Re: Locking is not working (solved)
Hi. Sorry for all that stuff. Finally I solved the problem by simply setting the property ImplicitLocking=true in OJB.properties Thank you so much for your patience. -- José María - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Re: Re: OJB not returning the correct child types.
Hello, I tried out the problem again by making changes to the class-descriptors and schema as per Armin's suggestions and the Advanced O/R Mapping Technique tutorial (Apache OJB site). However the persistence broker still returns instances of Thing class instead of the Book and Toy in the stuffInDrawer collection of the Drawer class. If there are any aspects that I might have over-looked, please point them out. Note that Thing is a concrete class in my case. I am thinking about modifying the OJB source code to fix this extent-awareness problem satisfactorily. However I would need some guidance in helping me understand how OJB creates SQLs in context of repository.xml (descriptors) and how RowReader and RsIterator is used in creating instances of concrete classes. Could any please help me understand the concepts related to SQL building, RowReader and RsIterator and how the current implementation behaves ? Does anyone have a sequence-diagram / activity diagram to illustrate the logic involved ? I am thinking on the lines of using the class-descriptor to look out of extent-class definitions for the class whose data in being read and in the process of being materialized. If I find an extent-class, I would then look in to the table mapped to this extent class for row-entry (using PK or PK/FK as the search criteria) and then decide which object instance to materialize. I am not sure if this is the right way to go. Any advise or help on this is highly appreciated. Thank you for all the support. Regards, Gautam. On Wed, 22 Nov 2006 Virgo Smart wrote : Hello Armin, Apologies for posting a repeat of a similar problem as mentioned in an earlier post. I had already posted this one before I recieved the reply to the earlier one. Looking at the modified class descriptor, I see that the extent-class and anonymous fields are being dropped. I think this is ok. However I am not sure if the super reference descriptor can point to the primary key field descriptor of the parent class. Wouldn't this mean that the PK in the BOOKS / TOYS table would also need to be a FK pointing to the PK of the THINGS table ? Wouldn't this be illegal in SQL ? Thanks and Regards, Gautam On Wed, 22 Nov 2006 Armin Waibel wrote : Hi Gautam, as said in my previous post in thread OJB: Identity equals method impl. you should use the normal TPS inheritance without a FK field and without extent-class declaration within TPS (and don't override fields in the sub-classes): class-descriptor class=Thing table=THINGS field-descriptor name=id column=ID jdbc-type=INTEGER primarykey=true autoincrement=true / field-descriptor name=name column=NAME jdbc-type=VARCHAR size=255 / field-descriptor name=drawerId column=DRAWER_ID jdbc-type=INTEGER access=anonymous / /class-descriptor class-descriptor class=Toy table=TOYS field-descriptor name=id column=ID jdbc-type=INTEGER primarykey=true autoincrement=false / field-descriptor name=category column=CATEGORY jdbc-type=VARCHAR size=255 / /field-descriptor reference-descriptor name=super class-ref=Thing foreignkey field-ref=id/ /reference-descriptor /class-descriptor class-descriptor class=Book table=BOOKS field-descriptor name=id column=ID jdbc-type=INTEGER primarykey=true autoincrement=false / field-descriptor name=author column=AUTHOR jdbc-type=VARCHAR size=255 / field-descriptor name=isbnCode column=ISBN_CODE jdbc-type=VARCHAR size=255 / /field-descriptor reference-descriptor name=super class-ref=Thing foreignkey field-ref=id/ /reference-descriptor /class-descriptor class-descriptor class=Drawer table=DRAWER field-descriptor name=id column=id jdbc-type=INTEGER primarykey=true autoincrement=true / collection-descriptor name=stuffInDrawer element-class-ref=Thing inverse-foreignkey field-ref=drawerId/ /collection-descriptor /class-descriptor The FK field drawerId in class Thing (of the 1:n reference in Drawer) is declared as anonymous. Please read carefully the section about how anonymous keys work to avoid problems http://db.apache.org/ojb/docu/guides/advanced-technique.html#How+do regards, Armin Virgo Smart wrote: Hello, I am facing an issue when trying to
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