entitymanager – Tarik Billa

How to manually start a transaction on a shared EntityManager in Spring?

December 30, 2023 by Tarik

You should use TransactionTemplate object to manage transaction imperatively: transactionTemplate.execute( status -> em.createNativeQuery(“TRUNCATE TABLE MyTable”).executeUpdate()); To create TransactionTemplate just use injected PlatformTransactionManager: transactionTemplate = new TransactionTemplate(platformTransactionManager); And if you want to use new transaction just invoke transactionTemplate.setPropagationBehavior( TransactionDefinition.PROPAGATION_REQUIRES_NEW);

How to mock EntityManager? [closed]

December 6, 2023 by Tarik

I suggest to use Mockito Framework it is very easy to use and understand. @Mock private EntityManager entityManager; If you want to use any method that belongs to entityManager, you should call. Mockito.when(METHOD_EXPECTED_TO_BE_CALLED).thenReturn(AnyObjectoftheReturnType); When you run your test, any call previosly declared in the Mockito.when for the EntityManager will return the value put in the … Read more

Using EntityManager inside Doctrine 2.0 entities

November 30, 2023 by Tarik

It is not a good idea to allow an entity object to rely on the entity manager. It ties the entity to the persistence layer, which was a problem Doctrine 2 was specifically trying to solve. The biggest hassle in relying on the entity manager is that it makes your model hard to test in … Read more

Different ways of getting the EntityManager

September 23, 2023 by Tarik

There are two ways to create EntityManager instances. One way is for SDK applications, and I use this way a lot in unit testing. This is what you have in your example: EntityManagerFactory factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME); In Enterprise applications you let the container create them for you and inject them when needed. EntityManager is just … Read more

The EntityManager is closed

June 27, 2023 by Tarik

My solution. Before doing anything check: if (!$this->entityManager->isOpen()) { $this->entityManager = $this->entityManager->create( $this->entityManager->getConnection(), $this->entityManager->getConfiguration() ); } All entities will be saved. But it is handy for particular class or some cases. If you have some services with injected entitymanager, it still be closed.

What is the difference between LocalContainerEntityManagerFactoryBean and LocalEntityManagerFactoryBean?

May 11, 2023 by Tarik

Basically JPA specification defines two types of entity managers. They are : i) Application-Managed : Application Managed entity manager means “Entity Managers are created and managed by merely the application ( i.e. our code )” . ii) Container Managed : Container Managed entity manager means “Entity Managers are created and managed by merely the J2EE … Read more

What is the difference between EntityManager.find() and EntityManger.getReference()?

May 11, 2023 by Tarik

JPA has the concept of an EntityManager, as you know. During your work in the entity manager some objects are loaded from the database, can be modified and afterwards flushed to the database. find() has to return an initialized instance of your object. If it is not already loaded in the EntityManager, it is retrieved … Read more

PersistenceUnit vs PersistenceContext

April 10, 2023 by Tarik

PersistenceUnit injects an EntityManagerFactory, and PersistenceContext injects an EntityManager. It’s generally better to use PersistenceContext unless you really need to manage the EntityManager lifecycle manually.

JPA merge vs. persist [duplicate]

March 1, 2023 by Tarik

It’s not a good idea using merge when a persist suffices – merge does quite a lot more of work. The topic has been discussed on StackOverflow before, and this article explains in detail the differences, with some nice flow diagrams to make things clear.

Symfony2: how to get all entities of one type which are marked with “EDIT” ACL permission?

February 24, 2023 by Tarik

I don’t believe there’s a default way of doing this. What you could do is to write your own service that adds a Filter to your Doctrine DQL queries. For more info, see: https://www.doctrine-project.org/projects/doctrine-orm/en/2.7/reference/filters.html https://www.doctrine-project.org/projects/doctrine-orm/en/2.7/cookbook/dql-custom-walkers.html Hope this helps!