[fw-mvc] Setting Database Adapter form Bootsrap class

Can anyone help me to set the database adapter form Bootstrap class.

This is my Bootstrap class.
http://www.nabble.com/file/p25185540/Bootstrap.php Bootstrap.php

I used
http://blog.keppens.biz/2009/06/create-modular-application-with-zend.html
keppens's create modular application Tutorial.

I add this code to boot

protected function _initDb(){
$params=array('host'=>'localhost',
'username'=>'root',
'password'=>'',
'dbname'=>'mydb');
$db=Zend_Db::factory('PDO_MYSQL',$params);
Zend_Db_Table::setDefaultAdapter($db);
}

Is this wrong ? What do I want to do?

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