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

<?php
namespace internship\model;

use n2n\persistence\orm\EntityManager;
use internship\bo\Article;
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->createSimpleCriteria(Article::class,
                null,
                array('id' => 'DESC'));
        return $criteria->toQuery()->fetchArray();
	}

	/**
	 * Gebe alle {@see Article} zurück, welche dem übergebenen Kategorienamen entsprechen.
	 *
	 * @return array
	 */
	function getArticlesByCategoryName(string $categoryName): array {
        $criteria = $this->em->createSimpleCriteria(Article::class,
                array('categoryName' => $categoryName),
                array('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::class, $id);
	}

    function saveArticle(Article $article) {
        $this->em->persist($article);
    }

    function removeArticle(int $articleId) {
        $this->em->remove($this->getArticleById($articleId));
    }
}