OneToOne « Map « JPA Q&A





1. When to use, not to use, OneToOne and ManyToOne    stackoverflow.com

I just started reading of JPA, and the implementation in hibernate to understand the details. but, to continue with development till then, can you help to clarify a basic qn.

  1. When ...

2. Hibernate OnetoOne mapping with two lookup values    stackoverflow.com

I have a class which has two lookup values (one for name and one for type)

public class someAttr {
private Long someAttrId;
private Long projectId;

private Lookup typeLookupValue;
private Lookup nameLookupValue;

getters & setter...

@OneToOne(fetch=FetchType.LAZY, cascade=CascadeType.ALL)
@JoinColumn(name = ...

3. How to map this OnetoOne in hibernate using JPA    stackoverflow.com

I have following Entity -

@Entity
public class Foo {
    @Id
    private Long id;

    @OneToOne(cascade = CascadeType.ALL, mappedBy = "foo")
    ...

4. Does a OneToOne entity need to have a ManyToOne relationship to the parent entity    stackoverflow.com

Does a OneToOne entity need to have a ManyToOne relationship to the parent entity or is it not needed?

@Entity 
class Foo {

@OneToOne Bar bar;
}

@Entity 
class Bar {

// Do I need to ...

5. Hibernate code...exception in onetoone mapping    stackoverflow.com

I am getting weired exception and not able to trace why it so. Please help me here. I am just using OneToOne mapping with PrimarykeyJoinColumn property.

@Entity
@Table(name="mediashow_user1")
public class UserVO implements Serializable{

private static final ...

6. [hibernate] OneToOne add a new child :o(    coderanch.com

Hi there, I'm new with persistence, and I'm having a problem updating an object which has a chlid object referenced by a OneToOne relation. When I update the child properties a new row is added into the table, while I'd like just udpate the existing one. The father @Entity @Inheritance(strategy =InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name="type",discriminatorType=DiscriminatorType.STRING) @DiscriminatorValue("simple") @Table(name="USER") public class User implements java.io.Serializable { private ...

7. Hibernate exception in OneToOne mapping    coderanch.com

I am getting weired exception and not able to trace why it so. Please help me here. I am just using OneToOne mapping with PrimarykeyJoinColumn property. @Entity @Table(name="mediashow_user1") public class UserVO implements Serializable{ private static final long serialVersionUID = 6066636545309839156L; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long empid ; private String email = null; private String fname = null ; private String ...

8. Compound primary keys and OneToOne mapping - need advice    forum.hibernate.org

Hi, I have three entities A, B, and C. Code: @Entity public class A implements java.io.Serializable { @Id private String s; ... } @IdClass(BKey.class) @Entity public class B implements java.io.Serializable { @Id @Temporal(javax.persistence.TemporalType.DATE) private ...

9. OneToOne and ManyToOne associations on same column    forum.hibernate.org

Newbie Joined: Mon Mar 27, 2006 8:21 pm Posts: 4 This problem sounds similiar to http://forum.hibernate.org/viewtopic.php?t=983185 but I'm creating a separate post in case its not. I have a legacy database with the a parent/child relationship where one of the children is the "default" child. Code: +--------+ 1..n +-------+ | Parent |/\____________| Child ...





10. onetoone mapping problem    forum.hibernate.org

Hi I have a onetoone mapping problem. What I would like to a achieve is a kind a type 2 mapping. So the key should compose of startdate, enddate and id. this is also the key of the associated object. A object should be updated when startdate is never than startdate or older than enddate and id is the same. In ...

11. OneToOne with Inheritance    forum.hibernate.org

@OneToOne @JoinColumn(name = "ORDER_ID", nullable = false) public Payment getPayment() { return payment; } public void setPayment(Payment payment) { this.payment = payment; }

12. Filtered OneToOne mappings    forum.hibernate.org

So assume you have two entities, School and Student and obviously there is a one to many relationship. But the student entity has a column called valedictorian, and one of these students has the value 'Y', whereas all the rest have 'N'. (or you can come up with some more complex way of determining that from the student entity, if that ...

13. OneToOne mapping with foreign keys, How to?    forum.hibernate.org

Hello, hopefully someone can help me with this sligtly exotic setup. I have two tables here which are associated OneToOne and I want them to be mapped onto a unidirectional association. When using the hibernate schema export it forces me to have the foreign key in the table which belongs to the java Object which holds the association. Is there any ...

14. Question about mapping what seems like a simple OneToOne    forum.hibernate.org

As an example, I have something like the following structure: create table foo ( foo_id int, data text primary key (foo_id) ); create table bar ( foo_id int, data text, constraint bar_foo_fk foreign key (foo_id) references foo on delete no action primary key (foo_id) ); I can't get this to work. One doesn't inherit from the other, it's just related data ...

15. OneToOne mapping to JBPM entity    forum.hibernate.org

Author Message wurzelbutz Post subject: OneToOne mapping to JBPM entity Posted: Tue Feb 17, 2009 5:02 am Newbie Joined: Tue Feb 03, 2009 10:49 am Posts: 10 Hibernate version: 3.2.4.sp1 Hibernate Annotations: 3.2.1.GA Name and version of the database you are using: MYSQL 5 Hi i'm using JBPM + SEAM + Hibernate in my web application. I created an ...

16. OneToOne Mapping using a common column -Book,ISBN,Inventory    forum.hibernate.org

I have a Book model and Inventory model mapped by ISBN number, but ISBN is not the primary key in either. Each table has its own surrogate primary key - the id column. Books belong to Bookstores and Inventory is for a group of Bookstores(BookstoreChain). Inventory is shared by all Bookstores belonging to a BookstoreChain. I'm using Hibernate @OneToOne mapping on ...