In JPA delete entity example, we will learn to delete JPA entities using @NamedNativeQuery created with createNativeQuery() method of the EntityManager interface. Here we pass in the query string to be executed in underlying database and a dummy result mapping [Read More]. We will use named SQL native queries for defining the delete queries in […]
JPA named query update example. Learn to use @NamedNativeQuery annotation to execute SQL update queries using EntityManager.cexecuteUpdate() method.
In this JPA native query example, we will learn to use JPA named query @NamedNativeQuery using createNativeQuery() method of the EntityManager interface.
In JPA, mapping information of an entity must be accessible to the ORM provider at runtime, so that when it is writing the data to storage, it can be obtained from the entity instance. Similarly, when the entity state is loaded from the storage, the provider runtime must be able to map the data into […]
In JPA, once an entity is persisted in the database, the next thing one typically wants to do is find it again. Let’s see how an entity can be found using the entity manager. Using EntityManager.find() In reality, there is really only one line that’s important: In above line, we are passing in the class […]