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babernat
 Post subject: Question about "version" attribute names in MySQL
PostPosted: Mon Mar 17, 2008 4:21 pm 
Newbie

Joined: Mon Mar 17, 2008 3:51 pm
Posts: 8
Location: Colorado Springs, CO
Hi,

I'm running 3.2.6.ga and was mapping in a legacy MySQL DB (MySQL 5.0.37-community-nt) using hibernatetool. The table had an attribute called "version" on it. I noticed when I tried to run it I got the following exception:

Code:
Caused by: java.lang.ClassCastException: org.hibernate.type.StringType
   at org.hibernate.tuple.PropertyFactory.buildVersionProperty(PropertyFactory.java:84)
   at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:170)
   at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:434)
   at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:109)
   at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300)


I looked in my mapping file and noticed it had produced:

Code:
        <version name="version" type="string">
            <column name="version" length="32" />
        </version>


when it should have produced:

Code:
        <property name="version" type="string">
            <column name="version" length="32" not-null="true"/>
        </property>


So, I changed it to an attribute and ran my code and it seems to work just fine. Is this a configuration issue on my end or a bug?

Thanks,

Ben
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patrick.huang
 Post subject:
PostPosted: Tue Mar 18, 2008 1:50 am 
Newbie

Joined: Sat Mar 15, 2008 3:54 am
Posts: 6
It's definitely not a bug. Just because "version" has special meaning in hibernate( to control concurrency ).
I don't know what tool you use to "produced" the mapping file but, I think it mistakenly treat that version property as version. Just like if you have a id property, it will by default be treated as id.
That's why I prefer hand craft mapping files :) software can't beat human brain.
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