begin implementing database. Down migrate doesnt work yet

src-tauri/Cargo.toml

@@ -23,3 +23,7 @@ tauri-plugin-opener = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 
+# SQLx und Tokio für asynchrone DB-Zugriffe
+sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "sqlite", "macros", "migrate"] }
+tokio = { version = "1", features = ["full"] }
+

src-tauri/migrations/0001_path_node_table.sql

@@ -0,0 +1,8 @@
+-- migrate:up
+CREATE TABLE PathNode (
+    id integer primary key,
+    title text,
+    description text
+)
+
+-- migrate:down

src-tauri/migrations/0002_node_exercise.sql

@@ -0,0 +1,8 @@
+-- migrate:up
+create table NodeExercise (
+    id integer primary key,
+    ex_type text,
+    content text
+)
+
+-- migrate:down

src-tauri/src/lib.rs

@@ -1,14 +1,50 @@
 // Learn more about Tauri commands at https://tauri.app/develop/calling-rust/
+use sqlx::sqlite::{self, SqlitePool};
+
 #[tauri::command]
 fn greet(name: &str) -> String {
     format!("Hello, {}! You've been greeted from Rust!", name)
 }
 
+// Beispiel: SQLite-Version abfragen
+#[tauri::command]
+async fn db_version(app_handle: tauri::AppHandle) -> Result<String, String> {
+    use tauri::Manager;
+    let base_dir = app_handle.path().app_data_dir().map_err(|e| format!("Konnte AppData-Verzeichnis nicht bestimmen: {}", e))?;
+
+    let db_path = base_dir.join("paths.sqlite");
+    println!("{:?}", db_path.to_str());
+
+    if let Some(parent) = db_path.parent() {
+        std::fs::create_dir_all(parent).map_err(|e| format!("Konnte Datenbankverzeichnis nicht erstellen: {}", e))?;
+    }
+
+    let db_opts = sqlite::SqliteConnectOptions::new()
+        .filename(&db_path)
+        .create_if_missing(true);
+
+    let pool = SqlitePool::connect_with(db_opts)
+        .await
+        .map_err(|e| e.to_string())?;
+
+    sqlx::migrate!("./migrations").run(&pool).await.map_err(|e| e.to_string())?;
+
+    let row: (String,) = sqlx::query_as("SELECT sqlite_version()")
+        .fetch_one(&pool)
+        .await
+        .map_err(|e| e.to_string())?;
+    Ok(row.0)
+}
+
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_opener::init())
-        .invoke_handler(tauri::generate_handler![greet])
+        .invoke_handler(tauri::generate_handler![greet, db_version])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
 }
+
+// Hinweis: Für produktive Nutzung sollte der Pool als State eingebunden werden,
+// damit er nicht bei jedem Aufruf neu erstellt wird. Siehe Tauri-Doku:
+// https://tauri.app/v1/guides/features/state/

src/App.vue

@@ -1,160 +1,38 @@
 <script setup lang="ts">
-import { ref } from "vue";
-import { invoke } from "@tauri-apps/api/core";
 
-const greetMsg = ref("");
+import { ref } from '@vue/reactivity';
-const name = ref("");
+// @ts-ignore
+import { invoke } from '@tauri-apps/api/core';
 
-async function greet() {
+const dbVersion = ref<string | null>(null);
-  // Learn more about Tauri commands at https://tauri.app/develop/calling-rust/
+const loading = ref(false);
-  greetMsg.value = await invoke("greet", { name: name.value });
+const error = ref<string | null>(null);
+
+async function fetchDbVersion() {
+	loading.value = true;
+	error.value = null;
+	try {
+		dbVersion.value = await invoke<string>('db_version');
+	} catch (e: any) {
+		error.value = e?.toString() ?? 'Unbekannter Fehler';
+		dbVersion.value = null;
+	} finally {
+		loading.value = false;
+	}
 }
+
 </script>
 
 <template>
-  <main class="container">
+	<div style="display: flex; flex-direction: column; align-items: center; gap: 1rem; margin-top: 2rem;">
-    <h1>Welcome to Tauri + Vue</h1>
+		<button @click="fetchDbVersion" :disabled="loading">
-
+			{{ loading ? 'Lade...' : 'Datenbank-Version abfragen' }}
-    <div class="row">
+		</button>
-      <a href="https://vite.dev" target="_blank">
+		<div v-if="dbVersion">
-        <img src="/vite.svg" class="logo vite" alt="Vite logo" />
+			<strong>SQLite-Version:</strong> {{ dbVersion }}
-      </a>
+		</div>
-      <a href="https://tauri.app" target="_blank">
+		<div v-if="error" style="color: red;">
-        <img src="/tauri.svg" class="logo tauri" alt="Tauri logo" />
+			Fehler: {{ error }}
-      </a>
+		</div>
-      <a href="https://vuejs.org/" target="_blank">
+	</div>
-        <img src="./assets/vue.svg" class="logo vue" alt="Vue logo" />
+</template>
-      </a>
-    </div>
-    <p>Click on the Tauri, Vite, and Vue logos to learn more.</p>
-
-    <form class="row" @submit.prevent="greet">
-      <input id="greet-input" v-model="name" placeholder="Enter a name..." />
-      <button type="submit">Greet</button>
-    </form>
-    <p>{{ greetMsg }}</p>
-  </main>
-</template>
-
-<style scoped>
-.logo.vite:hover {
-  filter: drop-shadow(0 0 2em #747bff);
-}
-
-.logo.vue:hover {
-  filter: drop-shadow(0 0 2em #249b73);
-}
-
-</style>
-<style>
-:root {
-  font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
-  font-size: 16px;
-  line-height: 24px;
-  font-weight: 400;
-
-  color: #0f0f0f;
-  background-color: #f6f6f6;
-
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-  -webkit-text-size-adjust: 100%;
-}
-
-.container {
-  margin: 0;
-  padding-top: 10vh;
-  display: flex;
-  flex-direction: column;
-  justify-content: center;
-  text-align: center;
-}
-
-.logo {
-  height: 6em;
-  padding: 1.5em;
-  will-change: filter;
-  transition: 0.75s;
-}
-
-.logo.tauri:hover {
-  filter: drop-shadow(0 0 2em #24c8db);
-}
-
-.row {
-  display: flex;
-  justify-content: center;
-}
-
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
-}
-
-a:hover {
-  color: #535bf2;
-}
-
-h1 {
-  text-align: center;
-}
-
-input,
-button {
-  border-radius: 8px;
-  border: 1px solid transparent;
-  padding: 0.6em 1.2em;
-  font-size: 1em;
-  font-weight: 500;
-  font-family: inherit;
-  color: #0f0f0f;
-  background-color: #ffffff;
-  transition: border-color 0.25s;
-  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.2);
-}
-
-button {
-  cursor: pointer;
-}
-
-button:hover {
-  border-color: #396cd8;
-}
-button:active {
-  border-color: #396cd8;
-  background-color: #e8e8e8;
-}
-
-input,
-button {
-  outline: none;
-}
-
-#greet-input {
-  margin-right: 5px;
-}
-
-@media (prefers-color-scheme: dark) {
-  :root {
-    color: #f6f6f6;
-    background-color: #2f2f2f;
-  }
-
-  a:hover {
-    color: #24c8db;
-  }
-
-  input,
-  button {
-    color: #ffffff;
-    background-color: #0f0f0f98;
-  }
-  button:active {
-    background-color: #0f0f0f69;
-  }
-}
-
-</style>

src/enums/nodeTypes.ts

@@ -0,0 +1,5 @@
+enum NodeTypes {
+    type,
+    fill,
+    match,
+}

src/interfaces/Exercise.ts

@@ -0,0 +1,5 @@
+interface Exercise {
+    id: number,
+    type: NodeTypes,
+    content: string // as json
+}

src/interfaces/Path.ts

@@ -0,0 +1,11 @@
+interface Path {
+    id: number,
+    title: string,
+    description: string,
+    nodes: Node[],
+    metadata: {
+        versions: string[],
+        createdAt: Date,
+        updatedAt: Date,
+    }
+}

src/interfaces/PathNode.ts

@@ -0,0 +1,6 @@
+interface Node {
+    id: number,
+    title: string,
+    description: string,
+
+}

src/interfaces/Progress.ts

@@ -0,0 +1,6 @@
+interface Progress {
+    pathId: number,
+    nodeId: number,
+    exerciseId: number,
+    localVersion: number,
+}