Possible?Multi-Entity View Object with one Entity Object that is Read-only.

I know this sounds crazy, but I would like to create a multi-entity view object, where one entity object is based on a table in my application (we'll call it "Users", which basically stores the primary key for the person from the institutional people database), and the other table is a entity object based on a view of the institutional people database table (read only access), which we can call "People".
I know that since no updates will be done to the People table, it really should be a read-only View Object, but I would lose the ability to sort on attributes like Last Name, Hire date, etc, since those would be transient attributes in my ViewObject for the Users. By having People as an entity object, I can then create a multi entity view object and have the ability to join Users to People and be able to sort on the above mentioned fields (like Last Name).
The problem is that when I use the JDev (I'm currently using 10.1.2.1) AppModule BC4J tester, when I click on the multi-entity view object that I added to the AppModule it gives me an error:
oracle.jbo.RowCreateException) JBO-25017: Error while creating a new entity row for People.
----- LEVEL 1: DETAIL 0 -----
(java.lang.InstantiationException) null
I have tried to change all the attributes to updateable in my entity object, but no create method, and I have tried to make them all read-only, but no effect, I get the same error (probably because the People view is read-only in my schema).
Is there a way to change the entity object so that it will not try to create a new row when it runs the Tester? So that the multi entity view object behaves more like a view link, but gives me the added bonus of being able to sort on the Last Name column from the People table?
Thanks for any help on this subject...at worst, I will have to use the view link method to get the job accomplished, but it would be "cooler" if this would work!
Jeremy.

Steve, thanks for your quick response to my question.
To answer your questions, I was trying to create the Multi-entity View Object to give me more flexibility when working with my User table, and my People view. The flexibility I desired was that I would be able to sort my Users based on attributes in the People view. This is not possible when the there is only one Entity in my VO, and the People view data are all transient attributes, because they are not in the SQL statement.
Ultimately, after working with one of my colleagues, we decided to use the approach that you mentioned by creating a read-only VO with the SQL query we want to display to the user (contains both User and People data fields), and then use a different ViewObject when performing other actions on the User Table (such as inserts/updates/deletes). By using the setWhereClauseParam() method in the handleLifeCycle() for the JSP page, we should be able to navigate between the different View Objects, so that the user does not see any difference.
Thanks! Oh, and by the way, I have read your article you included before, and I have used it many times before to tune my View Objects! Thanks!

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Two View objects with one Entity object

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How to proceed with this ? When i click on next button of first page it is validating for all mandatory fields.
Regds,

Use custom DataAction for the first page:
package controller;
import oracle.adf.controller.struts.actions.DataAction;
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}http://www.oracle.com/technology/products/jdev/collateral/papers/10g/ADFBindingPrimer/index.html#usingdataaction
Message was edited by:
Sasha
Message was edited by:
Sasha

I have just purchased a new macbook and need to sync my iphone with itunes, i understand that you can only sync your phone with one itunes account. I do not want to wipe my iphone when syncing with this new itunes account. Any advice welcome

I have just purchased a new macbook and need to sync my iphone with itunes, i understand that you can only sync your phone with one itunes account. I do not want to wipe my iphone when syncing with this new itunes account. Any advice welcome

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Pondini wrote:
odysseus wrote:
This is a weird story. My wife has a PowerBook G4/1.33 GHz that she uses in clamshell mode with a 20" Cinema Display. One day under OS X 10.5.6, her Time Machine backups (to a networked 500 GB Time Capsule) failed with the error: Backup failed with error: The target volume is read-only. So I upgraded her to 10.5.7 and erased the sparseimage file, starting a new Time Machine backup. And it just happened again.
Try repairing the sparse bundle, per #A5 of the Time Machine - Troubleshooting *User Tip,* also at the top of this forum.
I've tried this before, but it can't be repaired, because it can't be mounted.
Any idea how this sort of problem arises? My wife was doing something at her computer when the Time Machine error occurred.
One possibility is, the HD in the Time Capsule is beginning to fail (all HDs fail, sooner or later).
I'm backing up to my own sparseimage bundle just fine.
Please don't advise us to upgrade to 10.5.8, because her PowerBook freezes not infrequently with any OS later than 10.5.6, and I was just about to downgrade her from 10.5.7 to 10.5.6.
Those two things may be related. Whatever's going wrong may very well be what's corrupting the backups.
I'd recommend finding out what's wrong with the Powerbook. It's impossible to tell, of course, but that may be the root of the problem.
There's a problem with PowerBooks and Cinema Displays. I've posted a lot about this. Even after a motherboard replacement, my PowerBook G4/1.67 GHz had freezes, and eventually Apple gave me a MacBook Pro, but I think there's a failure involving hardware/software design.
If you haven't yet, I'd start by dong a +*Verify Disk+* on it's internal HD (also per #A5);
That checks out fine.
if there are no errors, or they're fixed and the problem continues, run the +Apple Hardware Test+ from the disc that came with the Mac. (One of the discs should have that, and instructions for running it, printed in tiny type on the label).
If still no help, I'd be inclined to do an +Archive & Install, preserving users & settings,+ of Leopard, then download & install the appropriate "combo" update. That's a combination (thus the clever name) of all the updates to Leopard since it was first released, so installing it should fix anything that's gone wrong since then, such as with one of the normal "point" updates. Info and download available at: http://support.apple.com/downloads/MacOS_X_10_5_8_ComboUpdate (change the last "8" to the desired number). Be sure to do a +Repair Permissions+ via Disk Utility (in your Applications/Utilities folder) afterwards.

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Use custom DataAction for the first page:
package controller;
import oracle.adf.controller.struts.actions.DataAction;
import oracle.adf.controller.struts.actions.DataActionContext;
public class Class1 extends DataAction
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Message was edited by:
Sasha
Message was edited by:
Sasha

BC4J: problems creating view object with multiple entity objects

Hi,
I working with a view object which contains two entity objects with parent-child relationship like this:
ViewObject - ParentEntityObject - PId
PAttribute
CId (FK)
(- ParentChildAssociation)
- ChildEntityObject - CId
- CAttribute
The 'Read Only' and 'References' options are checked for the association in the view object.
I'm creating a new row using this view object. The parent object should be created new and the child object already exists in the database, so I'm setting only the attributes of the parent object (including foreign key).
After creating the row I display it in a jbo:DataTable and only those attributes coming from the parent object are displayed. The attributes of the child object are not set. After a commit all attributes appear.
The problem is, that I want to display the new row with all attributes to the users BEFORE they commit.
I tried to set the child attributes, but they are read only by definition and even when I unchecked the 'Read Only' option and set the attributes to 'Always Updateable' in the view object it is giving me
JBO-27008: Attribute set for CAttribute in view object ViewObject failed.
Is there a way to make all attributes of the child object visible in the view object without committing changes?
(JDev 9.0.2.822)
Any help would be appreciated.
Regards,
Christian

Once again the structure, sorry.
ViewObject
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..|-PAttribute
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|-ParentChildAssociation
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Christian

Implement a View Object with multiple entity objects

Hi
In 'How to' section on the 'otn.oracle.com' (Jdeveloper) web site is tutorial how to implement a View Object with multiple updateable dependent entity objects.
It allows user to insert an employee and a department at the same time.
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Once again the structure, sorry.
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Object myObject;
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charliess wrote:
sometimes i really wonder about the answers in this forum - until now i got not one answer that helps me, even i tried to write down the problem very detailed...
Sometimes I wonder about people who jump onto a site and immediately assume that
1. They are the most important person in the world
2. That they deserved the absolute undivided attention of absolute everyone.
3. That everyone should be absolutely polite to them and provide them with perfect answers.
4. Feel free to denigrate and posit their own opinion on everything while ignoring anything else that anyone else says.
5. Expect that everyone else should understand their poorly worded questions.
Myself I find such individuals extremely amusing. Although they seldom stick around long here. At least not under their original alias.
plaz tel me how to realise your error checking?example plz
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Then you read the JNI documents, all of them, for each method that you are using.
Then you write code such that it actually reflects the documents. For example you check return types. And probably deal with the possibility that JNI methods might throw exceptions.
as far as i know the jni methods like getfieldids and so on throw exceptions other like stObject dont do that the just return nothing
i can see all exceptions in my Java console thats not the Problem, setting the Long Object does not throwing a exception btw->
Myself I wouldn't expect that a JNI exception would show in the java console. Could I suppose though.
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is it possible in general to set an java Long Object created in C(native) into a Object type (Object) overgiven as parameter in my JNI function with the setObject method?
Is it possible that you could actually follow my previous request and create some code that actually runs instead of cut and pasting whatever you feel like?
plz answer also with code and examples i did the same for you...No you didn't. You posted something which would not compile and quite possibly doesn't represent your actual code at all.
And please note that we do not get paid to do this. If you want to pay someone to solve your problem then there are sites for that.
Paying someone allows you to make all sorts of demands. The more you pay the more people will put up with.
If you don't want to pay and do in fact want free answers then it will probably be in your interest to
1. Be polite
2. Answer the questions that have been asked of you.

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Possible?Multi-Entity View Object with one Entity Object that is Read-only.

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