Hibernate saveorupdate not updating

Persistence context can be thought of as a container or a first-level cache for all the objects that you loaded or saved to a database during a session.

The session is a logical transaction, which boundaries are defined by your application’s business logic.

This is not an introduction to Hibernate and you should already know the basics of configuration, object-relational mapping and working with entity instances.

hibernate saveorupdate not updating-86

When you work with the database through a persistence context, and all of your entity instances are attached to this context, you should always have a single instance of entity for every database record that you’ve interacted during the session with.

In Hibernate, the persistence context is represented by or any of those methods to get these changes to the database: all you need is to commit the transaction, or flush or close the session, when you’re done with it.

Unfortunately, there were also many differences: some major, some more subtle.

To act as an implementation of the JPA standard, Hibernate APIs had to be revised.

You may call this method on an already , but it has different implementation details.

The documentation for this method strictly states that it persists the instance, “first assigning a generated identifier”.

Several methods were added to Session interface to match the Entity Manager interface.

These methods serve the same purpose as the “original” methods, but conform to the specification and thus have some differences.

The main differentiating feature of this method is that it conforms to the JSR-220 specification (EJB persistence).

The semantics of this method is strictly defined in the specification, which basically states, that: Notice that there is nothing here that concerns the identifier of an instance.

The spec does not state that the id will be generated right away, regardless of the id generation strategy.

Tags: , ,