如何在Zend Framework的控制器插件中获取引导资源

protected function _initDatabase()
{
     $params = array(
            'host'     => '',
            'username' => '',
            'password' => '',
            'dbname'   => '',
        );

    $database = Zend_Db::factory('PDO_MYSQL', $params);
    $database->getConnection();
    return $database;
}
protected function _initDatabase()
{
     $para