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 – @NamedNativeQuery example
JPA named query update example. Learn to use @NamedNativeQuery annotation to execute SQL update queries using EntityManager.cexecuteUpdate() method.
JPA native query example – @NamedNativeQuery example
In this JPA native query example, we will learn to use JPA named query @NamedNativeQuery using createNativeQuery() method of the EntityManager interface.
JPA – Field vs Property vs Mixed Access modes
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 […]
JPA Find Entity Example
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 […]
JPA Save/Persist Entity Example
Persisting an entity is the operation of taking a transient entity, or one that does not yet have any persistent representation in the database, and storing its state so that it can be retrieved later. In this example, we have created an entity of type DepartmentEntity and persisted it to database. The line no. 13 […]
JPA delete entity example – JPA tutorial
JPA delete entity example. Learn to delete JPA entity by id. Also learn to delete multple jpa entities using Java Persistence Query Language.
Configure JPA without persistence.xml
If you are working on Spring project and using JPA for data access, then you probably have persistence.xml file as well in META-INF folder. If you want to get rid of persistence.xml and configure datasource, persistence units name and entity paths in spring’s application-context.xml only then you can do it as below while configuring entityManagerFactoryBean. […]
Spring Hibernate JPA Configuration Example
In this example, we will learn to configure Spring MVC and Hibernate with JPA along with few other things e.g. validation and custom property editors. I have been asked quite enough times to write this tutorial in past, so here it is. Feel free to post your doubts, comments and suggestions. If you want to […]