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Using sequences in Hibernate 5.0

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jgrossmann

Post subject: Using sequences in Hibernate 5.0

Posted: Thu May 12, 2016 10:18 am

Newbie

Joined: Thu May 12, 2016 9:57 am
Posts: 2

I am trying to migrate my code from Hibernate 4.3 to 5.0. In Hibernate 4.3 I used a SequenceStyleGenerator to get numbers from a sequence with the following code:

Code:

   fGenerator = new SequenceStyleGenerator();
      Properties params = new Properties();
      params.setProperty(SequenceStyleGenerator.SEQUENCE_PARAM, sequenceName);
      params.setProperty(SequenceStyleGenerator.OPT_PARAM, StandardOptimizerDescriptor.POOLED.getExternalName());
      params.put( PersistentIdentifierGenerator.IDENTIFIER_NORMALIZER, new ObjectNameNormalizer() {

         @Override
         protected boolean isUseQuotedIdentifiersGlobally() {
            return false;
         }

         @Override
         protected NamingStrategyDelegator getNamingStrategyDelegator() {
            return ImprovedNamingStrategyDelegator.DEFAULT_INSTANCE;
         }

         @Override
         protected NamingStrategy getNamingStrategy() {
            return DefaultNamingStrategy.INSTANCE;
         }

      });

      fGenerator.configure(StandardBasicTypes.LONG, params, dialect);

In hibernate 5.0 both the ObjectNameNormalizer and the configure method have changed. I tried the following

Code:

   fGenerator = new SequenceStyleGenerator();
      Properties params = new Properties();
      params.setProperty(SequenceStyleGenerator.SEQUENCE_PARAM, sequenceName);
      params.setProperty(SequenceStyleGenerator.OPT_PARAM, StandardOptimizerDescriptor.POOLED.getExternalName());
      params.put( PersistentIdentifierGenerator.IDENTIFIER_NORMALIZER, new ObjectNameNormalizer() {

         @Override
         protected MetadataBuildingContext getBuildingContext() {
            return null;
         }
         
      });

      fGenerator.configure(StandardBasicTypes.LONG, params, registry);

This does not work. I found out that in order make the generator work the method registerExportables(Database database) must be called. But I don't know where I can get the correct object of type Database from. I should somehow get it from the configuration but I don't know how. Or do I have to register my sequence object so that the registerExportables method is called for me?
I also don't know what kind of ObjectNameNormalizer I should use or what MetadataBuildingContext I should return.
Does anyone know how to use sequences without using entities or JPA?

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vlad

Post subject: Re: Using sequences in Hibernate 5.0

Posted: Mon May 16, 2016 7:50 am

Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania

I guess that you are bootstrapping Hibernate programmatically, so you already have access to the StandardServiceRegistry. In that case, you should change your code to:

Code:

StandardServiceRegistry serviceRegistry = ...;

properties.put(
        PersistentIdentifierGenerator.IDENTIFIER_NORMALIZER,
        new ObjectNameNormalizer() {
            @Override
            protected MetadataBuildingContext getBuildingContext() {
                return new MetadataBuildingContextTestingImpl(serviceRegistry);
            }
        }
);

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jgrossmann

Post subject: Re: Using sequences in Hibernate 5.0

Posted: Mon May 23, 2016 8:55 am

Newbie

Joined: Thu May 12, 2016 9:57 am
Posts: 2

Using the MetadataBuildingContextTestingImpl class alone did not work. This is the code that finally worked:

Code:

   public MySequenceImpl(String sequenceName, final StandardServiceRegistry registry) {
        fGenerator = new SequenceStyleGenerator();
        Properties params = new Properties();
        params.setProperty(SequenceStyleGenerator.SEQUENCE_PARAM, sequenceName);
        params.setProperty(SequenceStyleGenerator.OPT_PARAM, StandardOptimizerDescriptor.POOLED.getExternalName());
        final MetadataBuildingContext context = new MetadataBuildingContextTestingImpl(registry);
        params.put( PersistentIdentifierGenerator.IDENTIFIER_NORMALIZER, new ObjectNameNormalizer() {

         @Override
         protected MetadataBuildingContext getBuildingContext() {
                        return context;
         }
         
      });

      fGenerator.configure(StandardBasicTypes.LONG, params, registry);
      fGenerator.registerExportables(context.getMetadataCollector().getDatabase());
   }

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