with JLog

[PGS]

At file: libraries\joomla\database\driver\mysqli.php
At: public function execute() {
After '$query = $this' etc I added:
jimport('joomla.log.log');
JLog::add('query:'.$query);

So that I would be able to see the queries being executed.

But an error was returned:
"Error displaying the error page: Application Instantiation Error: Application Instantiation Error"

Can't I echo (with JLog::Add or enqueMessage or something else?? ) from this function?
Is there some way to overcome this?

[Mark Dexter]

I think you need to first create an instance of JLogger using JLog::addLogger. If you look at how the logging is done in core, you will see something like the following:

$options['format']    = '{DATE}\t{TIME}\t{LEVEL}\t{CODE}\t{MESSAGE}';

$options['text_file'] = 'joomla_update.php';

JLog::addLogger($options, JLog::INFO, array('Update', 'databasequery', 'jerror'));

JLog::add(JText::_('COM_JOOMLAUPDATE_UPDATE_LOG_DELETE_FILES'), JLog::INFO, 'Update');

You only need one instance of the logger and then you can use JLog:add() as many times as you need.

Hope that helps. Mark

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[er...@digital-garage.com.au]

Hey PGS, with JLog::add if you want to also echo the message to the message queue (ie. similar to enqueueMessage) then you need to call JLog::add and pass the category as jerror.

 

The category is the third param so it would be:

 

JLog::add("Some message here",JLog::INFO,"jerror");

 

See docs here: https://docs.joomla.org/Using_JLog

 

In particular this bit:

 

Adding the category of jerror means that this message will also be displayed to users

 

 

Cheers,

Eric.

[PGS]

I tried your suggestions but nothing changed.
I still get the same error: "Error displaying the error page: Application Instantiation Error: Application Instantiation Error" .
Only if I remove line 'JLog::add' the error goes away.