Question

I want to fetch data from MySQL without creating object from class

Normally I do something like

public ArrayList getInventoryByItemId(String ItemId) throws SQLException {
    ArrayList list = new ArrayList<Inventory>();
    String sql = "SELECT iid, i.uid, item_data, item_id, i.ctime, username, gender FROM Inventory i JOIN user u ON i.uid = u.uid WHERE item_id = '"+ItemId+"'";
    Statement stmt = con.createStatement();
    ResultSet rset = stmt.executeQuery(sql);
    while (rset.next()) {
        a = new Inventory(rset.getInt(1), rset.getInt(2), rset.getString(3), rset.getString(4), rset.getTimestamp(6), rset.getString(7), rset.getString(8));
        list.add(a);
    }
    return list;
}

the problem is because Inventory object does not have user data from the joined user table, I cannot create new Inventory.

I just want to automatically make an object where it has all the data attributes, that I can access using the column name.

Thank You

Answer 1

If I got you problem,

You can create new map(HashMap I reccomend) and put values using column name or index as key.
So, your list will be list of maps.

 while (rset.next()) {
        a = new HashMap<Integer,Object>();
        a.put(1,rset.getInt(1));
        ..........
        list.add(a);
    }

Or, If you know exact number of columns, you can user array instead of Map (it will be faster)