close method
Closes this database connection and releases all resources associated with it. Implementations should also handle close calls in a state where the database isn't open.
Implementation
@override
Future<void> close() async {
if (_delegateAvailable) {
return await _delegate.close();
} else if (_openDelegate case final completer?) {
await completer.future;
await _delegate.close();
} else {
// We never started opening the database, nothing to do.
}
}