Question

I’am tring to retrieve from my database (using JPA) for a given list of items name their id,
my function wich called by my addFunction return just the id of the last item and ignore the rest!

public ArrayList<Integer> getListidItemByItemName()
  {
       try{
       EntityTransaction entityTrans=emm.getTransaction();
       entityTrans.begin();
          for (String val : listItem)  
          {
           System.out.println("my values"+val);
           javax.persistence.Query multipleSelect= em.createQuery("SELECT i.ItemId FROM Item i WHERE i.ItemName IN (:w)" );
           multipleSelect.setParameter("w", val);
           List ItemId =  new LinkedList();
           ItemId= multipleSelect.getResultList();
           listIdItem = new ArrayList(ItemId);
          }    
          entityTrans.commit();
          System.out.println("Id for given item name"+listIdItem);
          return listIdItem;
         }

         catch(Exception e)
        {
           e.printStackTrace();
        }

The result :

INFO: my valuesResponse Time
INFO: my valuesAssigned Group Response Time
INFO: Id for given item name[7]  //the id of the last item in the list

      return listIdItem;
  }

Where is the problem?

UPDATE:
I have use the solution of mat and it worked fine

thank you

Answer 1

listIdItem = new ArrayList(ItemId);

This line replaces whatever you had in listIdItem with a new list. If you want to add to the listIdItem list, do something like:

listIdItem.addAll(ItemId);