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Update help (merged 2) [message #552026]

Mon, 23 April 2012 04:24

chinaexpat
Messages: 6
Registered: April 2012

Junior Member

I am new to forms. I have a form called University. The form using Oracle standard tool bar to execute query and to update a record. After I change a record with any column and click on Save button. It does not update any records. Why is that? Do I need to do a update trigger and can anybody please give me an example, if I need to create a update trigger? Thanks.

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Re: Update help [message #552028 is a reply to message #552026]

Mon, 23 April 2012 04:28

cookiemonster
Messages: 13972
Registered: September 2008
Location: Rainy Manchester

Senior Member

No you don't need a trigger. It should just update automatically, so you've probably done something to prevent that happening.
Start by creating a pre-update trigger on the block and put a message in it - run the form and see if the message appears.

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Re: Update help [message #552039 is a reply to message #552028]

Mon, 23 April 2012 05:05

chinaexpat
Messages: 6
Registered: April 2012

Junior Member

I have a pre-update trigger in the block and only update two fields. Do I need to add more codes to make sure to update any other column that had been updated?

Here is the code

DECLARE
CURSOR user_id IS select user from dual;
CURSOR update_date IS select SYSDATE from dual;
BEGIN

OPEN user_id;
FETCH user_id INTO :eis_university.last_updated_by;
CLOSE user_id;

OPEN update_date;
FETCH update_date INTO :eis_university.last_updated_date;
CLOSE update_date;

IF :eis_university.created_by IS NULL THEN
Message('error Generating last_updated_by')');
RAISE Form_trigger_Failure;
END IF;
IF :eis_university.creation_date IS NULL THEN
Message('error Generating last_updated_date')');
RAISE Form_trigger_Failure;
END IF;
END;

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Re: Update help [message #552040 is a reply to message #552039]

Mon, 23 April 2012 05:09

cookiemonster
Messages: 13972
Registered: September 2008
Location: Rainy Manchester

Senior Member

1) Please read and follow How to use [code] tags and make your code easier to read?
2) Selecting from dual like that is a waste of time, just assign the values directly:

:eis_university.created_by := user;
:eis_university.creation_date := sysdate;

3) They are never going to be null so those IF statements are a waste of time.
4) Are you actually modifying any items in the form before you press save?

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Re: Update help [message #552041 is a reply to message #552040]

Mon, 23 April 2012 05:22

chinaexpat
Messages: 6
Registered: April 2012

Junior Member

Thanks,

Yes, I modified any items in the form, and pressed save and it showed "Transaction complete:1 record applied and saved" and it did not reflect any changes that I made in the table.

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Re: Update help [message #552043 is a reply to message #552041]

Mon, 23 April 2012 05:28

Littlefoot
Messages: 21826
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Quote:

it did not reflect any changes that I made in the table.

How did you check that?

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Re: Update help [message #552044 is a reply to message #552043]

Mon, 23 April 2012 05:33

chinaexpat
Messages: 6
Registered: April 2012

Junior Member

I meant changes I made in the form.

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Re: Update help [message #552046 is a reply to message #552044]

Mon, 23 April 2012 05:35

Littlefoot
Messages: 21826
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

I know, but - how did you do that? Re-querying the form? In SQL*Plus? Something different?

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Re: Update help [message #552071 is a reply to message #552046]

Mon, 23 April 2012 07:19

chinaexpat
Messages: 6
Registered: April 2012

Junior Member

I re-query the form and use PL/Sql developer.

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Re: Update help [message #552073 is a reply to message #552071]

Mon, 23 April 2012 07:31

cookiemonster
Messages: 13972
Registered: September 2008
Location: Rainy Manchester

Senior Member

The obvious thing to do is run a SQL trace and see what exact update the form is sending to the DB.

[Updated on: Mon, 23 April 2012 07:31]

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Re: Update help [message #552122 is a reply to message #552073]

Mon, 23 April 2012 11:36

Littlefoot
Messages: 21826
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Are these items (you modified in a form) based on table (you based a block on) columns?

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Re: Update help [message #552140 is a reply to message #552122]

Mon, 23 April 2012 18:41

chinaexpat
Messages: 6
Registered: April 2012

Junior Member

I solved the problem, I put the on_update on the form level not on the block level. thanks.

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Re: Update help [message #552152 is a reply to message #552140]

Mon, 23 April 2012 23:59

Littlefoot
Messages: 21826
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Thank you for letting us know.

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Re: Update help [message #552182 is a reply to message #552152]

Tue, 24 April 2012 03:45

cookiemonster
Messages: 13972
Registered: September 2008
Location: Rainy Manchester

Senior Member

You've got an on-update trigger?
Why?
You should never need one.

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