Spring-data-jpa storing blob

Question

What is \"best\" or canonical way to store entity with blob using spring-data-jpa?

@Entity
public class Entity {
  @Id
  private Long id;
  @Lob()
  private Blob         


        

Answer 1

You can do it with a single statement (4 below) using Hibernate.getLobCreator and passing the session that EntityManager can unwrap to you:

// 1. Get entity manager and repository
EntityManager em = .... // get/inject someway the EntityManager
EntityRepository repository = ...// get/inject your Entity repository

// 2. Instantiate your Entity
Entity entity = new Entity();

// 3. Get an input stream (you shall also know its length)
File inFile = new File("/somepath/somefile");
InputStream inStream = new FileInputStream(inFile);

// 4. Now copy to the BLOB
Blob blob =
  Hibernate.getLobCreator(em.unwrap(Session.class))
           .createBlob(inStream, inFile.length());

// 5. And finally save the BLOB
entity.setBlob(blob);
entityRepository.save(f);