Create a entity object myself in a Parent class

1) I made 2 tables, a parent and a child.
2) I created entity classes out of them, and an association.
Now I want a method in the parent-class, where I create a child, belonging to the parent. How do I do that? I see no constructor, just a Create(), but what do I fill in for the attributelist, I guess the attributes :-) but how do these two objects reference to each other?
So I'm looking for something like this code in the Parent class:
public void addChild(String NameChild)
Child.create(NameChild, This)
Is this correct? Or not?
null

Are you looking for a Composition ie "Child" should be contained in a "Parent"?

Similar Messages

Error while creating new entity object.

Hi all
I'm using Jdev 11.1.1.3. I want to create an entity object and Jdev issues an information error saying "Either this is not a valid name or an object with that name already exists."
I found that if the package I'm targeting for the new entity is called "com.test.model.whatever" I cannot create a EO called "Whatever".
I can't find any reference in the fusion developer guide that constraints the entity names to be allowed.
Is there a way to circumvent this issue or is this the way it should be?

Sudipto and Suresh, thank you very much for your replies.
I know that changing the package or entity name would work, but was expecting some other kind of workaround, something like giving a full qualified name on some xml or something to avoid the name clash or whatever the problem is.
I do not like packing all the entities together as it goes against my best practice of packing things that change together on the same package. Also I don't like suffix or prefix class names as it goes against my best practice of short descriptive names.
So well, I will have to tinker the names some more and meet you guys half way.
I will now mark this thread as answered, thanks again.

How can we create an entity object using multiple tables?

Hi All,
I'm a newbie to OAF.
I'm trying to create a simple page using OAF.
While creating Entity object, there is an option to add the database objects from which we can create our Entity Object.
There we can enter only one database object.
If suppose I need to create a Entity object by using mutiple data base objects, how can I add other database objects?
Is there any option for multiple selection of database objects there?
Thanks in Advance

User,
a). You should use the [url http://forums.oracle.com/forums/forum.jspa?forumID=210]OA Framework Forum for this question.
b). Entity objects always correspond to a single table. I think you want to create a View object instead.
c). Really, you want to be using the OA Framework forum.
John

Is creating an entity object expensive for wrapping search values..

I am trying to create a very robust generic method that searches for entities that match the fields according to a enum of search types.
The easiest way I find is to wrap all the values into an instance of the entity class so that testing can be done on field values expected to be present.
So the question is if creating an entity object for the sole purpose of wrapping search values is considered expensive?

yawmark wrote:
User has the ability to search for a number by simply providing a number and then choosing to find all numbers that match, or especifically just a home, work or cell number that match.That requirement doesn't make any sense to me. Can you please elaborate on that use case? I understand phone number reverse look-ups, but those are typically looking for a person or business. One typically wouldn't search for a number by providing a matching number.
~But one could...
I think a point is being missed here and therefore I need to discuss a new design pattern I am using...
1) I create a entity class as per usual but I break a o-o rule with encapsulation. All of my fields are protected and not private. This allows me to create a subclass of the entity and inherit the members so that they can be used for the function of this class. The sole purpose of this subclass is to put an o-o framework around a String[] of search criteria provided according to the type of search to be done.
2) The method in my interface for finding is now extremely robust and is defined as follows...
@Local
public interface DBLocal<Entity, RecNo, T extends Entity> {
     * Retuns a List of all {@code <Entity>} records that match the search
     * criteria based on the type of search.
     * @param entitySub the entity subclass object that contains the values
     * to be used in searching. These values <b>must</b> be in
     * the correct fields in order for the search to be accurate. Eg: If a
     * request is done to search for all records that have names that match
     * according to a persons name, then a <code>getName()</code> method on
     * the {@code entity} subclass would be expected to
     * <ol>
     * <li> not return null
     * </li>
     * <li> Return the value "Tom" if the user wishes to find all records
     * that have the name "Tom".
     * </ol>
     * @param typeOfSearch the <code>SearchType</code> that is to be done.
     * @return a List of all {@code <Entity>} records that match the search
     * criteria based on the type of search.
     * @see phonebook.util.SearchType
     * @throws IllegalArgumentException if the search criteria provided is
     * incorrect for the type of search requested.
     * @throws DataAccessException if an underlying error causes the search to
     * fail.
    public List findBySearchType(T entitySub, SearchType typeOfSearch)
            throws DataAccessException;As you can see I am aiming for an interface that I can use as a utility class. Type T is a subclass of the entity that this interface is mostly being used for and will always be a subclass created specifically to hold the search data. The SearchType is an enum that contains an enumeration of the search types allowed.
Yes it may not be normal to provide a phone number and then search but I have seen this functionality where one can go online and do a search based solely on the number entered. Anyway I thing I found a design that is reusable now and my problem is solved.
Many thanks
Yucca
Edited by: Yucca on Jul 17, 2009 8:33 PM

Unable to create entity object in JDev 10.1.3(R12)

Hi,
I am Unable to create entity object in JDev 10.1.3(R12).Everything else works fine but not the EO creation.THe option for selecting table,synonym are disabled when I try to create new entity object.
Please let me know if you any of you had the same problem and resolved it.
Regards
Sudhakar

Sudhakar,
The (R12) in the thread subject line leads me to believe that you are asking this question in the wrong forum. OA Framework has its own [url http://forums.oracle.com/forums/forum.jspa?forumID=210]forum that you should use.
Best,
John

How to create Entity object for Non Database Object.

Friends,
I have a requirement something like, I will be getting some huge amount of data from external system via CORBA, I have to display the data in jsff page in <af:table>. My requirement is If User updates any of the row I need to identify what are all the rows user updated and Need to invoke again a CORBA call for only UPDATED Rows.
Basically here, I am not dealing anything with the Database, I assume using Entity we can find out a status of the row whether the row is updated/deleted/created .
How can I create an Entity object in this case.
Any help will be highly appreciated !!!
Thanks

The basics steps are described here http://download.oracle.com/docs/cd/E14571_01/web.1111/b31974/bcadveo.htm#sm0328
and here http://download.oracle.com/docs/cd/E14571_01/web.1111/b31974/bcadvvo.htm#sm0341
You need to change the underlying data source from pl/sql to meet your requirements (CORBA).
Timo

Creating Entity Object from Service Interface - JDeveloper version 11.1.1.3

In our project, we don't intend to have any JDBC connection to a database and want to create all my entity objects using SDO web services deployed in a remote server. I could create an entity object based on a SDO web service deployed in the standalone WL server successfully. But at the time of Development,when I select ADF Business Component --> Entity Object, it always takes to a screen that prompts for a JDBC connection, if you have no connection defined in the project yet. To bypass this, I need to create a valid connection to a local DB and then I can go the next page that prompts me to to choose service interface and asks for a WSDL URL. How do I get around creating a JDBC connection and create a service interface based data source directly?
To get around this issue, I created a connection to a local DB by providing a wrong password to make sure that we don't need a valid db connection. The application module (Business Component Browser) works fine when the DB connection is broken. But when I create a JSF page and put the data control there, if we don't have the DB connection established it gives error during deployment.I tried deleting the unused connection, but that gives a lot of errors during deployment. My question is;
1. How can I create a service interface based data source by-passing the requirement for a connection?
2. If that's not possible - how can I cleanly delete the JDBC connection and all it's dependencies, so that, it deploys and runs without error

Frank,
Thanks for your response.
I have made some progress in last two days and solved some of the original issues. I deleted the fake JDBC connection from connection.xml that I had to use to go to the second screen that lets me select the WSDL for the service interface. After that, I checked off the "Auto Generate and Synchronize ..." option from Application --> Application Properties --> Deployment. (thanks to Steve Muench's blog post on this subject). After that, I could deploy the JSF page and the page shows up with no problem.
However, when I try to run the App Module that was created from the WSDL (service interface), it brings up a pop-up with heading "Password Required" that says "Enter the password for" and asks for a user name and password (not sure what they are as they take any value and takes me to the next screen). After that, I can open the View and navigate through it. When i change some data and try to commit - it makes the change to the data and stores in the DB but gives an error saying "(oracle.jbo.NotConnectedException) JBO-25200: Application module is not connected to a database."
Also, the data control created from the service interface had operations called Commit and Rollback. I used the Commit on JSF page and that does the exact same thing too. Any idea?
Also - when we consume a SDO WSDL to create the entity object - how can we access the SOAP Request and Response objects? We have to implement WS-Security by instrumenting the SOAP header and need to get a handle on that. Is there a mechanism similar to JAX-WS handler framework for SDO?
R,
Chandan

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

How to create entity object (Business Component) using service interface

Hi,
I have tried to create one entity object (ADF Business Component) in JDeveloper 11g using service interface option instead of database schema but getting Failed to read service WSDL URL: http://....?wsdl message.
I have tried with axis default service Admin & Version wsdl and got same error message.
Regards,
Devang

Hi,
+"Oracle ADF Business Components application modules offer built-in support for web services and for publishing rows of view object data as service data objects (SDOs). This means that you can use an application module both as a local component and as a remotely accessible service, thereby using the same component to support interactive web user interfaces and web service clients. Entity objects that you create in your local Business Components project can utilize SDOs that the service-enabled application module exposes on its service interface."+
This means that you don't use Axis services but ADF Business Components Services. I am not sure this functionality made it in Boxer, but surely will in the next
Frank

How to create Entity Object when connecting JavaDB in Jdev 11g

I use Jdev 11g to connect JavaDB. When I use the BC4J wizard to create EO and VO, I only can see VO, the EO is empty.
any ideas?
Thanks

In the Application Navigator, right-click the project in which you want to create the entity object and choose New.
In the New Gallery, expand Business Tier, select ADF Business Components and then Entity Object, and click OK.
If this is the first component you're creating in the project, the Initialize Business Components Project dialog appears to allow you to select a database connection.
In the Initialize Business Components Project dialog, select the database connection or choose New to create a connection. Click OK.
On the Name page, do the following to create the entity object:
Enter the package name in which the entity object will be created.
Click Browse (next to the Schema Object field) to select the table for which you want to create the entity object.
Or, if you plan to create the table later, you can enter a name of a table that does not exist.
If you manually entered a table name in the Schema Objects field, you will need to define each attribute on the Attributes page of the wizard. Click Next.
When you are satisfied with the table object and its corresponding entity object name, click Finish

Can we create entity object based on a text file on the OS?

I understand you can interface with files using webDAV. Can we just create a entity object with source to a text/xml file on the OS instead of a table?

Have a look at the URL data source (under new->business tier->web services) - it allows you to create a data control based on an XML or csv file.
http://technology.amis.nl/blog/?p=1592
You can also create a data control based on a Java class that interact with a file.

Import POJO create Entity Object?

Is it possible to import a POJO and create an Entity Object + table from it?

Hi,
you cannot create Entity Object from POJO but you can use POJO based model to generate Data Control and work with it "like with Entity Object" in view layer.
example: http://www.oracle.com/technology/products/jdev/tips/fnimphius/pojopagination/index.html
regards,
Branislav

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.

How to add row in multiple view object based on common entity object.

Hi ,
I have
Jdeveloper version - 10.1.3.3.0
Oracle Database - 11g R2
I have a situation where i have to show data from one table in three adf tables on jsf page depending on a flag value in a column in table. For this purpose i have done the following steps
a) Created an entity object on the database table .
b) Created three view objects on this entity object and edited the view object's SQL and included the where clause
                   WHERE A.USER_PERSONAL_NO = :P_USER_PERSONAL_NO AND
                       A.AUTH_TYPE = 'LF'
                   The auth_type cloumn decided in which view object the data will be shown
Now, when i query the data from database by executing the query of these view objects the data is shown correctly in all three view objects. Till here there seems every thing ok
Now , i have to provide the logic to add records in the adf tables for this i have provided add button in action facet of all three tables which are binded to methods in managed bean,
when i add a record in a adf table by add button the new row which is created is shown in all three tables . I cant understand why this is happening , please help me to solve this problem.
How can i make it possible so that the record appears only in that adf table in which the record is added.
The method for adding record is
            Row rw = currentAM.getWfRecommAuths().createRow();
            rw.setAttribute("UserPersonalNo",this.getQuery_personal_no().getValue());
            rw.setAttribute("AuthPersonalNo","");
            rw.setAttribute("AuthType","LX");
            currentAM.getWfRecommAuths().last();
            currentAM.getWfRecommAuths().insertRow(rw);
           Please help , thanks in advance.

Hi,
have a look at polymorphic view objects
http://download.oracle.com/docs/cd/E21764_01/web.1111/b31974/bcadvvo.htm#CEGDCCCB
Frank

26.4 Basing an entity Object on a PL/SQL Package API - Ref Cursor, no View

I am hoping that I could get some help in the details of a problem. I am trying to follow the directions in the Oracle Application Development Framework Developer's Guide for Forms/4GL Developers, Section 26.4 - Basing an Entity Object on a PL/SQL Package API.
There is example code in the downloadable AdvancedEntityExamples - EntityWrappingPL/SQLPackage
The question is, how will the implementation change if the entity is based entirely on PL/SQL - simply stated - no view is available, just ref cursors and insert,update,delete procedures.
In the example code, there are two procedures, lock_product and select_product. This is where things get more complicated. I can create a function to return a single record ref cursor, instead of the list of OUT variables defined in both functions (select_product and lock_product). It makes sense that I just return one cursor and get all of the columns from that instead of lots of OUT variables.
So what's stopping me you may ask... There is one difference between select_product and select_lock. Select_lock has a select that includes "FOR UPDATE NOWAIT". I don't have that as an option when creating my ref cursor. I am not sure what the impact of "FOR UPDATE NOWAIT" is? Can I ignore it?
In the problem I am working with, (getting data from Oracle Portal 10.1.4) I return the following:
function getRefCursor return ref_cursor is
v_tab wwsbr_all_items_object_type := wwsbr_all_items_object_type();
p_recordset wwsbr_types.cursor_type;
l_results wwsrc_api.items_result_array_type;
begin
wwctx_api.set_context(<username>,<password>);
l_results := wwsrc_api.item_search(.. parameters..);
<snip>
... Loop through the objects and populate v_tab
<snip>
open p_recordset for
select * from table(cast(v_tab as wwsbr_all_items_object_type));
return p_recordset;
end getRefCursor;
With this sample, it would be easy to return a single row by passing the masterid as a parameter.
So I am still left with, how should the implementation of callLockProcedureAndCheckForRowInconsistency() and callSelectProcedure() be changed in order to use a ref cursor instead of a view? The user guide was missing that extra section <bg>.
What would be REALLY helpful, is an example, say 26.4A that demonstrates creating an entity object from a ref cursor and procedures from PL/SQL only without a view.
Thank you, Ken

The lock procedure is expected to obtain a row-level lock on the row, given its key.
Depending on the setting of jbo.locking.mode, the entity object's lock() method will be invoked either as soon as the first persistent attribute is successfully modified by the user (in the case of jbo.locking.mode=pessimistic), or it will be called during commit processing just before the row is updated in the database (with jbo.locking.mode=optimistic).
Usually 2-tier Swing applications use pessimistic mode, while web applications use optimistic mode.
The FOR UPDATE NOWAIT is the Oracle clause that can be appened to a SELECT statement to acquire a row-level lock on the selected rows. The NOWAIT modifier means that rather than hanging, waiting for a row locked by another user to free up, it will raise an exception if any of the rows being selected-and-locked are not available to lock.
If you're not able to work the FOR UPDATE NOWAIT into the syntax of the ref cursor, perhaps you can initially perform the lock using a different cursor inside the stored procedure, then return your ref cursor.

Create a entity object myself in a Parent class

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