休眠更新同列

Question

SQL statement:

UPDATE table SET column = 'new_value' WHERE column = 'old_value'

(same column name)

How to do this in Hibernate?

Answer 1

You may use EntityManager.merge() which can lead to NonUniqueObjectException if there are multiple results are found with same column name.

Better to use NamedQuery ot NativeNamedQuery to achieve this.

Answer 2

My understanding is that you would want to perform batch updates.

I suggest you refer to this link

You can make use of the below code in order to get this done.

Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();

String hqlUpdate = "update Customer c set c.name = :newName where c.name = :oldName";
int updatedEntities = s.createQuery( hqlUpdate )
    .setString( "newName", newName )
    .setString( "oldName", oldName )
    .executeUpdate();
tx.commit();
session.close();

Do note the below point mentioned in the link.

Joins, either implicit or explicit, are prohibited in a bulk HQL query. You can use sub-queries in the WHERE clause, and the sub-queries themselves can contain joins.