Update

2019-07-04 08:13:20 +02:00
parent 39a14ad5a2
commit 54e8654512
8 changed files with 306 additions and 0 deletions
--- a/uebung9/uebung09-examples/to-do-list-database/inc/Database.php
+++ b/uebung9/uebung09-examples/to-do-list-database/inc/Database.php
@@ -0,0 +1,95 @@
+<?php
+
+
+class Database
+{
+
+    private $connection;
+
+    /**
+     * Database constructor.
+     *
+     * Baut die Verbindung zur Datenbank auf
+     */
+    public function __construct()
+    {
+        // MySQL-Zugangsdaten
+        // Hier: Automatisch auslesen aus .my.cnf. Sonst einfach von Hand eintragen
+        $user = get_current_user(); // Benutzer, dem diese Datei gehört!
+        $myCnf = parse_ini_file("/home/$user/.my.cnf");
+
+        $host = $myCnf['host'];
+        $user = $myCnf['user'];
+        $password = $myCnf['password'];
+        $database = $myCnf['database'];
+
+        $this->connection = new mysqli($host, $user, $password, $database);
+    }
+
+    /**
+     * Schließt die Verbindung zru Datenbank
+     */
+    public function __destruct()
+    {
+        $this->connection->close();
+    }
+
+
+    /**
+     * Löscht die Tabelle tasks und erstelle sie anschließend erneut
+     */
+    public function reset()
+    {
+        $this->connection->query("DROP TABLE IF EXISTS tasks");
+        $this->connection->query("CREATE TABLE tasks(id INT NOT NULL AUTO_INCREMENT, name TEXT, PRIMARY KEY (id));");
+    }
+
+
+    /**
+     * Fügt einen Task mit dem Namen $name in die Tabelle tasks ein
+     *
+     * @param string $name
+     * @return bool true, falls Einfügen erfolgreich
+     */
+    public function addTask($name)
+    {
+        $statement = $this->connection->prepare("INSERT INTO tasks(name) VALUES(?)");
+        $statement->bind_param("s", $name);
+        return $statement->execute();
+    }
+
+    /**
+     * Löscht den Taks mit der ID $id aus der Tabelle tasks
+     *
+     * @param int $id
+     * @return bool, falls Löschen erfolgreich
+     */
+    public function deleteTask($id)
+    {
+        $statement = $this->connection->prepare("DELETE FROM tasks WHERE id = ?");
+        $statement->bind_param("i", $id);
+        return $statement->execute();
+    }
+
+    /**
+     * Liefert ein assozaitves Array aller in der Tabelle tasks gespeicherten Einträge
+     *
+     * @return array
+     */
+    public function getTasks()
+    {
+        $result = $this->connection->query("SELECT * FROM tasks");
+
+        $resultArray = [];
+
+        while ($line = $result->fetch_assoc()) {
+            array_push($resultArray, $line);
+        }
+
+        $result->free();
+
+        return $resultArray;
+    }
+
+
+}
--- a/uebung9/uebung09-examples/to-do-list-database/index.php
+++ b/uebung9/uebung09-examples/to-do-list-database/index.php
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+    <meta charset="utf-8">
+    <title>Meine Todo-Liste</title>
+    <link rel="stylesheet" href="style.css">
+</head>
+<body>
+
+<h1>Todo-Liste</h1>
+
+
+<?php
+
+require_once(__DIR__ . "/inc/Database.php");
+
+$db = new Database();
+
+$tasks = $db->getTasks();
+
+if (sizeof($tasks) > 0) {
+    echo "<ul>";
+
+    foreach ($tasks as $task) {
+
+        $name = $task['name'];
+        $id = $task['id'];
+
+
+        echo "<li>$name <form action='tasks-delete.php' method='post' class='inline-form'><button name='id' value='$id'>löschen</button></form> </li>";
+    }
+
+    echo "</ul>";
+} else {
+    echo "Nichts zu tun";
+}
+
+?>
+
+
+<hr>
+
+
+<form action="tasks-store.php" method="post">
+
+    <label for="task">Todo:</label>
+    <input name="name" type="text" id="task">
+
+    <button type="submit">Hinzufügen</button>
+
+</form>
+
+<p><a href="reset.php">Liste zurücksetzen</a></p>
+
+
+</body>
+</html>
--- a/uebung9/uebung09-examples/to-do-list-database/reset.php
+++ b/uebung9/uebung09-examples/to-do-list-database/reset.php
@@ -0,0 +1,7 @@
+<?php
+require_once(__DIR__ . "/inc/Database.php");
+
+$db = new Database();
+$db->reset();
+
+header("Location: index.php");
--- a/uebung9/uebung09-examples/to-do-list-database/style.css
+++ b/uebung9/uebung09-examples/to-do-list-database/style.css
@@ -0,0 +1,24 @@
+body {
+    font-family: sans-serif;
+    text-align: center;
+    background-color: #eeeeee;
+}
+
+.inline-form {
+    display: inline;
+}
+
+.inline-form button {
+    border: 0;
+    background-color: #c6c8ca;
+    border-radius: 1em;
+    font-size: x-small;
+    padding: 0.3em;
+}
+
+.inline-form button:hover {
+    background-color: red;
+    color: white;
+    cursor: pointer;
+}
+
--- a/uebung9/uebung09-examples/to-do-list-database/tasks-delete.php
+++ b/uebung9/uebung09-examples/to-do-list-database/tasks-delete.php
@@ -0,0 +1,9 @@
+<?php
+require_once(__DIR__ . "/inc/Database.php");
+
+$id = $_POST['id'];
+
+$db = new Database();
+$db->deleteTask($id);
+
+header("Location: index.php");
--- a/uebung9/uebung09-examples/to-do-list-database/tasks-store.php
+++ b/uebung9/uebung09-examples/to-do-list-database/tasks-store.php
@@ -0,0 +1,14 @@
+<?php
+require_once(__DIR__ . "/inc/Database.php");
+
+$name = $_POST['name'];
+
+// Nur nicht leere Tasks sollen gespeichert werden
+if (!empty($name) && !empty(trim($name))) {
+
+    $db = new Database();
+    $db->addTask($name);
+}
+
+
+header("Location: index.php");