JavaEE5学习笔记08-JPA与EJB集成总结(2)

下面来看针对此实体操作的sessionBean代码。

接口

package jpa.eao;    @Remote public interface IPersonEAO {       public void save(Person entity);     public void delete(Person entity);     public Person update(Person entity);     public Person findById(Integer id);     public List<Person> findByProperty(String propertyName, Object value);     public List<Person> findByName(Object name);     public List<Person> findAll(); }

实现类

@Stateless @TransactionManagement(TransactionManagementType.CONTAINER) @TransactionAttribute(TransactionAttributeType.REQUIRED) public class PersonEAO implements IPersonEAO {     // property constants     public static final String NAME = "name";         /**      * 容器资源注入的实体操作管理器      */     @PersistenceContext(unitName = "JavaEE4JbossPU")     private EntityManager entityManager;         /**      * 增加记录      */     public void save(Person entity) {        try {            entityManager.persist(entity);        } catch (RuntimeException re) {            throw re;        }     }         /**      * 删除记录      */     public void delete(Person entity) {        try {            entity = entityManager.getReference(Person.class, entity.getId());            entityManager.remove(entity);        } catch (RuntimeException re) {            throw re;        }     }         /**      * 更新记录      */     public Person update(Person entity) {        try {            Person result = entityManager.merge(entity);            return result;        } catch (RuntimeException re) {            throw re;        }     }         /**      * 查询单独实体记录      */     public Person findById(Integer id) {        try {            Person instance = entityManager.find(Person.class, id);            return instance;        } catch (RuntimeException re) {            throw re;        }     }         /**      * 按属性查找实体集合      */     @SuppressWarnings("unchecked")     public List<Person> findByProperty(String propertyName, final Object value) {        try {            final String queryString = "select model from Person model where model."                   + propertyName + "= :propertyValue";            Query query = entityManager.createQuery(queryString);            query.setParameter("propertyValue", value);            return query.getResultList();        } catch (RuntimeException re) {            throw re;        }     }         /**      * 按name查找实体集合      */     public List<Person> findByName(Object name) {        return findByProperty(NAME, name);     }         /**      * 查询所有的实体记录      */     @SuppressWarnings("unchecked")     public List<Person> findAll() {        try {            final String queryString = "select model from Person model";            Query query = entityManager.createQuery(queryString);            return query.getResultList();        } catch (RuntimeException re) {            throw re;        }     } }

这个就是一个一般的会话Bean，里面是容器注入了实体管理器EntityManager，通过实体管理器对实体进行增删改查操作。