operationservicebean.java

来自「EJB3 Annotation Sample」· Java 代码 · 共 58 行

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package com.s7turn.security.session;

import com.s7turn.security.entity.Operation;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

/**
 *
 * @author Long
 */
@Stateless
public class OperationServiceBean implements OperationServiceLocal {

    @PersistenceContext(unitName="s7turn-pu")
    private EntityManager em;
    
    public void save(Operation t) {
        if( t.getId() == null || new Long(0).equals( t.getId() )  )
        {
            em.persist(t);
        }
        else{
            em.merge(t);
        }
        
    }

    public void remove(Operation t) {
        em.remove( em.merge(t));
    }

    public Operation findById(Long id) {
        Query q = em.createNamedQuery("Operation.findOperationById");
        q.setParameter("id", id);
        try{
            return (Operation) q.getSingleResult();
        }catch(NoResultException nre){
            return null;
        }
    }

    public List<Operation> getAllItems() {
        Query q = em.createNamedQuery("Operation.findAllItems");
        return q.getResultList();
    }
    
 
}