Update Named query in EJB

Question

Hi Experts,
I have created an EJB DC to interact with CE database using JPA's and named query. My read query is working fine and i can see the output in WS Navigator. For "Update" i have written a named query like :
@NamedQuery(name = "updatePos", query = "UPDATE StorePos p SET p.name= ?1 WHERE p.id= ?2 ")
To use this named query i have written a method in session bean which is
public int updateStorePos(String id, String name){
          Query update_query = em.createNamedQuery("updatePos");
          update_query.setParameter(1, name);
          update_query.setParameter(2, id);
          int updateData = update_query.executeUpdate();
          return updateData;
Now when i execute this method in web service updateData returns value 0,1,2 depending on the number of Id's found. That means I am able to update at JPA layer but when i again execute the read method it displays old value. I am assuming there is some problem with commit. Can some one suggest how to resolve this issue.
Regards
Pranav

Answer 1

Hi Adrian,
Thanks a lot for quick reply. That was indeed a very help full reply. But sorry for sounding ignorant, this is my first try on JPA's and named query. I am not able to figur out the exact problem by myself. Giving you brief on what i am doing is:
I have added a class in newly created EJB DC. This class holds my named queries and name of this class is StorePos.java
This is the code which i have generated
@Entity
@NamedQueries( {
     @NamedQuery(name = "findAllPos",
     query = "SELECT p FROM StorePos p"),
     @NamedQuery(name = "updatePos",
               query = "UPDATE StorePos p SET p.name= ?1 WHERE p.id= ?2 ")})
@Table(name="TMP_TEST")
public class StorePos implements Serializable {
     private static final long serialVersionUID = 1L;
     @Id
     private String id;
     private String name ;
      * @return the id
     public String getId() {
          return id;
      * @param id the id to set
     public void setId(String id) {
          this.id = id;
      * @return the name
     public String getName() {
          return name;
      * @param name the name to set
     public void setName(String name) {
          this.name = name;
Now i have created a session bean to access this class and to make the things available as WS. Name of the bean is StorePosSessionBean.java and code written in it is
@SuppressWarnings("unchecked")
@Stateless
@WebService
public class StorePosSessionBean implements StorePosSessionLocal {
     @PersistenceContext(unitName="POS")
     private EntityManager em;
     public List<StorePos> getStorePos() {
     List<StorePos> storePos = em.createNamedQuery("findAllPos").getResultList();
     return storePos;
     public int updateStorePos(String id, String name){
          Query update_query = em.createNamedQuery("updatePos");
          update_query.setParameter(1, name);
          update_query.setParameter(2, id);
          int updateData = update_query.executeUpdate();
          em.setFlushMode(FlushModeType.COMMIT);
//          em.close();
          return updateData;
i am following this article for reference. this is for reading data from table
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b030e7fb-2662-2b10-0dab-c4aa52c3550b?quicklink=index&overridelayout=true
Regards
Pranav