unique « Composite « JPA Q&A

1. How to set a unique composite index for a many-to-many join table stackoverflow.com

I have the following mappings:

  <!-- ************* Resource ************************* -->
  <class name="Resource" table="a_resource">
      <id name="resourceId">
          ...

2. Composite Unique Key problem in Hibernate. coderanch.com

All ranchers: I have got the problem in mapping 2 properties to a composite unique key in hibernate. The target sql script should be like this: CREATE TABLE acl_permission ( id BIGINT GENERATED BY DEFAULT AS IDENTITY(START WITH 0) NOT NULL PRIMARY KEY acl_object_identity BIGINT NOT NULL, recipient VARCHAR_IGNORECASE(100) NOT NULL, mask INTEGER NOT NULL, CONSTRAINT unique_recipient UNIQUE(acl_object_identity, recipient), FOREIGN KEY ...

3. referencing unique part of a composite key fails forum.hibernate.org

@Entity @IdClass(A.AId.class) public class A { @Id @Column(unique = true) private long akey; @Id private long anotherkey; // ID class, getter and setter follow } //-------------------------------------------------------------- @Entity public class B { @Id ...

4. How to define composite unique key annotation forum.hibernate.org

Hi All, I have a table (USERROLE) with one primary key(UserRoleID) and two foreign keys (UserId and RoleID). I want to declare the two foreign keys together as composite unique key means, there will not be more than one row with same UserID, RoleID together. Any one can give me some idea how this can be done by annotation ? Thanks ...

5. Two composite unique keys for a table-mapping forum.hibernate.org

hi, If a table has two unique composite keys (for that matter,more than one), can they be included in the primary key class ? and mapping file of a domain object? so that other domain objects may establish relationships (one-to-many or many-to-many or many-to-one)with any key they like.. suppose consider this scenario (these tables) parent ====== id int id1 int name ...

6. Modelling a composite unique key containg a foreign key forum.hibernate.org

I am struggling to find the markup required to generate the below schema, in particular the unique key on the Description table. It is a composite key made up of a foreign key and a version number. I accept that perhaps I should dump the IDENTITY primary key on Description; this still leaves me unsure about how to define a composite ...

7. composite unique property forum.hibernate.org

Hello All, I have to design a mapping where two properties combined together are unique. I cannot use a composite-id for this as the primary key is self generated. I have noticed a tag called composite-element, but it says that I have to use components for it. I am not sure if I want to use that. Basically from the main ...

8. Unique identifiers generation with composite id key forum.hibernate.org

Hi, I need to used unique identifiers generation for a key-property part of a composite id. Unfortunatly there is no child element for nor elements. But anyway, is it possible to use hibernate unique id generation algorithms to generate a part of the composite id. Thanks for your help.

9. Unique composite alternate key forum.hibernate.org

I found on page 354 of Hibernate in Action, that there is an attribute: unique-key in addition to unique. Xdoclet has support for this as well. I was making it harder than necessary I guess. I thought I needed an external class as I did when I was using a composite primary key.

10. Composite key unique violation in many-to-many List forum.hibernate.org

private

11. composite unique key forum.hibernate.org

12. composite unique id forum.hibernate.org

...

13. Problem with composite unique key and forum.hibernate.org

I'm trying to create a table that has a a unique constraint that consists of multiple columns. After some time i found and when i use it then i get the correct unique constraint. But the code no longer runs when i try to read some objects using the Criteria API. When the properties are define "as usual" everything works ...

14. how to map composite unique key as a composite foreign key forum.hibernate.org

Hi, I am getting the following error when am trying to run my application( using MySql database). Here I am using parent table's composite unique key as a child table's composite foreign key. Foreign key (FK7E46806589B41CD9:ct_bill_of_material [MATERIAL_NUMBER,SAAS_ORG_KEY])) must have same number of columns as the referenced primary key (ct_material [MATERIAL_KEY]) My db scripts for the parent(ct_material) and chils(ct_bill_of_material) as follows. (unnecessary ...

15. Problem mapping composite-id and 1:n with unique foreign key forum.hibernate.org

Author Message s-k Post subject: Problem mapping composite-id and 1:n with unique foreign key Posted: Wed Feb 11, 2009 11:37 am Newbie Joined: Wed Feb 11, 2009 11:27 am Posts: 1 Hi, we are using composite-ids for the entities. I know this isn't recommned but it's mandatory for our application. We want to map relations only with a part ...