uuid « Data Type « JPA Q&A

1. Best (most efficient) DataType to use for UUIDs as JPA IDs    stackoverflow.com

I want to use UUIDs as IDs for my JPA Objects. I am currently just using a String to store the UUID. What would be more efficient?

2. Postgres + Hibernate + Java UUID    stackoverflow.com

I want to use PostgreSQL's native UUID type with a Java UUID. I am using Hibernate as my JPA provider and ORM. If I try to save it directly, ...

3. What are the various options and their tradeoffs for storing a UUID in a MYSQL table?    stackoverflow.com

I'm planning on using client provided UUID's as the primary key in several tables in a MySQL Database. I've come across various mechanisms for storing UUID's in a MySQL database but nothing ...

4. Using Hibernate UUIDGenerator via annotations    stackoverflow.com

I'm using my uuid as following:

@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid")
@Column(name = "uuid", unique = true)
private String uuid;
but I'm getting a smart Hibernate warning:
Using org.hibernate.id.UUIDHexGenerator ...

5. Manually assign value to a hibernate UUID    forum.hibernate.org

Hi, As we know, in hibernate, configure the generator of a id to "uuid" , then hibernate will auto generate a UUID value to the id field when saving a new object.If configuring the generator to "assigned", the id must be assigned a value before saving a object. And I found that if configuring the generator to uuid and assigning the ...

7. Best Practice: UUID client friendly display.    forum.hibernate.org

I suppose this is an age old question, however, I thought it might be interesting to get some feedback from the Hibernate community. With respect to UUIDs, these IDs if used as primary keys are not very useful to clients who regularly would use an ID to reference a specific record. We've considered implementing an algorithm to create a user friendly ...

8. uuid.string OR uuid.hex    forum.hibernate.org

In what kind of situations would it make sense to use uuid.string as the generator-class? When I use uuid.string as generation class I manage to add only 14 objects/lines to my Oracle table and the I get: net.sf.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session:

9. uuid keys    forum.hibernate.org

I might think that there would be some sort of performance decrease with using UUIDs, although I've never seen very concrete numbers to say how much of a decrease it would be. We looked at using UUIDs in order to generate IDs on object creation and then simply use those for our equals() and hashcode() implementations as they would never change. ...

10. Problem with UUID's in MS SQL SERVER 2000    forum.hibernate.org

Hi I can not found it any where. I have a table where primary key is UUID I made a mapping in X-Doclet : /** * @hibernate.class table="HomePages" */ public class HomePages implements Serializable { private long hp_Id; /** * This tag marks the primary key field * and column in database. * @hibernate.id generator-class="native" column="hp_Id" */ public long getHp_Id() { ...

11. Is uuid unique enough?    forum.hibernate.org

12. INET_ATON, UUID and MD5 on MySQL    forum.hibernate.org

I am currently migrating a project which uses MySQL 4 to using Hibernate with annotations. A number of tables make use of certain mysql functions such as INET_ATON()/INET_NOTA, UUID(), MD5(). How can one make use of these when performing an initial insert, and with INET_NOTA when performing subsequent selects? Is it possible to hint at the sql to be used or ...

13. uuid.hex    forum.hibernate.org

I wan't to to generate a id with uuid.hex. I dont want to use it in connection with a db. Sounds strange but i have generate 500 such ids and map them with other attributes. How can i generate this id with uuid.hex? I use Eclipse and have implemented the hibernate.jar into the buildpath. Iam a newbie in hibernate. I only ...

14. [Resolved] Should I go with natural key since I have UUID    forum.hibernate.org

My colleagues and I are working on a simple application, basically we process a Sunbird iCal file(published via http) and save it to the databse. All what is relevant are the Events. We have a simple POJO Event Code: Long id=...; String uid =...; // from iCal, this is pretty much UUID String forUser=...; Date fromDate=... Date toDate=... String summary=... Now ...

15. Is there a way to use uuid pkey with PostgreSQL?    forum.hibernate.org

16. Wrong data type: BYTEA ? I want to use UUID    forum.hibernate.org

@Entity public class Person extends AbstractEntity { private String name; public String getName() { return name; } public void setName(final String name) { this.name = name; } }

17. JPA Hibernate with UUID and PostgreSQL    forum.hibernate.org

18. PostgreSQL and UUID custum usertype    forum.hibernate.org

Author Message cyberroadie Post subject: PostgreSQL and UUID custum usertype Posted: Sat May 16, 2009 6:20 am Newbie Joined: Sat May 16, 2009 5:58 am Posts: 1 Hi everyone, Since Hibernate doesn't support the uuid sql type and java (java.util.UUID) and PostgreSQL (version 8.3+) do, I've created a custom UserType and generator, this is a first (working) iteration, is ...

19. UUID as ID for JPA Entity    forums.oracle.com