Examples of javax.persistence.EntityManager.clear()

javax.persistence.EntityManager.clear()
Clear the persistence context, causing all managed entities to become detached. Changes made to entities that have not been flushed to the database will not be persisted. @throws IllegalStateException if this EntityManager has been closed


        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        SQLBigDecimalIdEntity persistedEntity = em.find(SQLBigDecimalIdEntity.class, id);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        em.getTransaction().begin();
        em.persist(d);
        em.getTransaction().commit();
        
        em.clear();
        
        d = findDepartment(em, d.getId());
        assertNoneSQLAnyOrder("SELECT .* DC_DEP_LOC .*");
        // verify that the collection is not delay loaded and does not trigger a load
        resetSQL();

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        SQLDateIdEntity persistedEntity = em.find(SQLDateIdEntity.class, id);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        d.setEmployees(emps);
        
        em.getTransaction().begin();
        em.persist(d);
        em.getTransaction().commit();
        em.clear();
        
        resetSQL();
        d = findDepartment(em, d.getId());
        // assert the select did not contain the employee table
        assertNoneSQLAnyOrder("SELECT .* DC_EMPLOYEE .*");

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(id);
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        EDSQLDateID persistedEntity = em.find(EDSQLDateID.class, d);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        BookId id = new BookId();
        id.setName(bookName);
        id.setLibrary(libName);

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        em.persist(d);
        em.getTransaction().commit();
        
        resetSQL();


        em.clear();
        
        d = findDepartment(em, d.getId());
        assertNoneSQLAnyOrder("SELECT .* DC_DEP_CERT .*");
        resetSQL();
        certs = d.getCertifications();

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        em.persist(d);
        em.getTransaction().commit();
        
        resetSQL();


        em.clear();
        
        d = findDepartment(em, d.getId());
        assertAnySQLAnyOrder("SELECT .* DC_DEP_AWD .*");
        resetSQL();
        awards = d.getAwards();

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        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(person);
        em.persist(entity);
        em.getTransaction().commit();
        em.clear();


        MedicalHistory4 persistedEntity = em.find(MedicalHistory4.class, id);
        StateManagerImpl smi = ((StateManagerImpl) ((PersistenceCapable) persistedEntity).pcGetStateManager());
        Object oid = smi.getObjectId();

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        em.getTransaction().begin();
        em.persist(d);
        em.getTransaction().commit();
        resetSQL();
        em.clear();
        
        d = findDepartment(em, d.getId());
        emps = d.getEmployees();
        em.close();

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