void UpdateItem(MerchantTableItemEntry entry)
    {
        string query = "UPDATE merchant_item";
        query += " SET ";
        query += entry.UpdateList ();
        query += " WHERE id=?id";

        // Setup the register data
        List<Register> update = new List<Register> ();
        foreach (string field in entry.fields.Keys) {
            update.Add (entry.fieldToRegister (field));
        }

        DatabasePack.Update (DatabasePack.contentDatabasePrefix, query, update);
    }
    void InsertItem(MerchantTableItemEntry entry)
    {
        string query = "INSERT INTO merchant_item";
        query += " (tableID, count, itemID, refreshTime) ";
        query += "VALUES ";
        query += " (" + entry.tableID + "," + entry.count + "," + entry.itemID + "," + entry.refreshTime + ") ";

        // Setup the register data
        List<Register> update = new List<Register> ();
        foreach (string field in entry.fields.Keys) {
            update.Add (entry.fieldToRegister (field));
        }

        int itemID = -1;
        itemID = DatabasePack.Insert (DatabasePack.contentDatabasePrefix, query, update);

        entry.id = itemID;
    }