Resynchronising form when table changes

I want to resynchronise my form when table changes, i.e., new column added, datatype changes etc.
How do I do this? I remember seeing a note on this many months back.

John,
As far as I know this is not supported. Changing data types might work fine, but if you add/delete a column to the table
then you will manually have to edit the form. In some cases might even have to recreate it.
Thanx,
Chetan.

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Trigger java client update when table changes

I have a Java Swing client and a C worker program. Both need to communicate with each other via events (C writes progress to Oracle table, Java Swing client displays progress to user).
I thought I'd do this via a trigger on an oracle table. However, I couldn't figure out how to achieve that. Well, creating the trigger was the easy part, but how do I let the trigger and as a follow-up a stored procedure communicate with my Java client? All the info I found was about triggers and how to store a Java method in an Oracle DB. That's not what I need. I guess I need to register my Java client somehow to monitor the trigger / table.
Does anyone know how to do that? I'd prefer to not use any additional libraries (Oracle AQ libraries, Oracle streams). A simple trigger would suffice.
Thank you very much for your help!

rp0428 wrote:
>
The client should poll for updates.
Pushing from the database, which your original suggestion and the others provides no benefit in terms of the enterprise and might cause unforseen and difficult to diagnose problems.
>
I don't agree with either of these comments. Please explain them and provide any supporting documentation or other reliabe sources that you are basing these comments on.
In particular clarify whether your comments are about the technology of notification in general or whether you feel that the notification solution is not appropriate for this particular use case.
Polling is generally a terribly wasteful, inefficient and non-productive method of trying to identify changes that happen in a database. Provide supporting documentation for that.
Naturally the actual metrics for this depend on the number, types and frequency of the DB changes in general and with their relation to the polling frequency in particular.Yep. And most of the time the specifics for that is such that one or both the following is true
1. The requirements are wrong (for example no GUI needs to be update 100 times a second.)
2. The requirements are loose enough that polling is perfectly adquate and appropriate solution.
Oracle itself has gone in the opposite direction with the technology that it develops as can be inferred by the various methods provided in recent releases to support replication and the technology underlying the support of fast refresh materialized views.
Oracle has all sorts of stuff in it. That doesn't mean that it ideal for all situations or even most situations.
These technologies include Advanced Queuing, Change Data Capture, Advanced Replication, Standby Databases and the like.
The only major Oracle technology that I am aware of that does not tend towards publish/subscribe is LogMiner and it does not use polling but rather uses a batch query process.
And yet for 20 years people have managed to implement large solutions without that.
Detection of DB changes is difficult for even small single tables without using functionality provided by Oracle specifically for that purpose. There are many, many references in these forums and on the web in general where developers have attempted to 'roll-their-own' procedures for detecting changes after the fact. Most of these attempts are flawed both in their design and execution.
And yet you think that this new technology will provide immediate error free solutions both on Oracles sides and the implementors side?
Polling is generally wasteful and inefficient for several reasons. First, poll queries can execute repeatedly when there haven't been any changes at all. This effort is entirely wasted and non-productive.
I have a large volume database server whose cpu utilization is less than 3% with a projected volume this year of 3/4 billion dollars. In the mid 1980s I was more concerned with utilization. Not so much any more.
On the other hand experience would suggest that developers have far, far more problems getting the database designs right in the first place. So I don't have great confidence in their ability to use brand new technologies to solve large volume problems.
And if they don't have large volumes then the point is moot.
The poll queries cannot easily determine exactly when the change occured; change meaning it was COMMITTED to the database. The common approach of updating columns such as MODIFIED_DATE within a trigger are flawed because any such date/time assigned in the trigger is virtually guaranteed to occur BEFORE the data is actually committed.
The classic flaw manifests itself when the trigger assigns a value before midnight but the commit actually occurs after midnight. Thus two INSERT/UPDATES can have their data COMMITTED at exactly the same SCN and timestamp value but the MODIFIED_DATE values can be for two different days.
There is no way to query this data on a nightly basis to get 'changes that happened today' with the risk of missing data the next night when the extract occurs, or worse, duplicating some data in the extracts for two different nights.
I agree that the design you specified is flawed.
It however is an excellent demonstration of how a developer might create a flawed design - as I a suggested. New technologies do not fix flawed designs. All they do is provide even more ways to create flawed designs. Which is exacerbated by large volume needs.
And 'pushing from the database'? The change notification process is similar to publish/subscribe mechanisms and also similar to the way that listeners are used in Java.
Certainly you wouldn't suggest that Java applications should 'poll' GUI objects to see if a user has taken any action would you?
I agree your analogy is not apt for this discussion.

Update form when table is updated

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I am quite new to apex and i have come across an issue. I have created a table with 10 columns and from that created a form/report.i have to update my table by adding new columns but i can't get my report updated.
i have manually included the field in my sql query but tat didnt seem to work.
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Hi,
Normally, the report would just update automatically to include new columns - usually these are placed at the end of the list of columns. If you edit your report region and click on the Report Attributes tab, do you see your new columns there? If so, is the Show checkbox ticked for them? If it isn't, tick it. If you click on the Edit icon next to a missing column, what "Display As" is set - is it "Standard Report Column"?
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I have table level constraint in database.
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Chirag,
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3) Do not use tabs. Next->
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or
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Andy,
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jdev version-11.1.2.1.0
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Now when i create a new row in Detail table using CreateInsert button a blank new row created on the top of detail table.
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ORA-20505: Error in DML: p_rowid=APL11163, p_alt_rowid=transcontrolnum, p_rowid2=, p_alt_rowid2=. ORA-06550: line 1, column 99: PLS-00201: identifier 'transcontrolnum' must be declared ORA-06550: line 1, column 9: PL/SQL: SQL Statement ignored
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OK

You should check the source of your page items:
P?_TRANSCONTROLNUM
It looks like you don't have this column in your table or there is a typo in the source.
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://htmldb.oracle.com/pls/otn/f?p=31517:1
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I have created a form in InDesign, exported to a pdf, created an editable form and saved. When I open the form and make changes and save, the reopen the changes are there. If try to email this form as an attachment after editing, the attachment is alway

I have created a form in InDesign, exported to a pdf, then created an editable form and saved. When I open the form and make changes and save, then reopen the changes are there. If try to email this form as an attachment after editing, the attachment is always minus the edits. ????

Hi chuck,
If you ave created the form and then filling it yourself and saving the form, the filled data should be there when you reopen the same form.
Can you please send the form to me at [email protected] so that I can have a look.
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Rave

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Hi
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Edited by: Gerry on 2011-6-22 下午6:08

Hi,
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Be advised that this solution will also exit the form without saving the changes and asking anything if the user did make changes.
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VRdida,
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"in indexes, the space can be reused only by rows with the same key-filed"
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Search Tom Kyte's site here for rebuilding indexes or reorganizong indexes for many, often lively, discussions.
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Resynchronising form when table changes

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