Fehlerbehebung

2026-06-16 00:02:06 +02:00
parent f4f6960b9d
commit 47239016c5
1 changed files with 245 additions and 56 deletions
@@ -1,3 +1,184 @@
+<?php
+
+require_once "CommentManagerDAO.php";
+require_once "Comment.php";
+
+/**
+ * Verwaltet die Speicherung und das Laden von Kommentaren
+ * über eine SQLite-Datenbank.
+ *
+ * @author Caroline Schulte
+ */
+class DatabaseCommentManager implements CommentManagerDAO
+{
+    private static $instance = null;
+
+    /**
+     * Erstellt die Kommentartabelle, falls diese noch nicht existiert.
+     */
+    public function __construct()
+    {
+        try {
+            $db = $this->getConnection();
+
+            $db->exec("
+                CREATE TABLE IF NOT EXISTS comments (
+                    id INTEGER PRIMARY KEY AUTOINCREMENT,
+                    article_id INTEGER NOT NULL,
+                    parent_comment_id INTEGER NULL,
+                    author TEXT NOT NULL,
+                    content TEXT NOT NULL,
+                    created TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+                );
+            ");
+
+            $columns = $db->query("PRAGMA table_info(comments);")->fetchAll(PDO::FETCH_ASSOC);
+            $hasParentColumn = false;
+
+            foreach ($columns as $column) {
+                if ($column["name"] === "parent_comment_id") {
+                    $hasParentColumn = true;
+                    break;
+                }
+            }
+
+            if (!$hasParentColumn) {
+                $db->exec("ALTER TABLE comments ADD COLUMN parent_comment_id INTEGER NULL;");
+            }
+
+        } catch (PDOException $e) {
+            throw new RuntimeException("Kommentardatenbank konnte nicht erstellt werden.");
+        }
+    }
+
+    /**
+     * Baut die Verbindung zur SQLite-Datenbank auf.
+     *
+     * @return PDO Datenbankverbindung
+     */
+    private function getConnection()
+    {
+        try {
+            $dsn = 'sqlite:' . __DIR__ . '/../../db/comments.db';
+
+            $db = new PDO($dsn, null, null);
+            $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+            return $db;
+
+        } catch (PDOException $e) {
+            throw new RuntimeException("Verbindung zur Kommentardatenbank fehlgeschlagen.");
+        }
+    }
+
+    /**
+     * Gibt die Singleton-Instanz zurück.
+     *
+     * @return DatabaseCommentManager
+     */
+    public static function getInstance()
+    {
+        if (self::$instance === null) {
+            self::$instance = new DatabaseCommentManager();
+        }
+
+        return self::$instance;
+    }
+
+    /**
+     * Speichert einen neuen Kommentar oder eine Antwort.
+     *
+     * @param int $articleId ID des Beitrags
+     * @param string $author Autor des Kommentars
+     * @param string $content Inhalt des Kommentars
+     * @param int|null $parentCommentId ID des Eltern-Kommentars oder null
+     *
+     * @return int ID des neu gespeicherten Kommentars
+     */
+    public function addComment(
+        $articleId,
+        $author,
+        $content,
+        $parentCommentId = null
+    ) {
+        try {
+            $db = $this->getConnection();
+
+            if ($parentCommentId === "" || $parentCommentId === 0 || $parentCommentId === "0") {
+                $parentCommentId = null;
+            }
+
+            $sql = "
+                INSERT INTO comments (
+                    article_id,
+                    parent_comment_id,
+                    author,
+                    content
+                )
+                VALUES (
+                    :articleId,
+                    :parentCommentId,
+                    :author,
+                    :content
+                )
+            ";
+
+            $command = $db->prepare($sql);
+
+            $command->execute([
+                ":articleId" => $articleId,
+                ":parentCommentId" => $parentCommentId,
+                ":author" => $author,
+                ":content" => $content
+            ]);
+
+            return intval($db->lastInsertId());
+
+        } catch (PDOException $e) {
+            throw new RuntimeException("Kommentar konnte nicht gespeichert werden.");
+        }
+    }
+
+    /**
+     * Lädt alle Kommentare eines Beitrags.
+     *
+     * @param int $articleId ID des Beitrags
+     *
+     * @return Comment[]
+     */
+    public function getCommentsByArticle($articleId)
+    {
+        try {
+            $db = $this->getConnection();
+
+            $sql = "
+                SELECT
+                    id,
+                    article_id,
+                    CASE
+                        WHEN parent_comment_id IS NULL THEN NULL
+                        WHEN parent_comment_id = '' THEN NULL
+                        WHEN parent_comment_id = 0 THEN NULL
+                        ELSE parent_comment_id
+                    END AS parent_comment_id,
+                    author,
+                    content,
+                    created
+                FROM comments
+                WHERE article_id = :articleId
+                ORDER BY created ASC
+            ";
+
+            $command = $db->prepare($sql);
+            $command->execute([":articleId" => $articleId]);
+
+            return $this->mapRowsToComments($command);
+
+        } catch (PDOException $e) {
+            throw new RuntimeException("Kommentare konnten nicht geladen werden.");
+        }
+    }
+
    /**
     * Lädt alle Kommentare eines Autors.
     *
@@ -29,11 +210,24 @@ ORDER BY created DESC
            ";

            $command = $db->prepare($sql);
+            $command->execute([":author" => $author]);

-$command->execute([
-":author" => $author
-]);
+            return $this->mapRowsToComments($command);

+        } catch (PDOException $e) {
+            throw new RuntimeException("Kommentare konnten nicht geladen werden.");
+        }
+    }
+
+    /**
+     * Wandelt Datenbankzeilen in Comment-Objekte um.
+     *
+     * @param PDOStatement $command Ausgeführtes Statement
+     *
+     * @return Comment[]
+     */
+    private function mapRowsToComments($command)
+    {
        $comments = [];

        while ($row = $command->fetch(PDO::FETCH_ASSOC)) {
@@ -59,10 +253,5 @@ $row["created"]
        }

        return $comments;
-
-} catch (PDOException $e) {
-throw new RuntimeException(
-"Kommentare konnten nicht geladen werden."
-);
    }
 }