[hibernate-dev] question

[Max Rydahl Andersen]

ask in forum.

-max

>
>
> Hello to all,
> I am practicing with Hibernate and I have a problem with the management of the caching. Excuse my ignorance.
> The simple program that I have developed in order to try the caching's functionality gives me
> an output that I can't understand. The problem is that when the program is using the
> data, which is captured from the DB through the funzione load(), it behaves as if the data
> it was not in cache.Studying the handbook of Hibernate I saw that the data is inserted
> in cache every time is executed the load(), and that it is possible to use the function
> contain() in order to see if this data is effectively in cache, like it really ensues.
> 
> This is the code fragment:
> 
> private void spatialFactory(String[] args){
>
>   config = new Configuration();
>
>   config.configure();
>   config.addClass(MultiPolygonEntity.class);
>
>   Settings settings = config.buildSettings();
>   System.out.println("Generating Data for Dialect: "+ settings.getDialect().getClass().getName());
>
>   SessionFactory factory = config.buildSessionFactory();
>   Session session = factory.openSession();
>
>   Transaction tx = null;
>
>   try{
>        tx = session.beginTransaction();
>        if(args[0].equals("store_mulpol")){
>
>          geom = createMPolygon();
>
>          for(long i=1; i<=gid; i++){
>
>            MultiPolygonEntity MPolygon = (MultiPolygonEntity)session.load(MultiPolygonEntity.class,i);
>
>            Geometry the_geom = MPolygon.getGeometry();
>
>            if(geom.intersects(the_geom))throw new Exception();
>          }
>
>          MultiPolygonEntity MultiPolygon = new MultiPolygonEntity(gid+1,344,"Polygon",geom);
>          session.save(MultiPolygon);
>
>          tx.commit();
>
>        }
>   }
>    ...
> 
> }
> 
> 
> In the moment in which the program is executed, the instruction ' Geometry the_geom = MPolygon.getGeometry();' in order to use
> a property of the loaded object (geometry exactly), the output is the following:
> 
> 22:22:27,975 DEBUG MemoryStore:138 - Cache_SpatialCache: Cache_SpatialMemoryStore miss for hsp.MultiPolygonEntity#1
> 22:22:27,975 DEBUG Cache:661 - Cache_Spatial cache - Miss
> Hibernate: select multipolyg0_.gid as gid0_0_, multipolyg0_.code as code0_0_, multipolyg0_.name as name0_0_, multipolyg0_.the_geom as the4_0_0_ from spatial multipolyg0_ where multipolyg0_.gid=?
> 22:22:28,053 DEBUG MemoryStore:138 - Cache_SpatialCache: Cache_SpatialMemoryStore miss for hsp.MultiPolygonEntity#1
> 22:22:28,053 DEBUG Cache:661 - Cache_Spatial cache - Miss
> 
> To me it seems that, although the load() is executed, the data is not found in cache, even if the use of the function contain() results present.
> Do you know the reason ?
> I have shaped Hibernate with EhCacheProvider and in the rows of mapping I have set up one cache Read-Write.
> 
> thanks,
> 
> Tobia
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