Zend - MultiDb

<?php
/*
; config.ini
resources.multidb.db1.adapter   = "MYSQLI"
resources.multidb.db1.host  = "localhost"
resources.multidb.db1.username  = "username"
resources.multidb.db1.password  = "password"

resources.multidb.db2.adapter   = "PDO_MYSQL"
resources.multidb.db2.host  = "localhost"
resources.multidb.db2.username  = "other_username"
resources.multidb.db2.password  = "other_password"
*/

// Bootstrap.php
protected function _initDbConfig()
{
        $this->bootstrap('multidb');
    $resource = $this->getPluginResource('multidb');
    Zend_Registry::set("multidb", $resource);
    Zend_Registry::set("db1",     $resource->getDb('db1'));
    Zend_Registry::set("db2",     $resource->getDb('db2'));
}