JPA classPK created, why

Hi,
I don´t know much about JPA. So I tried some examples and created my own. Some things were very strange for me. When I use two tables with a one to many relation, my IDE creates a class names somewhat as classPK, which has only the method equals()...
What is it good for?
Can I use this method for easier access.
What is the suggestion to find an argument of an linked table, a query with a where clause or at firstt the entity and via the entities id the linked entity?
Or is it necessary for JPA to work?
By the way, I use OC4j JEE to develop and test. As it seems when I create a entiy (annotated with @Entity), a session facade and start filling a first instance with values, I can perform an query withot persist() afterwards. Why?
I thought At first I have to persist my new Entity? Is it handled by the container automatically?
When to use persist()?
Thanks for your comments.
I read some books (really) about JPA but coukldn´t find how exactly this works in JEE.
Rolf

These are probably pal accounts. How many subscribers do you have?
I have two subscribers "transactional queued". What do you mean with "pal accounts" ?
At one subscriber (test machine) i deleted now all these accounts, replication is still running, so i think they could be deleted.
Maybe they where created during the setup of the subscription because at this time the Agent Queue Reader was not in the access list of the subscriber ?
Beside an other question, also at the subscriber there are tables created like "dbo.conflict_<DBNAME>_<TABLENAME>" is that normal ?
BTW: its a pitty that i couldnt find that topic (REPLCERTLOGIN_REPLCERT...) at the knowledgebase :(
Thanks for answering
MBChris

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Edited by: being on 2009-3-6 下午7:28
Edited by: being on 2009-3-6 下午7:50
Edited by: being on 2009-3-6 下午10:19
Edited by: being on 2009-3-6 下午11:21

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i have tried following steps.
My database connection and the tables are already present.
1- i have created a new dynamic web site project, namely dene..
from project facets i enabled dynamic web module, faces support (base, enhanced componnents) , Java Persistence, Javascript Toolkit, JavaServer faces, JSTL, Web 2.0 , Websphere Web(Co-existence),Websphere Web(Extended),Default Style Sheet facets.. and these facets musts be enabled for our project.
2- i have created the CourseList.xsd and using -JAXB- i have created lessons.java
3- i right clicked project and from the menu .. JPA tools->Generate Entities .. i choose connection and tables to generate entities but unfortunately no entity gets created ... when i only choose student table to generate the entity of, Student.java is being created however Courses.java always returns nullpointerexception..
the stack trace of the exception is in the picture i attached.. here is its link.... [http://www.ibm.com/developerworks/forums/servlet/JiveServlet/download/430-250134-14212507-336353/hata.JPG]
i have thought it might be because i use the openjpa and jaxb libraries of RSA.. and then i tried to load the latest versions of JAXB and openjpa .. i added all of their .jar files to the application classpath.. (if it is sufficient to add only openjpa-1.2.0.jar and jaxb-api.jar files let me know it please).. but this did not work neither..
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java.lang.NullPointerException
while creating lessons.java and the entity java files i am making sure that i give the same package name for both ... but i never succeeded creating courses.java..
in RSA when i right click to project and go te JPA Tools menu there is a menu item "Configure Project for JDBC deployment" .. what is this for.. i have also tried using this and then trying to create entities but this failed too..
then when they did not work ;
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what would you suggest?
how can we achieve this goal for those two tables i mentioned above in RSA and using JPA ?

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comments => 'schedule created at '||to_char(sysdate,'DD-MON-YYYY HH24:MI:SS'));
-- create schedule TIM_SCHED_2_2, with a repeat_interval set
start_datetime__w := '27-FEB-2007 11:34:20.000 AM +10:00';
dbms_scheduler.create_schedule (schedule_name => 'TIM_SCHED_2_2',
start_date => start_datetime__w,
repeat_interval => repeat_interval__w,
end_date => null,
comments => 'schedule created at '||to_char(sysdate,'DD-MON-YYYY HH24:MI:SS'));
-- create schedule TIM_SCHED_2_3, repeat_interval__w = null (SCHEDULE IDENTICAL TO TIM_SCHED_2_1)
start_datetime__w := '27-FEB-2007 11:34:40.000 AM +10:00';
dbms_scheduler.create_schedule (schedule_name => 'TIM_SCHED_2_3',
start_date => start_datetime__w,
repeat_interval => null,
end_date => null,
comments => 'schedule created at '||to_char(sysdate,'DD-MON-YYYY HH24:MI:SS'));
-- create jobs
dbms_scheduler.create_job (job_name => 'TIM_JOB_2_1',
schedule_name => 'TIM_SCHED_2_1',
job_type => 'PLSQL_BLOCK',
job_action => 'begin '||
'insert into tim values (''TIM_JOB_2_1'', sysdate); '||
'commit; '||
'end;',
number_of_arguments => 0,
enabled => TRUE,
comments => 'job created at '||to_char(sysdate,'DD-MON-YY HH24:MI:SS'));
dbms_scheduler.create_job (job_name => 'TIM_JOB_2_2',
schedule_name => 'TIM_SCHED_2_2',
job_type => 'PLSQL_BLOCK',
job_action => 'begin '||
'insert into tim values (''TIM_JOB_2_2'', sysdate); '||
'commit; '||
'end;',
number_of_arguments => 0,
enabled => TRUE,
comments => 'job created at '||to_char(sysdate,'DD-MON-YY HH24:MI:SS'));
dbms_scheduler.create_job (job_name => 'TIM_JOB_2_3',
schedule_name => 'TIM_SCHED_2_3',
job_type => 'PLSQL_BLOCK',
job_action => 'begin '||
'insert into tim values (''TIM_JOB_2_3'', sysdate); '||
'commit; '||
'end;',
number_of_arguments => 0,
enabled => TRUE,
comments => 'job created at '||to_char(sysdate,'DD-MON-YY HH24:MI:SS'));
end;
Cheers,
Tim.

How can I create stored procedure?

I am new in this field, I was reading in this web site on how to create stored procedure,and this is what I did :
SQL> CREATE PROCEDURE test.proc1 (n IN NUMBER)
2 AS BEGIN
3 select * from districts
4 where doe = n;
5 END;
6
Please direct me. I don't know if I am wrong or right, test is the name of the database, and proc1 is the stored procedure that I want to create, why when I hit Enter after END; I got the number 6.
How can I call this stored procedure, if it works.
Thanks in advance
null

Some reading and training might prove useful. Even if you are using Linux, this forum is no place for a question like that.

Auto created line item in J1inchln

Sap Gurus
while doing J1INCHLN extra line is creating for WCT liability account.
FS10n WCT liability account is showing credit balance of Rs 125000
while updating challan one extra line item in credit side is generating by system automatically for Rs 3150 and debit the Liability account, by crediting the Govt. as vendor account by 128150.
WCT liability A/C        Dr       128150
Govt. Vendor A/C      Cr       125000
WCT liability A/C       Cr         3150.Auto Created
Why this entry is generating Please suggest.
Pavan

Hi Pavan,
Check the Govt. Vendor master - withholding tax tab, whether any TDS payment related tax codes are assigned. If so remove them and run the transactions again.
Hope it helps

Creating print files that clients can modify in the future without using Indesign

If I create a print/design piece for clients in Indesign CS3 is there a file format I can give them that they can modify in the future without coming back to me to modify it for them? Essentially build them a design template which they can use for another program such as word / publisher / something like that?
Yes, publisher is gross...I know, i know, i cringed a little too...

I'm with David on this one. If you can charge the client for making changes to a project you already created, why not do so? If the client has ASKED you for an "editable" format of the project so they can "save money" by making their own edits, they're cheating you.
In a nutshell, if a client wants to edit a project, as Rodney mentioned, they'll need to pony up and purchase the required software, and THEN learn how to use it--nothing is free, right?
Also be aware that by giving a client access to your production files, you are setting yourself up for the possibility of many phone calls "asking" how to do this or that in the files. Unless you also plan on adding a cost update for program tutorials, I wouldn't even think of it.
Another thing to consider is this; once you turn over any production files, you may also be blamed for "corrupt files" when the client takes those files (edited or not) to an unknown printer who may tell the client, "I can't use these files". The client will then call you in frustration, exclaiming "The files you sent me are bad! The printer can't use them. You have to fix this right away." At this point, your best option is to add a disclaimer such as a READ-ME file on the disk, that states you aren't responsible for the quality of output of any files which you do not maintain final production control.
Remember: we (as designers, printers, etc.) are in business to make money doing a job that a client doesn't know how to do. That's what business is all about. Just because a client might want to "save money" by doing it themselves doesn't mean you have to "train" them to do it without charging for that service, as well. In my business, I have an actual cost update item entry called "Software Assistance and Training", and we charge $180 per hour or fraction thereof to walk clients through editing a document we created, if they insist on requesting the project files from us. It makes sure we get paid for the time spent on all projects, even if it means spending an hour on the phone to "walk" a client through the steps of using the program. And finally: A client that doesn't want to pay for your services is a client any profitable business doesn't need.
Just something to think about...
Mikey

JPA classPK created, why

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