Menu
What is the best way to delete all rows in a table in Hibernate?
If I iterate over a collection and call session.delete() it's not performing to my knowledge.
If I use another option session.createQuery("delete ...") it doesn't affect persistence context.
When I should use these methods if there is no better variant?
348
Deletion Using a JPQL Statement Hibernate supports DML-style delete operations: Foo foo = new Foo("foo"); entityManager. persist(foo); flushAndClear(); entityManager. createQuery("delete from Foo where id = :id") .
In Hibernate, an entity can be removed from a database by calling the Session#delete() or Session#remove() . Using these methods, we can remove a transient or persistent object from datastore.
In a non-transactional environment, multiple rows can be deleted in a batch in Hibernate something like the following. Session session=HibernateUtils. getSessionFactory(). getCurrentSession(); session.
When you now remove an Author entity, Hibernate cascades the operation to all associated Book entities. From there, it cascades it to all associated Authors and from there to their Books and so on. So, in this example, Hibernate will cascade the remove operation from Author 1 to Book 1 and 2.
You can use HQL for truncate table
public int hqlTruncate(String myTable){ String hql = String.format("delete from %s",myTable); Query query = session.createQuery(hql) return query.executeUpdate(); } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
