Forms PL/SQL

Question

Im having a little difficulty with PL/SQL in forms its different to the pl/sql for sql*plus.
I have an orders form. it has the following fields:
Order Id
Employee ID
Order Quantity
Order Date
Customer Id
Item No
Order Price
It has a subforms which shows the items for the order when a query is run.
I have a button new record with the following PL/SQL:
begin
     clear_form;
     select ord_id.nextval
     into :orders.ORDER_ID
     from dual;
select sysdate
into :orders.ORDER_DATE
from dual;
end;
when i enter a value for item no and quantity i want the sub form to display the record entered. i want the quantity be be checked to see if the value is less than the quantity in stock and if so take away that value. should this be done 'POST CHANGE' of the fields? or should it be done when the user clicks the save button. What is the PL/SQL to do this?

Answer 1

Not sure what you mean by a "subform". Maybe you can explain that.
PL/SQL in Forms is no different from SQL Plus. It is just that there is so much more to do in a form.
when i enter a value for item no and quantity i want the sub form to display the record entered.If you mean that you want to look up the item information and display it in a separate block on the form...
You can do that, but it takes a timer started by the when-validate-item trigger in the item no. Here are two threads where you can view the suggested code:
Re: restricted packaged procedure (FRM-40737)
Re: WHEN-MOUSE-LEAVE and WHEN-VALIDATE-ITEM  on Forms 10g block
i want the quantity be be checked to see if the value is less than the quantity in stock and if so take away that value. should this be done 'POST CHANGE' of the fields? or should it be done when the user clicks the save button. What is the PL/SQL to do this?It should be done in a when-validate-item trigger. Post-change runs other times when you would not want to check the amount available.