Toplink Essentials how to use scope_identity w/ sqlserver

I created a class that extends SQLServerPlatform and overrode the method buildSelectForNativeSequence with:
public ValueReadQuery buildSelectQueryForNativeSequence() {
return new ValueReadQuery("select scope_identity() AS 'identity' ");
When I run a test I get and error.
I can see from the log that toplink is now using scope_identity instead of @@Identity. What is the problem?
I cannot use @@Identity because triggers are firing on the insert table which is causing the wrong identity to be returned.
Please help!!!!
[TopLink Fine]: 2007.04.02 12:06:33.281--ClientSession(14384648)--Connection(3803825)--Thread(Thread[AWT-EventQueue-0,6,main])--INSERT INTO Personnel (AssignedBy, AssignmentType, CaseId, LastEditedBy, DateAssigned, _version, LastEditedOn, TimeAssigned, cruiser, OfficerId) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
bind => [0000, 1, 8, greg, 2007-04-05 12:06:18.859, 1, 2007-04-02 12:06:33.109, 12:06, null, 0087]
[TopLink Finest]: 2007.04.02 12:06:33.281--ClientSession(14384648)--Thread(Thread[AWT-EventQueue-0,6,main])--Execute query ValueReadQuery()
[TopLink Fine]: 2007.04.02 12:06:33.281--ClientSession(14384648)--Connection(3803825)--Thread(Thread[AWT-EventQueue-0,6,main])--select scope_identity() AS 'identity'
[TopLink Warning]: 2007.04.02 12:06:33.296--UnitOfWork(22481956)--Thread(Thread[AWT-EventQueue-0,6,main])--Local Exception Stack:
Exception [TOPLINK-4011] (Oracle TopLink Essentials - 2.0 (Build b41-beta2 (03/30/2007))): oracle.toplink.essentials.exceptions.DatabaseException
Exception Description: Error preallocating sequence numbers. The sequence table information is not complete.
at oracle.toplink.essentials.exceptions.DatabaseException.errorPreallocatingSequenceNumbers(DatabaseException.java:137)

The error seems to indicate that null is being returned. Verify that scope_identity is returning the correct value. Switching to using a sequence table would workaround the issue and improve your performance through allowing sequence pre-allocation.

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JPA / Toplink Essentials / How to set Table Qualifier?

Hello!
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Using toplink I can use setTableQualifier("...");
regards
Harald.

If I add orm.xml along to persistence.xml in the META-INF directly, TopLink JPA obviously finds it regarding to its log output:
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Toplink Essentials: how can I not to auto persist computed/virtual column

Tags: Toplink Essentials, JPA, virtual columns
Hi All,
This appears to be a newbie question. But I cannot get it solved.
First, my system is Eclipse + TOPlink essentials.
My relational db table has a computed column. It is derived from a column of the same table.
create table WINE(
WINE_NAME VARCHAR2(25),
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Internal Exception: java.sql.SQLException: ORA-54013: INSERT operation disallowed on virtual columns
Error Code: 54013
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bind => PinotNoir, 2003-01-05 00:00:00.0, null
Any suggestions on what annotation tage I should use to tell the JPA Provider not to include VINTAGE in the auto-generated INSERT statement?
Thank you very much.
Jing
Edited by: user11935396 on Sep 25, 2009 1:36 PM
Edited by: user11935396 on Sep 25, 2009 1:37 PM

I am not sure if your annotation @GeneratedValue is proper. According to javadoc "Provides for the specification of generation strategies for the values of primary keys. The GeneratedValue annotation may be applied to a primary key property or field of an entity or mapped superclass in conjunction with the Id annotation."
I would rather try to annotate VINTAGE as @Column(insertable=false, updatable=false)

How to use (toplink essentials)JPA with EJB 2.1 spec in oc4j 10.1.3.2

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How to verify OC4J uses Oracle Toplink 10.x and not Toplink Essentials

Hi,
We dont want to use the default JPA provider "Toplink *Essentials*" that comes with OC4J. Rather we want to use Oracle Toplink 10.x
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Thanks in Advance,
Prashant Tejura
Edited by: user1186295 on May 26, 2009 10:33 AM

rashant,
Hi, there are currently the following providers to choose from - you may want to consult your rep for any details on moving from 10.1.3.4 to 10.1.3.5.
1) TopLink or EclipseLink using EclipseLink JPA - the RI for JPA for WebLogic, OC4J and GlassFish
- EclipseLink JPA is focus of all current JPA development as part of EclipseLink and TopLink
2) Another open-source JPA implementation like OpenJPA or Hibernate
Deprecated:
3) TopLink using TopLink JPA - replaced by (1) TopLink using EclipseLink JPA
4) TopLink using TopLink Essentials JPA - replaced by (1) TopLink using EclipseLink JPA
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http://wiki.eclipse.org/EclipseLink/Examples/JPA/OC4J_Web_Tutorial#Modify_server.xml
<shared-library name="oracle.persistence" version="1.0" library-compatible="true">
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http://wiki.eclipse.org/EclipseLink/Examples/JPA/OC4J_Web_Tutorial#Persistence.xml
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<persistence-unit name="example" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/OracleDS</jta-data-source>
<class>org.eclipse.persistence.example.jpa.server.business.Cell</class>
<properties>
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<property name="eclipselink.logging.level" value="FINEST"/>
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http://wiki.eclipse.org/EclipseLink/Examples/JPA/OC4J_Web_Tutorial#Console_Output
[EL Finest]: 2009-02-26 14:04:34.464--ServerSession(8634980)--Thread(Thread[HTTPThreadGroup-4,5,HTTPThreadGroup])--Begin deploying Persistence Unit example; state Predeployed; factoryCount 1
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     User: SCOTT
     Database: Oracle Version: Oracle Database 11g Release 11.1.0.0.0 - Production
     Driver: Oracle JDBC driver Version: 10.1.0.5.0
[EL Finest]: 2009-02-26 14:04:35.385--UnitOfWork(5746770)--Thread(Thread[HTTPThreadGroup-4,5,HTTPThreadGroup])--PERSIST operation called on: org.eclipse.persistence.example.jpa.server.business.Cell@9107088( id: null state: null left: null right: null parent: null references: null).
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thank you
/michael
www.eclipselink.org

TopLink Essentials: Using spring session scope on the EntityManagerFactory

Hi,
In one of our projects we are trying to utilize the 2nd level cache of TopLink Essentials. The server code is using the Spring (2.0.7) and is deployed to a web container. We are using a Java client and serializes every object between the client and the server.
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<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" scope="session">
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I hope someone are able to explain this behavior for me:-)
Best regards,
Rune

Hi Rune,
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In the first case, if you are not using JPQL then what are you using to load the data and why are you thinking that it will not bypass the cache?
Using a factory instance for each session is not what I would recommend doing as there are some additional costs associated with establishing a factory (even though the session already exists). The first way should be the correct way, I am just not sure what the circumstances are that are causing your cache to not be warmed. You may want to post more details about that so people can better help you out with that angle.
-Mike

Toplink Essentials JPA doesn't use GenerationType.IDENTITY

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Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2.1 (Build b55-fcs (10/10/2008))): oracle.toplink.essentials.exceptions.DatabaseException
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     at oracle.toplink.essentials.sequencing.QuerySequence.update(QuerySequence.java:344)
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I wonder why a sequence table has to be update whereas IDENTITY is defined as strategy. I tried also AUTO as strategy but it doesn' matter, the result is the same.
I read several posts in forums, but couldn't find a solution. So I still have no idea how to get IDENTITY used as strategy. Any one of you does?
My configuration:
IDE: Eclipse 3.4.0
Server: GlassFish V2 Java EE 5
JPA Implementation: Toplink Essentials v2.1-b55
JPA driver: oracle.toplink.essentials.PersistenceProvider
Database: MySQL 5.0.51a
JDBC driver: mysql-connector-java-5.1.5

I did it. I must admit, I was a little bit confused by the annotation TableGenerator. It is not responsible for generating ids of a table at all but only in conjunction with a table which should provide ids.
After I removed @TableGenerator and also the corresponding reference within @GeneratedValue the persistence works as expected. Now the code looks like this:
@Entity
@Table(name = "orders")
public class POrder implements PEntity {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
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...Edited by: TomCat78 on Oct 12, 2008 3:38 PM

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Best Regards,
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Unable to deploy Web App using JPA TopLink Essentials in Tomcat5.5.17

Hi All,
I am trying to deploy a Web App ( used Top Link Essentials ) to Tomcat and i am getting the following Error..
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        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432) Thanks
Sateesh

Spring 2.0 provides custom support for TopLink Essentials in Tomcat out-of-the-box. You should follow the instructions here: http://static.springframework.org/spring/docs/2.0.x/reference/orm.html#orm-jpa-setup-lcemfb-tomcat
Essentially, Spring provides a custom class loader for Tomcat and doesn't use an agent.
--Shaun

How to use bind_variable for connectivity between Oracle and SQLServer 2005

The code specified below could be used as an example of how to call a remote SQLServer 2005 procedure from Oracle.
The problem I am facing is that I am not able to use the dbms_hs_passthrough.bind_variable without exceptions.
Could someone help me out on this?
declare
CREATE PROCEDURE dbo.OrcaMessageTranslator
@inp nvarchar(255),
@outp nvarchar(255) output
AS
BEGIN
select @outp = @inp+'output'
END
c integer;
nr integer;
inp varchar2(255);
outp varchar2(255);
sql_stmt varchar2(32767);
begin
dbms_output.put_line('call SQLServer procedure OrcaMessageTranslator');
dbms_output.put_line('value of input variable inp is HowToReplaceThisValueByBindVariable ');
sql_stmt := 'DECLARE @outp nvarchar(255)
EXEC dbo.OrcaMessageTranslator
@inp = N''HowToReplaceThisValueByBindVariable'',
@outp = @outp OUTPUT
SELECT @outp as N''@outp''';
c := dbms_hs_passthrough.open_cursor@pp_preorca;
dbms_hs_passthrough.parse@pp_preorca(c,sql_stmt);
nr := dbms_hs_passthrough.fetch_row@pp_preorca(c);
dbms_hs_passthrough.get_value@pp_preorca(c, 1, outp);
dbms_hs_passthrough.close_cursor@pp_preorca(c);
dbms_output.put_line('acquired value of output variable outp is '||outp);
end;

Hi,
BIND_VARIABLE is useful when you have only IN variable but in your case you have IN and OUT.
I don't know if you use the gateway for MS SQL SERVER or HSODBC/DG4ODBC but here how you can do to call a remote procedure with bind variables:
DECLARE
ret integer;
inp varchar2(255);
outp varchar2(255);
BEGIN
inp :='Hello World';
outp :='';
ret := "dbo"."in_out_proc_test"@tg4msql( inp, outp);
dbms_output.put_line('Input value: ' ||v_ut1||' - Output value: '||v_ut2);
END;
The MS SQL Server procedure belongs to the user "dbo" and the database link
being used is tg4msql.
The following line initilaize the out variables of the procedure with an
empty string:
outp :=''
I hope it helps you.
Regards
Mireille

How to use TopLink's mapping info at runtime

Can anybody kindly instruct how to do the following:
1) Once the "JavaSource.java" file or the "ProjectDeployment.xml" file is generated by TopLink from a TopLink project, how can it be included and used in a J2EE project at runtime? I understand that this step may be specific to the type of IDE used, let us say WebLogic, WebSphere or JDeveloper9i.
2) Can TopLink generate the file "sessions.xml" automatically or it has to be hard-coded? Does this file have also to be included in a J2EE project under the directory of META-INF at runtime?

Hi John,
Probably the best way I can explain the process of putting a J2EE app with TopLink into production would be to describe the best practices of doing so.
Firstly, I recommend using an IDE to develop your Java source code, although it is possible to generate Java source directly from the Mapping Workbench, this is considered more of a rapid prototyping or quick start process. Once the Java source has been compiled, the Meta-Data (project.xml) can be deployed from the Mapping Workbench.
The next step really depends on the type of application you are creating. Since you are developing a J2EE based application and it will be multi-user, TopLink recommends using a ServerSession architecture. (Consult the documentation for detailed explanations). Configuring the session can be done in a number of ways, the best way would be to use the SessionManager and an external file called sessions.xml. Both the sessions.xml and project.xml must be visible by the J2EE component that will be using it. (Servlet/Session Bean, etc...). This is done through managing your deployment properly using something like an EAR.
The key to getting the application and TopLink working together is the session, and here's a basic example on how you could set this up:
sessions.xml code:
<toplink-configuration>
     <session>
          <name>myProject</name>
          <project-xml>myProject.xml</project-xml>
          <session-type>
               <server-session/>
          </session-type>
          <connection-pool>
               <is-read-connection-pool>false</is-read-connection-pool>
               <name>default</name>
               <max-connections>10</max-connections>
               <min-connections>5</min-connections>
          </connection-pool>
          <enable-logging>true</enable-logging>
     </session>
</toplink-configuration>
Somewhere in your application code, you might have a login method that makes use of the SessionManager to load and create the session:
SessionManager sm = SessionManager.getManager();
          Server serverSession = (Server)sm.getSession("myProject", this.getClass().getClassLoader());
The sessions.xml must be created manually at this point, a future version of the TopLink product will contain an editor which will help out.
Darren Melanson

How to use the Oracle AQ JMS API using Toplink

My application is using AQ using PL/SQL. We want to convert the PL/SQL code to the JMS interface Oracle offers, the problem is that I need to use a java.sql.Connection object in order to connect to the AQ. I don't own the java.sql.Connection in Toplink. How can I enqueue/dequeue to a JMS AQ using Toplink?

In the upcoming 10.1.3 release, TopLink supports mapping to/from Oracle AQ messages through a JCA adapter. This functionality is currently available in the 10.1.3 developer preview release on the Oracle OTN web site. If you have an earlier version of TopLink, using AQ directly may make more sense with TopLink only being used to access an existing JDBC connection.
To use AQ directly a JDBC connection is required - then the AQ JMS interface can be used to access any messages. If TopLink has a JDBC connection with Oracle AQ, it (the JDBC connection) can be accessed via session.getAccessor().getConnection(). Also, if a J2EE datasource/connection pool is being used a JDBC connection could be obtained there as well. One thing to note is that creating a new JDBC connection would be 'safer', as this would avoid having the connection managed when it shouldn't be.
For information on how Oracle TopLink provides EIS access to AQ, please refer to: http://www.oracle.com/technology/products/ias/toplink/preview/howto/eisAq/index.htm

How to use Toplink as SDO in Oracle BPEL

can we use Toplink as SDO for BPEL?

We have not yet shipped our TopLink SDO implementation. The intent is that in our next major release the TopLink SDO will be used internally and should be available for your usage in the OracleAS/SOA suite.
Doug

Accessing the Session in Toplink Essentials

I try access session by this way:
http://ontoplink.blogspot.com/2007/01/accessing-session-in-toplink-essentials.html
and get exception:
(Oracle TopLink Essentials - 2.0 (Build b41-beta2 (03/30/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: Could not find the session with the name [my_name] in the session.xml file []
Is session.xml needed for this ? I hope not, because it requires project.xml and it maybe require some another... All what I need is:
session.getEventManager().addListener(myEventListener);
to force toplink switch database schema in listener preLogin method. In Hibernate, it can be done by one line in config file.
Lumir

OK, I tried obtain session BEFORE creating EntityManagerFactory and EntityManager.
Now when obtaining it AFTER creating EMF and EM, it works.
But this not solve problem with change db schema, because AFTER create EMF and EM, session is logged in and EventListener preLogin isn't called.
Can anyone point me, how to change db schema ? I know it for connection defined using toplink.jdbc.* properties, but not for JNDI:
public class ToplinkSessionCustomizer implements SessionCustomizer
public void customize(Session session) throws Exception
          if(jdbcUrl == null)
               // JDBC URL is not set, assume JNDI lookup
               JNDIConnector connector = (JNDIConnector) session.getLogin().getConnector();
               connector.setLookupType(JNDIConnector.STRING_LOOKUP);
               // 1. Not works, cause NPE
               // at oracle.toplink.essentials.descriptors.ClassDescriptor.verifyTableQualifiers(ClassDescriptor.java:3518)
               session.getDatasourcePlatform().setTableQualifier(schema);
               SessionEventAdapter preLoginEventListener = new SessionEventAdapter()
               // Listen for preLogin events
                    public void preLogin(SessionEvent event)
                    event.getSession().getLogin().setTableQualifier("myschema");
               // 2. Not works, eventManager is null, cause NPE !
               session.getEventManager().addListener(preLoginEventListener);
          else
// This works OK
               DatabaseLogin login = session.getLogin();
               login.useOracleThinJDBCDriver();
               login.setDatabaseURL(jdbcUrl);
               login.setUserName(userName);
               login.setPassword(password);
               login.setTableQualifier(schema);
     }

Toplink Essentials how to use scope_identity w/ sqlserver

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