update method
Implementation
bool update(
Map<String, dynamic> filter, Map<String, dynamic> update, bool upsert) {
for (var index = 0; index < _db.dbContent(_name).length; index++) {
if (_applyFilter(_db.dbContent(_name)[index], filter)) {
_db.dbContent(_name)[index] = update;
_db._commit();
return true;
}
}
if (upsert) {
_db[_name].insert(update);
_db._commit();
return true;
}
return false;
}