internship-playground/src-php/app/internship/model/ArticleDao.php

<?php
namespace internship\model;

use n2n\persistence\orm\EntityManager;
use internship\bo\Article;
use internship\bo\Category;
use n2n\context\attribute\RequestScoped;

/**
 * Benutze diese Klasse, um Datenbankabfragen auszuführen.
 * Du findest alle Informationen zu Datenbankabfragen in der Doku:
 * https://dev.n2n.rocks/de/n2n/docs/persistence-orm#entitymanager
 */
#[RequestScoped]
class ArticleDao {
	private EntityManager $em;

	private function _init(EntityManager $em): void {
		$this->em = $em;
	}

	/**
	 * Gebe alle {@see Article}-Objekte, nach id absteigend sortiert, zurück.
	 *
	 * @return Article[]
	 */
	function getArticles(): array {
        $criteria = $this->em->createNqlCriteria(
                'SELECT a FROM Article a ORDER BY a.id DESC');
        return $criteria->toQuery()->fetchArray();
	}

    /**
     * Gebe den {@see Article} mit der enstprechenden ID zurück.
     *
     * @param int $id
     * @return Article|null
     */
    function getArticleById(int $id): ?Article {
        return $this->em->find(Article::getClass(),$id);
    }

    /**
     * Gebe alle {@see Article} zurück, welche der übergebenen {@see Category} entsprechen.
     *
     * @param Category $category
     * @return array
     */
	function getArticlesByCategoryName(string $categoryName): array {
//        $criteria = $this->em->createSimpleCriteria(Article::getClass(),
//              ['categoryName' => $categoryName]);
//        return $criteria->toQuery()->fetchArray();

//        $criteria = $this->em->createNqlCriteria(
//                'SELECT a FROM Article a WHERE a.categoryName = :category',
//                array('category' => $category));

        $criteria = $this->em->createCriteria();
        $criteria->select('a')
            ->from(Article::getClass(),'a')
            ->where(['a.category.name' => $categoryName]);
        return $criteria->toQuery()->fetchArray();
	}

    /**
     * Speichere den {@see Article} in der Datenbank.
     *
     * @param Article $article
     * @return void
     */
    function saveArticle(Article $article): void {
        $this->em->persist($article);
    }

    /**
     * Lösche den {@see Article} aus der Datenbank.
     *
     * @param Article $article
     * @return void
     */
    function removeArticle(Article $article): void {
        $this->em->remove($article);
    }
}