CodeIgniter: How to know if $this->load->database(); did connect?

If I configure my CI application to use database for session handling, if a session userdata returns false, I can assume that the user's session has expired.

But开发者_运维百科 what if the actual reason that it returned false was because the database connection was not established successfully?

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By default CodeIgniter will fatal error if the database is loaded and cannot connect, but if you have:

$db['local']['db_debug'] = FALSE;

then it won't tell you. You can turn debugging off in general but still react to a failed load by doing this:

if ( $this->load->database() === FALSE )
{
   exit('THE END IS NIGH!');
}

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I test all I found and nothing wokrs, the only way I found was with dbutil checking if database exists.

$this->load->database();
$this->load->dbutil();

// check connection details
if( !$this->dbutil->database_exists('myDatabase'))
    echo 'Not connected to a database, or database not exists';

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CI throws

A Database Error Occurred
Unable to connect to your database server using the provided settings.

or something similar on connection failure