ADF Entity Object

Is it true that
1) Against every request, for data, from the screen (ViewController UI), the data is fetched from the related Entity object only and no request is fired to the database at any level.
2) When both Application Server & database Server are up, Entity Object & the related database table are always completely synchronized (Whether data is changed manually directly at database level or through related ViewController UI).

Hi,
see the documentation
http://www.oracle.com/webapps/online-help/jdeveloper/10.1.2?topic=bc_acaches_html
and
http://www3.nexpak.com/bc4jdoc/bc_ahowdoesbltcachedata.htm
Frank

Similar Messages

Can Designer generate ADF Entity Objects, View Objects and Apps Module ?

Hi all,
On what way can Designer integrate with JDeveloper (+ ADF) ?
Can Designer generate ADF Entity Objects, View Objects and Apps Module ?
Thank you for your help,
xtanto

Designer itself has no direct integration with JDeveloper. However, there are three options. First of all, you can get a JDeveloper extension (download this separately) that lets you create a Connection to a Designer repository. From that Connection you can find modules that you defined in Designer and generate Entity and View objects for the tables and columns that you used in those modules, and an Application Module. It does not create JSPs or other user interface objects.
Another option is to buy JHeadstart from Oracle. This contains a set of code generators and ADF extensions that include an ability to get information from a Designer repository. JHeadstart works fine for non-Designer users too, but was built by the same people who wrote Designer Headstart - they know the repository API intimately.
The third option is to download Oracle Designer Extension Builder (ODEB) which was just recently made available. This is a product of a collaboration between Designer users from the Oracle Development Tools Users Group (ODTUG) and Oracle to extend the capabilities of Designer with user written tools and utilities. You could use ODEB to write your own generators for ADF Business Components. Or you could wait and see if someone else in the user community does this. I hope that you or whoever does such a generator will be willing to share it with us all.

Passing SQL Server identity attributes values into adf entity objects

Hi all.
I'm using Jdeveloper 10g for developing an ADF Swing application based on MS SQL Server DB.
Does anyone know if it is possible to pass SQL Server identity attributes values into the correspondent attrributes of adf entity objects, like we do with Oracle DB Sequence.
The problem is that i should somhow implement cascade deleting of detail view objects, so i should use the composition association. But since i cant fill the primary key attribute with appropriate value (that is actually a ms sql server db sequence value) i always get
the following exception: oracle.jbo.InvalidOwnerException: JBO-25030 as i try to create a new pair of master/detail objects.
Thanks in advance.
Alex.

The approach is good. but i still dont understand how i can address the sql server db sequence (identity field) programmatically...
The code offered
SequenceImpl sequence = new SequenceImpl("PRODUCTS_SEQ",getDBTransaction());
setProdId(sequence.getSequenceNumber());
generates something like this:
select deq_name.nextval from dual
but this syntax works for oracle only... and not for sql server...
Edited by: Timin on Mar 26, 2009 6:34 AM
Edited by: Timin on Mar 26, 2009 10:25 AM

Should ADF Entity Object Map to Database Table or View?

We are building a new 3-tier JClient/ADF application. We have mapped most entity objects directly to database tables. Now that we are preparing to deploy, our DBA is angry; he believes that all entity objects should be mapped to database views. The developers see this as a headache, UML can not forward/reverse changes, and now we have another layer of abstraction, which doesn't seem to serve a useful purpose. What is the best practice in a new 3-tier application?

Hi,
I'm still having problems but I found out why these tables are returning errors. The username I've been given by the DBA to connect to the database is CONSULTA, but this user is only for querying purposes, the actual objects reside on a differente schema, of course, which is PROD. So the line:
"CONSULTA"."ESTADOS"@"PROD@AYADEV_LOCATION" "ESTADOS"
raises an exception because the table ESTADOS is not located on that schema, but on PROD. If I query the table from SQL Plus with:
SELECT *
FROM [email protected]@AYADEV_LOCATION
then there's no problem at all.
Why is this? How do I instruct OWB to point to the correct schema or to avoind fully qualifying the table name?
Please help me, I'm kind of confused here.
Best Regards,
--oswaldo.
[osantos]

Human Task Bulk API calls from ADF Entity Object

Dear all,
Jdev: 11.1.1.7.1
We have a requirement where in human task APIs need to be invoked on status changes of an ADF Entity (EO). We presently achieve this in the afterCommit() method and all is well.
But we are looking to leverage the Human Task bulk update APIs and am wondering how to do that.
The EO does support a batch mode - Is there a batch mode API that we can override to place the bulk update API call?
Thanks

in version 11.1.1.6 getInputStream() and getContent() do not work, this is know bug you can find in the oracle support at
https://support.oracle.com/epmos/faces/ui/km/SearchDocDisplay.jspx?_afrLoop=175895926830291&type=DOCUMENT&id=1451100.1&displayIndex=8&_afrWindowMode=0&_adf.ctrl-state=tlzphlagm_69
there you can find a .zip file with a full example code.
Actually Oracle does not consider it a bug:
"This issue was reviewed by Engineering in Bug 13873092 and is not considered a bug. There is a workaround to retrieve task contents through 'WFTaskUpdate' Servlet as described in the attached Sample project."
but in my opinion it is a very big bug endeed, and it drove me mad for days! :(
Anyway here is a snippet with the workaroud in case you do not have access to the oracle support site:
if att is you attachment and wfContext is your workflow context set somewhere
AttachmentType att;
IWorkflowContext wfContext;
instead of doing this
InputStream inputStream = att.getInputStream();
do this
String contextId = wfContext.getToken();
String attachmentURL = WFUtils.getTaskUpdateURL(att.getTaskId(), contextId, "" + att.getVersion(),att.getName(),
Constants.WFTASK_QUERY_ATTACHMENT_BUTTON_KEY_NAME);
if ( attachmentURL == null ) {
System.out.println("Unable to generate URL to get attachmentcontent");
try {
URL url = new URL(attachmentURL);
URLConnection conn = url.openConnection();
InputStream inputStream = conn.getInputStream();
} catch ( Exception e ) {
e.printStackTrace();
hope this helps
Massi

ADF Entity Object: Securable Operation "Create"?

Hello,
I have the following scenario: Within one view I have a table bound to a view object that bases on an entity object. The view also contains a "create insert" button.
Now I want to secure the "create insert" operation with a certain application role. However, within the entity object I can only activate the removeCurrentRow, read and update options as securable operation. Is there any way to control the creation of new items?
Regards,
Michael

Hi.
welcome to forum!
Maybe this post can be useful http://andrejusb.blogspot.com/2011/03/how-to-enable-create-operation-security.html

Multiple updateable adf entity objects

I've got a situation that is real similar to something that's covered in the developer's guide, yet it's just different enough that I need to get someone's help. I have a view object that is based on two entity objects. These 2 entity objects have a one to one association with each other. They both share the same primary key (hris_id). There is no foreign key relationship between them. This hris_id column for one of the entity objects has been set as a DBSequence type so that it's value can be set by a sequence. When i want to create a new row via this view object, I need to know where/when I can get this sequence generated value from the first entity object so that when the second entity row gets created, i can use this value (hris_id) from the first entity object to populate the hris_id column in the table for the "second" entity, since both tables will need to share the same value for hris_id column. Just not sure about where in the code this needs to happen. Any ideas? Thanks.

Hi,
I think your situation is similar as described in the guide.
Override create in your view object row class, create first and second entity and probably you need to copy key value from first to second entity.
Try this:
    @Override
    protected void create(AttributeList attributeList) {
        Entity1Impl newEntity1 = getEntity1();
        Entity2Impl newEntity2 = getEntity2();
        try {
            newEntity1.create(attributeList);
            oracle.jbo.domain.Number hrisId = newEntity1.getHrisId().getSequenceNumber();
            newEntity2.create(attributeList);
            newEntity2.setHrisId(hridId);
            .Rado

ADF BC Entity Object read security

hi
Please consider the example application in this blog post by Andrejus Baranovskis:
"ADF Security 11g and ADF Business Components"
http://andrejusb.blogspot.com/2008/10/adf-security-11g-and-adf-business.html
What is the "read" operation used for in the Security section of the "Jobs" Entity Object configuration?
I modified the example application and checked the enabled checkbox for the "read" operation on the "Jobs" Entity Object. After that, using the "Edit Authorization..." dialog (from the context menu on the "Jobs" Entity Object in the Structure Panel), I checked the "Read" checkbox for the "clerk" role.
This looks to me like a configuration from which one could expect that only a "clerk" can read.
After that I run the "HrModule" Application Module and authenticate as a "developer" (user "steve"), which has no privileges granted, and I can still read all the attributes for the rows in the "JobsView1" View Object instance (which is based on the "JobsView" View Object for which all the attributes come from the "Jobs" Entity Object).
How can this be explained?
many thanks
Jan Vervecken

Thanks for your reply Brenden.
Yes, my question seems to be the same as in the forum thread you refer to,
"11g ADF BC security - read operation?".
In that thread Frank Nimphius points out "this seems to be malfunctioning and will be bugged",
and also Chris Muir writes "... the documentation is a little misleading then ...".
regards
Jan

ADF: use of view link Accessor in Entity Object = always null?

Hi,
JClient 9.0.5.2, adf model.
I would like to use the view link accessor method in the master EO to retrieve detail EO values and the view link accessor method in the detail EO to retrieve master EO values.
Detail Rule:
In the detail EO an attribute is derived from an attribute of the master EO: detail attribute = master attribute.
Master Rule:
In the master EO an attribute is derived from the detail EO: master atribute set to 0 if detail EO exist else set to 0.
Tables:
Table Master => MasterEO => MasterVO
- masterPK (not updateable)
- masterField (not updateable)
- hasDetailsFlag
Table Detail => DetailEO => DetailVO
- detailPK (not updateable)
- masterPK => foreign key (not updateable)
- masterField (query only)
MasterDetailLink based on foreign key.
In link wizard I asked for the generation of following accessors in the source & destination Entity Objects:
In DetailEO accessor name: RetrieveFromMaster
In MasterEO accessor name: RetrieveFromDetail
In the DetailEO, I asked for the generation of the DetailEOImpl file, accessors and create method.
As wriiten in the file, before the create method:
** Add attribute defaulting logic in this method. **
I tought this is the place to retrieve the master attribute:
The code:
MasterVORowImpl masterVO = getRetrieveFromMaster();
if (masterVO == null)
System.out.println("MasterVORowImpl masterVO create NNNNNNNNNNNUUUUUUUULLLLLLLLLL");
The masterVO is always null?
I suppose I didn't understand something, my guest is that ViewObjects may not be used for default logic?
I know how to implement those rules in the database with triggers.
I think that the data I need for implementing those rules exist somewhere at the ADF level so retrieving the data from the db is not necessary?
Could somebody give some clues?
I didn't find a similar example in the Business Rules in BC4J document.
Your help will be appreciated
Frederic

Hi,
Detail Rule, copy attribute value form master.
In DetailEOImpl:
protected void create(AttributeList attributeList)
setAttribute(MASTERFIELD,this.getMaster().getMasterField());
super.create(attributeList);
Master rule, set flag to 0 if no details else set to 1.
In the MasterEOImpl added method to check if detail row exists based on Row Iterator => no db retrieval?
This method also sets the flag accordingly:
protected void checkHasOtherDetails()
oracle.jbo.RowIterator ri = this.getRetrieveFromdetail();
ri.last();
// last() must be called else hasNext() returns true even on last delete ???
Number hasDetails = Constants.NUMBER_NO; // = 1
if (ri.hasNext() || ri.hasPrevious())
hasDetails = Constants.NUMBER_YES; // = 0
if (!getHasDetailsFlag().equals(hasDetails)) {
this.setHasDetailsFlag(hasDetails);
I call this method in the remove method of the detailEOImpl:
public void remove()
this.getRetrieeFromMaster().checkHasOtherDetails();
super.remove();
To set the flag I added follwoing code in the create method of the DetailEOImpl:
protected void create(AttributeList attributeList)
setAttribute(MASTERFIELD,this.getMaster().getMasterField());
**** ADDED ***
Number masterHasDetailsFlag = getRetrieveFromMaster().getHasDetailsFlag();
if (!masterHasDetailsFlag.equals(Constants.NUMBER_YES)) {
getRetrieveFromMaster().setHasDetailsFlag(Constants.NUMBER_YES));
super.create(attributeList);
One more question:
Is there a danger of calling last() on row iterators in create/update/remove methods of *Impl files?
=> current row changed => any effect on display in JPanel
Thanks
Frederic
PS All variable/method/class names have been manually renamed in this code so some small syntax problems may exist.

Unable to create Entity objects for tables in TimesTen database using ADF

Hi,
I am not able to create Entity and View objects for tables in TimesTen database using ADF. I have installed TimesTen client on my machine.
I have created a database connection by using connection type as "Generic JDBC" and giving driver class and JDBC URL. I am attaching screen shot of the same.
I am right clicking on Model project and selecting New option after that I am selecting ADF Business components and in it I am selecting Business components from tables and there I am querying for tables.I am getting list of tables and when I am trying to create a Entity object from the table after clicking finish Jdev is closing by itself giving an error.
Can anyone please help me how to create Entity objects for tables using TimesTen as database.I might be missing some jars or the way I am creating connection might be wrong or any plugins required to connect to TimesTen.

What is the actual error being given by Jdev? Are you sure that the JDBC connection is using the TimesTen JDBC driver JAR and not some other JDBC driver or the Generic JDBC/ODBC bridge?
Is ADF even supported with TimesTen?
Chris

Dynamic Creation of Entity Objects (ADF Business Components)

Hi All,
We have a requirement to create Entity Objects for the dynamically generated tables in our application and at the same time bind them to different views.
Our product create multiple tables at runtime with some sort of naming convention, and we couldn't find a way in JDeveloper to generate entity objects for the tables created dynamically.
Please provide some pointers if you have experienced or worked on similar requirement.
Thanks,
Nikhilesh

Thanks for the help Sudipto.
The link which you have shared, describes the creation of an entity object and then modify the operations like Delete Update and Insert etc to be performed on the entity object by creating IMPL classes and implementing certain interfaces.
But I need to create Entity objects dynamically. My application creates new tables for some functionality at the run time and I have to create Entity objects for those new tables as soon as the new tables are created.
I was just wondering if, there is any API available for creating the entity object from Java code instead of invoking the wizard in the Jdeveloper.

Uix two view-objects on one entity-object synchronize

Hi All
I want to add some uix pages to an old project using ADF UIX and Business Components.
I have an entity object to a table witch about 50 fields.
Now I create two view objects due to a better performance. One witch seven attributes for the overwiew and one with all attributes for the detail page.
They are related via a view link.
I create the overview as a read-only-table and the detail-page as an input-form.
The proplem is that the synchronization don't work. The detail page shows the first dataset ever.
Has anyone a solution or a tip where I can found that?
Is where a performance problem if I use one view-object for both pages?
Thanks in advance
Roger

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
protected void validateModelUpdates(DataActionContext actionContext)
//super.validateModelUpdates(actionContext);
// put you custom validation here
}http://www.oracle.com/technology/products/jdev/collateral/papers/10g/ADFBindingPrimer/index.html#usingdataaction
Message was edited by:
Sasha
Message was edited by:
Sasha

ADF View objects question

Hello,
I created a view object (which bases on an entity object) that I'd like to use for searching for records in a table called "CARS". Cars will be searched by names. I also have a JSP page for adding cars (administration functionality).
The situation is as follows:
1. I go to the page for adding cars and click "Submit" (which only submits data without committing to the database).
2. Then I have validation errors (which is ok because some fields are mandatory).
3. I search for cars by name.
The funny part is that if I search for cars with given names, I get those cars AND I get the empty row with this new car I'd tried to add just a moment ago. It's definitely not yet in the database and the name of this car is not set (so it shouldn't match with the name I'm searching for).
My question is: why is it happening and what should I do to get the rows created but not yet committed not appear in the search results?
I tried to use clearCache() method of ViewObjectImpl but the result is still the same.
Please help because I desperately need this for my diploma project.
Thanks,
Anna

I run: "java -Djbo.viewlink.consistent=false -jar oc4j.jar" and I still get new rows. I'm using OC4J 10g (9.0.4.0.0) standalone that comes with JDeveloper 10g (9.0.5.2) on Linux.
And about that Create pages: I mean I click on a link "New something" 3 times (for example). I don't use the browser back button because I have my menu on each page. In this case I'm just curious if it's possible to somehow "overwrite" previous "new" rows with the most recent one.
I thought I would need that but now I know I need something else.
Imagine such a situation:
1. A user wants to create a new row or update an existing one.
2. They start filling the form and submit it (in my case it's committing at the same time)
3. During validation it turns out that some required values are missing so the user has to enter them.
4. At this point the user leaves the input form and decides to add or update a different row.
5. The user enters all the required values and this time validation would succeed. However, because of points 2. and 3. it does not.
Now my question is: how can I make ADF somehow "forget" about the row inserted/updated in point 2. I know that ADF validates all new/changed rows at a time. But I would like to change that behavior so that it would validate only the row changed/created most recently.
Thanks,
Anna

ADF - View Objects

Hi All,
We are working on building a web application using on ADF.
The landing page of our application is a dashboard screen that is read-only with 100 to 500 records displayed in a table.
User can move to other pages and create requests.
1) When user is on dashboard and moves to other pages of the application, is there a way to release the memory used by view objects and underlying entity objects used by the views used to display the dashboard? Another point here is, our application requirement is to refresh the data from database when user moves between screens. Even if user switches back to dashboard screen after moving to other screen the data needs to be queried anyway. So for better memory management of the application we would like to release the memory for GC when user leaves our dashboard screens.
Another question I have is:
2) When a application module passivation occurs, will there be a snapshot taken for all view rows and entity caches or will it be only for pending DB state - entities added/modified/deleted? - We have lot of cases in our application where we display read-only dashboards and I am trying to understand if we can turnoff the passivation on view objects used to display read-only data if passivation deals with only pending DB state.
Please suggest.

Hi,
1) When user is on dashboard and moves to other pages of the application, is there a way to release the memory used by view objects and underlying entity objects used by the views used to display the dashboard? Another point here is, our application requirement is to refresh the data from database when user moves between screens. Even if user switches back to dashboard screen after moving to other screen the data needs to be queried anyway. So for better memory management of the application we would like to release the memory for GC when user leaves our dashboard screens.
Note that premature optimization can be contra-productive and often is the root of all evil. In other words, as long as you don't experience performance problems, I would let the framework do its job - so be careful wanting too much without a reason. Anyway, to clear the entity cache (and this is the only memory you need to bother for) you can call <ApplicationModuleInstance>.getTransaction().clearEntityCache(String entityName);
clearEntityCache
public void clearEntityCache(java.lang.String entityName)
Clears the cache of the specified Entity Object. A value of null clears the caches of all Entities. If a View Object uses the Entity Object, the View Object's cache will be cleared as well.
Parameters:
entityName - the name of the entity whose cache is to be cleared. If null, caches for all entities are cleared.
Another question I have is:
2) When a application module passivation occurs, will there be a snapshot taken for all view rows and entity caches or will it be only for pending DB state - entities added/modified/deleted? - We have lot of cases in our application where we display read-only dashboards and I am trying to understand if we can turnoff the passivation on view objects used to display read-only data if passivation deals with only pending DB state.
Passivation is for pending changes only and not for all queried data. You define passivation on the AM level and you can switch it off there. In this case I suggest you use an Application Module that speacifically holds the dashboard queries.
Since performance is your concern I recommend you reading:
Advanced View Object Techniques - 11g Release 1 (11.1.1.7.0)
Tuning Application Module Pools and Connection Pools - 11g Release 1 (11.1.1.7.0)
Frank

How do I obtain the next number for a Primary Key using an ADF View Object?

I have two separate View Objects (A & B) for the same Entity Object. View Object A does a SELECT on all of the fields in the table. This View Object is where I execute my adds and updates. View Object B is only used to retrieve the next number for the primary key. This is done so that when I add a row to the database, I always get the max number of the primary key and add one to it. I accomplished this by setting the SQL mode to Expert and using the SQL: "SELECT MAX(NBR) AS MAX_NUMBER FROM TABLE_1". This may be overkill having a seperate View Object for this, but so far this is the only way I have found to obtain the next number. However, I have discovered that this way does not always work.
The problem I'm running into is when I try to add multiple records to View Object A without committing the transaction between each add. Because View Object B is disconnected from View Object A, the MAX_NUMBER of View Object B comes back with the same number for each add I do on View Object A. So I know I must retrieve the MAX_NUMBER from View Object A.
I've tried using the following code in my Table1ViewImpl class:
this.setQuery("SELECT MAX(Table1.NBR) AS MAX_NUMBER FROM TABLE_1 Table1");
this.executeQuery();
The view object now has what I want, but I have yet to figure a way to extract the MAX_NUMBER out of the View Object. I've also looked into using the method addDynamicAttribute() but I can't figure out any way to set the attribute with the MAX_NUMBER.
I can't be the only one trying to retrieve the next number from a database table using ADF. Can anyone help me with this? FYI - I'm using JDev 10.1.3 EA.

You missing the point.
On a multi-user db knowing the next highest number doesn't guarantee the number will be available when it comes time to commit the record. You can prove this to yourself by opening two instances of your app and do whatever you do to add a new record to your VO. Both will assume the same number, and when you commit an error will be generated
You must use sequences to avoid the possibility of duplicate keys. If you are trying to avoid gaps in your numbering then you need to convince yourself why this is necessary.

ADF Entity Object

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