1. find方法：
2. findFirst方法，将返回 Phalcon\Mvc\Model\Criteria 对象
3. Criteria方法 模型的query() 将返回 Phalcon\Mvc\Model\Criteria 对象

$robots = Robots::query()     ->where('type = :type:')     ->andWhere('year < 2000')     ->bind(['type' => 'mechanical'])     ->limit(5, 10)     ->orderBy('name')     ->execute();

4. PHQL

5. Buider 是PHQL中的子功能

use Phalcon\Mvc\Model\Manager as ModelsManager; $builder = $this->modelsManager->createBuilder()                 ->columns('id, name')                 ->from('Robots')                 ->orderBy('name'); // Getting a whole set $robots = $this->modelsManager->createBuilder()    ->from("Robots")    ->join("RobotsParts")    ->orderBy("Robots.name")    ->getQuery()    ->execute(); // Getting the first row $robots = $this->modelsManager->createBuilder()    ->from("Robots")    ->join("RobotsParts")    ->orderBy("Robots.name")    ->getQuery()    ->getSingleResult();