jpa-2.0

I have the following database model: A aId AB aId bId B bId status In a Spring data Specification, I want to return the instances of A when B.status is 'X'. The JPQL code is the following: select a from A a where a in (select ab.id.a from AB ab where ab.id.b.status= :status) These are the model classes: @Entity public class A { private Long aId; @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "id.a") private Set<AB> ab; } @Entity public class B { private Long bId; private String Status; @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "id.b")

I am designing a web-application that access many database tables. I am trying to figure out what is the preferred way to access those tables? Is it via JPA or EJB? Thanks, Nathan The answer is 'both'. EJB itself doesn't access any DB tables. Everything you do in Java that relates to the DB happens via the Java Persistence API (JPA), or if you want to do low level stuff via JDBC but let's not get into that here. What EJB brings to the table is a very easy management of transactions. You always need those with JPA, and it's a bit of pain to manage these manually. EJB also gives you very easy

I am using JpaSpecificationExecutor for creating custom queries. How do I create a Specification for the following SQL? select * from employee e, address a where e.id=23415 and e.name="Deepak" and a.city="Leeds"; Java Class : public static Specification<Employee> searchEmployee(final Map<String,String> myMap) { return new Specification<Employee>(){ @Override public Predicate toPredicate(Root<Employee> root, CriteriaQuery<?> query, CriteriaBuilder cb) { //Need to query two tables Employee and Address } } Here is a test that works @Test public void test1() { repository.save(makeEmployee("billy",

I'm using JPA 2.0. Hibernate 4.1.0.Final, and Java 6. How do I write a JPA query from the following psuedo-SQL? select max(e.dateProcessed) from Event e where e.org = myOrg And my domain object looks like the following: @GenericGenerator(name = "uuid-strategy", strategy = "org.mainco.subco.core.util.subcoUUIDGenerator") @Entity @Table(name = "sb__event", uniqueConstraints = { @UniqueConstraint(columnNames={"EVENT_ID"}) } ) public class Event { @Id @Column(name = "ID") @GeneratedValue(generator = "uuid-strategy") private String id; @ManyToOne(fetch = FetchType.LAZY, cascade = {CascadeType

I have this query: SELECT @rownum:=@rownum+1 'no', m.title, m.author, REPLACE(SUBSTRING_INDEX(m.content, ' ', 20), '<br>', ' '), m.viewed, m.hashid FROM book m, (SELECT @rownum:=0) r WHERE m.lang = ?1 AND m.title like CONCAT('%',?2,'%') ORDER BY m.title asc The @rownum:=@rownum+1 part of the MySQL query for result numbering as Primefaces currently does not have a facility to display a numbering column. Is there a way to show Primefaces column numbering without having to do @rownum:=@rownum+1 ? If not, can I construct the above query using purely the CriteriaBuilder method? I am not quite sure

I'm using inheritance with EJB in a few scenarios, sometimes with annotations in the super class like this generic entityDAO: public class JpaDAO<T>{ protected Class<T> entityClass; @PersistenceContext(unitName="CarrierPortalPU") protected EntityManager em; protected CriteriaBuilder cb; @PostConstruct private void init() { cb = em.getCriteriaBuilder(); } public JpaDAO(Class<T> type) { entityClass = type; } @TransactionAttribute(TransactionAttributeType.REQUIRED) public void create(T entity) { em.persist(entity); } @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) public T find