Hibernate Tip : How to detach an entity from the persistence context
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This time I will show you how to detach entities from your persistence context.
As I explained in one of my previous video and in my Hibernate Performance Tuning training: When you need to update or delete a huge number of entities, it is often better to use a JPQL or SQL statement instead of updating one entity after the other. Instead of performing at least one query for each updated entity you then just need to execute 1 query.
But the JPQL or SQL statement also has a disadvantage. Hibernate doesn’t know which database records you’re updating and can’t replicate the changes to the entities stored in the persistence context or 1st level cache. You, therefore, need to do that yourself and detach all entities from the persistence context before you execute the query.
That’s when I always get the same question: How do you detach an entity from the persistence context?
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