This one time, at band camp, Robin Hoogeboom said:
RH>Bruce,
RH>
RH>Thank you for your reply.
RH>
RH>
RH>> 'Unfortunately it is not possible to change the objectreference
RH>> and commit it.'
RH>>
RH>> Is this due to the fact that the communication is occurring via a web
RH>service?
RH>>
RH>> Bruce
RH>
RH>My first assumption was that I could change the objectref to the marshalled
RH>object
RH>and commit this one. ObjectNotPersistentException is thrown this way...
RH>Another idea would be to stream the object into the webservice and make
RH>changes
RH>to the object directly and send back and commit back the object....
RH>
RH>We have to deal with a datamodel change runtime, so we cannot use this.
RH>We change the datastructure by making changes into a DOM object and marshal
RH>it.
RH>This is where Castor is used... never ran into problems running xml
RH>marshal/unmarshal ;-)
RH>
RH>After this proces we use Castor JDO to save changes made. That's why the
RH>question comes up " howto update jdo object in combination with xml ? "
RH>
RH>Can I easily commit changes on an object which was originated from Castor
RH>JDO,
RH>but has lost its reference to the Castor persistent layer ?.
RH>The answer is probably "no, you can't ", but you can't blame me for asking
RH>
RH>Now we use this sort of a solution:
RH>
RH>- receive a complete xml of changed object from webservice
RH>- make a DOM object
RH>- change datamodel/structure
RH>- marshal it to Java object (A)
RH>- load original from db (B)
RH>- compare A with B
RH>- make changes to B
RH>- commit B
RH>
RH>If anyone knows a pitfall or other known issue with this approach
RH>or has any idea about the earlier question mentioned I would like to hear
RH>it.
Thanks, your further explanation tells me what I need to know. I think
that your answer is correct that this can't be done. I was actually
thinking that marshalling the XML into a Java object, materializing the
original data from the db and comparing the two objects for changes is
the only solution. But I see that you're already doing this ;-).
Anyone else have any crafty ideas?
Bruce
RH>----- Original Message -----
RH>From: "Bruce Snyder" <[EMAIL PROTECTED]>
RH>To: <[EMAIL PROTECTED]>
RH>Sent: Tuesday, November 26, 2002 2:57 PM
RH>Subject: Re: [castor-dev] howto update jdo object in combination with xml ?
RH>
RH>
RH>> This one time, at band camp, Robin Hoogeboom said:
RH>>
RH>> RH>I'm using jdo and xml package of Castor in one environment.
RH>> RH>
RH>> RH>from DB:
RH>> RH>
RH>> RH>load object
RH>> RH>unmarshal it to xml
RH>> RH>send it to webservice
RH>> RH>
RH>> RH>to DB:
RH>> RH>
RH>> RH>get xml from webservice
RH>> RH>marshal it to object
RH>> RH>create in DB
RH>> RH>
RH>> RH>
RH>> RH>For reading and creating of records it works fine. But now
RH>> RH>i'm trying to find a solution for updating records in the DB.
RH>> RH>
RH>> RH>In the process of updating i need to load the record into a
RH>> RH>data object and set all the values from the marshalled object.
RH>> RH>Unfortunately it is not possible to change the objectreference
RH>> RH>and commit it.
RH>> RH>
RH>> RH>I can imagine that this problem has kept someone busy before.
RH>> RH>I'm interested in a solution to this one.
RH>>
RH>> Robin,
RH>>
RH>> Please explain this situation a bit further. I'm not following the
RH>statement:
RH>>
RH>> 'Unfortunately it is not possible to change the objectreference
RH>> and commit it.'
RH>>
RH>> Is this due to the fact that the communication is occurring via a web
RH>service?
RH>>
RH>> Bruce
RH>> --
RH>>
RH>> perl -e 'print
RH>unpack("u30","<0G)U8V4\@4VYY9&5R\"F9E<G)E=\$\!F<FEI+F-O;0\`\`");'
RH>>
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RH>>
RH>>
RH>
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--
perl -e 'print unpack("u30","<0G)U8V4\@4VYY9&5R\"F9E<G)E=\$\!F<FEI+F-O;0\`\`");'
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