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javaentitymanager

Java EE: Does EntityManager get method changing state in DB

I want to know if I can perform em.remove for each element in that local list? Does this code changes state in DB?

TypedQuery<Product> query = em.createNamedQuery("Product.findByCode", Product.class);
query.setParameter("code", code);
List<Product> productList= query.getResultList();
   for (int i = 1; i < productList.size(); i++) {
      em.remove(productList.get(i));
   }
Solution

  • Yes it changes the DB, since that is his job.

    The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities.

    https://docs.oracle.com/javaee/7/api/javax/persistence/EntityManager.html