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Struts & Hibernate
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| | | How are containers handling (or supposed to handle) CMR & capture-schema iss | How are containers handling (or supposed to handle) CMR & capture-schema iss 2004-02-06 - By Stefano De Giorgi
Back
Sorry Vineeth,
I never used Sun J2EE reference implementation but I suppose it did it
in some way but don't know how you specify the mapping exactly ...
Stefano
Vineeth Varghese wrote:
> Thanks Stefano in that case does SUN J2EE 1.4 server support this? if
> it does how can this be done
>
> Stefano De Giorgi wrote:
>
>>Hi Vineeth,
>>
>>container retrieve persistence information from proprietary deployment
descriptors, where you specify
>>mapping column for CMP fields and mapping column for the relation field
>>
>>Best Regards
>>Stefano
>>
>>
>>
>>
>>
>>>Hi folks,
>>>
>>>I am new to CMR in EJB2.0 and was going through RMH's book Enterprise
>>>Javabean.
>>>
>>>I am interested in knowing how the container picks up the relationships.
>>>I haven't exactly tried an example but am stuck without a complete
>>>understanding of this.
>>>
>>>In the 1-1 uni-directional relation example of customer and address, the
>>>schema goes like this :-
>>>Customer has a foreign key pointing to the primary key of address.
>>>
>>>So in the example when I create a Customer bean I supply the cusomter
>>>name, age etc and then I create the Address bean and associate the bean
>>>with this customer bean but I want to know how is this been translated
>>>to the underlaying database. How will the container know that the
>>>primary key of Address should be inserted as foreign key in customer
>>>table. I am guessing that the container will need some hint from the
>>>developer/deployer to accomplish this. Nothing of this sort is given in
>>>the book
>>>
>>>I expect an anwser like "Container will extract the relationship details
>>>
>>>
>>>from the database" :-) so if this is true but we decide to go from a
>>
>>
>>>link table which maps customer_id to address_id how will the data be
>>>inserted there.
>>>
>>>A doubt along similar lines is regarding the one to many uni-directional
>>>example of customers and their phone numbers. The phone number table has
>>>a foreign key pointing to customer but the bean is developed to reverse
>>>this relationship..i.e customer knows all his phone numbers rather than
>>>phone knowing his customer. We do not specify anything about the foreign
>>>keys. So when I find a customer and try to retrieve his phone numbers
>>>how will the container know that it should query the phones table with
>>>the customer id as the customer_id does figure in the phone bean
>>>persistance field
>>>
>>>I hope I am clear enough with my queries...
>>>
>>>Note : I am deploy with the SUN J2EE implementation an using their
>>>deploy tool
>>>
>>>I also have a doubt which is specific to SUN J2EE 1.4 implementation.
>>>
>>>I am trying to capture the schema details from pointbase db that come
>>>bundled with J2ee 1.4
>>>I am running into :-
>>>
>>>D:\>D:\appserver\Sun\bin\capture-schema -dburl
>>>jdbc:pointbase:server://localhost
>>>:9092/vinman -schemaname apps -username apps -password apps -driver
>>>com.pointb
>>>ase.jdbc.jdbcUniversalDriver -table CustomerBean -out CustomerBean.dbschema
>>>
>>>using dburl: jdbc:pointbase:server://localhost:9092/vinman
>>>using username: apps
>>>using password: apps
>>>using driver: com.pointbase.jdbc.jdbcUniversalDriver
>>>using schemaname: apps
>>>java.sql.SQLException  : No suitable driver
>>>at java.sql.DriverManager (DriverManager.java:532)
>>>at java.sql.DriverManager (DriverManager.java:171)
>>>at com.sun.forte4j.modules.dbmodel.jdbcimpl.ConnectionProvider.<init>(Co
>>>nnectionProvider.java:46)
>>>at com.sun.jdo.api.persistence.mapping.ejb.CaptureSchema.main(CaptureSch
>>>ema.java:120)
>>>Exception in thread "main" java.lang.NullPointerException
>>>at com.sun.jdo.api.persistence.mapping.ejb.CaptureSchema.main(CaptureSch
>>>ema.java:177)
>>>
>>>
>>>I have pbembedded.jar from pointbase/lib in the classpath
>>>
>>>Can someone please tell what I am doing wrong? Do I have to include
>>>anything more to the classpath?
>>>
>>>
>>>peace,
>>>Vineeth
>>>
>>>
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>>>
>>>
>>>
>>>
>>
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>>
>>
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