Question

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

    $database = Zend_Db::factory('PDO_MYSQL', $params);
    $database->getConnection();
    return $database;
}

.

class App_Controller_Plugin_Test extends Zend_Controller_Plugin_Abstract
{
    public function preDispatch(Zend_Controller_Request_Http $request)
    {
        // how i get database?

    }
}

Answer 1

You can always get a reference to the front controller:

$front = Zend_Controller_Front::getInstance();

From that you can get the bootstrap:

$bootstrap = $front->getParam("bootstrap");

From the bootstrap you can get bootstrap plugins:

if ($bootstrap->hasPluginResource("database")) {
      $dbResource = $bootstrap->getPluginResource("database");
}
$db = $dbResource->getDatabase();

But that’s a lot of extra plumbing!

Honestly, you’d be better off storing the database adapter object in the registry during your bootstrap:

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

    $database = Zend_Db::factory('PDO_MYSQL', $params);
    $database->getConnection();
    Zend_Registry::set("database", $database);
    return $database;
}

Then you can get the database adapter anywhere:

Zend_Registry::get("database");

See also my answer to What is the “right” Way to Provide a Zend Application With a Database Handler