Getting all mapped Entities from EntityManager

Question

I have a piece of maintenance code that should grant select privileges to a certain user at certain points of time:

grant select on A_DB.A_TABLE to READ_ONLY_USER;

I want to do this for all tables. I could use select * from tab in Oracle or show tables in MySQL to get the complete list and then move on like that.

But since I already have the javax.persistence.EntityManager Object at hand, I wondered if there is another way to get at all the mapped Entities, the Manager knows about (I am using Hibernate under the hood).

Answer 1

As of 2016 (Hibernate 5.2), both getAllClassMetadata and Configuration are deprecated.

I guess this could be used instead:

Set<EntityType<?>> entities = sessionFactory.getMetamodel().getEntities();

In special, to get the classes:

List<?> classes = entities.stream()
                          .map(EntityType::getJavaType)
                          .filter(Objects::nonNull)
                          .collect(Collectors.toList());

Answer 2

There are two ways that I can see getting all of the mapped entities and their corresponding SQL tables (there may be others).

The most straightfoward is if you can use your Hibernate Configuration object:

    for(Iterator it = config.getClassMappings(); it.hasNext();){
        PersistentClass pc = (PersistentClass) it.next();
        System.out.println(pc.getEntityName() + "\t" + pc.getTable().getName());
    }

Alternatively, you can do a little more casting and get this same information out of the SessionFactory too:

    Map<String, ClassMetadata>  map = (Map<String, ClassMetadata>) sessionFactory.getAllClassMetadata();
    for(String entityName : map.keySet()){
        SessionFactoryImpl sfImpl = (SessionFactoryImpl) sessionFactory;
        String tableName = ((AbstractEntityPersister)sfImpl.getEntityPersister(entityName)).getTableName();
        System.out.println(entityName + "\t" + tableName);
    }

Answer 3

as MarcG answer states the getAllClassMetadata() is deprecated since few years ago

As of Hibernate - 5.4.30.Final - released March 19th, 2021 The code below works and is not deprecated :

MetamodelImplementor metaModelImpl = (MetamodelImplementor)session.getMetamodel();
Map<String, EntityPersister> entityPersisters = metaModelImpl.entityPersisters();
Collection<EntityPersister> val = entityPersisters.values();               

for (EntityPersister ep : val) {
        AbstractEntityPersister aep = (AbstractEntityPersister)ep;

        System.out.println(aep.getTableName());
        System.out.println(Arrays.toString(aep.getIdentifierColumnNames()));
        for (String propName : aep.getPropertyNames()) {
               System.out.println(propName);
               System.out.println(Arrays.toString(aep.getPropertyColumnNames(propName)));
        }
 }