work in progress database

lib/database/database.dart

@@ -1,39 +1,32 @@
 import 'package:path/path.dart';
-import 'package:sqflite/sqflite.dart';
 
 // Models
 import 'package:progetto_m335_flutter/model/note.dart';
 import 'package:progetto_m335_flutter/model/promemoria.dart';
+import 'package:sqflite/sqflite.dart';
 
 class NoteDatabase {
   static final NoteDatabase instance = NoteDatabase._init();
   static Database? _database;
 
-  // Zero args constructor needed to extend this class
-  NoteDatabase();
-
   NoteDatabase._init();
 
   Future<Database> get database async {
     if (_database != null) return _database!;
-
     _database = await _initDB('note.db');
     return _database!;
   }
 
   Future<Database> _initDB(String filePath) async {
+    print("Initializing database");
     final databasePath = await getDatabasesPath();
 
     final path = join(databasePath, filePath);
+
     return await openDatabase(path, version: 1, onCreate: _createDB);
   }
 
   Future _createDB(Database database, int version) async {
-    if (await isDatabaseExists()) {
-      print("Database already created");
-      deleteDatabase();
-      print("Database deleted");
-    }
 
     await database.execute('''CREATE TABLE promemoria (
   id INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -62,7 +55,6 @@ class NoteDatabase {
     await fillDemoData(database, version);
   }
 
-
   Future fillDemoData(Database database, int version) async {
     // Add fake categories
     await database.execute('''
@@ -76,11 +68,11 @@ class NoteDatabase {
     'Nota 2',
     '2023-09-28',
     '2023-09-28',
+    '',
     'Questo è un esempio di nota 2.'
   )
 ''');
 
-
     await database.execute('''
   INSERT INTO note (
     title,
@@ -92,6 +84,7 @@ class NoteDatabase {
     'Nota 2',
     '2023-09-28',
     '2023-09-28',
+    '',
     'Questo è un esempio di nota 2.'
   )
 ''');
@@ -112,6 +105,7 @@ class NoteDatabase {
     '2023-09-27',
     '2023-09-27',
     '2023-10-05',
+    '',
     'Questo è un esempio di promemoria 1.',
     'Alta',
     'Rosso'
@@ -134,6 +128,7 @@ class NoteDatabase {
     '2023-09-28',
     '2023-09-28',
     '2023-10-10',
+    '',
     'Questo è un esempio di promemoria 2.',
     'Media',
     'Verde'
@@ -160,24 +155,16 @@ class NoteDatabase {
     database.close();
   }
 
-
   Future<void> deleteDatabase() async {
-    final databasePath = await getDatabasesPath();
-    final path = join(databasePath, 'note.db');
-    databaseFactory.deleteDatabase(path);
+    try {
+      final databasePath = await getDatabasesPath();
+      final path = join(databasePath, 'note.db');
+      databaseFactory.deleteDatabase(path);
+    } catch (error) {
+      throw Exception('DbBase.deleteDatabase: $error');
+    }
   }
 
-  Future<bool> isDatabaseExists() async {
-    final databasePath = await getDatabasesPath();
-    final path = join(databasePath, 'note.db');
-    // Apre il database in modalità sola lettura.
-    Database database = await openDatabase(path, readOnly: true);
-
-    // Restituisce true se il database è stato aperto correttamente, altrimenti false.
-    return database.isOpen;
-  }
-
-
   Future<void> createNote(Database database, Note note) async {
     await database.execute('''
       INSERT INTO note (
@@ -207,7 +194,6 @@ class NoteDatabase {
     return maps;
   }
 
-
   Future<List<Map>> selectAllNotes() async {
     final db = await database;
 
@@ -216,9 +202,8 @@ class NoteDatabase {
     return maps;
   }
 
-
-  Future<void> createPromemoria(Database database,
-      Promemoria promemoria) async {
+  Future<void> createPromemoria(
+      Database database, Promemoria promemoria) async {
     await database.execute('''
       INSERT INTO promemoria (
         title,
@@ -244,7 +229,6 @@ class NoteDatabase {
     print('promemoria $promemoria.title inserted');
   }
 
-
   Future<Map<String, Object?>> readPromemoria(int id) async {
     final db = await database;
 
@@ -252,23 +236,19 @@ class NoteDatabase {
     return results.first;
   }
 
-
   Future<Map<String, Object?>> readNote(int id) async {
     final db = await database;
 
-    final results= await db.query('SELECT * FROM promemoria where id=$id');
+    final results = await db.query('SELECT * FROM promemoria where id=$id');
 
     return results.first;
   }
 
 //  Future<void> updatePromemoria(Promemoria promemoria) async {
-  //  final db = await database;
+//  final db = await database;
 
-  //await db.update('promemoria', promemoria, where: 'id = ?',
-      // Pass the Dog's id as a whereArg to prevent SQL injection.
+//await db.update('promemoria', promemoria, where: 'id = ?',
+// Pass the Dog's id as a whereArg to prevent SQL injection.
 //  whereArgs: [dog.id],)
 //}
-
-
 }
-

lib/pages/test.dart

@@ -29,6 +29,14 @@ class _TestState extends State<Test> {
     print("Data printed");
   }
 
+  Future<void> _deletedatabase() async {
+    final db = await noteDatabase.database;
+
+    print("Deleting database");
+    await db.delete(noteTable);
+    print("Database deleted");
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -36,7 +44,8 @@ class _TestState extends State<Test> {
             child: Column(
               children: [
                 FloatingActionButton(onPressed: _pressed),
-                FloatingActionButton(onPressed: _printdata)
+                FloatingActionButton(onPressed: _printdata),
+                FloatingActionButton(onPressed: _deletedatabase)
               ],
             )
         )