Postgresql error in try block

Hello,
In codeigniter 3.1 / postgresql 9.4 application in development mode
running code like :

PHP Code:

try { 
$updated_result= $this->msettings->updateSettings( $updateDataArray ) ;
echo '<pre>++ $updated_result::'.print_r($updated_result,true).'</pre>'; 
} catch (Exception $e) { 
echo 'Caught exception: ', $e->getMessage(), "\n";
echo '<pre>INSIDE</pre>'; 
} 


If inside of updateSettings there is calling of nonexisting postgresql function like :

Code:

select * from pd_update_settings_no_exists( 'price_list_items_per_page', '200' )

pg_query raise error on screen:

Code:

Message: pg_query(): Query failed: ERROR: function pd_update_settings_no_exists(unknown, unknown) does not exist

That is ok, but I would like to catch this error and as example to show it as some error page, but not system error.
From my code at top

Code:

$updated_result::

line is on screen, but not code inside of

Code:

} catch (Exception $e) {

but I would like this code to be run for some my rendering...
Which is the right way here?
Thanks!