CodeIgniter how to connect multi database using database.php for first connection and Model for second connection

[eluser]dev.bashar[/eluser]
Hello

I have many database connection
i have primary connection in the database.php file


$active_group = 'default';
$active_record = TRUE;

Code:

$db['default']['hostname'] = 'xxx';
$db['default']['username'] = 'xxx';
$db['default']['password'] = 'xxxx';
$db['default']['database'] = 'xxx';
$db['default']['dbdriver'] = 'mysql';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

and i have many more connections ..
but i must to config another connections using Model

can i pass parameters to database.php?

or can i put like this code in Model

Code:

$db['xxx']['hostname'] = 'xxx';
$db['xxx']['username'] = 'xxx';
$db['xxx']['password'] = 'xxxx';
$db['xxx']['database'] = 'xxx';
$db['xxx']['dbdriver'] = 'mysql';
$db['xxx']['dbprefix'] = '';
$db['xxx']['pconnect'] = TRUE;
$db['xxx']['db_debug'] = TRUE;
$db['xxx']['cache_on'] = FALSE;
$db['xxx']['cachedir'] = '';
$db['xxx']['char_set'] = 'utf8';
$db['xxx']['dbcollat'] = 'utf8_general_ci';
$db['xxx']['swap_pre'] = '';
$db['xxx']['autoinit'] = TRUE;
$db['xxx']['stricton'] = FALSE;

$this->load->database('xxx', TRUE);