Hi all,
I have a problem updating a existing or null BLOB. I run jboss-4.2.1.GA
(all-config) with its EJB3 implementation and MySQL 5.x with
mysql-connector-java-5.0.7-bin.jar-driver.
I have an entity Signature with a unidirectional relationship to Image (which
holds the BLOB):
| public class Signature ...
|
| @OneToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, fetch =
FetchType.EAGER)
| @JoinColumns({
| @JoinColumn(name="image_id_fk", referencedColumnName="id")
| })
| public com.genloop.base.ImageImpl getImage() {
| return this.image;
| }
|
|
| public class Image ...
|
| @Lob
| @Column(name = "image", columnDefinition="MEDIUMBLOB")
| //@org.hibernate.annotations.Cache(usage =
org.hibernate.annotations.CacheConcurrencyStrategy.NONE) -> I tried this
| public java.sql.Blob getImage() {
| return this.image;
| }
|
In a SLSB, I try a entityManager.merge(aSignagure) and all changes of Signature
and Image (e.g. a field "fileName") will update to the DB, except. The BLOB.
I have done a little debugging and I saw, that the getImage() was not called
after entityManager.merge(). Then I can see something about XYZLoader that (I
think so...) fills the entity-bean with the data of the database. This trace
calls setImage(Blob) with the old BLOB or (if it was null) with null.
What could I do?
Thanks,
Carsten
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