CODEWITHSUNDEEP
javahibernatejpa
dmonti
dmonti

Reputation: 488

How to retrieve mapping datasource tableName for an entity without Table annotation?

I need to retrieve the database table name of a certain entity using only my EntityManager instance, is that possible?

Or any way to load all mapped tables with related entity classes.

PS.: I'm using Hibernate v4.2.7 without Annotations

Upvotes: 1

Views: 1468

Answers (2)

Maciej Kowalski
Maciej Kowalski

Reputation: 26502

You can get that from hibernate SessionFactory once you strip it out of the EntityManager:

@PersistenceContext
EntityManager entityManager;

public String getTableName(Class entityClass){

    SessionFactory sessionFactory = ((Session) entityManager.getDelegate()).getSessionFactory();

    ClassMetadata classMetadata = sessionFactory.getClassMetadata(entityClass);

    SessionFactoryImpl sessionFactoryImpl = (SessionFactoryImpl) sessionFactory;

    AbstractEntityPersister entityPersister 
            = (AbstractEntityPersister) sessionFactoryImpl.getEntityPersister(classMetadata.getEntityName());

    return entityPersister.getTableName();
}

Could not find appropriate API to use plain EntityManager. If you are allowed to work with the implementation then this worked for me.

Upvotes: 2

dmonti
dmonti

Reputation: 488

Maciej answer was missing some code and I found a way to do with less steps:

private String getTableName ( Class entityClass ) {

    SessionFactory sessionFactory = ( ( Session ) getEntityManager().getDelegate() ).getSessionFactory();

    AbstractEntityPersister persister = ( AbstractEntityPersister ) sessionFactory.getClassMetadata( entityClass );

    return persister.getTableName();
}

I have tried to edit his answer but was rejected =/

Upvotes: 1

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