update to init db if empty

db_connection.php

@@ -1,16 +1,60 @@
 <?php
-$databaseFile = 'rippchen.db'; // Path to your SQLite database file
+$databaseFile = 'mydatabase.db';
 
 try {
     $db = new PDO("sqlite:" . $databaseFile);
     $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+    // Check if the User table exists
+    $result = $db->query("SELECT name FROM sqlite_master WHERE type='table' AND name='User'");
+    $userTableExists = $result->fetchColumn();
+
+    if (!$userTableExists) {
+        // Initialize the database structure
+        $db->exec("
+            CREATE TABLE User (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                vorname TEXT NOT NULL,
+                nachname TEXT NOT NULL,
+                username TEXT UNIQUE NOT NULL,
+                password TEXT NOT NULL
+            )
+        ");
+
+        $db->exec("
+            CREATE TABLE Restaurant (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                name TEXT NOT NULL,
+                maps_link TEXT
+            )
+        ");
+
+        $db->exec("
+            CREATE TABLE Bewertung (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                fk_user_id INTEGER NOT NULL,
+                fk_restaurant_id INTEGER NOT NULL,
+                bewertung INTEGER NOT NULL CHECK (bewertung BETWEEN 0 AND 10),
+                bewertung_str TEXT,
+                FOREIGN KEY (fk_user_id) REFERENCES User(id),
+                FOREIGN KEY (fk_restaurant_id) REFERENCES Restaurant(id)
+            )
+        ");
+
+        echo "<p style='color:green;'>Database initialized successfully!</p>";
+    } else {
+        // Optionally, you can add a message indicating the database already exists
+        // echo "<p style='color:blue;'>Database already exists.</p>";
+    }
+
 } catch (PDOException $e) {
     die("Database connection failed: " . $e->getMessage());
 }
 
-// Function to sanitize user input (remains the same)
 function sanitize_input($data) {
     $data = trim($data);
     $data = stripslashes($data);
-    return htmlspecialchars($data);
+    $data = htmlspecialchars($data);
+    return $data;
 }
+?>