Approach to designing model layer

Hi,
I am keen to understand different approaches/routes to be followed to design model layer of an ADF project.
As an example, the embedded URL shows the logical hierarchy strucutre of various business modules -
http://www.slideshare.net/AnkitGupta55/hierarchy-23178558
The logical structure will govern how the data will be shown to the user based on his selection of a value of in a top level LOV/Query component.
For Ex: if the user choose Child 1, then he should be able to see hierarchy : Main > Child 1 > Sub child 1
Every module in the diagram has a backend supporting table, however, the tables may not have the similar relationships. So a follow up query would be - Is it mandatory to have an identical table relationships as depicted in the diagram.
Also, request you to share suggestions on designing Entity Objects, View Objects etc.
JDeveloper Version - 11.1.2.4.39.64.36.1
Best Regards,
Ankit Gupta

Hi,
Every module in the diagram has a backend supporting table, however, the tables may not have the similar relationships
What do you refer to as module? The blocks as I see them can be treated as entities with associated VO. The relation between the two can be defined using entity associations or view links. Unfortunately its not easy to answer your question without knowing what you do know and what you don't know about ADF BC. Have you tried ADF (e..g running a tutorial) or have you only theoretical experience with the product. If you write ....
request you to share suggestions on designing Entity Objects, View Objects etc.
What exactly are you looking for and what does "etc." stand for in regards to the technology aspect it would represent? Entities and VO can be derived from an existing database infrastructure. If you don't have this, starting with teh ADF BC Diagrammer is a good way to start with. All documentation are accessible from otn.oracle.com/products/jdev
Frank

Similar Messages

How to design model for staging layer.

Hi expert,
what is the rule when design staging layer? such as how much layer needed for staging? and what objects used in staging? why different layers needed for staging .etc.?

Hi,
Please have a look at SAP Help - Enterprise Data Warehouse (EDW) for basic information around layers and architecture. Moreover, please have a look at my blog Layered, Scalable Architecture (LSA) from an Implementation Perspective - Overview where you can find several "accelerators" to facilitate your implementation.
Best regards,
Sander

Analysis, Design model, round-trip engineering

ok, here's the point.
We work with the problem domain and develop the analysis model. The analyst at this stage doesn't concern himself with the implementation details, some low-level code patterns and the programming language (well, let's forget for now about C's multiple inheritance and Java's workaround for it). So, when most of the analysis work is done, we end up with major classes (populated only with some basic attribs & behaviour; then, we have a high-level representation of business processes and corresponding activity diagrams. Of course, this model will be refined at a later stage, but for now it will do.
Say, we have the model in a project. Now we move to the design level. More and more details are added to the model, sequence/collaboration diagrams are added, we concern ourselves much more with the detailed class behaviour.
And here's the first question. Should we leave the original high-level diagrams intact and produce separate detailed ones? Generally, they represent the same process, but at a more detailed level. What about duplication of diagrams? Or should we elaborate the existing ones (but then we lose the clear and simple bird-eye view of the problem domain).
After that, we make a decision to implement the system as a set of EJB's. So, we've switch to component modeling at system design. UML model for these components differs quite a lot from a traditional one, so it can be quite painful to refactor the existing interaction diagrams. But do we need to do it? I agree that having <<EJBImplementation>>, <<EJBRealization>> , etc stereotypes displayed in the analysis model is not a nice solution.
Another question - is it a good idea to start a separate project for system design and just import/copy the required pieces from a higher-level design model? Or can we get away with combining all stages in one project file?
Please, read all of the above in the light of round-trip engineering. So, finishing after analysis stage, is not an option, but to lead the whole project to as low level as implementation details.
I'd like to hear from you, some hands-on experience with similar projects, your approaches. Feel free to comment on the flow of events.
Best regards,
Andrew

ok, here's the point.
We work with the problem domain and develop the
analysis model. The analyst at this stage doesn't
concern himself with the implementation details, some
low-level code patterns and the programming language
(well, let's forget for now about C's multiple
inheritance and Java's workaround for it). So, when
most of the analysis work is done, we end up with
major classes (populated only with some basic
attribs & behaviour; then, we have a high-level
representation of business processes and corresponding
activity diagrams. Of course, this model will be
refined at a later stage, but for now it will do.
Say, we have the model in a project. Now we move to
the design level. More and more details are added to
the model, sequence/collaboration diagrams are added,
we concern ourselves much more with the detailed class
behaviour.
And here's the first question. Should we leave the
original high-level diagrams intact and produce
separate detailed ones? Generally, they represent the
same process, but at a more detailed level. What about
duplication of diagrams? Or should we elaborate the
existing ones (but then we lose the clear and simple
bird-eye view of the problem domain).Depends on whether you are concerned about the abstract methodology or more concerned about the implementation methodology.
For full process control, on a large project, you will have a architecture design which will always reflect the target system but has little to do with the implementation design. If the architecture needs to change it means something was "wrong" with it (which could come about due to a change order or a refinement of the specification of the system.) There might be other associated high level documents which occupy the same level - such as the project plan. This would typically be the project initiation phase which occurs before software design starts.
Of course you would keep all of the documents. Just as naturally each version would be checked into the version control system.
>
After that, we make a decision to implement the system
as a set of EJB's. So, we've switch to component
modeling at system design. UML model for these
components differs quite a lot from a traditional one,
so it can be quite painful to refactor the existing
interaction diagrams. But do we need to do it? I agree
that having <<EJBImplementation>>, <<EJBRealization>>
, etc stereotypes displayed in the analysis model is
not a nice solution.I doubt that any reasonable system is going to make the decision to use J2EE in the system design process. That is always going to be a architecture or requirements decision (even if it is implicit.) If not then it suggests that there are probably at least three levels to the design process and the J2EE decision is in the top most layer (maybe there is a "high" and "low" level architecture process.) And architecture design must describe why J2EE was choosen and what if any alternatives were considered.
Again this document will be retained (and checked into version control.)
>
Another question - is it a good idea to start a
separate project for system design and just
import/copy the required pieces from a higher-level
design model? Or can we get away with combining all
stages in one project file?
In the abstract yes.
Why? Because in an ideal design environment, a "high" (system) level design is created by a small very experienced set of developers. Then it is handed off to many junior developers for "low" (detailed) design. That doesn't work if you are using the "same" design. This is only somewhat mitigated by design tools that somewhat support this process (or least last time I checked they didn't support it very well.)
Keep in mind that this is the ideal, and it is unlikely (probability wise) that you are working at or with a company where doing this is feasible much less encouraged.
Please, read all of the above in the light of
round-trip engineering. So, finishing after analysis
stage, is not an option, but to lead the whole project
to as low level as implementation details.
Round trip. You start with the documents that have been checked in. You branch the version control tree or just up the version numbers of the docs (depending on how "deliverables" are being handled) and start over.

What is the best MVC approach for designing Swing application

Hi...
I am designing an client/server application. In this I am using java swing for the front-end development. We decided on using MVC approach for the front-end design. I found that there are more than one approachs for designing in MVC.
Which is the best way to model. To create your model taking View into consideration or Creating the Model taking the tables into consideration.
Can anybody give help me out in this this is urgent. Thanks
sai

I'm not sure what you are asking, so I'll just ramble a bit and hope it helps.
Create your model taking the view and the data into consideration. :-)
Design a class to hold instances of the rows in your database that correspond (more or less) to the structure of the data. Add any needed methods to that data object to support the data that you might need for the view.
For example, suppose your database stores a name in two columns (firstname and lastname). You pull that data from the database into a collection of Person objects into your model. Your Person class has two fields (and set/get methods) to hold that data. Now, in your view, you want to display the name as one string, so add a method to the Person object to get the full name (just by concatenating the two data elements).
You have to take everything into consideration. How you are going to view the data as well as how it might be structured.

I am trying to use java file as Model layer and jsf as presentation layer

I am trying to use java file as Model layer and jsf as presentation layer and need some help
I successfully get the value of h:outputText from java file by doing simple binding operation but I am facing problems when I am trying to fill h:dataTable
I create java file
package oracle.model;
import java.sql.;*
import java.util.;*
*public class TableBean {*
Connection con ;
Statement ps;
ResultSet rs;
private List perInfoAll = new ArrayList();
*public List getperInfoAll() {*
perInfoAll.add(0,new perInfo("name","username","blablabla"));
return perInfoAll;
*public class perInfo {*
String uname;
String firstName;
String lastName;
*public perInfo(String firstName,String lastName,String uname) {*
this.uname = uname;
this.firstName = firstName;
this.lastName = lastName;
*public String getUname() {*
return uname;
*public String getFirstName() {*
return firstName;
*public String getLastName() {*
return lastName;
right click on the file and choose 'create data control'
then i wrote the jsf file:
*<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>*
*<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>*
*<f:view>*
*<h:dataTable id="dt1" value="#{bindings.perInfoAll}"*
var="item" bgcolor="#F1F1F1" border="10"
cellpadding="5" cellspacing="3" rows="4" width="50%"
dir="LTR" frame="hsides" rules="all"
*>*
*<f:facet name="header">*
*<h:outputText value="This is 'dataTable' demo" id="ot6"/>*
*</f:facet>*
*<h:column id="c2">*
*<f:facet name="header">*
*<h:outputText value="First Name" id="ot1"/>*
*</f:facet>*
*<h:outputText style="" value="#{item.firstName}"*
id="ot2"/>
*</h:column>*
*<h:column id="c4">*
*<f:facet name="header">*
*<h:outputText value="Last Name" id="ot9"/>*
*</f:facet>*
*<h:outputText value="#{item.lastName}" id="ot8"/>*
*</h:column>*
*<h:column id="c3">*
*<f:facet name="header">*
*<h:outputText value="Username" id="ot7"/>*
*</f:facet>*
*<h:outputText value="#{item.uname}" id="ot4"/>*
*</h:column>*
*<f:facet name="footer">*
*<h:outputText value="The End" id="ot3"/>*
*</f:facet>*
*</h:dataTable>*
*</center>*
*</af:document>*
*</f:view>*
but nothing is appear in my table
I know that there is something wrong in calling the binding object
I need help pls and where can i find some help to deal with another tag types
thanks

i dragged the "perInfoAll" from my "Data Controls" and choosed adf table (even I know that new table with adf tags well be generated and i want table with jsf tags)
and this code is generated
*<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"*
*"http://www.w3.org/TR/html4/loose.dtd">*
*<%@ page contentType="text/html;charset=UTF-8"%>*
*<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>*
*<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>*
*<%@ taglib uri="http://xmlns.oracle.com/adf/faces/rich" prefix="af"%>*
*<f:view>*
*<af:document id="d1">*
*<af:messages id="m1"/>*
*<af:form id="f1">*
*<af:table value="#{bindings.perInfoAll1.collectionModel}" var="row"*
*rows="#{bindings.perInfoAll1.rangeSize}"*
*emptyText="#{bindings.perInfoAll1.viewable ? 'No data to display.' : 'Access Denied.'}"*
*fetchSize="#{bindings.perInfoAll1.rangeSize}"*
*rowBandingInterval="0"*
*selectionListener="#{bindings.perInfoAll1.collectionModel.makeCurrent}"*
*rowSelection="multiple" id="t1">*
*<af:column sortProperty="uname" sortable="false"*
*headerText="#{bindings.perInfoAll1.hints.uname.label}"*
*id="c1">*
*<af:inputText value="#{row.bindings.uname.inputValue}"*
*label="#{bindings.perInfoAll1.hints.uname.label}"*
*required="#{bindings.perInfoAll1.hints.uname.mandatory}"*
*columns="#{bindings.perInfoAll1.hints.uname.displayWidth}"*
*maximumLength="#{bindings.perInfoAll1.hints.uname.precision}"*
*shortDesc="#{bindings.perInfoAll1.hints.uname.tooltip}"*
*id="it3">*
*<f:validator binding="#{row.bindings.uname.validator}"/>*
*</af:inputText>*
*</af:column>*
*<af:column sortProperty="firstName" sortable="false"*
*headerText="#{bindings.perInfoAll1.hints.firstName.label}"*
*id="c2">*
*<af:inputText value="#{row.bindings.firstName.inputValue}"*
*label="#{bindings.perInfoAll1.hints.firstName.label}"*
*required="#{bindings.perInfoAll1.hints.firstName.mandatory}"*
*columns="#{bindings.perInfoAll1.hints.firstName.displayWidth}"*
*maximumLength="#{bindings.perInfoAll1.hints.firstName.precision}"*
*shortDesc="#{bindings.perInfoAll1.hints.firstName.tooltip}"*
*id="it2">*
*<f:validator binding="#{row.bindings.firstName.validator}"/>*
*</af:inputText>*
*</af:column>*
*<af:column sortProperty="lastName" sortable="false"*
*headerText="#{bindings.perInfoAll1.hints.lastName.label}"*
*id="c3">*
*<af:inputText value="#{row.bindings.lastName.inputValue}"*
*label="#{bindings.perInfoAll1.hints.lastName.label}"*
*required="#{bindings.perInfoAll1.hints.lastName.mandatory}"*
*columns="#{bindings.perInfoAll1.hints.lastName.displayWidth}"*
*maximumLength="#{bindings.perInfoAll1.hints.lastName.precision}"*
*shortDesc="#{bindings.perInfoAll1.hints.lastName.tooltip}"*
*id="it1">*
*<f:validator binding="#{row.bindings.lastName.validator}"/>*
*</af:inputText>*
*</af:column>*
*</af:table>*
*</af:form>*
*</af:document>*
*</f:view>*
but when run it i see the following errors
*Class oracle.adf.model.adapter.bean.BeanDataControl can not access a member of class nl.amis.hrm.EmpManager with modifiers "private"*
*Object EmpManager of type DataControl is not found.*
*java.lang.NullPointerException*
*Class oracle.adf.model.adapter.bean.BeanDataControl can not access a member of class nl.amis.hrm.EmpManager with modifiers "private"*
*Object EmpManager of type DataControl is not found.*
*java.lang.NullPointerException*
:(

How to catch Exception in backingbean which is thrown from the Model layer.

Hi,
JDev Ver: 11.1.1.2.0
In my application there are two layer viewcontroller & model.
In model layer I have created JPA service facade which does the database operation like persist, merge & remove entity.
I am calling this service facade method from backing bean via below standard code.
public static Object invokeMethod(String methodName, String mapKey,
Object object){
BindingContext bcx =
DCUtil.getBindingContext((HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest());
JUFormBinding bc1 = (JUFormBinding)bcx.getCurrentBindingsEntry();
FacesCtrlActionBinding reassignOperationBinding =
(FacesCtrlActionBinding)bc1.findControlBinding(methodName);
if (mapKey != null && object != null) {
Map params = reassignOperationBinding.getParamsMap();
params.put(mapKey, object);
Object result = reassignOperationBinding.execute();
return result;
This is a static method which I am calling from backingbean to invoke service facade persist, merge or remove entity method
I have written throws in all the methods signature of service facade.
The exception which is thrown from the service facade are not comming back to backingbean catch block.
Is there any way to catch this exception in backingbean.
regards,
devang

Hi,
2 things to check
1 - does reassignOperationBinding has errors. You can check on the component
2 - does the exception show on the binding layet. See the Fusion Developer guide for how to define an error handler on the databindings.cpx file
Frank

Model layer customization are not reflecting on sandbox.

Hi
we are doing some changes to model layer in the seeded code, for the fusion apps.
But our changes are not reflecting on fusion apps instance, even those are small validation changes, and these changes are going fine on sandbox (xml file),
But when we are running the application these changes are not reflecting, do need to restart the server to get the model layer changes reflected.
Is there any way to debug our changes in the fusion apps instance.
Thanks
Vipin

But when we are running the application these changes are not reflecting, do need to restart the server to get the model layer changes reflected.
Is there any way to debug our changes in the fusion apps instance."
I am sure if you mean that it works after you restart the sever or you are asking if it will work on doing system restart.
In any case, model layer changes are always done at GLOBAL layer and these changes only reflect after restarting the application. So, server bounce is not needed but application restart is required for changes to be picked up.
Hope this helps
Thanks
Vik
http://blogs.oracle.com/fadevrel

Use of prepareSession() in Model layer

All,
In my Jdev 11gR1 application i want to know the use of prepareSession().
My use case is : Currently i am storing a lot of values in the session (View layer using HTTP, and Model layer using userData Map populated from my custom method).
Now my question is should i override the prepareSession() or using my my custom method is the right way.
thnks

Hi,
prepareSession is called with each request to the AM to allow developers e.g. to setup database context information for users (which you would do for label security). Surely there are other usecases as well
Frank

Problem about Reporting Model-layer Warnings to JSF

hi,
I have read not document article "Reporting Model-layer Warnings and Informational Messages to JSF [10.1.3.1]" the address is :http://radio.weblogs.com/0118231/stories/2004/09/23/notYetDocumentedAdfSampleApplications.html#101
and do it as it described,when I call it from concrete entity,it works very well,but when I put it in my base class,It can only displayed within bc tester,not a jsf page?what's the matter with it,how can i solve the problem?
thank you advance
lixinzhu
2007/09/17

Hi,
Thanks for your quickly reply.I debuged my code in the two mode,first I run my application in the business component browser ,all warning are displayed as I desired .(both in base entity clase SXEntityImpl and concrete entity class applicationUserImpl)but when I run my jsf page (which include the same view object),only warning added in my concrete entity(appicationUserImpl.java) displayed on the screen.
lixinzhu
2007/09/27

Sort order in the Busines Model layer

HI,
When you specify a sort order in the Busines Model layer, it is ignored on Pivot Tables. Can we please get Pivot Tables to use the sort order specified in the BM layer?
Thanks and Regards

-- Can we please get Pivot Tables to use the sort order specified in the BM layer?
If it doesn't work, please try to
1) add the column in pivot table on which the sorting is based.
2) hide it and
3) place it at the beginning in the rows section.

Link Join Concept In Physical and Business Model Layer

Hi,
As we know that we could make join relationship in physical layer and also business model layer in obiee 10g. This is what makes me confuse.
First of all, I tried to follow the tutorial in the oracle learning library center with schema SH as an example.
In the beginning, it is stated that we must make join relationship first in physical layer for all imported tables which are consist of dimension tables and fact tables.
Then, in the business model layer, the tutorial said that we must also make join relationship for the logical dimension table and logical fact table.
So, what's the purpose actually we must make join relationship in business model layer ?
All objects in business model layer are actually mapped from physical layer. So automatically the relationship in business model layer should be available automatically as they are mapped from physical layer.
Maybe for you guys who know the concept well about this difference of relationship, could tell me so I could get the idea of what it is actually about.
Thanks

Physical layer does represent datamodel joins as is in almost all cases.
Federated queries are a best example why joins are implemented in both (Physical & BMM layer) places.
Business model mapping layer is modelled according to your business requirements.
This is where your model MUST be a simple star schema, also where you model your hierarchies based on logical tables in bmm layer, & do appropriate aggregate navigation.
Hope the view points presented will put you in right direction.
mark answers promptly.
-bifacts
http://www.obinotes.com
J
Edited by: bifacts on Dec 16, 2010 9:19 PM

Implement QBE case insensitive search using model layer?

Using ADF 11.1.1.6.2
We know we can set filterFeatures='caseInsensitive' at UI layer to make QBE to search case insensitive.
How can we push that behavior using model layer implementation?
Thanks

Using ADF 11.1.1.6.2
We know we can set filterFeatures='caseInsensitive' at UI layer to make QBE to search case insensitive.
How can we push that behavior using model layer implementation?
Thanks

Is it possible to define a boolean as a checkbox at Model layer of JDev?

We are very new to JDeveloper and are using JHeadstart. We are a 'forte' shop and are converting our applications over to JDeveloper/JHeadstart. Our current system has a number of Boolean columns in our Oracle tables that are defined as Number(1) but are used as Booleans and displayed as checkboxes.
For example the column "discontinued" is in every edit table we have and keeps historical reference to values that are no longer used. I am wondering if it is possible at the Model layer to define all of these so that they are generated through JHeadstart to display as checkboxes. This is done at the BusinessModel layer in forte and allows us to define this in one spot and everything generated is based on that definition.
In JDeveloper, this is currently being done at the JHeadstart Application Definition each and every time one of these tables is used, but I was wondering if it can be done through the Control Hints level in the Model Layer so that it is done once (similar to forte) and have been looking at editting the formatinfo.xml file as a possible solution. Has anyone else done this? I have searched this forum and found a couple of things wrt title bindings, but not this specifically. Can this be done?
Thanks very much in advance.
Mary B
University of Windsor

I did some poking around and I believe I found what you were looking for. It can most easily be illustrated in the form of a screen capture - as a picture can save my fingers a thousand words...
http://cs.uwindsor.ca/~ruston7/checkboxdefn.png
This should be all the information anyone needs to know in order to implement the same set up in their own ADF Business Components.
Notes:
- 'DOMAIN' refers to the static domain I have defined throughout my JHeadstart applications to properly map the check box to yes/no (ref: JHeadstart Dev Guide for details).
- I am not sure what READ_ONLY_IN_TABLE is referring too. I am quite positive that this field is editable pretty much anywhere for this specific ViewObject.

Import Oracle Designer model dependencies between objects

Hello,
I am using the Oracle Designer model import to fill Data Modeler. There are some views which have dependencies on each other, resulting that views which depend on other views are incomplete.
Is there a way to rerun the import again in the same relational model, since the import utility now opens a new relational model again.
Is there a kind of logging where you can find these kind of errors?
Best regards,
Joop

Thanks Phillip, but I was actually referring to the version level of the Designer repository itself, not the database instance in which it resides. I seem to remember that you could not upgrade your Designer repository without also upgrading the Oracle Designer client as well; hence my question about compatibility between SQL Developer Data Modeler and various Repository versions.

Reporting model-layer warnings during renderModel (Steve #101 examaple)

Hi!
Everyone (almost ;) knows Steve's #101 example about reporting model-layer warnings to JSF.
It works good, but there is one caveat: it doen't report warnings ussied before prepareModel phase and after invokeApplication phase.
The first isn't a trouble, but the secons can turn in it.
For example, the entity has auto calculated field and in case of calculating want to inform user a value was changed.
In #101 i'му aded warning right in getDname() method:
getDBTransaction().getRootApplicationModule().addWarning(new JboWarning("getDname() warning"));
These warning doesn't appear on the first load to the testPage.jspx, inspite of it was added at model level during renderModel.
On second render the warning apperar but because getDname() called twice (why twice?) during process validation phase.
Does anybody faced the need of adding warnings at the renderModel phase? The cues will be apreciate...
Thanks.
Ilya Rodionov.

Hi,
Thanks for your quickly reply.I debuged my code in the two mode,first I run my application in the business component browser ,all warning are displayed as I desired .(both in base entity clase SXEntityImpl and concrete entity class applicationUserImpl)but when I run my jsf page (which include the same view object),only warning added in my concrete entity(appicationUserImpl.java) displayed on the screen.
lixinzhu
2007/09/27

Approach to designing model layer

Similar Messages

Maybe you are looking for