How to display a description and make validations

Hello colleagues...
As most of you I'm coming from a Forms background and I'm triying to understand some techniques.
But my question is If have a simple PL/SQL block to display a descripction and make some validations, How can I do the same task using Jdeveloper? for example: I have the follwing PL/SQL in and KEY-NEXT-ITEM trigger.
DECLARE
v_status varchar2(1):=null;
BEGIN
SELECT department_description, department_status
INTO :block.department_description, v_status
FROM departments
where department_id = :block.department_id;
if v_status = 'D' then
message('The department is disable...');
raise form_trigger_failure;
end if;
next_item;
EXCEPTION
when no_data_found then
message('The department you typed does not exist...');
raise form_trigger_failure;
END;
in this case I'm displaying the description of a department and I've validated that the department has to exists and has to be enable. both tasks in the same block.
How can I don the same thing using Jdeveloper and ADF Business Components?
Rafael Enrique Martinez.

Both of these are explained in the ADF Developer Guide that you should read.
Your view object can contain information from multiple tables (with one being the main/updateable table, and the other being read only). This is how you take part of the first issue.
http://download.oracle.com/docs/html/B25947_01/bcvoeo003.htm#sm0176
The validation can be assigned directly to the attribute you want to validate.
Just add a validation to the attribute in the entity object.
http://download.oracle.com/docs/html/B25947_01/bcentities007.htm#sm0152

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