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1   /*
2    * JBoss, Home of Professional Open Source
3    * Copyright 2014, Red Hat, Inc. and/or its affiliates, and individual
4    * contributors by the @authors tag. See the copyright.txt in the
5    * distribution for a full listing of individual contributors.
6    *
7    * Licensed under the Apache License, Version 2.0 (the "License");
8    * you may not use this file except in compliance with the License.
9    * You may obtain a copy of the License at
10   * http://www.apache.org/licenses/LICENSE-2.0
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.jboss.as.quickstarts.greeter.domain;
18  
19  import javax.ejb.Stateful;
20  import javax.enterprise.inject.Alternative;
21  import javax.inject.Inject;
22  import javax.persistence.EntityManager;
23  import javax.persistence.NoResultException;
24  import javax.persistence.Query;
25  
26  @Stateful
27  @Alternative
28  public class EJBUserDao implements UserDao {
29  
30      @Inject
31      private EntityManager entityManager;
32  
33      public User getForUsername(String username) {
34          try {
35              Query query = entityManager.createQuery("select u from User u where u.username = ?");
36              query.setParameter(1, username);
37              return (User) query.getSingleResult();
38          } catch (NoResultException e) {
39              return null;
40          }
41      }
42  
43      public void createUser(User user) {
44          entityManager.persist(user);
45      }
46  
47  }