How to use and connect alternative database config when it's failed to connect to DB?

Hi all,
My Question is How to use and connect alternative database config when
it's failed to connect to DB?

Based on my question above, just give you the idea that on traditional
php programming, we can do like this :

$db_configs=array(

0=>array('host'=>'localhost1','user'=>'root1','password'=>'password1'),

1=>array('host'=>'localhost2','user'=>'root2','password2'=>'password2')
);

foreach($db_configs as $db_config)
{
if(!mysql_connect($db_config['host'],$db_config['user'],
$db_config['password'])
{
// DB Connection Failed, do nothing and try next db config...
}
else
{
echo 'DB Connection Success, Break';
break;
}
}

So the idea is, the script try to reconnect to database when it's
failed and using alternative config variable.

How can we do like that on CakePHP ?

Thank you.

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