jpa-2.0

Scenario : I have 3 tables, Offer, Channel and Offer_Channels. Basically Channel is a lookup table, i.e, the values in that table can neither be inserted nor updated by the application. An offer can contain one or many channels. I use the Channel table values to populate dynamic checkboxes. Anyways, so here is what I have : @Entity @Table(name = "OFFER") @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) public class Offer implements Serializable { // Offer Id @Id @GeneratedValue(strategy = GenerationType.AUTO, generator = "offer_seq_gen") @Column(name = "OFFER_ID") private long

I'm using JPQL to retrieve data. I can get data using the statement List persons = null; persons = em.createQuery("select p.albumName from PhotoAlbum p , Roleuser r where r = p.userId and r.userID = 1"); Now I can get the album names using this: int i=0; for (i=0;i<persons.size(); i++) { System.out.println("Testing n "+ i +" " + persons.get(0)); } Now I want to get the album name and the roleuser's row named firstname I'm using the query persons = em.createQuery("select r.firstName , p.albumName from PhotoAlbum p , Roleuser r where r = p.userId and r.userID = 1").getResultList(); Now how do I

I'm in a situation where I need to determine the EntityManager's unit name at run time. For example, I'd like to do something like this: @PersistenceContext(unitName = findAppropriateJdbcName()) EntityManager entityManager; However, this is not possible with annotations. Is it possible to create the EntityManager when your not sure of what the unit name is until run time? Jim Tough It is possible to specify the persistence unit (PU) name at runtime, but this is a parameter used in the creation of the EntityManagerFactory , not an individual EntityManager . See the Javadoc for the Persistence

I am using JPA 2.0 and SQL Server 2008 and I have determined that JPA doesn't like my stored procedures when I use a table variable. For example, this sproc works: declare @t table ( id int identity , test varchar(50) ) select 'blah' as test -- I'm ignoring the table variable above However, when I try to insert something into the table variable @t with this code, it crashes: declare @t table ( id int identity , test varchar(50) ) insert into @t select cast(getdate() as varchar(60)) select * from @t I get the following error: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.0.2

suppose i have the following entity domain: @Entity @Inheritance(strategy=InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name="TYPE") public abstract class Entity1 { //some attributes } @Entity @DiscriminatorValue("T1") public class Entity2 extends Entity1 { @OneToMany(fetch=FetchType.EAGER, cascade = { CascadeType.ALL }, mappedBy="parent") @Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN) private Set<Entity1Detail> details = new HashSet<Entity1Detail>(); } @Entity public class Entity1Detail { @ManyToOne @JoinColumn(name="REF") private Entity2 parent; @Basic private Integer

I am developing a simple webapp which exposes the domain model as RESTful resources. I am planning to use JPA2(Hibernate) with SpringMVC REST support. While marshalling Hibernate entities into XML/JSON, if the entity is detached it will throw LazyLoadingException for lazy child associations. If the entity is still attached to Hibernate Session it will almost load whole database. I have tried using Dozer CustomFieldMapper to determine if the property is lazy Hibernate Collection which is not loaded then return NULL. But if we have bi-directional associations Hibernate eagerly load Many-to- One

I'd like to map datatypes from PostGIS with JPA 2.0. I googled for solutions or examples, but all I can find is that JPA does not support mapping of custom data types. Is it still like this in JPA 2.0? Has anybody a hint for an example? I googled for solutions or examples, but all I can find is, that JPA does not support mapping of custom data types. Is it still in JPA 2.0? Yes. So you'll have to rely on specific extensions. For Hibernate, the Hibernate Spatial project provides ready to use spatial dialects and custom types: Hibernate Spatial is a generic extension to Hibernate for handling