Question

difference between WHEN-NEW-FORM-INSTANCE and PRE_FORM triggers?

Asked by: joekeri

WHAT is the difference between WHEN-NEW-FORM-INSTANCE and PRE_FORM triggers?

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Asked On
2007-07-12 at 08:57:26ID22692143
Tags

between

,

difference

,

trigger

Topics

Oracle 9.x

,

Oracle Database

,

Oracle 8.x

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3
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Answers

 

by: sujit_kumarPosted on 2007-07-12 at 09:07:38ID: 19473257

PRE-FORM is triggered pror to loading of the form. WHEN-NEW-FORM-INSTANCE is when the form is loading currently. So PRE-FORM trigger is always fired before WHEN-NEW-FORM-INSTANCE .

 

by: joekeriPosted on 2007-07-12 at 10:20:47ID: 19473947

so, a WHEN-NEW-FORM-INSTANCE trigger fires , for example in a query form, once after each query is completed?

 

by: markgeerPosted on 2007-07-12 at 13:13:44ID: 19475756

No.  The WHEN-NEW-FORM-INSTANCE trigger fires just once when the form starts, right after the PRE-FORM trigger and before any queries are executed.  The WHEN-NEW-FORM-INSTANCE trigger is not fired again unless the user closes the form and re-opens it.

 

by: joekeriPosted on 2007-07-12 at 13:26:49ID: 19475885

I don't see the difference between these two triggers at all.  From what I undesatnd, either trigger can be used in a form because they both do the same thing.

am I correct?

 

by: nav_kum_vPosted on 2007-07-12 at 15:13:17ID: 19476725

there a lot of differences if you dig into...

in pre-form trigger, restricted builtins cannot be used ( only sql stmts and unrestricted builtins can be used )

in when-new-form-instance trigger, restricted builtins can also be used along with sql statements and unrestricted builtins.
========================================================================

Use a PreForm trigger to perform the following tasks:
" assign unique primary key from sequence
" restrict access to a form
" initialize global variables

-----------------------------------------------------------------

WhenNewFormInstance Trigger
At form startup, Oracle Forms navigates to the first navigable item in
the first navigable block. A WhenNewFormInstance trigger fires
after the successful completion of any navigational triggers that fire
during the initial navigation sequence.
This trigger does not fire when control returns to a calling form from a
called form.
In a multipleform application, this trigger does not fire when focus
changes from one form to another.

example for when-new-form-instance trigger :
This example sets up all necessary global variables, writes dynamic
boilerplate, starts a timer to refresh the onscreen clock, and queries the
first block.
BEGIN
Setup_My_Global_Variables;
Populate_Dynamic_Boilerplate;
Start_OnScreen_Clock_Timer;
Go_Block(Primary_Ord_Info);
/*
** Query the block without showing
** the working message.
*/
:System.Suppress_Working := TRUE;
Execute_Query;
:System.Suppress_Working := FALSE;
END;

You can get this information from forms reference guide,

Thanks

 

by: markgeerPosted on 2007-07-13 at 05:35:15ID: 19480143

So, in simple terms: the PRE-FORM trigger is much more limited in what it can do than the WHEN-NEW-FORM-INSTANCE trigger is. For example,  if you want to automatically navigate to a particular block in a multi-block form and do a query there when the form starts, you have to use the WHEN-NEW-FORM-INSTANCE trigger for that.

20120131-EE-VQP-002

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