Virtual Primary Key on Model

Hello,
I would like to put CDC on a table in an Oracle DB (for the Siebel application). The physical table does not have a primary key defined; however the field row_id does qualify for the constraint. I don’t want to apply a primary key at the DB… Siebel has its ways of doing things and I don’t wish to interfere.
I read here... http://www.oracle.com/technology/pub/articles/rittman-odi.html ... about having “Oracle Data Integrator enforce them ‘virtually’”. Is there such a thing as a virtual primary key constraint that can be created within the ODI metadata or must I create it at the physical DB table level?
Another thought… would it be possible to create a view on top of the table with a primary key constraint?
Thanks in advance!
Nate

In the model:
Expand the datastore on which you want to create this PK constraint.
You will see "Constraints" in the hierarchy.
Right-click and select "Insert Key". Select it to be PK. Specify name and then the columns.
Uncheck "Defined in DB".
I hope you are familiar with the creation of the interfaces.
In the Projects -> Interface, where you are moving the data into this datastore:
You will need to select a CKM Oracle for checking the constraint.
And run the interface.
You will see the rows that violated the PK constraint listed in the E$ table

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Hi Everyone:
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Frank:
I thank you for your reply.
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UofW

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Hi,
I use JDeveloper exclusively for data modelling and generating the sql to build my db.
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Is this a known issue?
Cheers
Rakesh

Is this forum meant for reporting bugs or not? This issue i have stated is repeatable and in the current version.
R

SQL Data Modeler 3.0 EA1 trying to create primary key on OT

Hi,
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Scott K

Hi Scott,
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Physical Model - Primary Key changed

I have a report called 'Service Report' running fine. This report uses multiple tables like Service,Specification etc...
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Kavi

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Setting Primary Keys in Data Modeler

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How to create tabular form whithout primary key in table

Hi All,
I have requirement to create a tabular form but the problem is, the table which I am using in the application don't have any Primary key, I am using only one table can't change any thing in table.(i.e can't add any row in table,no change in data model)
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looking forward for all of your quick responce.
Thanks in advance.
Dikshit Kumar Nidhi

You can create a view like
select a.rowid id, a.*
from table a
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http://htmldb.oracle.com/pls/otn/f?p=24317:159
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Thanks

How do I create an Entity Bean with unknown primary keys

Hi,
Can a good folk help me.
I am mapping an entity bean to an oracle table for the purpose of logging . I do not need a primary key contraint on this table. How do I specify in my entity bean file descriptor not to use any field for primary key ...
I have done this so far...
in my ejb.xml file - I set....
<prim-key-class>java.lang.Object</prim-key-class>
and deleted ....
<primkey-field>...</primkey-field>
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CREATE TABLE FAMS_REQUEST_LOG (
EDITEDBY VARCHAR2(20),
OLDTRANSDATE DATE,
REQUESTID VARCHAR2(30) NOT NULL,
OLDQTY NUMBER(20),
NEWQTY NUMBER(20),
NEWTRANSDATE DATE)
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[#|2006-03-01T14:30:29.250+0100|INFO|sun-appserver-pe8.1_02|javax.enterprise.system.tools.deployment|_ThreadID=19;|Total Deployment Time: 11000 msec, Total EJB Compiler Module Time: 0 msec, Portion spent EJB Compiling: 0%|#]
[#|2006-03-01T14:30:29.265+0100|SEVERE|sun-appserver-pe8.1_02|javax.enterprise.system.tools.deployment|_ThreadID=19;|Exception occured in J2EEC Phase
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at com.sun.enterprise.deployment.backend.EJBCompiler.preDeployApp(EJBCompiler.java:340)
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Dotun

you will have to create a sequence and a trigger
CREATE SEQUENCE <SEQUENCE NAME>
INCREMENT BY 1
START WITH 1
NOCACHE
/this sequence will guarantee that each requested number is unique
the trigger will select from this sequence and insert the obtained value in the new record
CREATE OR REPLACE TRIGGER <TRIGGER NAME>
BEFORE INSERT ON <TABLE NAME>
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
    BEGIN
        select
            <SEQUENCE NAME>.nextval
        into
            :NEW.<COLUMN NAME>
        from
            dual;
    END;
[/CODE]
this will always take the value from the sequence, even if you already provided a value yourself
(otherwise you will first have to test if :NEW.<column name> is null, but I wouldn't do this for a key column.
if you need the generated key back for further processing (inserting it into a child table for example), you can use the returning clause on the insert statement
see the oracle documentation for more information about sequences, triggers and the returning clause
greetings
Freek D
I am new to Oracle and need to know how to create a table that uses an automatic incrementation on a primay key for it's default. I need the uniqueness automatically managed by the DBMS.. This activity is know as setting the Column (primary key with identity) in Ms-SQL..
Your help would be appreciated greatly....
Thanks....

CMR - Can a primary key also be a foreign key?

Hi,
Has anyone come across the following problem? Although I mention Jdeveloper below I believe it is a general J2EE issue!
I have two tables
customer
customer_id (PK)
individual
customer_id (PK)
customer_id in individual is the primary key for that table. It is also a foreign key ( related back to customer).
If I use JDeveloper to drag in the two tables ( into a class diagraqm), I have a problem.
JDeveloper "sees" the Individual bean foreign key mapping and generates a getCustomer() method (which returns a handle to the appropriate customer bean).
However as it "removes" the getCustomer_id() method(which returns the actual customer_id), the primary_key reference is dropped.
When I try and compile, JDeveloper quite rightly complains with "where is the primary key".
Can anyone help? Do I need to make it a rule that the foreign key is not also the primary key?
thanks in advance,
Kevin

Hi Kevin,
I would not pursue this model if I was you. The only thing OC4J supports without killing yourself is to let each table has its own primary key (preferably not composed) and to make all foreign key's optional !
We have spent months trying to make it work and we are getting little or no support from oracle, even though we are paying many euros for a partnering contract.
greetz,
Jurgen

Primary Keys and Triggers

I am developing a web application for the agency I work for and would like to use toplink (10g, aka 9.0.4). The agency has hade a policy since about Oracle 6 that all primary keys will be generated by a standard trigger returning a 32 character string. This policy is unlikely to change.
Can toplink be used in this scenario? It does not appear that this is possible. I have seen the "return policy" example which appears to be a solution, but this is for a prototype version of 10g that is not yet released. At least, that is my interpretation.
Can toplink 10g (9.0.4) insert records into tables where the primary key is generated by a trigger?
Can this be configured in the Workbench or is this configured manually (if at all)?
Thanks,
Brad Smith

Really it's an impedence mismatch issue.
With or without TopLink, no matter what you do you're going to always have to do two round trips to get new data in the database (once to Insert it and once to read the PK for use in the cache).
The question I usually ask is -- is this generated PK relevant to your business model? If it's not relevant, then don't map it, and create and use your own PK that can be managed in the mid-tier, use native sequencing, or some other O-R friendly approach. Go ahead and let the database trigger-generate keys, as long as you have some other unique value for the object, then it doesn't matter if the DB trigger generates one for it's own purposes.
If you do at some point need this tigger generated value, you can make use of events. Pre/post insert/update/delete/write, whatever, events can be used to get/manage the trigger generated data on the database through JDBC calls.
Bottom line is that impedence mis-match is your enemy in this situation, and TopLink has the event framework at your disposal to work with this mismatch.
- Don

Null in Composite Primary Key and "Primary keys must not contain null"

Hello all.
I'm a newbie concerning to JPA/EJB3, but I was wondering if toplinks doesn't support composite primary keys with null in some field (something perfectly right in any RDBMS).
I used JDeveloper (I'm using Oracle 10g database and JDeveloper 10.1.3.2.) wizards to generate JPA classes and I checked out generated files (with annotations), so they should be right (by the way, other O-R mappings for my model are working right, but this one).
I'm getting the next error:
Exception Description: The primary key read from the row [DatabaseRecord(
     TSUBGRUPOSLDI.CD_GRUP => 01
     TSUBGRUPOSLDI.CD_SUBGRUP => null
     TSUBGRUPOSLDI.CG_POBL => 058
     TSUBGRUPOSLDI.CG_PROV => 28
     TSUBGRUPOSLDI.DSCR => Sanidad)] during the execution of the query was detected to be null. Primary keys must not contain null.
Compound primary key is (CD_GRUP, CD_SUBGRUP). No foreign keys, no joins (only a NamedQuery: "select o from ..."). It's the simplest case!
I checked out that everything runs ok if there's no "null" value in CD_SUBGRUP.
After some research (this and other forums) I'm beginning to believe that it's not supported, but not sure.
Am I doing sth wrong? If not, what is the reason to not support this? Will it be supported in the future?
Thanks in advance.

Null is a special value and in many databases is not comparable to another null value (hence the isNull operator) and may pose problems when used to uniquely identify an Entity. TopLink does not support null values within a composite PK. As the nullable column is most likely not designated as a PK within your database table (many databases do not allow this) I recommend updating the Entity PKs to match that of the database.
--Gordon

Problem with foreign and primary keys migration from SQL Server to Oracle

Hi folks, i'm using SQL Developer to migrate from a SQL Server database to Oracle and i'm stuck with a couple issues:
The worst of them so far is the fact that i can't migrate any of the PKs and FKs. After successfully capturing the SQL Server DB model and converting it to Oracle, when the tool generates the scripts, all ALTER TABLE queries that add the PKs and FKs have their target columns duplicated.
for example: when i'm trying to migrate a simple table that contains an Id (PK) and Name columns, the tool generates the following scripts:
PROMPT Creating Table TestTable...
CREATE TABLE TestTable (
Id NUMBER(10,0) NOT NULL,
Name VARCHAR2 NOT NULL
PROMPT Creating Primary Key Constraint PK_TestTable on table TestTable ...
ALTER TABLE TestTable
ADD CONSTRAINT PK_TestTable PRIMARY KEY
Id,
Id
ENABLE
As for the FKs, the tool duplicates the columns as well:
ALTER TABLE SomeTable
ADD CONSTRAINT FK_SomeTable_SomeTable2 FOREIGN KEY
SomeTable2Id,
SomeTable2Id
REFERENCES SomeTable2
Id,
Id
ENABLE
Does anyone have a clue on how to solve these issues? I'd be greatly thankful for any answers!

Hi Fernando,
I was unable to replicate this issue. My primary / foreign keys where defined using unique columns.
PROMPT Creating Primary Key Constraint PK_Suppliers on table Suppliers ...
ALTER TABLE Suppliers
ADD CONSTRAINT PK_Suppliers PRIMARY KEY
SupplierID
ENABLE
I tried a few things like
capturing twice and renaming both models the same
renaming the converted models
but with no luck.
I think this issue is occuring either at the capture or convert phase.
1) Are you performing the capture online or offline?
2) Can you provide a the entire DDL for one of these tables and its indexes to see if I can replicate?
3) Did the capture or convert fail or have to be redone at any stage ?
I all else fails I would attempt a capture and convert again using a brand new repository (create a new schema in Oracle and associate the migration repository with it).
Regards,
Dermot
SQL Developer Team
Edited by: Dermot ONeill on Oct 22, 2009 12:18 PM

Solved: ADF BC and primary keys - how to implement without using triggers

Using the following OBE as an example:
http://www.oracle.com/technology/obe/obe9051jdev/ADFWorkshop/BuildingADFApplicationsWorkshop.htm
There is just one view that has CustomerId defined as a primary key, where the value for the primary key comes from the customer_seq sequence.
How do you create the model using ADF BC entity to create an entity object that has a primary key that needs to be populated by a sequence table when inserted WITHOUT using a trigger?
Basically I want to just use ADF BC instead of toplink in the OBE. We do not use triggers to insert primary keys, so this example is a good match for what I need.
Can someone help me out. How do I adjust the model to use just ADF BC - how do I define the entity object to use a sequence. Do I just override the create method in the impl? Is it that simple? Or is there a way to do this point and click in the entity tool.
Thanks!

I'm not the dba (or one of several) - so don't shoot the messenger... the dba's do not like to use triggers in the code. I have been told that this has caused too many problems in application development.
I don't ask why, just deal with the fallout.
I did try using the following code in a create method:
protected void create(AttributeList attributeList)
super.create(attributeList);
SequenceImpl s = new SequenceImpl("customers_seq", getDBTransaction());
// this.setCustId(s.getSequenceNumber());
this.createPrimaryKey(s.getSequenceNumber());
When I run the test program for the module, I get a new entry with the id empty and greyed out. I was hoping that this would be filled in on the actual insert, but no joy. As soon as I try to commit, I get an error:
(oracle.jbo.AttrValException) JBO-27014: Attribute CustId in CustomersWSView is required)
So what needs to be done?
Message was edited by:
klee

Oracle 10g express edition primary key problem

Hi , i have a database with varchar as primary key eg.SEG. however after i insert row and set priamry key as SEG , the primary key will be displayed as number eg.1 and not SEG. Why is it so?

835401 wrote:
Table Data Indexes Model Constraints Grants Statistics UI Defaults Triggers Dependencies SQL
CREATE TABLE "TEST_DEPARTMENT"
(     "DEPT_CODE" VARCHAR2(10) NOT NULL ENABLE,
     "DEPT_NAME" VARCHAR2(50),
     CONSTRAINT "TEST_DEPARTMENT_PK" PRIMARY KEY ("DEPT_CODE") ENABLE
CREATE OR REPLACE TRIGGER "BI_TEST_DEPARTMENT"
before insert on "TEST_DEPARTMENT"
for each row
begin
select "TEST_DEPARTMENT_SEQ".nextval into :NEW.DEPT_CODE from dual;
end;
ALTER TRIGGER "BI_TEST_DEPARTMENT" ENABLE
This is my SQLSo why is DEPT_CODE defined as VARCHAR2(10) when you are going to populate it (via the trigger) with a NUMBER?

Problems Engineering Surrogate Primary Key with Unique Key

SDDM 3.3.0.747 with 2 problems (at least so far). I am hoping that the problem is with this SDDM rookie and I have overlooked some setting. PROBLEM 1 I don’t want to start a religious debate about surrogate vs. natural keys but I am having a problem engineering both correctly from the logical model. I am a rookie when it comes to SDDM but have many years of experience with Designer. By default I like to have both a natural UID (UK) and a surrogate key based primary UID (PK) which is used for foreign keys. The problem I am having with engineering is I can successfully engineer the surrogate PK’s, engineer the FK’s using the PK’s but cannot get the unique key to contain the surrogate keys in the child table. If I check the identifying property in the relations, the PK columns and the UK columns are included in the child PK and the UK contains no columns. The Setup I have defined two reference entities, PROBABILITY and SEVERITY with natural unique keys defined. I also have a child entity RISK_ASSESMENT with relationships back to the PROBABILITY and SEVERITY entities and both have the “Use surrogate keys:”: check box checked. The unique key for the RISK_ASSESMENT entity includes the relationships back to PROBILITY and SEVERITY. None of the entities have a PK or surrogate key defined and they all have the “Create Surrogate Key” check box checked. In addition the following preferences are set: Data Modeler/Model/Logical NOT Checked - Use And Set First Unique Key As Primary Key NOT Checked – Name – Keep as the name of the Originating attribute Checked – Entity Create Surrogate Key Checked – Relationship Use Surrogate Key PROBLEM 2 When the foreign key columns are engineered I want the names to have a prefix “FK_” but they don’t. Templates are set as follows: Data Modeler/Naming Standard/Templates Foreign Key: FK_{child}{parent} Column Foreign Key: FK_{ref column} Engineer to Relational Model/General Options Checked - Apply name translation Marcus Bacon

I have been switching between SD 4 EA1 and SDDM 3.3 trying to get things to work and trying out the template table for adding audit columns (really nice!).
Concerning Problem1. No matter what settings I use and whether I use SDDM 3.3 or SDI cannot get the FK columns to be included in the UK even though the relations are included in the UID in the entitty. When I open the properties of the child table and click on the naming standards button and click ok it complains that the UK is not complete. I add the FK columns to the UK and all is well including the naming standards.
Concerning Problem 2. Sometimes it engineers the names for FK's from the template and sometimes it doesn't. Didn't see a pattern. Gave up trying and used Naming Standards button. I still had to change a few.
The good new is, that after make changes needed in UK's and Column names of 18 tables, I know have everything deployed to Test except FK Indexes. I think I have to do those by hand.
Marcus Bacon

Virtual Primary Key on Model

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