How do I query UUIDs stored as binary in a database (JPA/Hibernate/MySQL)

Question

I have a Java/JPA/Hibernate/MySQL based app. I want to use UUIDs for object identity, however I want to ensure database performance does not suffer.

I found this great b

Answer 1

Tested with Hibernate 4.1.2 and MySQL-Connector-J 5.1.18, you can define a UUID field:

@Entity
class EntityType {
    @Column( columnDefinition = "BINARY(16)", length = 16 )
    private UUID id;
}

...and query with a UUID instance:

UUID id = ....;
EntityType result = em.createQuery( 
   “SELECT x FROM EntityType x WHERE x.id = ?1″, EntityType.class )
   .setParameter( 1, id ).getSingleResult();