Codeigniter catch database errors - codeigniter

Question

I'm looking for a way to catch all the database errors (if and when they occur) and sent an error report my email. For regular php error I extended the CI_Exceptions class and added my email sending code in addition to logging. But the database errors don't go trough CI_Exceptions but instead are logged directly from CI_DB_Driver->query() and I don't want to modify any file in the System folder.
Also I don't want to write logging code around every query the app does.

Answer 1

I'd be tempted to extend CI_Exceptions show_error method to catch any errors passed with the 'error_db' template rather than hunting through the db driver.
As you've already extended CI_Exceptions with email code this would seem like the best practice.
function show_error($heading, $message, $template = 'error_general', $status_code = 500)
{
set_status_header($status_code);
$message = '<p>'.implode('</p><p>', ( ! is_array($message)) ? array($message) : $message).'</p>';
if ($template == 'error_db')
{
// do email send here with $message
}
if (ob_get_level() > $this->ob_level + 1)
{
ob_end_flush();
}
ob_start();
include(APPPATH.'errors/'.$template.'.php');
$buffer = ob_get_contents();
ob_end_clean();
return $buffer;
}