Hibernate manytoone not updating

Each retrieval method may use a different plan and strategy—that is, a plan that defines what part of the persistent object network should be retrieved and how it should be retrieved.Your goal is to find the best retrieval method and fetching strategy for every use case in your application; at the same time, you also want to minimize the number of SQL queries for best performance.■ Native SQL queries, including stored procedure calls, where Hibernate still takes care of mapping the JDBC result sets to graphs of persistent objects.In your Hibernate or JPA application, you use a combination of these techniques.Retrieving persistent objects from the database is one of the most interesting parts of working with Hibernate.Hibernate provides the following ways to get objects out of the database: ■ Navigating the object graph, starting from an already loaded object, by accessing the associated objects through property accessor methods such as a Address()City(), and so on.

For example, HQL supports ■ The ability to apply restrictions to properties of associated objects related by reference or held in collections (to navigate the object graph using query language).Object state synchronization is the job of the persistence manager, not the developer.But, as we’ve shown in the previous topic, HQL and JPA QL support direct bulk operations for updating, deleting, and inserting, if required by the use case (mass data operations).The default fetch plan and fetching strategy is the plan and strategy that applies to a particular entity association or collection.In other words, it defines if and how an associated object or a collection should be loaded, when the owning entity object is loaded, and when you access an associated object or collection.In this topic, we’ll show you how to retrieve objects from the database and how you can optimize the loading of object networks when you navigate from object to object in your application.

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