ejb3.0 one-one 保存的一些代码

package com.lr.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * Users generated by hbm2java
 */
@Entity
@Table(name = "users", catalog = "ejb3", uniqueConstraints = {})
public class Users implements java.io.Serializable {

 // Fields   

 private int id;

 private String name;

 private String pass;

 // Constructors

 /** default constructor */
 public Users() {
 }

 /** minimal constructor */
 public Users(int id) {
  this.id = id;
 }

 /** full constructor */
 public Users(int id, String name, String pass) {
  this.id = id;
  this.name = name;
  this.pass = pass;
 }

 // Property accessors
 @Id
 @Column(name = "id", unique = true, nullable = false, insertable = true, updatable = true)
 public int getId() {
  return this.id;
 }

 public void setId(int id) {
  this.id = id;
 }

 @Column(name = "name", unique = false, nullable = true, insertable = true, updatable = true, length = 20)
 public String getName() {
  return this.name;
 }

 public void setName(String name) {
  this.name = name;
 }

 @Column(name = "pass", unique = false, nullable = true, insertable = true, updatable = true, length = 20)
 public String getPass() {
  return this.pass;
 }

 public void setPass(String pass) {
  this.pass = pass;
 }

}

package com.lr.entity;

// Generated 2006-8-28 16:22:58 by Hibernate Tools 3.1.0.beta5

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Home object for domain model class Users.
 * @see com.lr.entity.Users
 * @author Hibernate Tools
 */
@Stateless
public class UsersHome {

 private static final Log log = LogFactory.getLog(UsersHome.class);

 @PersistenceContext
 private EntityManager entityManager;

 public void persist(Users transientInstance) {
  log.debug("persisting Users instance");
  try {
   entityManager.persist(transientInstance);
   log.debug("persist successful");
  } catch (RuntimeException re) {
   log.error("persist failed", re);
   throw re;
  }
 }

 public void remove(Users persistentInstance) {
  log.debug("removing Users instance");
  try {
   entityManager.remove(persistentInstance);
   log.debug("remove successful");
  } catch (RuntimeException re) {
   log.error("remove failed", re);
   throw re;
  }
 }

 public Users merge(Users detachedInstance) {
  log.debug("merging Users instance");
  try {
   Users result = entityManager.merge(detachedInstance);
   log.debug("merge successful");
   return result;
  } catch (RuntimeException re) {
   log.error("merge failed", re);
   throw re;
  }
 }

 public Users findById(int id) {
  log.debug("getting Users instance with id: " + id);
  try {
   Users instance = entityManager.find(Users.class, id);
   log.debug("get successful");
   return instance;
  } catch (RuntimeException re) {
   log.error("get failed", re);
   throw re;
  }
 }
}

package com.lr.stateless;

import javax.ejb.Remote;
import javax.ejb.Stateless;
import com.lr.UsersDAO;
import com.lr.entity.Users;
import javax.persistence.*;
import java.util.*;
@Stateless
@Remote({UsersDAO.class})
public class UsersDAOBean implements com.lr.UsersDAO {
 @PersistenceContext
 public EntityManager em;
     public String Find(String id){
      //通过主键查找
      Users user=em.find(Users.class,Integer.valueOf(id));
      return user.getPass()+user.getName();
     }
     public void ShowUser(){
      //显示所有信息
      String ejb3ql="select u from users";
      Query query=em.createQuery(ejb3ql);
      List result=query.getResultList();
      Iterator iterator=result.iterator();
      if(result!=null){
       while(iterator.hasNext()){
        Users user=(Users)iterator.next();
        user.getId();
        user.getPass();
     user.getName();
       }
      }
     }
     public boolean DelUser(String id){
      //删除
      try{
      Users user=em.find(Users.class,Integer.valueOf(id));
      em.remove(user);
      }catch(Exception e){
       e.printStackTrace();
       return false;
      }
      return true;
     }
     public boolean insertUser(String name,String pass){
      //插入
      try{
       Users user=new Users();
       user.setName(name);
       user.setPass(pass);
       em.persist(user);
      }catch(Exception e){
       e.printStackTrace();
       return false;
      }
      return true;
     }
     public boolean ChangeUser(String name,String pass){
      //修改
      try{
       String ejb3ql="update Users as u set u.name='"+name+"',user.pass='"+pass+"'";
       Query query=em.createQuery(ejb3ql);
       query.executeUpdate();
      }catch(Exception e){
       e.printStackTrace();
       return false;
      }
      return true;
     }
}

package com.lr;
public interface UsersDAO{
 public String Find(String name);
 public void ShowUser();
 public boolean DelUser(String id);
 public boolean insertUser(String name,String pass);
 public boolean ChangeUser(String name,String pass);
}

<persistence>
  <persistence-unit name="Users">
    <jta-data-source>java:/mysql1</jta-data-source>
    <properties>
      <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
    </properties>
  </persistence-unit>
</persistence>

<?xml version="1.0" encoding="UTF-8" ?>
 
 <datasources>
 <local-tx-datasource>
  <jndi-name>mysql1</jndi-name>
  <connection-url>jdbc:mysql://localhost:3306/ejb3</connection-url>
  <driver-class>org.gjt.mm.mysql.Driver</driver-class>
  <user-name>root</user-name>
  <password>123456</password>
  <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name>
 <metadata>
  <type-mapping>mySQL</type-mapping>
  </metadata>
  </local-tx-datasource>
  </datasources>