db.Database.ReadVault C# (CSharp) Method

        public VaultData ReadVault(Account acc)
        {
            MySqlCommand cmd = CreateQuery();
            cmd.CommandText = "SELECT chestId, items FROM vaults WHERE accId=@accId;";
            cmd.Parameters.AddWithValue("@accId", acc.AccountId);
            using (MySqlDataReader rdr = cmd.ExecuteReader())
            {
                if (rdr.HasRows)
                {
                    var ret = new VaultData { Chests = new List<VaultChest>() };
                    while (rdr.Read())
                    {
                        ret.Chests.Add(new VaultChest
                        {
                            ChestId = rdr.GetInt32("chestId"),
                            _Items = rdr.GetString("items")
                        });
                    }
                    return ret;
                }
                return new VaultData
                {
                    Chests = new List<VaultChest>()
                };
            }
        }