Logical to Relational mapping

Is it possible to define mapping between Logical and Relational objects (Entity->Table, Attribute->Column) manually?

no, it's not possible.
Philip

Similar Messages

Logical to Physical Mapping

Newbie to the Analytical Workspace Manager v. 11.1.0.7.0 and using Oracle Database 11g Enterprise Edition Release 11.1.0.6.0. Installed the global sample schema and associated objects. Created the workspace in AWM and I am able to see all cubes and dimesnion objects. I am now trying to do the logical to physical mapping of the dimension objects with the tables that I imported into the global schema. I right-click on the Channel dimension, but I do not see the Mapping option. I am unable to launch the mapping canvas. All I see is Maintain, Analyse, Set Security, Save, View Data and Delete. Am I missing something in the installation?
Thanks in advance for your help.
-ST

I also found that when I try to expand the "+" next to the Channel dimension, I get the following java error in the console.
Exception in thread "ExpansionThread" java.lang.NoClassDefFoundError: oracle/security/xs/XSPrincipalException
at oracle.olap.awm.navigator.node.olapi.UDimensionNode.getChildren(Unknown Source)
at oracle.olap.awm.navigator.node.BaseNodeModel.refreshData(Unknown Source)
at oracle.olap.awm.navigator.node.BaseNodeModel.dTreeItemExpanding(Unknown Source)
at oracle.bali.ewt.dTree.DTreeDeferredParent.__fireExpansionChanging(Unknown Source)
at oracle.bali.ewt.dTree.DTreeDeferredParent.setExpanded(Unknown Source)
at oracle.olap.awm.navigator.node.BaseNode.expandHelper(Unknown Source)
at oracle.olap.awm.navigator.node.BaseNode.access$400(Unknown Source)
at oracle.olap.awm.navigator.node.BaseNode$ExpansionThread.run(Unknown Source)
I am unable to view the defined hierarchies
Thanks.

Views always appear as different when engineering from Logical to Relational

I created some views in my logical model. After I engineer them to relational model, they appear in relational with an exclamation mark near the upper left corner. If I try to generate ddl for them, I get an error (-- ERROR: Invalid View VwTest). I realized that I have to "validate selected views", in order for the eclamation mark to disappear, and then I am able to generate ddl for them. After that, when I engineer from logical to relational again, it always shows me that my views are different. The difference is that in logical, my entities are shown between double quotes ("), while in relational, after the validation, the tables are not between double quotes. Is there a way to overcome this?
Thanks

Hi,
Thanks for reporting this problem. It appears that this is happening when the Entity name contains lower-case letters.
David

Need help in Object-Relational Mapping

I'm writing a simple two-tiered business application with Swing application on the client side and a DBMS on the server side. To make my client code more maintainable, I decided to create Business Objects instead of having my client accessing the database directly via SQL. For simplicity, I'm not using any features from the J2EE framework, and the Business Objects will be hosted on the client side, with one-to-one mapping to tables in the database. Since this is my first attempt in Object-Relational Mapping, I'm faced with the following problems:
1. What kind of methods are appropriate for business objects? For example, if I have a Machine and Employee entity. A Machine is owned by an employee, and this is represented in the DB by storing the employee ID (not the name) as a foreign key in the Machine table. Let's say in the user interface I have a table that needs to display the list of Machines, but instead of displaying the owner employee's ID, I want to display the owner employee's name by doing a join select. Should the findMachines() method always perform a join select to get owner's name and store it in the Machine object which is returned, or should findMachines() simply return the owner's ID so the UI will need to make another SQL call (through the Employee object) to get the employee's name? The latter is more elegant, but would it be horribly inefficient if there are lots of machines to be displayed (and for each machine we make a separate select call to get the owner's name).

Business objects should be separate from how they're persisted.
When you say object-relational mapping, do you mean a tool like Hibernate? Or are you writing your own persistence layer using JDBC and SQL?
I'd recommend that you read about the Data Access Object pattern and keep the persistence code out of the business objects themselves:
http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html
url=http://www-106.ibm.com/developerworks/java/library/j-dao/

Engineering (logical to relational) does not do name translation/variable population as expected

I am using OSDDM 3.3.0.747.
I have set up the following template formats, e.g.
Foreign Key: {table}_FK{seq nr}
Unique Constraint: {table}_UK{seq nr}
When I engineer from logical to relational model, I get generated names like the following:
{TABLE}_FK3
TENANTS_UK{SEQ_NR}
TENANTS_UK{SEQ_NR}v1
How do I stop this from happening?

Hi,
thanks for reporting the problem. I logged a bug for problem related to Unique constraint.
For foreign key - there is no variable {table} in template for FK. You can use {child} or {child abbr} instead.
As workaround for Unique constraint - you can apply naming standards for whole relational model - "Apply Naming standards for Keys and Constraint" in context menu for relational model in browser, or at table level - table dialog
Philip

Column Prefix from Logical to Relational Model

Hi,
is there any option, that data modeler append an prefix (table short name) to a column, when the logical model will be transformed to relational model? (Same behavior as Oracle Designer)
Example:
Logical Model
TABLE: PERSON
TABLE-SHORT: PERS
COLUMN-1: ID
COLUMN-1: NAME
Relational-Model
TABLE: PERSON
COLUMN-1: PERS_ID
COLUMN-2: PERS_NAME
Kind Regards,
Stefan

Thanks for your answer!
This Script is not really working for me, because of our foreign keys.
All our Foreign-Keys are named "ID" (for nummeric column) or "INDEX" (for a varchar column). After the transformation form logical to relational all the foreign-keys are named like "ID1", "ID2", "ID3", "INDEX1", "INDEX2" etc.
There is no way to apply this script before the foreign-keys where added in the tables?
The Second Way is to create a new script for this task.
am i the only one with this problem? :-/

Object services for Object relational Mapping

Hello everyone,
The Object Services of ABAP Objects can create the corresponding Object Model from existing database tables. Is it either capable to carry out an Object relational mapping, just like Hibernate does forJava.
Thanks a lot.

?

Need clarification - Object Relational Mapping

Folks
I have searched internet , but I could find a simple answer .
I am preparing for my Interview. I just want to reply for this question in a very simple answer
if the employer asked me what is Object Relational Mapping and Explain Cascade and the possible values .
The above question in the context of " Hibernate " .
I am not sure if this is the correct forum category I am asking , please guide me .
Thanks
Matt

The best simple answer is to say "I have no idea about those terms but I am eager to learn".
There is no simple answer that will give the impression you know about such stuff when you
don't, that will not expose you immediately to great embarrassment if they pose the simplest
followup question.

ANN: Eclipse EJB 3.0 Object-Relational Mapping Project Requirements posted

A document that presents an intitial feature and use case list for the early milestones of the Eclipse EJB 3.0 Object/Relational Mapping project has been posted to the project newsgroup (news://news.eclipse.org/eclipse.technology.ejb-orm). It also demonstrates a set of user interface components for editing EJB 3.0 Entities. The document covers the basics and is designed to illustrate the concept. It is in no way comprehensive. For example, it doesn't thoroughly cover the editing of ORM xml descriptors although this is an important requirement for the project. ORM xml support will be detailed in coming revisions, and slated for future milestones.
The purpose of this document is to invite comment on the approach. If you are interested in EJB 3.0 Entity support in Eclipse please give the doc a look over and post your feedback to the EJB 3.0 Object-Relational Mapping Project newsgroup.
Newsgroup: news://news.eclipse.org/eclipse.technology.ejb-orm
Simple Web Interface http://www.eclipse.org/newsportal/thread.php?group=eclipse.technology.ejb-orm
--Shaun Smith
Project Overview:
The goal of this project is to add comprehensive support to the Eclipse Project for the definition and editing of Object-Relational (O/R) mappings for EJB 3.0 Entity Beans. EJB 3.0 O/R mapping support will focus on minimizing the complexity of mapping by providing creation and automated initial mapping wizards, and programming assistance such as dynamic problem identification. The implementation will be extensible so third party vendors can add to its functionality.
Project Proposal:
http://www.eclipse.org/proposals/eclipse-ejb30-orm/index.html

A document that presents an intitial feature and use case list for the early milestones of the Eclipse EJB 3.0 Object/Relational Mapping project has been posted to the project newsgroup (news://news.eclipse.org/eclipse.technology.ejb-orm). It also demonstrates a set of user interface components for editing EJB 3.0 Entities. The document covers the basics and is designed to illustrate the concept. It is in no way comprehensive. For example, it doesn't thoroughly cover the editing of ORM xml descriptors although this is an important requirement for the project. ORM xml support will be detailed in coming revisions, and slated for future milestones.
The purpose of this document is to invite comment on the approach. If you are interested in EJB 3.0 Entity support in Eclipse please give the doc a look over and post your feedback to the EJB 3.0 Object-Relational Mapping Project newsgroup.
Newsgroup: news://news.eclipse.org/eclipse.technology.ejb-orm
Simple Web Interface http://www.eclipse.org/newsportal/thread.php?group=eclipse.technology.ejb-orm
--Shaun Smith
Project Overview:
The goal of this project is to add comprehensive support to the Eclipse Project for the definition and editing of Object-Relational (O/R) mappings for EJB 3.0 Entity Beans. EJB 3.0 O/R mapping support will focus on minimizing the complexity of mapping by providing creation and automated initial mapping wizards, and programming assistance such as dynamic problem identification. The implementation will be extensible so third party vendors can add to its functionality.
Project Proposal:
http://www.eclipse.org/proposals/eclipse-ejb30-orm/index.html

Logical vs relational

hi,
There are two notations in logical model (Barker and Backman).
The Backman notation in logical model looks like relational model in look and feel.
I want to know the difference between logical and relational in oracle data modeler.
How can i correlate with design theory like (conceptual, logical, physical) ??
regards

It does depend on how you define conceptual and logical.
I always use Barker notation for conceptual and logical as the diagram does not look like the relational/physical model diagram plus it allows me the option of using box-in-box to represent subtypes and to display relationship verbs phrases on the relationship lines. This helps when reviewing with the business.
For me a conceptual model will only have primary entities without attributes (but occasionally with natural keys), and unresolved many-to-many relationships. For a logical data model I will add all attributes, UIDs, datatypes (domains), null/not null flags, resolved intersection entities for the M:M, and reference/lookup entities.
I prefer the Barker notation because it does not show the inherited attributes from the relationships which helps me remember I am doing an entity relationship model not a database or implementation design. I then can forward engineer the logical to a relational model for Oracle or SQL Server (etc). One thing that forward engineering does is to covert the logical data types to the correct physical data types for the selected database. It also creates the PK and FK constraints that can then be generated into DDL to build the tables. You also have options on how to implement the logical subtypes (single table, separate tables, master table with siblings, etc)

Eclipse Relational Mapping + wrong name exception

Dears,
I wanna ask three questions:
- I understand that TopLink will be replaced by EclipseLink. EclipseLink will have JPA + Relational Mapping? or the Relational Mapping is there only for backward compatiblity and all new products should use EclipseLink JPA?
- Is there any EclipseLink discussion forum?
- I am using EclipseLink + EJB 3.0, I am getting the following Exception:
[EL Finest]: 2009.03.08 14:07:18.453--ServerSession(27076478)--Thread(Thread[OC4J Launcher,5,main])--java.lang.ArrayIndexOutOfBoundsException: 27233
     at org.eclipse.persistence.internal.libraries.asm.ClassReader.readClass(ClassReader.java:943)
     at org.eclipse.persistence.internal.libraries.asm.ClassReader.accept(ClassReader.java:259)
     at org.eclipse.persistence.internal.weaving.PersistenceWeaver.transform(PersistenceWeaver.java:85)
     at com.evermind.server.ejb.persistence.PersistenceUnitInfoImpl$ClassPreprocessorWrapper.processClass(PersistenceUnitInfoImpl.java:392)
     at oracle.classloader.util.ClassPreprocessorSequence.processClass(ClassPreprocessorSequence.java:116)
     at oracle.classloader.PolicyClassLoader.defineClass(PolicyClassLoader.java:2222)
     at oracle.classloader.PolicyClassLoader.findLocalClass(PolicyClassLoader.java:1462)
     at oracle.classloader.SearchPolicy$FindLocal.getClass(SearchPolicy.java:167)
     at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119)
     at oracle.classloader.PolicyClassLoader.internalLoadClass(PolicyClassLoader.java:1674)
     at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1635)
     at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1620)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     at java.lang.Class.getDeclaredMethods0(Native Method)
     at java.lang.Class.privateGetDeclaredMethods(Class.java:2365)
     at java.lang.Class.getMethod0(Class.java:2611)
     at java.lang.Class.getMethod(Class.java:1579)
     at com.evermind.server.ejb.LifecycleManager.buildLifecycleMethod(LifecycleManager.java:353)
     at com.evermind.server.ejb.LifecycleManager.initialize(LifecycleManager.java:319)
     at com.evermind.server.ejb.deployment.BeanDescriptor.initialize(BeanDescriptor.java:293)
     at com.evermind.server.ejb.deployment.ExposableBeanDescriptor.initialize(ExposableBeanDescriptor.java:173)
     at com.evermind.server.ejb.deployment.SessionBeanDescriptor.initialize(SessionBeanDescriptor.java:225)
     at com.evermind.server.ejb.deployment.EJBPackage.initialize(EJBPackage.java:995)
     at com.evermind.server.ejb.EJBContainer.postInit(EJBContainer.java:852)
     at com.evermind.server.ApplicationStateRunning.initializeApplication(ApplicationStateRunning.java:217)
     at com.evermind.server.Application.setConfig(Application.java:438)
     at com.evermind.server.Application.setConfig(Application.java:339)
     at com.evermind.server.ApplicationServer.addApplication(ApplicationServer.java:1895)
     at com.evermind.server.ApplicationServer.initializeDeployedApplications(ApplicationServer.java:1651)
     at com.evermind.server.ApplicationServer.setConfig(ApplicationServer.java:1034)
     at com.evermind.server.ApplicationServerLauncher.run(ApplicationServerLauncher.java:131)
     at java.lang.Thread.run(Thread.java:595)
09/03/08 14:07:18 WARNING: Application.setConfig Application: current-workspace-app is in failed state as initialization failed.
oracle.classloader.util.AnnotatedNoClassDefFoundError:
     Missing class: com.its.tabs.ptf.ugm.dal.group.GroupEntity (wrong name: org.eclipse.persistence.internal.libraries.asm.attrs.LocalVariableTypeTableAttribute)
     Dependent class: com.its.tabs.ptf.ugm.dal.group.GroupEntity
     Loader: current-workspace-app.root:0.0.0
     Code-Source: /D:/dev/TopLink11g-JPA/Platform/classes/
     Configuration: <ejb> in unknown
The missing class is not available from any code-source or loader in the system.
For sure I am not using any Arrays in my Entity.
Thanks
Edited by: Javatizer on Mar 8, 2009 5:11 AM

Javatizer wrote:
- I understand that TopLink will be replaced by EclipseLink. EclipseLink will have JPA + Relational Mapping? or the Relational Mapping is there only for backward compatibility and all new products should use EclipseLink JPA?We have transitioned our development to open source with EclipseLink offering JPA as well as continued support for our native relational mappings. The TopLink product continues to exist as Oracle commercial offering including EclipseLink. Those wanting professional support for their use of EclipseLink can get it through licensing of Oracle TopLink. In addition to the inclusion of EclipseLink our TopLink product also includes the original packaging of TopLink for backwards compatibility (including utilities) and TopLink Grid (Coherence integration).
Customers using TopLink's native relational mappings can upgrade to using EclipseLink's packages (using the package renamer) and continue to leverage the same functionality they are used to. As we add new features we endeavor to make them easily usable through the JPA interface but the native usage is always available.
Javatizer wrote:
- Is there any EclipseLink discussion forum?
There is a newsgroup and mailing lists hosted at eclipse.org - http://www.eclipse.org/eclipselink/community.php
Javatizer wrote:
- I am using EclipseLink + EJB 3.0, I am getting the following Exception:
I would recommend filing a bug for this issue. I'll ask some others to take a look as well to see if they have seen this.
Doug

NetWeaver Object/Relational Mapping tool

I've read the nice article <i>Using Hibernate on SAP WAS</i> by Peter Mayringer:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/2ae0614a-0601-0010-a491-a9a635f06613
Just a curiosity: Is there a SAP's proprietary NetWeaver Object/Relational Mapping tool, similar to the Hibernate open source project?
Davide

Hi Davide,
SAP doesn't have proprietary O/R tool but it supports JDO 1.0 standard and Entity Beans as part of J2EE 1.3.
Regards,
Avi

Which object-relational mapping tool is the best for Oracle Coherence?

Which object-relational mapping tool is the best for Oracle Coherence?
My application is read-and-write-intensive. Which tool is most suitable for this application?
TopLink essentials, TopLink, Eclipse or Hibernate?
Thank you

I would pick Hibernate mainly because of its popularity and wide knowledge base.
Coherence has provided some documentation for the integration.
http://download.oracle.com/docs/cd/E14526_01/coh.350/e14537/usehibernateascoh.htm#CEGFEFJH
If you have the schema in database, myEclipse can provide you hibernate bindings by reverse engineering.

Enhydra DODS - Open Source Object/Relational Mapping Tool from Enhydra

Hi all,
I just want to inform you that the final version 5.1 of DODS is released.
Data Object Design Studio is an open source Object/Relational mapping tool.
Based on XML data model descriptions (DOML files) SQL DDL, sophisticated Java O/R code and documentation (HTML, pdf, XMI) is generated automatically using a generator GUI, by Ant tasks or from within your IDE of choice (using Kelp).
The generated Java code provides a lot of possibilities for runtime optimization (DO LRU caching, Query LRU caching, cache initialization, lazyloading,...).
DODS can be used with or without the Enhydra application server.
DODS Development Team
Home page http://dods.enhydra.org
Objectweb project http://forge.objectweb.org/projects/dods
Download page http://forge.objectweb.org/project/showfiles.php?group_id=61

Hi Davide,
SAP doesn't have proprietary O/R tool but it supports JDO 1.0 standard and Entity Beans as part of J2EE 1.3.
Regards,
Avi

(264361962) Q XMLM-26 Is it possible to insert some logic in XML maps?

Q<XMLM-26> Is it possible to insert some logic in XML maps?
A<XMLM-26> Since you have the flexibility to defined the map yourself then yes, you
certainly can provide some logic. For more complex situations Workshop also provides
you with the flexibility to use an extended version of ECMAScript (formerly JavaScript)
to perform XML mappings. You can find out more at e-docs:
http://edocs.bea.com/workshop/docs70/help/guide/howdoi/howUseECMAScriptJavaScripttoProcessXMLMessages.html
Adam

Yes, you can make any kind of logic in LV. Some would say even illogic. To implement a latch or any other logic with memory you can use a while loop with a shift register. If the shift register is uninitialized (nothing wired to the left terrminal from outside the loop), it will retain the previous value. You can use case statements to control when various pieces of the logic execute. It would not be difficult to construct a flip-flop which could be type D or JK or T depending upon the value of and input selector.
Lynn

Logical to Relational mapping

Similar Messages

Maybe you are looking for