public List<T> Select(SqlExpression<T> expression)
    {
        var list = new List<T>();
        using (var db = OpenConnection().Open())
        {
            if (_stores)
            {
                list = db.Select<T>(expression);
            }
            else
            {
                var q = db.From<T>().Where(x => (x as EntityBase).store_id == _store_id);
                list = db.Select<T>(q, expression);
            }

        }
        return list;
    }

list = db.Select<T>(q, expression); // this is not working