如何阅读“老”的sqlite？

Question

I rewrote my existing android app using flutter.

Is it possible to access the old database that my old app created? If i make a SELECT on the old table, i don't get any data.

Old app:

private final static String DB_NAME = "oweapp";

new app:

String path = join(documentsDirectory.path, "oweapp.db");

Answer 1

If you provide the database in the assets folder you should copy the database to de device first. If not, opening a database in the external storage of the device (as you are doing) should work.

ByteData data = await rootBundle.load("assets/oweapp.db");
List<int> bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);

final directory = await getDatabasesPath();
String dbPath = join(directory, "oweapp.db");
await File(dbPath).writeAsBytes(bytes);

// After that you can do:
var db = await openDatabase(dbPath);