<?php
//app/config/config.php
return new \Phalcon\Config(array(
    'database' => array(
        'adapter'  => 'Mysql',
        'host'     => '127.0.0.1',
        'username' => 'root',
        'password' => 'root',
        'dbname'   => 'taobao',
        'prefix'   => 'sh_',
    ),
));
//app/config/services.php
$di->set('db', function () use ($config) {
    return new DbAdapter(array(
        'host' => $config->database->host,
        'username' => $config->database->username,
        'password' => $config->database->password,
        'dbname' => $config->database->dbname,
        'prefix' => $config->database->prefix
    ));
});
How can I get the 'prefix' params in Model ?