@SuppressWarnings("serial")
@Entity
@Table(name="DictionaryCatalog")
public class DictionaryCatalogEntity implements Serializable {
 private Integer catalogId;
 private String catalogName;
 private String cataMemo;
 private DictionaryTypeEntity dte;
 private Set<DirectoryData> dce;
 
 @ManyToOne(cascade=CascadeType.ALL ,fetch=FetchType.LAZY,optional=false)
 @JoinColumn(name="id")
 public DictionaryTypeEntity getDte() {
  return dte;
 }
 public void setDte(DictionaryTypeEntity dte) {
  this.dte = dte;
 }
 @OneToMany(cascade=CascadeType.ALL ,fetch=FetchType.LAZY,mappedBy="dataId")
 @OrderBy(value="dataId desc")
 public Set<DirectoryData> getDce() {
  return dce;
 }
 
 public void setDce(Set<DirectoryData> dce) {
  this.dce = dce;
 }
 @Id
 @GeneratedValue
 public Integer getCatalogId() {
  return catalogId;
 }
 public void setCatalogId(Integer catalogId) {
  this.catalogId = catalogId;
 }
 
 @Column(name="catalogName" , nullable=true ,length=50)
 public String getCatalogName() {
  return catalogName;
 }
 public void setCatalogName(String catalogName) {
  this.catalogName = catalogName;
 }
 @Column(name="cataMemo" ,nullable=true ,length=50)
 public String getCataMemo() {
  return cataMemo;
 }
 public void setCataMemo(String cataMemo) {
  this.cataMemo = cataMemo;
 }

}

呵呵连数据库都自己生成了,你门说酷不

完了是会话BEAN

@Stateless
@Remote ({QueryDAO.class})
public class QueryDAOBean implements QueryDAO {
    @PersistenceContext
    protected EntityManager em;

    public void initdate() {
            Query query = em.createQuery("select count(p) from Person p");
            Object result = query.getSingleResult();
            if (result == null || Integer.parseInt(result.toString()) == {          

}
查询基本是上是写完了,看是不是很类似HIBERNATE的查询语言呵呵,但是EJB又封装了哈，现在EJB终于可以和SPRING想抗衡了哦,呵呵)

(此例子3个类没有任何关系,所以大家看看如何写就好咯,呵呵.后面我会写个例子让大家参考的)