Is there a way to check the database version in a flutter app using sqflite?

Question

I am pretty new to flutter and I have some questions about how database version control works for these apps with sqflite.

I have made a database file in my assets

Answer 1

SQFlite has already a built-in version management, but it will work only if you have a migration script. For what you've said that's probably not your case. You'll need to manage your version control by hand:

    class DbHelper {
      static const NEW_DB_VERSION = 2;

      static final DbHelper _instance = DbHelper.internal();

      factory DbHelper() => _instance;

      DbHelper.internal();

      Database _db;

      Future<Database> get db async {
        if (_db != null) {
          return _db;
        } else {
          _db = await initDb();
          return _db;
        }
      }

      Future<Database> initDb() async {

        final databasesPath = await getDatabasesPath();
        final path = join(databasesPath, "database.db");

        var db = await openDatabase(path);

        //if database does not exist yet it will return version 0
        if (await db.getVersion() < NEW_DB_VERSION) {

          db.close();

          //delete the old database so you can copy the new one
          await deleteDatabase(path);

          try {
            await Directory(dirname(path)).create(recursive: true);
          } catch (_) {}

          //copy db from assets to database folder
          ByteData data = await rootBundle.load("assets/databases/database.db");
          List<int> bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
          await File(path).writeAsBytes(bytes, flush: true);

          //open the newly created db 
          db = await openDatabase(path);

          //set the new version to the copied db so you do not need to do it manually on your bundled database.db
          db.setVersion(NEW_DB_VERSION);

        }

        return db;
      }
    }