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From: "Daniele Futtorovic" <daniele.futtorovic@1:261/38.remove-nlb-this>
Subject: Re: JComboBox with IDentifiers
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Date: Mon, 13 Aug 2012 18:36:23 GMT
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  To: Sax@DIST
From: Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid>

On 13/08/2012 18:22, Sax@DIST allegedly wrote:
> Hi markspace,
>  thanks a lot for the two links you suggested me about the Java Programming
Language!   0;-)
>
> The first one, about the "correct" usage of JComboBox itself, is very
detailed and I think I can find what I need, reading the lots of examples.
>
> The second one, about the database connection, will be very useful for me, as
I need to get the data for the items of my JComboBox from a DataBase Table.
>
> After all, my needs are very simple:
> (o) to read some records (fields required: 'IDentifier' and 'Description')
from a DB-Table
> (o) to show the 'Description' of the records as Items of the JComboBox
> (o) to do something else with the 'IDentifier' of the selected Item within
the JComboBox
>
> Thanks again for your precious help,
>  Greetings.
>   Roberto
>    08-)

Hi Roberto,

You should create a custom data structure containing the data you need 
(identifier and representation, from the looks of it), add them to the 
JComboBox's contents, and use a custom renderer 
(<http://docs.oracle.com/javase/6/docs/api/javax/swing/JComboBox.html#setRender
er(javax.swing.ListCellRenderer)>).
That way, the _items_ in the combo box will always be your custom data 
structure instances (which you can use in #setSelectedItem(Object), for 
instance; or returned by #getSelectedItem()), and the renderer controls how 
they're displayed.

In addition -- I believe I've already seen something like this coded somewhere 
-- you can write your own custom model (<http://docs.oracle.com/javase/6/docs/api/javax/swing/ComboBoxModel.html>)
and have that hook directly to the database, possibly with on-demand, 
lightweight loading of data.

HTH,
--
DF.

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