BC4J/UIX: Multiple Application Modules / Database Connections

My UIX application must have access to two databases. One is the main database for the application and the other contains lookup information. The lookup database is shared by many applications of different types. I need to display values in the UIX page and also create a composite view from tables in each database.
My understanding of this is that a UIX page requires a root Application Module which can have nested application modules allowing construction of a complex application. It appears that a UIX page must be tied to the root Application Module and then the nested modules can be referenced and used later in the UIX page.
Can I create a root Application Module that contains a nested application module that connects to a different database? If so, are there limitations in building associations between the AM's that use different databases?
If this is possible, how do I do it? I have created separate projects: one for each of the databases I mentioned and one for the main application module in a separate project. I try to create a "New Business Components Package" and "EJB Entity Facades for existing Entity Beans". The two application modules do not appear. (I created jar files for each of them and referenced these as libraries in the root module project.) Is this the correct approach? I have not found documentation that shows me how to do this yet so I admit I could be completely off base.

Okay, I figured out that I have to build all of the BC4J packages under the same project and that the EJB Entity Facades is not what I should be working with.
Maybe I will figure out the rest before too long.

Similar Messages

Question about multiple application modules.

Hello,
Suppose I have 2 database schema’s. For both schemas I have 1 application module. All view objects are in the same project.
For each application module I have an application definition.
Is it possible to link between these two applications? Because sometimes these database schema’s link to each other and you would like to jump from one application directly to the other.
For example you have orders locates in 1 DB schema and customers in another DB schema.
You would want to jump from the order directly to the customer details in the second schema.
Is this possible? Or do I need to make nested application modules etc?
I can find very little info about this; the JHS def guide does not offer much information about multiple application modules etc.
-Anton

Anton,
Yes, you can jump aroundd as you like.
You just can't use view links between VO's based on different db schema tables.
Nesting AM's doesn't help there, the DB connection of the top-level AM will be used.
Why don't you create synomyms for the tables in the other schema?
Steven Davelaar,
JHeadstart Team.

AIR application and database connectivity (using JAVA)

Hi
I am creating AIR application and I want to connect with the database using java database connectivity (JDBC).
Can any body give me the some suggestion on how to how to do that.
Please give me any reference for creating AIR application for database connectivity with mysql/access.
Thanks
Sameer

lots of serching on the google and found that For AIR applications either you use Webservices(JAVA/PHP/.Net) or you can use SQLLite.
Not found any method for direct connectivity with the database using JDBC.
If any one found direct connecivity withe database using JAVA then please reply.
Thanks

Creating an Application module not connected to any database

Hi,
In my application, we have only a custom VO, created as per http://download-west.oracle.com/docs/cd/B31017_01/web.1013/b25947/bcadvvo008.htm. In this VO, we are reading a CSV file.
My question is, as my application does not require any database as its source, I dont want to have any database associated with my ADF application. However, when I create the AM, it doesnt let me go ahead till I give it a database connection. Is there a way to circumvent this, or remove the database connection related code after creating the AM in this way.
Thanks,
Amit

Wow, beautiful...just what the doctor ordered !
Thanks John !
One note, for people who try this - in the link, Lucas is using http://127.0.0.1:8988 etc to specify the url to the csv...but i guess for that to work, you need to have some kind of web server running.. But if you just have a local file and right now, no web server to use 127.0.0.1, you can use file:///c:/test.csv, where the csv is sitting in c drive.
I got this idea from http://www.oracle.com/technology/products/jdev/howtos/urldatacontrol/urldatacontrol.html...this one is cool too, here they have used this url data control to read rss !

Multiple Application Modules

I'm currently working on a BC4J/Struts project that requires accessing multiple disparate databases.
I've setup 2 separate BC4J projects, one is the primary project that the Struts project uses as it's application module (Stateful). The secondary BC4J project is accessing a different database (Stateless).
I've created methods in the primary application module to access the secondary application module. I'm currently using the Configuration.createRootApplicationModule() method create an instance of the secondary application module within the primary application module.
Is there anything wrong with this approach?
How have others achieved this?
Thank you.

Hi,
Configuration.createRootApplicationModule will use the ApplicationPool (caching mechanism). This is intended for programmatic use and is okay to use when accessing a different root AM from within another AM. Please note that this will set up a different transaction context in the second AM that will not be nested within the first (i.e. the framework will not commit the second when commiting the first). If this is not the desired architecture then you should nest the second AM rather than using a programmatic approach.
You should always release the second AM when done. Best practice recommends that the createRootApplciationModule...releaseRootApplicationModule pair are performed in a try...finally block. If you release with the remove parameter=false -- will release the AM to the pool for reuse.
Hope this helps,
JR

Bc4j, jsp, oracle9ias appl - inreasing database connections

Hi,
I have a BC4J application developed in jdev 3.1, front end is jsps. the application is deployed on oracle9ias. The application is in statleful mode.
As application users connect to the application, the number of database sessions keeps on increasing, and not freed even when the browser is closed and the http session ends.
How can we release these sessions from the database (so that v$session does not show them anymore).
Aparna.

By default BC4J uses a connection pool to reuse JDBC connections. Once an application module is disconnected the JDBC connection is rolled back and then returned to the connection pool instead of being closed. This is why the sessions continue to appear in the v$session table.
Please see the BC4J connection pooling documentation for more information about configuring the JDBC connection pool. You may be interested in setting a max JDBC connection pool size.
.

Use 2 App modules with connection to 2 databases on 1 UIX page?

Is it possible use 2 different Application modules with connection to different databases on one UIX page?
Thank you.

Yes.
Use a <bc4j:registryDef> with two <bc4j:rootAppModule>'s inside. Everything else is the same as the single root application module case.
More documentation is available in the UIX Developer's Guide available in the JDeveloper help system and online at:
http://helponline.oracle.com/uix/help/
Kind Regards.

Root Application Module connecting to 2 databases technologies

I have an application which needs to connect to 2 different databases.
I managed to get access to each databases in their own respective Application Modules.
In order to achieve that, I created a new ViewObject within the "oracle" model, and still used the "MySQL" query. Using the jbo.envinfoprovider property, I can force the Application module to connect to the appropriate database, MySQL in this case.
Now, my problem is that I need to have a Root application module that will use BOTH "child" application module and eventually BOTH database connections. At the moment, I can only use one at a time. Using the jbo.envinfoprovider property of the ROOT application module allows me to select which of the 2 database I want to use, but I need both.
To put it in a tree-like structure, here's what I want to achieve :
ROOT (Oracle + MySQL)
|
|__ AppModule1 (Oracle)
| |
| |__ View1
| |__ View2
|
|__ AppModule2 (MySQL)
|
|_ View3

What I mean is if I deploy the application on the integrated weblogic server, using the default navigation flow defined in the adfc-config.xml file, when I reach the "forensic" page, it will try to "read" from both database and fail at reading the second database.
The page displays the following :
1- a table containing the records from the Oracle database (3 columns=> ID, pattern, solution)
2- an adf_form used to populate the above table :
- the ID is bound to a database trigger, so is set to readonly
- the solution is a text input field
- the Pattern is a LoV, based on the data found on the MySQL database.
If I test the page from the "forensic.jspx" itself (by right-clicking and selecting "Run"), I can manage the data just fine (I can do any CRUD operations I want)
on the other hand, if I go to the "adfc-config.xml" file and (right-click and then select "Run"), the page will only read one of the two database (I can control which one, by changing the jbo.envinfoprovider property of my application module)
Hope this helps understand what I am trying to achieve.
Thanks !

How do multiple developers share the same application module

Is there a suggested method for multiple developers to share the same application module? We have 2 developers that will have EOs in the same directory and would like to know how they can share an application module but do development on different pieces of a project.
Thanks,
Paula

Try using CVS or any other source control system. Still there are some points to think about before doing big projects, because there are many files which are updated by JDEV without knowledge by the developer. This causes many conflicts using a version control system like CVS.
If you developers both are working on the server part of the application, I suggest using multiple application modules. See this blogs:
http://radio.weblogs.com/0118231/stories/2005/05/27/howGranularShouldMyApplicationModulesBe.html
http://radio.weblogs.com/0118231/stories/2005/07/19/nestedApplicationModules.html
On the client side it depends on which technology you are using (struts, swing, jsf, ...).

TP4 [ER] / icons in application resources for database connection

It would be nice to show active connections by differencing the icon in the application resources database connections. Contextual menu to disconnect the session is enabled/disabled but you have to expand each connections to see it.

I think this is a no-go, since you cannot retrieve a cleartext password from the OID if I'm correct.

How to immediately released database connection in jclient form app ?

Hello Steve,
We want our jclient form application could immediately released database connection when its be closed,
We had follow your Weblog technical paper about http://radio.weblogs.com/0118231/stories/2005/02/10/amPoolingConsiderationsForAdfJclient.html , it mentioned following step to release Jclient database connection, but in our jclient project when we close separate jclient form application the database connection seems not immediately released(we monitor through TOAD trace session), the database connection will continue stay alive until we close the all project application.
Call panelBinding.releaseDataControl() method before our form application closed,
Set the AM pool's minimum available size to 0 (zero), and set the idle time and pool monitor interval shorter if the up-to 20-minute wait (in case it takes two wakeup cycles for the AM instance to be idle more than its idle time) is not something you like, or
Disable AM pooling altogether (jbo.ampooling.doampooling=false)In our project application the database connection behavior like following:
1.when we open every Jclient form application , it will establish a new database connection for every form application
2.But when we closed the jclient form application , the database connection still exist
3.But when we open the same jclient form application again, the database connection will not create new database connection , it seems using the same connection when this application first create.
4.when we close the all project application , it will release all database connection.
Could you help us, thanks.
Sincerely from, TIng-Rung

Hello Steve,
We have been study the paper that you mentioned, sorry that we still got some confused about AM pool and jdbc pool, My project bc4j,xcfg like following , could you help us what we missing ?
==============================
<?xml version = '1.0' encoding = 'UTF-8'?>
<BC4JConfig>
<AppModuleConfigBag>
<AppModuleConfig name="xxxAppModuleLocal">
<jbo.ampool.maxinactiveage>5000</jbo.ampool.maxinactiveage>
<user>xxx</user>
<jbo.project>His</jbo.project>
<AppModuleJndiName>com.xxx.business.module.xxxAppModule</AppModuleJndiName>
<DeployPlatform>LOCAL</DeployPlatform>
<jbo.poolmonitorsleepinterval>10000</jbo.poolmonitorsleepinterval>
<jbo.poolmaxinactiveage>5000</jbo.poolmaxinactiveage>
<JDBCName>NEWNTUHRIS</JDBCName>
<RELEASE_MODE>Stateless</RELEASE_MODE>
<jbo.recyclethreshold>0</jbo.recyclethreshold>
<ApplicationName>com.xxx.business.module.xxxAppModule</ApplicationName>
<java.naming.factory.initial>oracle.jbo.common.JboInitialContextFactory</java.naming.factory.initial>
<password>xxxx</password>
<jbo.poolminavailablesize>0</jbo.poolminavailablesize>
<DBconnection>jdbc:oracle:thin:@10.0.0.8:1521:xxx</DBconnection>
<jbo.ampool.minavailablesize>0</jbo.ampool.minavailablesize>
<jbo.ampool.monitorsleepinterval>10000</jbo.ampool.monitorsleepinterval>
</AppModuleConfig>
</AppModuleConfigBag>
<ConnectionDefinition name="xxx">
<ENTRY name="JDBC_PORT" value="1521"/>
<ENTRY name="ConnectionType" value="JDBC"/>
<ENTRY name="HOSTNAME" value="xx.xx.xx.xx"/>
<ENTRY name="DeployPassword" value="true"/>
<ENTRY name="user" value="xxx"/>
<ENTRY name="ConnectionName" value="xxx"/>
<ENTRY name="SID" value="xxx"/>
<ENTRY name="password">
<![CDATA[{904}0505E5FED797881374FDE8BD1606B6CF01]]>
</ENTRY>
<ENTRY name="JdbcDriver" value="oracle.jdbc.driver.OracleDriver"/>
<ENTRY name="ORACLE_JDBC_TYPE" value="thin"/>
<ENTRY name="DeployPassword" value="true"/>
</ConnectionDefinition>
</BC4JConfig>
and our jclient code to release connection like following:
tabbedPane.addCloseListener(new CloseListener(){
public void closeOperation(MouseEvent e){
cleanTabComponentListener(tabbedPane.getComponentAt(tabbedPane.getOverTabIndex()));
tabbedPane.remove(tabbedPane.getOverTabIndex());
UPanelBinding panelbd = tabbedPane.getPanelBinding();
panelbd.releaseDataControl();
panelbd.getBindingContext().release();
}

BC4J HOW Can I GET the CONNECTION String

hi everyone
I'm using Jdev 3.2. In my BC4J prooject I want to get the current connection String used by the application module to connect to database.
can some one help me please.
Ghassen

I don't know what's really the problem, but I recomplie the same code and I receive the same error.
I added also the import statement: import oracle.dacf.dataset.connections.NamedConnection.
and I receive the same error message.
can that be a mising library problem?
ghassen
null

Application Module Data Source problem

I have a project which has multiple App Modules (AM). I have deplyed the application on Tomcat 5.5. The database connection is configured as DataSource. When I start the application the first app module connects to the database and works properly but when I go to page which refers to some other AM, it throws an error (SQL Exception unable to create Connection pool ). Is it possible for other AMs to use the datasource used by the first AM?

Refer
Multiple Application Modules with 1 Connection?
Configure multiple Application Modules

Application Module retrieves different data than direct DB query

Hi,
I am using JDeveloper 1.1.1.6
I have a big headache trying to figure out why my application Module is retrieving different data than if I execute the query of my ViewObject directly to the data base. To prove me that I am not crazy I have created a non updateable view object based in this sql query
select * from hr_lookups;
The application module is connecting to the database using JDBC URL Connection localhost:1529/DB and user name apps. When I run the application module I can see rows and everything as expected.
If I connect to the same database using the same username, when I execute select * from hr_lookups; I get no rows!!!!
I don't know what else to do and I really will appreciate your help in this one.
Kind Regards

Hi Timo,
Thank you for your reply. Yes, I can see the exact same query. In fact all the rows are the same except one column. One attribute which is coming from a stored procedure. By this I mean the view object has the following structure;
select att1, att2, ... , mypackage.myprocedure(param1,param2) from tables where clauses;
So att1, att2, etc are the same whether I run the appModule or I copy and paste the query in a SQL WorkSheet and run it. The only different is the results of mypackage.myprocedure(param1,param2). So I have created a new view object from SQL query;
select mypackage.myprocedure(param1,param2) from dual. From application module it returns one value and directly from SQL WorkSheet returns different value...
Im sorry if I am not understandable but I am really desperate. Might it be permission or something like that???
Regards

Application Module Nesting Performance

I have multiple application modules and it is currently nested to one main application module.Due to the complexity of my logic, I would like to refactor it further but I cannot move it outside the root application module because the instance of the other services is invoked by
rootAppModule.findApplicationModule("childAppModule"),
If I move it outside the root application module, do we have a performance issue by using createApplicationModule whenever I access the application module?

It's hard to say in general if you'd have a "performance issue", but what I can say is moving it to be its own top-level application module would mean:
-> An extra/different JDBC connection instance
-> An extra/different entity cache
So that might translate into slower performance, but it's always worth doing some benchmarking of exactly what you have in mind to see if for your circumstance the use would incur unwanted overhead or be negligible in the big picture.

BC4J/UIX: Multiple Application Modules / Database Connections

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