Hi,

I am new to hibernate and was experimenting with inheritance when i
ran into this problem. Basically i have modelled an entity named as
Tag which has 2 major attributes. TagTitle and TagData. Now Tag is
subclassed by many classes like LocationTag, CommentTag , ImageTag
etc. They all use the TagData field to store their data.

I have a configured Tag.hbm.xml file where i have declared the
subclasses but left there property set empty since all of then wil be
using the parent class getters and setters. below is an excerpt from
the file.

<class name="Tag" table="usertags" >
       <id name="TagID" column="tagid" type="long">
           <generator class="native"/>
       </id>
       <discriminator column="tagtype" type="string"/>

       <property name="TagData" column="tagdata" type="string"/>
       <property name="TagTitle" column="tagtitle" type="string"/>

       <subclass name="LocationTag" discriminator-
value="locationtag">
       </subclass>

The LocationTag uses the tagdata field to store the longitude and
latitude info in comma separated format. Like 22.345,-23.445

Now i have implemented a method in LocationTag class to parse and
retrive the Longitude & Latitudes (getLongitude , getLatitude)  from
the datafield. & corrosponding setMethods set the datafield in
appropriate format.

The issue is arising when i want to  use the Hibernate Query Language
to query locations whose longitude is say 22.23. I wrote following
code.

Query qr= session.createQuery(" from LocationTag as tg where
tg.Longitude=22.23");
    List<LocationTag> lst=qr.list();
    for(LocationTag ltg:lst)
    System.out.println(ltg.getLocationName());

I throws a Could not resolve property Longitute exception. So i am
unable to understand how describe a attriute which is infact derived
from another attribute.

If i am posting to a wrong groups please point me an appropriate
group.

Thanks,