fnotes/lib/database.dart

import 'package:drift/drift.dart';
import 'dart:io';
import 'package:drift/native.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as p;
import 'package:sqlite3/sqlite3.dart';
import 'package:sqlite3_flutter_libs/sqlite3_flutter_libs.dart';

part 'database.g.dart';

var database = AppDatabase(); //global, since we should only use one instance

class PersistentNote extends Table {
  TextColumn get id => text()();
  TextColumn get content => text()();
}

class PersistentTheme extends Table {
  TextColumn get brightness => text().withDefault(const Constant("dark"))();
}

@DriftDatabase(tables: [PersistentNote, PersistentTheme])
class AppDatabase extends _$AppDatabase {
  AppDatabase() : super(_openConnection());

  @override
  int get schemaVersion => 2;

  @override
  MigrationStrategy get migration {
    return MigrationStrategy(
      onCreate: (Migrator m) async {
        await m.createAll();
      },
      onUpgrade: (Migrator m, int from, int to) async {
        if (from < 2) {
          await m.renameTable(persistentNote, "note_table");
          await m.createTable(persistentTheme);
        }
      },
    );
  }
}

LazyDatabase _openConnection() {
  return LazyDatabase(() async {
    final dbFolder = await getApplicationDocumentsDirectory();
    final file = File(p.join(dbFolder.path, 'db.sqlite'));

    if (Platform.isAndroid) {
      await applyWorkaroundToOpenSqlite3OnOldAndroidVersions();
    }

    final cachebase = (await getTemporaryDirectory()).path;

    sqlite3.tempDirectory = cachebase;

    return NativeDatabase.createInBackground(file);
  });
}