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

Spring Data does not handle BLOBs but Spring Content does. Specifically, Spring Content JPA stores content as BLOBs in the database and associates that content with an Entity through annotations.

pom.xml

   
   
      com.github.paulcwarren
      spring-content-jpa-boot-starter
      0.0.11
   
   
   
      com.github.paulcwarren
      spring-content-rest-boot-starter
      0.0.11
   

Entity.java

@Entity
public class Entity {
   @Id
   @GeneratedValue
   private long id;

   @ContentId
   private String contentId;

   @ContentLength
   private long contentLength = 0L;

   // if you have rest endpoints
   @MimeType
   private String mimeType = "text/plain";

DataContentStore.java

@StoreRestResource(path="data")
public interface DataContentStore extends ContentStore {
}

The advantage of this approach over the accepted answer is that the Developer doesn't need to worry about any of the boilerplate code (the "service" in the accepted answer). The BLOB is also exposed as Spring Resource giving a natural programming interface. Or can be automatically exported via a REST interface. But none of this requires any coding, on behalf of the Developer, besides java config and the store interface.